CN112486013B - Multi-node control system, regional wireless time service device thereof and landscape lighting system - Google Patents

Abstract

The invention discloses a multi-node control system, a regional wireless time service device and a landscape lighting system, wherein the regional wireless time service device comprises: each subarea is provided with a data transceiver, a transmitter and a group of receivers, and the transmitter is connected with the receivers in a wireless transmission mode; the data transceiver is used for acquiring the time service information and transmitting the time service information to the transmitter; the data communication module is respectively connected with the data transceiver and the wireless transceiver module, the wireless transceiver module is connected with the local clock module and is connected with each receiver, and the data transceiver is used for wirelessly transmitting time service information to each receiver when signals exist in the data transceiver and wirelessly transmitting time information of the local clock module to each receiver when no signals exist in the data transceiver. The method is applied to a landscape lighting system or a multi-node control system thereof, so that the file is accurately played on time, and a plurality of display nodes are matched with each other to display a complete image or video, and the method is particularly suitable for synthesizing a large number of thousands of nodes to play one video together.

Description

Multi-node control system, regional wireless time service device thereof and landscape lighting system

Technical Field

The invention relates to simultaneous display control of a plurality of display devices, in particular to a multi-node control system, a regional wireless time service device and a landscape lighting system.

Background

Time service (time service) refers to the work of transmitting a standard time signal by using radio waves, and is divided into short-wave time service, long-wave time service, satellite time service, mobile data time service and the like according to different time service means. The short-wave time service and the long-wave time service have lower precision; the satellite time service scheme is influenced by environmental factors such as weather, landform, building shielding and the like, the signal is weak, and the capability of adapting to complex environments is poor; the mobile data time service scheme cannot be implemented in an area which cannot be covered by a mobile data signal, and needs to be opened, so that the cost is high. Accordingly, the prior art is deficient and needs improvement.

In the prior art, as shown in fig. 1, each satellite signal transceiver or mobile data transceiver a corresponds to a receiver C, which not only has the above-mentioned disadvantages, but also the cost of the satellite signal transceiver or mobile data transceiver a is high.

Disclosure of Invention

The invention provides a novel multi-node control system, a regional wireless time service device and a landscape lighting system thereof, and aims to solve the technical problems that: how to give accurate time service in view lighting system or its multinode control system and compromise time service cost, accuracy and adaptation complex environment ability, make the file broadcast on time accurately and thus match and show complete overall effect etc. each other.

The technical scheme of the invention is as follows:

a regional wireless time service device of a multi-node control system comprises: the system comprises a data transceiver, M transmitters and N receivers which are divided into M groups;

setting the area of the multi-node control system into M sub-areas, wherein each sub-area is provided with a data transceiver, a transmitter and a group of receivers, and the transmitter is connected with the receivers in a wireless transmission mode;

the data transceiver is used for acquiring the time service information and transmitting the time service information to the transmitter;

the transmitter is provided with a data communication module, a local clock module and a wireless transceiving module, the data communication module is respectively connected with the data transceiver and the wireless transceiving module, the wireless transceiving module is connected with the local clock module and is connected with each receiver in a wireless transmission mode, the wireless transceiving module is used for wirelessly transmitting time service information to each receiver when the data transceiver has signals, and wirelessly transmitting time information of the local clock module to each receiver when the data transceiver has no signals.

Preferably, the transmitter is provided with a test module, the transmitter and the receivers adopt default preset parameter packets when being powered on, the transmitter broadcasts and sends a plurality of frames of preset data to each receiver in the same subregion and receives the feedback data packet of each receiver, the test module is used for adjusting the parameters in the current preset parameter packet downwards for retesting when the error rate in the feedback data packet exceeds a preset threshold value, and selecting other preset parameter packets as the default preset parameter packets when the error rate in the retested feedback data packet exceeds the preset threshold value.

Preferably, the wireless transceiver module is further configured to correct the time information of the local clock module according to the time service information of the data transceiver.

Preferably, the number of the data transceivers is M, and each sub-area is independently provided with one data transceiver.

Preferably, the number of data transceivers is one, and each sub-area shares one data transceiver.

Preferably, the transmitter operates at a frequency of 410 to 533Mhz.

Preferably, the transmitter is connected to each receiver in a wireless transmission manner, and performs symmetric algorithm encryption processing on the frame data.

Preferably, M is a natural number.

Preferably, M is a natural number greater than one.

Preferably, M is a natural number equal to or greater than two and at least two sub-regions have portions overlapping each other.

Preferably, N is a multiple of M, and the number of each group of receivers is the same.

Preferably, the number of receivers in at least one group is different from the number of receivers in the other groups.

Preferably, the receiver comprises a data communication module, a data recovery module and a time setting module which are connected in sequence.

Preferably, the data transceiver includes a satellite signal transceiver and a mobile data transceiver.

A multi-node control system comprises any one of the regional wireless time service devices, and the regional wireless time service devices are adopted to carry out wireless time service on each sub-region.

A landscape lighting system comprising the multi-node control system of any one of.

By adopting the scheme, the invention can provide a time service technical scheme with better time service cost, accuracy and capability of adapting to complex environment, and the time service technical scheme is applied to a landscape lighting system or a multi-node control system thereof, so that a file is accurately played on time, a plurality of display nodes are matched with each other to display a complete image or video, a complete integral effect is achieved, the time service system is particularly suitable for playing a video together by a large number of thousands of nodes, and has very high market application value.

Drawings

FIG. 1 is a schematic diagram of a prior art implementation;

FIG. 2 is a schematic diagram of an embodiment of a regional wireless time service device according to the invention;

FIG. 3 is a schematic diagram of another embodiment of a regional wireless time service device according to the invention;

FIG. 4 is a sub-area schematic view of the embodiment of FIG. 3;

FIG. 5 is a schematic view of another subregion of the embodiment shown in FIG. 3;

FIG. 6 is a schematic view of another subregion of the embodiment shown in FIG. 3;

fig. 7 is a schematic diagram of another embodiment of the regional wireless time service device according to the invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The landscape lighting system comprises but not limited to an outdoor large display screen or a display system, and can comprise thousands of display modules, and when the landscape lighting system is used for displaying, each display module needs to be strictly controlled to display specific content at a specific time, so that the integral display of the landscape lighting system can be realized. The invention makes use of radio signals, i.e. radio signals open in the public frequency range, which can be used for communication within a local range, e.g. within a radius of 5 km. One embodiment of the present invention is directed to a regional wireless time service device of a multi-node control system, including: the system comprises a data transceiver, M transmitters and N receivers which are divided into M groups; setting the area of the multi-node control system into M sub-areas, wherein each sub-area is provided with a data transceiver, a transmitter and a group of receivers, and the transmitter is connected with the receivers in a wireless transmission mode; the data transceiver is used for acquiring the time service information and transmitting the time service information to the transmitter; the transmitter is provided with a data communication module, a local clock module and a wireless transceiving module, the data communication module is respectively connected with the data transceiver and the wireless transceiving module, the wireless transceiving module is connected with the local clock module and is connected with each receiver in a wireless transmission mode, the wireless transceiving module is used for wirelessly transmitting time service information to each receiver when the data transceiver has signals, and wirelessly transmