CN104484697A - Charging and bi-direction identifying method of passive visible light label and reader-writer - Google Patents

Abstract

Translated fromChinese

本发明公开了一种无源可见光标签及读写器的充电和双向识别方法。设置装置包括VL标签和读写器，两者采用可见光通信的半双工和全双工方式通信。读写器由读写控制、解调解码、判决、调制编码、驱动、电能发送、通信、光电接收器、光发射器、送电线圈、电源等功能模块组成。VL标签包括标签主控制、解调解码、判决、调制编码、驱动、电能接收、光电接收器、光发射器和受电线圈。VL标签为无源标签，通过无线电磁供电方式从读写器获得电能，通过相互认证建立通信链路。本发明采用可见光通信和无线供电技术实现，不受电磁场干扰，无电磁干扰，安全性好，有照明功能，读写更方便；VL标签结构功能简单，能用于小微型、便携设备的实现方案。

The invention discloses a charging and two-way identification method for a passive visible light tag and a reader-writer. The setting device includes a VL tag and a reader-writer, both of which communicate in the half-duplex and full-duplex modes of visible light communication. The reader is composed of functional modules such as read and write control, demodulation and decoding, judgment, modulation and coding, drive, power transmission, communication, photoelectric receiver, light transmitter, power transmission coil, and power supply. VL tags include tag main control, demodulation and decoding, judgment, modulation and coding, driving, power receiving, photoelectric receiver, optical transmitter and receiving coil. The VL tag is a passive tag, which obtains power from the reader through wireless electromagnetic power supply, and establishes a communication link through mutual authentication. The invention adopts the technology of visible light communication and wireless power supply, is free from electromagnetic field interference, has no electromagnetic interference, has good safety, has lighting function, and is more convenient to read and write; the VL tag has a simple structure and function, and can be used in the realization scheme of small, micro and portable devices .

Description

Translated fromChinese

无源可见光标签及读写器的充电和双向识别方法Charging and two-way identification method of passive visible light tag and reader

技术领域technical field

本发明属于可见光通信技术领域，特别涉及一种无源可见光标签及读写器的充电和双向识别方法。The invention belongs to the technical field of visible light communication, and in particular relates to a passive visible light tag and a charging and bidirectional identification method for a reader-writer.

背景技术Background technique

可见光通信（Visible Light Communication，简称VLC）技术，就是在发送端利用LED等发光设备发出带有信息的调制可见光信号，接收端利用感光设备接收调制可见光信号以实现无线通信的方法。该技术是近些年被发现的新的无线通信技术，被发展用于补充甚至替代目前其他的手段，如：无线电、红外或激光通信等技术，以解决这些技术的不足。可见光通信不同于无线电、红外或激光等光通信方式：无线电、红外光看不到，信号的发射方向不够明确，因此有很大的不安全性；激光方向性强，不大适合自由的开放性的通信，同时激光功耗大，不大适宜低功耗便携式设备。此外，无线电还会产生电磁辐射、干扰等不良影响。Visible light communication (Visible Light Communication, referred to as VLC) technology is to use light-emitting devices such as LEDs at the sending end to send out modulated visible light signals with information, and the receiving end uses photosensitive devices to receive modulated visible light signals to achieve wireless communication. This technology is a new wireless communication technology discovered in recent years. It is developed to supplement or even replace other current means, such as radio, infrared or laser communication technologies, to solve the shortcomings of these technologies. Visible light communication is different from optical communication methods such as radio, infrared or laser: radio and infrared light cannot be seen, and the direction of signal emission is not clear enough, so there is great insecurity; laser has strong directionality and is not suitable for freedom and openness At the same time, the laser consumes a lot of power, which is not suitable for low-power portable devices. In addition, radio will also produce adverse effects such as electromagnetic radiation and interference.

无线充电源于无线电力输送技术。无线充电，又称作感应充电、非接触式感应充电，是利用近场感应，即电磁耦合，由供电设备将能量传送至用电设备，该用电设备使用接收到的能量对电池充电或为用电设备供电。Wireless charging stems from wireless power transfer technology. Wireless charging, also known as inductive charging and non-contact inductive charging, uses near-field induction, that is, electromagnetic coupling, to transmit energy from the power supply device to the power-consuming device, and the power-consuming device uses the received energy to charge the battery or provide Powering electrical equipment.

本发明就是联合运用了可见光通信、无线供电等技术，提供了一种可见光双向识别无源标签及读写器的实现方法，解决了可见光通信设备向轻便、小微型化发展的重要问题，让其可以像磁卡、各种轻薄的无源RFID一样广泛普及应用。The present invention combines visible light communication, wireless power supply and other technologies to provide a method for implementing visible light two-way identification of passive tags and readers, which solves the important problem of the development of visible light communication equipment towards portability, miniaturization, and makes it It can be widely used like magnetic cards and various thin passive RFIDs.

发明内容Contents of the invention

本发明的目的是提供一种无源可见光标签及读写器的充电和双向识别方法。The purpose of the present invention is to provide a charging and two-way identification method for a passive visible light tag and a reader-writer.

具体步骤为：The specific steps are:

（一）设置一种无源可见光标签及读写器装置，装置包括VL标签、读写器，读写器由读写控制模块、读写解调解码模块、读写判决模块、读写调制编码模块、读写驱动模块、电能发送模块、通信模块、读写光电接收器、读写光发射器、送电线圈、电源模块组成；VL标签由标签控制模块、标签解调解码模块、标签判决模块、标签调制编码模块、标签驱动模块、电能接收模块、标签光电接收器、标签光发射器、受电线圈组成；读写控制模块连接读写解调解码模块、读写调制编码模块、电能发送模块、通信模块、电源模块，电源模块连接读写解调解码模块、读写判决模块、读写调制编码模块、读写驱动模块、电能发送模块、通信模块，读写判决模块连接读写光电接收器、读写解调解码模块，读写驱动模块连接读写光发射器、读写调制编码模块，电能发送模块连接送电线圈；标签控制模块连接标签解调解码模块、标签调制编码模块、电能接收模块，电能接收模块连接标签解调解码模块、标签判决模块、标签调制编码模块、标签驱动模块、电能接收模块、标签光电接收器、标签光发射器、受电线圈，标签判决模块连接标签光电接收器、标签解调解码模块，标签驱动模块连接标签光发射器、标签调制编码模块；读写光发射器通过读写可见光信息与标签光电接收器相对应，标签光发射器通过应答可见光信息与读写光电接收器相对应，读写器的送电线圈通过无线电磁能量与VL标签的受电线圈相对应。(1) Set up a passive visible light tag and a reader/writer device, the device includes a VL tag and a reader/writer, and the reader/writer consists of a read/write control module, a read/write demodulation/decoding module, a read/write judgment module, and a read/write modulation code Module, read-write drive module, power transmission module, communication module, read-write photoelectric receiver, read-write optical transmitter, power transmission coil, power module; VL tag consists of tag control module, tag demodulation and decoding module, tag judgment module , tag modulation and encoding module, tag driver module, power receiving module, tag photoelectric receiver, tag optical transmitter, and power receiving coil; the read-write control module is connected to the read-write demodulation and decoding module, read-write modulation and encoding module, and power transmission module , communication module, power module, the power module is connected to read-write demodulation and decoding module, read-write judgment module, read-write modulation and coding module, read-write drive module, power transmission module, communication module, read-write judgment module is connected to read-write photoelectric receiver , Read-write demodulation and decoding module, read-write drive module is connected to read-write optical transmitter, read-write modulation and encoding module, power transmission module is connected to power transmission coil; label control module is connected to label demodulation and decoding module, label modulation and encoding module, power receiving Module, the power receiving module is connected to the tag demodulation and decoding module, tag judgment module, tag modulation and encoding module, tag driver module, power receiving module, tag photoelectric receiver, tag optical transmitter, power receiving coil, and the tag judgment module is connected to the tag photoelectric receiver The tag demodulation and decoding module, the tag driver module are connected to the tag optical transmitter and the tag modulation and encoding module; the read-write optical transmitter corresponds to the tag photoelectric receiver by reading and writing visible light information, and the tag optical transmitter responds to the visible light information and Corresponding to the photoelectric receiver, the power transmission coil of the reader corresponds to the power receiving coil of the VL tag through wireless electromagnetic energy.

所述读写器用于利用可见光通信的方式，向VL标签发送读写可见光信息，并接收来自VL标签的应答可见光信息，以实现与VL标签之间的数据读出或写入操作，分析、处理、验证、存储接收到VL标签的信息，与外部设备进行数据通信，并给VL标签提供电能。The reader is used to send and read visible light information to the VL tag by means of visible light communication, and receive the response visible light information from the VL tag, so as to realize the data read or write operation with the VL tag, analyze and process , verify and store the information received from the VL tag, perform data communication with external devices, and provide power to the VL tag.

所述电源模块为读写器的各功能模块提供电能。The power supply module provides electric energy for each functional module of the reader.

所述读写控制模块用于对读写器的各模块进行功能控制，读写、存储数据，分析处理，验证接收到的VL标签信息，由通信模块与外部设备进行数据交换。The read-write control module is used for functional control of each module of the reader-writer, read-write, store data, analyze and process, verify received VL label information, and exchange data with external devices by the communication module.

所述读写光电接收器用于感应来自VL标签的应答可见光信息，并转换成相应的电信号。The read-write photoelectric receiver is used to sense the response visible light information from the VL tag and convert it into a corresponding electrical signal.

所述读写判决模块用于读写接收来自读写光电接收器转换后的电信号，转换成数字信号。The read-write judgment module is used for reading and writing to receive the converted electrical signal from the read-write photoelectric receiver and convert it into a digital signal.

所述读写解调解码模块用于对读写判决模块输出的数字信号，进行解调、解码。The read-write demodulation and decoding module is used to demodulate and decode the digital signal output by the read-write judgment module.

所述读写调制编码模块对读写控制模块发送来的数据信号进行编码，并调制成适合无线光信道传输的信号。The read-write modulation and encoding module encodes the data signal sent by the read-write control module, and modulates it into a signal suitable for wireless optical channel transmission.

所述读写驱动模块用于根据读写调制编码模块发送来的信号，驱动读写光发射器发送读写可见光信息。The read-write drive module is used to drive the read-write light transmitter to send read-write visible light information according to the signal sent by the read-write modulation and encoding module.

所述通信模块用于与外部设备建立通信，向外部设备发送数据，接收外部设备的数据，实现数据交互、机构控制。The communication module is used to establish communication with external equipment, send data to external equipment, receive data from external equipment, and realize data interaction and mechanism control.

所述读写光发射器用于在读写驱动模块的作用下，发送读写可见光信息。The read-write light transmitter is used for sending read-write visible light information under the action of the read-write drive module.

所述电能发送模块用于产生适用于无线电能传输的电能信号。The power sending module is used for generating power signals suitable for wireless power transmission.

所述送电线圈用于将电能发送模块产生的电能信号，发送出去，形成充电电磁场。The power sending coil is used to send out the power signal generated by the power sending module to form a charging electromagnetic field.

所述VL标签靠从读写器获得的无线电能供电而上电工作，以可见光通信的方式，向读写器发送应答可见光信息，接收来自读写器的读写可见光信息，以实现与读写器之间的信息读出或写入操作，分析、验证、存储、处理接收到读写器的信息。The VL tag is powered on by the wireless power obtained from the reader, and sends a response visible light information to the reader in the form of visible light communication, and receives the read and write visible light information from the reader to realize the read and write. Read or write information between readers, analyze, verify, store, and process information received by the reader.

所述标签控制模块用于对VL标签的各模块进行功能控制，读写、存储数据，分析处理接收到的读写器数据信息。The tag control module is used to control the functions of each module of the VL tag, read, write and store data, and analyze and process the received data information of the reader/writer.

所述受电线圈用于感应接收来自送电线圈的无线电磁能，并用电能接受模块收集。The power receiving coil is used for inductively receiving wireless electromagnetic energy from the power transmitting coil, and is collected by the power receiving module.

所述电能接收模块用于收集受电线圈感应到的无线电磁能，用于为标签各模块供给电能。The power receiving module is used to collect wireless electromagnetic energy induced by the power receiving coil, and is used to supply power to each module of the tag.

所述标签调制编码模块对标签控制模块发送来的各种信息进行编码，并调制成适合无线光信道传输的信号。The label modulation and encoding module encodes various information sent by the label control module, and modulates them into signals suitable for wireless optical channel transmission.

所述标签驱动模块用于根据标签调制编码模块发送来的信号，驱动标签光发射器发送应答可见光信息。The label driving module is used to drive the label light transmitter to send response visible light information according to the signal sent by the label modulation and encoding module.

所述标签光发射器用于发送应答可见光信息。The tag light transmitter is used to send and reply visible light information.

所述标签光电接收器用于接收来自读写器发送的读写可见光信息，并转换成相应的电信号。The photoelectric receiver of the tag is used to receive the read-write visible light information sent from the reader-writer and convert it into a corresponding electrical signal.

所述标签判决模块用于将标签光电接收器发送来的电信号，转换成数字信号。The tag decision module is used to convert the electrical signal sent by the photoelectric receiver of the tag into a digital signal.

所述标签解调解码模块用于对标签判决模块输出的数字信号，进行解调，并解码。The label demodulation and decoding module is used to demodulate and decode the digital signal output by the label decision module.

（二）所述的无源可见光标签及读写器装置的供电和启动方式，步骤如下：(2) The power supply and start-up method of the passive visible light tag and the reader device are as follows:

P1、读写器上电后进入待机状态，待机状态下电源模块只向电能发送模块和送电线圈供电，电能发送模块和送电线圈处于空载状态，形成可以对外提供无线电磁能量的读写器工作区域。P1. After the reader is powered on, it enters the standby state. In the standby state, the power module only supplies power to the power transmission module and the power transmission coil. The power transmission module and the power transmission coil are in an empty state, forming a read-write that can provide wireless electromagnetic energy to the outside world. device work area.

P2、VL标签在远离读写器的工作区域时，处于无源的状态，不工作，当VL标签进入读写器的工作区域后，获得无线电磁能量上电工作，同时受电线圈会对送电线圈产生一个感应电磁场，该感应电磁场与送电线圈产生的互感效应会引起受电线圈和送电线圈之间的电磁场的电磁参数变化。P2. When the VL tag is far away from the working area of the reader, it is in a passive state and does not work. When the VL tag enters the working area of the reader, it obtains wireless electromagnetic energy to power on and work, and at the same time the receiving coil will send The electric coil generates an induced electromagnetic field, and the mutual inductance effect between the induced electromagnetic field and the power transmitting coil will cause the change of the electromagnetic parameter of the electromagnetic field between the power receiving coil and the power transmitting coil.

P3、电能发送模块和送电线圈感测到由互感效应引起的电磁参数的变化后，电能发送模块就向电源模块发出启动信号，电源模块向读写器的其他功能模块提供电能，读写器各模块都上电进入正常工作状态，就可以与VL标签进行通信。P3. After the power transmission module and the power transmission coil sense the change of electromagnetic parameters caused by the mutual inductance effect, the power transmission module sends a start signal to the power module, and the power module provides power to other functional modules of the reader. Each module is powered on and enters the normal working state, then it can communicate with the VL tag.

（三）所述的VL标签与读写器的通信模式，有半双工和全双工两种方式，在双工通信方式下，在读写器到VL标签的下行通信信道和VL标签到读写器的上行通信信道，分别采用两组不同波段的带通滤镜，使得上行通信信道选用的可见光波段与下行通信信道选用的可见光波段没有重叠，保证两个信道不会相互干扰。(3) The communication mode between the VL tag and the reader has two modes of half-duplex and full-duplex. In the duplex communication mode, the downlink communication channel from the reader to the VL tag and the The uplink communication channel of the reader adopts two sets of band-pass filters of different bands, so that the visible light band selected for the uplink communication channel does not overlap with the visible light band selected for the downlink communication channel, ensuring that the two channels will not interfere with each other.

（四）所述的VL标签进入到读写器工作区域，获得电能，VL标签和读写器各模块都上电工作后，两者的通信分为两个过程：(4) The VL tag enters the working area of the reader to obtain power. After the VL tag and the modules of the reader are powered on and working, the communication between the two is divided into two processes:

1）VL标签向读写器发送应答可见光信息，读写器接收来自VL标签的应答可见光信息。1) The VL tag sends the response visible light information to the reader, and the reader receives the response visible light information from the VL tag.

在VL标签端：S1、VL标签控制模块将待发送信息输入至标签调制编码模块；S2、标签调制编码模块对VL标签控制模块输出的信息，进行调制、编码后，并输出到标签驱动模块；S3、标签驱动模块根据经过调制编码的信息，驱动标签光发射器发出应答可见光信息。At the VL label side: S1, the VL label control module inputs the information to be sent to the label modulation and encoding module; S2, the label modulation and encoding module modulates and encodes the information output by the VL label control module, and outputs it to the label driver module; S3. The tag driving module drives the tag light transmitter to send out response visible light information according to the modulated and coded information.

在读写器端：R1、读写光电接收器接收来自标签光发射器发来的应答可见光信息，并转换成相应的电信号；R2、再由读写判决模块将读写光电接收器转换的模拟电信号，转换成相应的数字信号，并输出到读写解调解码模块；R3、读写解调解码模块将数字信号进行解调解码，转换成原始的信息并输出至读写控制模块；R4、读写控制模块对读写解调解码模块输出的信息，进行分析处理。On the reader side: R1, the read-write photoelectric receiver receives the response visible light information from the tag light transmitter, and converts it into a corresponding electrical signal; R2, and then the read-write judgment module converts the read-write photoelectric receiver The analog electrical signal is converted into a corresponding digital signal and output to the read-write demodulation and decoding module; R3, the read-write demodulation and decoding module demodulates and decodes the digital signal, converts it into original information and outputs it to the read-write control module; R4. The read-write control module analyzes and processes the information output by the read-write demodulation and decoding module.

2）读写器向VL标签发送读写可见光信息，VL标签接收来自读写器的读写可见光信息。2) The reader sends read and write visible light information to the VL tag, and the VL tag receives the read and write visible light information from the reader.

在读写器端：S1、读写控制模块将待发送信息输入至读写调制编码模块；S2、读写调制编码模块对读写控制模块输出的信息进行调制编码，并输出到读写驱动模块；S3、读写驱动模块根据经过调制编码的信息，驱动读写光发射器发出读写可见光信息。At the reader-writer side: S1, the read-write control module inputs the information to be sent to the read-write modulation and encoding module; S2, the read-write modulation and encoding module modulates and encodes the information output by the read-write control module, and outputs it to the read-write drive module ; S3. The read-write drive module drives the read-write light transmitter to send read-write visible light information according to the modulated and coded information.

在VL标签端：R1、标签光电接收器接收来自读写光发射器发来的读写可见光信息，并转换相应的模拟电信号；R2、再由标签判决模块将标签光电接收器转换的模拟电信号，转换成相应的数字信号，并输出到标签解调解码模块；R3、标签解调解码模块将数字信号进行解调解码，转换成原始的信息并输出至读写控制模块；R4、VL标签控制模块对标签解调解码模块输出的信息，进行分析处理。At the VL tag end: R1, the tag photoelectric receiver receives the read-write visible light information from the read-write optical transmitter, and converts the corresponding analog electrical signal; R2, the tag judgment module converts the analog electrical signal converted by the tag photoelectric receiver The signal is converted into a corresponding digital signal and output to the tag demodulation and decoding module; R3, the tag demodulation and decoding module demodulates and decodes the digital signal, converts it into original information and outputs it to the read-write control module; R4, VL tag The control module analyzes and processes the information output by the tag demodulation and decoding module.

（五）所述的VL标签与读写器各模块上电正常工作后，读写器和VL标签进行数据交换前，要通过双向的身份认证方式建立通信链路，步骤为：(5) After the VL tag and the modules of the reader are powered on and working normally, before the reader and the VL tag exchange data, a communication link must be established through two-way identity authentication. The steps are:

L1：VL标签向读写器发送一个数据RB。L1: The VL tag sends a data RB to the reader.

L2：读写器收到数据RB后，读写器采用内部存放的认证数据MR和算法FunM(x)，对数据RB进行处理后得到RB1，RB1和读写器的一个数据RA组成ANS AB，并向VL标签发送一个应答数据ANS AB。L2: After the reader receives the data RB, the reader uses the internally stored authentication data MR and the algorithm FunM(x), processes the data RB to obtain RB1, RB1 and a data RA of the reader form ANS AB, And send a response data ANS AB to the VL tag.

L3：VL标签收到ANS AB 后，从ANS AB中提取出RB1，用VL标签中的认证数据MK和算法DFunM(x)，对ANS AB中的RB1部分进行解算得到RB2，并校验由L1的VL标签发出的数据RB与步骤L3中VL标签接收到的ANS AB解算中的RB2，是否一致，即：RB是否等于RB2。若读写器认证数据MR和算法FunM(x)与VL标签中的认证数据MK和算法DFunM(x)，相匹配，将会有RB=RB2，即校验正确，进入L4；否则将无法通过校验，中止建立链接。L3: After the VL label receives ANS AB, it extracts RB1 from ANS AB, uses the authentication data MK in the VL label and the algorithm DFunM(x), solves the RB1 part in ANS AB to obtain RB2, and verifies it by Whether the data RB sent by the VL tag of L1 is consistent with the RB2 in the ANS AB solution received by the VL tag in step L3, that is, whether RB is equal to RB2. If the authentication data MR and algorithm FunM(x) of the reader match with the authentication data MK and algorithm DFunM(x) in the VL label, there will be RB=RB2, that is, the verification is correct and enter L4; otherwise, it will fail Verify, abort establishing a connection.

L4：如果L3中RB=RB2的校验正确，则VL标签用内部存放的数据MK和算法DFunM(x)对RA进行运算处理后得到RA1，并用RA1生成应答数据ANS BA，再发送ANS BA给读写器。L4: If the verification of RB=RB2 in L3 is correct, the VL tag uses the internally stored data MK and algorithm DFunM(x) to process RA to obtain RA1, and uses RA1 to generate response data ANS BA, and then sends ANS BA to reader.

L5：读写器收到应答数据ANS BA后，用读写器中存放的认证数据MR和算法FunM(x)对应答数据ANS BA中的RA1进行解算得到RA2；并校验由L2中读写器发出去的数据RA与读写器接收到的ANS BA中的RA2，是否相一致，即：RB是否等于RB2。若读写器认证数据MR和算法FunM(x)与VL标签中的认证数据MK和算法DFunM(x)，相匹配，将会有RA=RA2，即校验正确，建立通信链路；否则将无法通过校验，中止建立链接。L5: After the reader receives the response data ANS BA, it uses the authentication data MR stored in the reader and the algorithm FunM(x) to solve RA1 in the response data ANS BA to obtain RA2; and the verification is read by L2 Whether the data RA sent by the writer is consistent with RA2 in the ANS BA received by the reader, that is, whether RB is equal to RB2. If the authentication data MR and algorithm FunM(x) of the reader match with the authentication data MK and algorithm DFunM(x) in the VL tag, there will be RA=RA2, that is, the verification is correct and the communication link is established; otherwise, the Failed to pass verification, aborting link establishment.

本发明的VL标签无需电池供电，减少了电池的污染，也免去更换电池的麻烦；同时由于采用可见光波段的通信信号不受电磁场的干扰，也不产生电磁信号干扰、电磁污染，安全性好，是一种绿色环保的通信方式；同时，光通信信号兼有照明功能，可以为读写过程提供短时的照明，使读写过程更方便；VL标签结构功能简单，可以制作成小型微型设备；装置读写采用非接触工作方式，读写简便。本发明的无源可见光标签及读写器的充电和双向识别方法，可以作为替代磁卡或者射频ID卡的便携式应用方案，克服了诸如信息存储量小、安全性不高、设计复杂、成本高昂、电磁干扰大、辐射大。The VL tag of the present invention does not require battery power supply, reduces battery pollution, and avoids the trouble of replacing batteries; at the same time, because the communication signals in the visible light band are not interfered by electromagnetic fields, electromagnetic signal interference and electromagnetic pollution are not generated, and the safety is good. , is a green and environmentally friendly communication method; at the same time, the optical communication signal also has a lighting function, which can provide short-term lighting for the reading and writing process, making the reading and writing process more convenient; the VL tag has a simple structure and function, and can be made into a small micro device ; Device reading and writing adopts non-contact working mode, easy to read and write. The charging and two-way identification method of the passive visible light tag and the reader-writer of the present invention can be used as a portable application scheme replacing a magnetic card or a radio frequency ID card, and overcomes problems such as small information storage, low security, complex design, high cost, Large electromagnetic interference and radiation.

附图说明Description of drawings

图1 为本发明实施例所用装置的结构框图。Fig. 1 is the structural block diagram of the device used in the embodiment of the present invention.

图中标记：1-读写控制模块；2-通信模块；3-电源模块；4-读写解调解码模块；5-读写调制编码模块；6-电能发送模块；7-读写判决模块；8-读写驱动模块；9-送电线圈；10-标签驱动模块；11-标签判决模块；12-标签调制编码模块；13-标签解调解码模块；14-电能接收模块；15-标签控制模块；16-应答可见光信息；17-读写可见光信息；18-无线电磁能量；19-读写光电接收器；20-标签光电接收器；21-读写光发射器；22-标签光发射器；23-受电线圈。Marks in the figure: 1-read-write control module; 2-communication module; 3-power supply module; 4-read-write demodulation and decoding module; 5-read-write modulation and encoding module; 6-power transmission module; 7-read-write judgment module ;8-Read and write driver module;9-Power transmission coil;10-Tag drive module;11-Tag judgment module;12-Tag modulation and encoding module;13-Tag demodulation and decoding module;14-Power receiving module;15-Tag Control module; 16-respond to visible light information; 17-read and write visible light information; 18-wireless electromagnetic energy; 19-read and write photoelectric receiver; 20-label photoelectric receiver; 21-read and write optical transmitter; 22-label light emission Device; 23-receiving coil.

具体实施方式Detailed ways

实施例：Example:

（一）设置一种无源可见光标签及读写器装置，该装置包括读写器和VL标签；读写器由读写控制模块1、读写解调解码模块4、读写判决模块7、读写调制编码模块5、读写驱动模块8、电能发送模块6、通信模块2、读写光电接收器19、读写光发射器21、送电线圈9、电源模块3组成；VL标签由标签控制模块15、标签解调解码模块13、标签判决模块11、标签调制编码模块12、标签驱动模块10、电能接收模块14、标签光电接收器22、标签光发射器20、受电线圈23组成；读写控制模块1连接读写解调解码模块4、读写调制编码模块5、电能发送模块6、通信模块2、电源模块3，电源模块3连接读写解调解码模块4、读写判决模块7、读写调制编码模块5、读写驱动模块8、电能发送模块6、通信模块2，读写判决模块7连接读写光电接收器19、读写解调解码模块4，读写驱动模块8连接读写光发射器21、读写调制编码模块5，电能发送模块6连接送电线圈9；标签控制模块15连接标签解调解码模块13、标签调制编码模块12、电能接收模块14，电能接收模块14连接标签解调解码模块13、标签判决模块11、标签调制编码模块12、标签驱动模块10、电能接收模块14、标签光电接收器22、标签光发射器20、受电线圈23，标签判决模块11连接标签光电接收器22、标签解调解码模块13，标签驱动模块11连接标签光发射器20、标签调制编码模块12；读写光发射器21通过读写可见光信息17与标签光电接收器22相对应，标签光发射器20通过应答可见光信息16与读写光电接收器19相对应，读写器的送电线圈9通过无线电磁能量18与VL标签的受电线圈23相对应。(1) Set up a passive visible light tag and a reader/writer device, which includes a reader/writer and a VL tag; the reader/writer consists of a read/write control module 1, a read/write demodulation/decoding module 4, a read/write judgment module 7, Read-write modulation and encoding module 5, read-write drive module 8, power transmission module 6, communication module 2, read-write photoelectric receiver 19, read-write optical transmitter 21, power transmission coil 9, and power module 3; VL tags are composed of tags Control module 15, tag demodulation and decoding module 13, tag decision module 11, tag modulation and encoding module 12, tag drive module 10, power receiving module 14, tag photoelectric receiver 22, tag optical transmitter 20, and power receiving coil 23; The read-write control module 1 is connected to the read-write demodulation and decoding module 4, the read-write modulation and encoding module 5, the power transmission module 6, the communication module 2, and the power supply module 3, and the power supply module 3 is connected to the read-write demodulation and decoding module 4, and the read-write judgment module 7. Read-write modulation and encoding module 5, read-write drive module 8, power transmission module 6, communication module 2, read-write judgment module 7 connected to read-write photoelectric receiver 19, read-write demodulation and decoding module 4, read-write drive module 8 Connect the read-write optical transmitter 21, the read-write modulation and encoding module 5, the power transmission module 6 is connected to the power transmission coil 9; the label control module 15 is connected to the label demodulation and decoding module 13, the label modulation and encoding module 12, and the power receiving module 14, and the power receiving Module 14 is connected to tag demodulation and decoding module 13, tag decision module 11, tag modulation and encoding module 12, tag drive module 10, power receiving module 14, tag photoelectric receiver 22, tag optical transmitter 20, power receiving coil 23, and tag judgment The module 11 is connected to the tag photoelectric receiver 22, the tag demodulation and decoding module 13, the tag driver module 11 is connected to the tag optical transmitter 20, and the tag modulation and encoding module 12; 22, the tag optical transmitter 20 corresponds to the read/write photoelectric receiver 19 by responding to the visible light information 16, and the power transmitting coil 9 of the reader corresponds to the receiving coil 23 of the VL tag through wireless electromagnetic energy 18.

所述的读写器用于利用可见光通信的方式，向VL标签发送读写可见光信息17，并接收来自VL标签的应答可见光信息16，以实现与VL标签之间的数据读出或写入操作，分析、处理、验证、存储接收到VL标签的信息，与外部设备进行通信，并给VL标签提供电能。The reader/writer is used to send and read visible light information 17 to the VL tag by means of visible light communication, and receive the response visible light information 16 from the VL tag, so as to realize the data read or write operation with the VL tag, Analyze, process, verify, and store the information received from the VL tag, communicate with external devices, and provide power to the VL tag.

所述电源模块3为读写器的各功能模块提供电能。The power supply module 3 provides electric energy for each functional module of the reader.

所述读写控制模块1用于对读写器的各模块进行功能控制，读写、存储数据，分析处理，验证接收到的VL标签信息。The read-write control module 1 is used for functional control of each module of the reader-writer, read-write, store data, analyze and process, and verify received VL tag information.

所述读写光电接收器19用于感应来自VL标签的可见光信息16，并转换成相应的电信号。The read-write photoelectric receiver 19 is used to sense the visible light information 16 from the VL tag and convert it into a corresponding electrical signal.

所述读写判决模块7用于接收来自读写光电接收器19转换后的电信号，转换成数字信号。The read/write judgment module 7 is used to receive the converted electrical signal from the read/write photoelectric receiver 19 and convert it into a digital signal.

所述读写解调解码模块4用于对读写判决模块7输出的数字信号，进行解调、解码。The read-write demodulation and decoding module 4 is used to demodulate and decode the digital signal output by the read-write decision module 7 .

所述读写调制编码模块5对读写控制模块1发送来的数据信号进行编码，并调制成适合无线光信道传输的信号。The read-write modulation and encoding module 5 encodes the data signal sent by the read-write control module 1 and modulates it into a signal suitable for wireless optical channel transmission.

所述读写驱动模块8用于根据读写调制编码模块5发送来的信号，驱动读写光发射器21发送读写可见光信息17。The read-write drive module 8 is used to drive the read-write light transmitter 21 to send the read-write visible light information 17 according to the signal sent by the read-write modulation and encoding module 5 .

所述通信模块2用于与外部设备建立通信，实现数据交互、机构控制。The communication module 2 is used to establish communication with external devices to realize data interaction and mechanism control.

所述读写光发射器21用于在读写驱动模块8的作用下，发送读写可见光信息17。The read-write light transmitter 21 is used for sending read-write visible light information 17 under the action of the read-write drive module 8 .

所述电能发送模块6用于产生适用于无线电能传输的电能信号。The power sending module 6 is used for generating power signals suitable for wireless power transmission.

所述送电线圈9用于将电能发送模块6产生的电能信号，发送出去，形成充电电磁场，对外提供无线电磁能量18。The power sending coil 9 is used to send out the power signal generated by the power sending module 6 to form a charging electromagnetic field and provide wireless electromagnetic energy 18 to the outside.

所述VL标签从读写器获得的无线电磁能量18供电而上电工作，以可见光通信的方式，向读写器发送应答可见光信息16，接收来自读写器的读写可见光信息17，以实现与读写器之间的数据读出或写入操作，分析、验证、存储、处理接收到读写器的信息。The VL tag is powered by the wireless electromagnetic energy 18 obtained by the reader-writer to work on power, sends a response visible light information 16 to the reader-writer in the form of visible light communication, and receives read-write visible light information 17 from the reader-writer to realize Read or write data with the reader, analyze, verify, store, and process the information received by the reader.

所述标签控制模块15用于对读写器的各模块进行功能控制，读写、存储数据，分析处理接收到的VL标签的信息。The tag control module 15 is used to control the functions of each module of the reader-writer, read, write and store data, and analyze and process the received VL tag information.

所述受电线圈23用于感应接收来自送电线圈9的无线电磁能量18，并用电能接收模块14收集。The power receiving coil 23 is used to inductively receive the wireless electromagnetic energy 18 from the power transmitting coil 9 and collect it with the power receiving module 14 .

所述电能接收模块14用于收集受电线圈23感应到的无线电磁能量18，用于为标签各模块供给电能。The power receiving module 14 is used to collect the wireless electromagnetic energy 18 sensed by the power receiving coil 23 and to supply power to each module of the tag.

所述标签调制编码模块12对标签控制模块15发送来的各种信息进行编码，并调制成适合无线光信道传输的信号。The label modulation and encoding module 12 encodes various information sent by the label control module 15, and modulates them into signals suitable for wireless optical channel transmission.

所述标签驱动模块10用于根据标签调制编码模块12发送来的信号，驱动标签光发射器20发送应答可见光信息16。The label driving module 10 is used to drive the label light transmitter 20 to send the response visible light information 16 according to the signal sent by the label modulation and encoding module 12 .

所述标签光发射器20用于发送应答可见光信息16。The tag light transmitter 20 is used to send and reply visible light information 16 .

所述标签光电接收器22用于接收来自标签发送的读写可见光信息17，并转换成相应的电信号。The tag photoelectric receiver 22 is used to receive the read-write visible light information 17 sent from the tag and convert it into a corresponding electrical signal.

所述标签判决模块11用于将标签光电接收器22发送来的电信号，转换成数字信号。The label decision module 11 is used to convert the electrical signal sent by the label photoelectric receiver 22 into a digital signal.

所述标签解调解码模块13用于对标签判决模块11输出的数字信号，进行解调，并解码。The label demodulation and decoding module 13 is used to demodulate and decode the digital signal output by the label decision module 11 .

（二）所述的无源可见光标签及读写器装置的供电和启动方式，步骤如下：(2) The power supply and start-up method of the passive visible light tag and the reader device are as follows:

P1、读写器上电后进入待机状态，待机状态下电源模块3只向电能发送模块6和送电线圈9供电，电能发送模块6和送电线圈9处于空载状态，形成可以对外提供无线电磁能量18的读写器工作区域。P1. After the reader is powered on, it enters the standby state. In the standby state, the power supply module 3 only supplies power to the power transmission module 6 and the power transmission coil 9. The power transmission module 6 and the power transmission coil 9 are in a no-load state, forming a wireless power supply that can be provided externally. Electromagnetic energy 18 of the reader working area.

P2、VL标签在远离读写器的工作区域时，处于无源的状态，不工作，当VL标签进入读写器的工作区域后，获得无线电磁能量18上电工作，同时受电线圈会对送电线圈9产生一个感应电磁场，该感应电磁场与送电线圈9产生的互感效应会引起受电线圈23和送电线圈9之间的电磁场的电磁参数变化。P2. When the VL tag is far away from the working area of the reader, it is in a passive state and does not work. When the VL tag enters the working area of the reader, it obtains wireless electromagnetic energy 18 and powers on to work. At the same time, the receiving coil will The power transmitting coil 9 generates an induced electromagnetic field, and the mutual inductance effect between the induced electromagnetic field and the power transmitting coil 9 will cause the electromagnetic parameters of the electromagnetic field between the power receiving coil 23 and the power transmitting coil 9 to change.

P3、电能发送模块6和送电线圈9感测到由互感效应引起的电磁参数的变化后，电能发送模块6就向电源模块3发出启动信号，电源模块3向读写器的其他功能模块提供电能，读写器各模块都上电进入正常工作状态，就可以与VL标签进行通信。P3. After the power transmission module 6 and the power transmission coil 9 sense the change of the electromagnetic parameter caused by the mutual inductance effect, the power transmission module 6 sends a start signal to the power module 3, and the power module 3 provides the power supply to other functional modules of the reader. Power, each module of the reader is powered on and enters the normal working state, then it can communicate with the VL tag.

（三）所述的VL标签与读写器的工作在双工通信模式，在读写器到VL标签的下行通信信道和VL标签到读写器的上行通信信道，分别采用两组不同波段的带通滤镜，保证两个信道不会相互干扰。(3) The VL tag and the reader-writer work in duplex communication mode. In the downlink communication channel from the reader-writer to the VL tag and the uplink communication channel from the VL tag to the reader-writer, two groups of different bands are used respectively. A bandpass filter ensures that the two channels do not interfere with each other.

（四）所述的VL标签进入到读写器工作区域，获得电能，VL标签和读写器各模块都上电工作后，两者的通信分为两个过程：(4) The VL tag enters the working area of the reader to obtain power. After the VL tag and the modules of the reader are powered on and working, the communication between the two is divided into two processes:

1）所述的VL标签向读写器发送应答可见光信息16，读写器接收来自VL标签的应答可见光信息17。1) The VL tag sends the response visible light information 16 to the reader-writer, and the reader-writer receives the response visible light information 17 from the VL tag.

在VL标签端有以下几步：On the VL tag side there are the following steps:

S1、VL标签控制模块15将待发送信息输入至标签调制编码模块12。S1. The VL label control module 15 inputs the information to be sent to the label modulation and encoding module 12 .

S2、标签调制编码模块12对VL标签控制模块15输出的信息，进行调制、编码后，并输出到标签驱动模块10。S2. The label modulation and encoding module 12 modulates and encodes the information output by the VL label control module 15, and outputs it to the label driving module 10.

S3、标签驱动模块10根据经过调制编码的信息，驱动标签光发射器20应答发出可见光信息16。S3. The label driving module 10 drives the label light emitter 20 to respond and send out the visible light information 16 according to the modulated and coded information.

在读写器端有以下几步：On the reader side there are the following steps:

R1、读写光电接收器19接收来自VL标签光发射器20发来的应答可见光信息16，并转换成相应的电信号。R1, the read-write photoelectric receiver 19 receives the response visible light information 16 sent from the VL tag light transmitter 20, and converts it into a corresponding electrical signal.

R2、再由读写判决模块7将读写光电接收器19转换的模拟电信号，转换成相应的数字信号，并输出到读写解调解码模块4。R2. The read-write decision module 7 converts the analog electrical signal converted by the read-write photoelectric receiver 19 into a corresponding digital signal, and outputs it to the read-write demodulation and decoding module 4 .

R3、读写解调解码模块4将数字信号进行解调解码，转换成原始的信息并输出至读写控制模块1。R3. The read-write demodulation and decoding module 4 demodulates and decodes the digital signal, converts it into original information and outputs it to the read-write control module 1 .

R4、读写控制模块1对读写解调解码模块4输出的信息，进行分析处理。R4. The read-write control module 1 analyzes and processes the information output by the read-write demodulation and decoding module 4 .

2）所述的读写器向VL标签发送读写可见光信息17，VL标签接收来自读写器的读写可见光信息16。2) The reader/writer sends read/write visible light information 17 to the VL tag, and the VL tag receives read/write visible light information 16 from the reader/writer.

在读写器端有以下几步：On the reader side there are the following steps:

S1、读写控制模块1将待发送信息输入至读写调制编码模块5。S1. The read-write control module 1 inputs the information to be sent to the read-write modulation and coding module 5 .

S2、读写调制编码模块5对读写控制模块1输出的信息进行调制编码，并输出到读写驱动模块8。S2. The read-write modulation and encoding module 5 modulates and encodes the information output by the read-write control module 1 and outputs it to the read-write drive module 8 .

S3、读写驱动模块8根据经过调制编码的信息，驱动读写光发射器21发出读写可见光信息17。S3. The read-write drive module 8 drives the read-write light emitter 21 to emit the read-write visible light information 17 according to the modulated and coded information.

在VL标签端有以下几步：On the VL tag side there are the following steps:

R1、标签光电接收器22接收来自读写光发射器21发来的读写可见光信息17，并转换相应的模拟电信号。R1, the tag photoelectric receiver 22 receives the read-write visible light information 17 sent from the read-write optical transmitter 21, and converts corresponding analog electrical signals.

R2、再由标签判决模块11将标签光电接收器22转换的模拟电信号，转换成相应的数字信号，并输出到标签解调解码模块13。R2. The tag judgment module 11 converts the analog electrical signal converted by the tag photoelectric receiver 22 into a corresponding digital signal, and outputs it to the tag demodulation and decoding module 13 .

R3、标签解调解码模块13将数字信号进行解调解码，转换成原始的信息并输出至VL标签控制模块15。R3. The tag demodulation and decoding module 13 demodulates and decodes the digital signal, converts it into original information and outputs it to the VL tag control module 15 .

R4、VL标签控制模块15对标签解调解码模块13输出的信息，进行分析处理。R4. The VL label control module 15 analyzes and processes the information output by the label demodulation and decoding module 13 .

（五）所述的VL标签与读写器建立通信链路的方式如下：(5) The method of establishing a communication link between the VL tag and the reader is as follows:

VL标签进入到读写器工作区域，获得电能，VL标签和读写器各模块都上电工作后，读写器和VL标签进行正常的数据交换前，首先要通过双向的身份认证方式，建立通信链路，步骤如下：The VL tag enters the working area of the reader to obtain power. After the VL tag and the modules of the reader are powered on, before the normal data exchange between the reader and the VL tag, the two-way identity authentication must be established first. Communication link, the steps are as follows:

L1：VL标签向读写器发送一个数据RB。L1: The VL tag sends a data RB to the reader.

L2：读写器收到数据RB后，读写器采用内部存放的认证数据MR和算法FunM(x)，对数据RB进行处理后得到RB1，RB1和读写器的一个数据RA组成ANS AB，并向VL标签发送一个应答数据ANS AB。L2: After the reader receives the data RB, the reader uses the internally stored authentication data MR and the algorithm FunM(x), processes the data RB to obtain RB1, RB1 and a data RA of the reader form ANS AB, And send a response data ANS AB to the VL tag.

L3：VL标签收到ANS AB 后，从ANS AB中提取出RB1，用VL标签中的认证数据MK和算法DFunM(x)，对ANS AB中的RB1部分进行解算得到RB2，并校验由L1的VL标签发出的数据RB与步骤L3中VL标签接收到的ANS AB解算中的RB2，是否一致，即：RB是否等于RB2。若读写器认证数据MR和算法FunM(x)与VL标签中的认证数据MK和算法DFunM(x)，相匹配，将会有RB=RB2，即校验正确，进入L4；否则将无法通过校验，中止建立链接。L3: After the VL label receives ANS AB, it extracts RB1 from ANS AB, uses the authentication data MK in the VL label and the algorithm DFunM(x), solves the RB1 part in ANS AB to obtain RB2, and verifies it by Whether the data RB sent by the VL tag of L1 is consistent with the RB2 in the ANS AB solution received by the VL tag in step L3, that is, whether RB is equal to RB2. If the authentication data MR and algorithm FunM(x) of the reader match with the authentication data MK and algorithm DFunM(x) in the VL label, there will be RB=RB2, that is, the verification is correct and enter L4; otherwise, it will fail Verify, abort establishing a connection.

L4：如果L3中RB=RB2的校验正确，则VL标签用内部存放的数据MK和算法DFunM(x)对RA进行运算处理后得到RA1，并用RA1生成应答数据ANS BA，再发送ANS BA给读写器。L4: If the verification of RB=RB2 in L3 is correct, the VL tag uses the internally stored data MK and algorithm DFunM(x) to process RA to obtain RA1, and uses RA1 to generate response data ANS BA, and then sends ANS BA to reader.

L5：读写器收到应答数据ANS BA后，用读写器中存放的认证数据MR和算法FunM(x)对应答数据ANS BA中的RA1进行解算得到RA2；并校验由L2中读写器发出去的数据RA与读写器接收到的ANS BA中的RA2，是否相一致，即：RB是否等于RB2。若读写器认证数据MR和算法FunM(x)与VL标签中的认证数据MK和算法DFunM(x)，相匹配，将会有RA=RA2，即校验正确，建立通信链路；否则将无法通过校验，中止建立链接。L5: After the reader receives the response data ANS BA, it uses the authentication data MR stored in the reader and the algorithm FunM(x) to solve RA1 in the response data ANS BA to obtain RA2; and the verification is read by L2 Whether the data RA sent by the writer is consistent with RA2 in the ANS BA received by the reader, that is, whether RB is equal to RB2. If the authentication data MR and algorithm FunM(x) of the reader match with the authentication data MK and algorithm DFunM(x) in the VL tag, there will be RA=RA2, that is, the verification is correct and the communication link is established; otherwise, the Failed to pass verification, aborting link establishment.

Claims (1)

1. the charging of passive visible ray label and read write line and a bidirectional recognition method, is characterized in that concrete steps are:

(1) a kind of passive visible ray label and read-and-write device are set, device comprises VL label, read write line, and read write line is made up of Read-write Catrol module, read-write demodulating and decoding module, read-write judging module, read-write modulating-coding module, read-write driver module, electric energy sending module, communication module, read-write photelectric receiver, read-write optical transmitting set, power transmission coil, power module; VL label is made up of label control module, label demodulating and decoding module, label judging module, tag modulates coding module, label driver module, electric energy receiver module, label photelectric receiver, label optical transmitting set, electricity reception coil; Read-write Catrol model calling read-write demodulating and decoding module, read-write modulating-coding module, electric energy sending module, communication module, power module, power module connects read-write demodulating and decoding module, read-write judging module, read-write modulating-coding module, read-write driver module, electric energy sending module, communication module, read-write judging module connects read-write photelectric receiver, read-write demodulating and decoding module, read-write driver module connects read-write optical transmitting set, read-write modulating-coding module, and electric energy sending module connects power transmission coil; Label control module connects label demodulating and decoding module, tag modulates coding module, electric energy receiver module, electric energy receiver module connects label demodulating and decoding module, label judging module, tag modulates coding module, label driver module, electric energy receiver module, label photelectric receiver, label optical transmitting set, electricity reception coil, label judging module connects label photelectric receiver, label demodulating and decoding module, and label driver module connects label optical transmitting set, tag modulates coding module; Read-write optical transmitting set is corresponding with label photelectric receiver by read-write visible ray information, label optical transmitting set is corresponding with read-write photelectric receiver by response visible ray information, and the power transmission coil of read write line is corresponding with the electricity reception coil of VL label by wireless electromagnetic energy;

Described read write line is for utilizing the mode of visible light communication, read-write visible ray information is sent to VL label, and the response visible ray information received from VL label, with the data reading between realization with VL label or write operation, analyze, process, verify, store the information receiving VL label, carry out data communication with external unit, and provide electric energy to VL label;

Each functional module that described power module is read write line provides electric energy;

Described Read-write Catrol module is used for carrying out function control to each module of read write line, read-write, storage data, and analyzing and processing, verifies the VL label information received, carry out exchanges data by communication module and external unit;

Described read-write photelectric receiver for responding to the response visible ray information from VL label, and converts corresponding electric signal to;

Described read-write judging module receives the electric signal after from the conversion of read-write photelectric receiver for reading and writing, and converts digital signal to;

Described read-write demodulating and decoding module is used for the digital signal exported read-write judging module, carries out demodulation, decoding;

Described read-write modulating-coding module is encoded to the data-signal that Read-write Catrol module is sent, and is modulated into the signal of applicable wireless optical channel transmission;

Described read-write driver module is used for the signal sent according to read-write modulating-coding module, drives read-write optical transmitting set to send read-write visible ray information;

Described communication module is used for setting up with external unit communicating, and external device sends data, receives the data of external unit, realizes data interaction, mechanism controls;

Described read-write optical transmitting set is used under the effect of read-write driver module, sends read-write visible ray information;

Described electric energy sending module is for generation of the electric power signal being applicable to wireless power transmission;

Described power transmission coil is used for the electric power signal produced by electric energy sending module, sends, and forms charged electrical magnetic field;

Described VL label is powered by the radio energy obtained from read write line and works on power, in the mode of visible light communication, response visible ray information is sent to read write line, receive the read-write visible ray information from read write line, read or write operation with the information realized between read write line, analyze, verify, store, process the information receiving read write line;

Described label control module is used for carrying out function control to each module of VL label, read-write, storage data, the read write line data message that analyzing and processing receives;

Described electricity reception coil for responding to the radio magnetic energy received from power transmission coil, and accepts module collection with electric energy;

The radio magnetic energy that described electric energy receiver module senses for collecting electricity reception coil, for being each module supply of electrical energy of label;

Described tag modulates coding module is encoded to the various information that label control module is sent, and is modulated into the signal of applicable wireless optical channel transmission;

Described label driver module is used for the signal sent according to tag modulates coding module, drives label optical transmitting set to send response visible ray information;

Described label optical transmitting set is for sending response visible ray information;

Described label photelectric receiver for receiving the read-write visible ray information sent from read write line, and converts corresponding electric signal to;

Described label judging module is used for the electric signal sent by label photelectric receiver, converts digital signal to;

Described label demodulating and decoding module is used for the digital signal exported label judging module, carries out demodulation, and decodes;

(2) the passive visible ray label described in and the power supply of read-and-write device and Starting mode, step is as follows:

Enter holding state after P1, read write line power on, under holding state, power module is only to electric energy sending module and power transmission coil power supply, and electric energy sending module and power transmission coil are in light condition, forms the read write line perform region that externally can provide wireless electromagnetic energy;

P2, VL label is when the perform region away from read write line, be in passive state, do not work, after VL label enters the perform region of read write line, obtain wireless electromagnetic energy to work on power, electricity reception coil can produce an induction field to power transmission coil simultaneously, and the mutual inductance effect that this induction field and power transmission coil produce can cause the electromagnetic parameter of the electromagnetic field between electricity reception coil and power transmission coil to change;

After P3, electric energy sending module and power transmission coil transduces to the change of the electromagnetic parameter caused by mutual inductance effect, electric energy sending module just sends enabling signal to power module, power module provides electric energy to other functional modules of read write line, the each module of read write line all powers on and enters normal operating conditions, just can communicate with VL label;

(3) the VL label described in and the communication pattern of read write line, there are half-duplex and full duplex two kinds of modes, under way communication, at read write line to the downlink communication channel of VL label and VL label to the uplink communication channel of read write line, the band of two groups of different-wavebands is adopted to lead to filter respectively, the visible light wave range that the visible light wave range that uplink communication channel is selected and downlink communication channel are selected does not have overlapping, ensures that two channels can not disturb mutually;

(4) the VL label described in enters into read write line perform region, and obtain electric energy, after VL label and each module of read write line all work on power, both communication is divided into two processes:

1) VL label sends response visible ray information to read write line, and read write line receives the response visible ray information from VL label;

In VL tab end: information to be sent is inputed to tag modulates coding module by S1, VL label control module; The information that S2, tag modulates coding module export VL label control module, after carrying out modulating, encoding, and outputs to label driver module; S3, label driver module, according to the information through modulating-coding, drive label optical transmitting set to send response visible ray information;

Receive the response visible ray information sent from label optical transmitting set at read write line end: R1, read-write photelectric receiver, and convert corresponding electric signal to; R2, the analog electrical signal changed by read-write photelectric receiver by read-write judging module again, convert corresponding digital signal to, and output to read-write demodulating and decoding module; Digital signal is carried out demodulating and decoding by R3, read-write demodulating and decoding module, converts original information to and exports Read-write Catrol module to; The information that R4, Read-write Catrol module export read-write demodulating and decoding module, carries out analyzing and processing;

2) read write line sends read-write visible ray information to VL label, and VL label receives the read-write visible ray information from read write line;

In read write line end: S1, Read-write Catrol module, information to be sent is inputed to read-write modulating-coding module; S2, read-write modulating-coding module are carried out modulating-coding to the information that Read-write Catrol module exports, and are outputted to read-write driver module; S3, read-write driver module, according to the information through modulating-coding, drive read-write optical transmitting set to send read-write visible ray information;

Receive the read-write visible ray information sent from read-write optical transmitting set at VL tab end: R1, label photelectric receiver, and change corresponding analog electrical signal; R2, the analog electrical signal changed by label photelectric receiver by label judging module again, convert corresponding digital signal to, and output to label demodulating and decoding module; Digital signal is carried out demodulating and decoding by R3, label demodulating and decoding module, converts original information to and exports Read-write Catrol module to; The information that R4, VL label control module exports label demodulating and decoding module, carries out analyzing and processing;

(5), after the VL label described in and each module of read write line power on and normally work, before read write line and VL label carry out exchanges data, will set up communication link by two-way identification authentication mode, step is:

L1:VL label sends a data RB to read write line;

L2: after read write line receives data RB, read write line adopts verify data MR and algorithm FunM (x) of internal storage, obtain RB1 to after data RB process, a data RA of RB1 and read write line forms ANS AB, and sends a reply data ANS AB to VL label;

After L3:VL label receives ANS AB, RB1 is extracted from ANS AB, with the verify data MK in VL label and algorithm DFunM (x), RB1 part in ANS AB is resolved and obtains RB2, and verify ANS AB that in the data RB that sent by the VL label of L1 and step L3, VL label receives resolve in RB2, whether consistent, that is: whether RB equals RB2; If read write line verify data MR and algorithm FunM (x) and the verify data MK in VL label and algorithm DFunM (x), match, will have RB=RB2, namely verification correctly, enters L4; Otherwise cannot, by verification, stop to establish the link;

L4: if the verification of RB=RB2 is correct in L3, then obtain RA1 after the data MK of VL label internal storage and algorithm DFunM (x) carry out calculation process to RA, and generate reply data ANS BA with RA1, then send ANS BA to read write line;

L5: after read write line receives reply data ANS BA, to resolve the RA1 in reply data ANS BA with the verify data MR deposited in read write line and algorithm FunM (x) and obtains RA2; And the RA2 verified in the ANS BA that the data RA that sent out by read write line in L2 and read write line receive, whether consistent, that is: whether RB equals RB2; If read write line verify data MR and algorithm FunM (x) and the verify data MK in VL label and algorithm DFunM (x), match, will have RA=RA2, namely verification correctly, sets up communication link; Otherwise cannot, by verification, stop to establish the link.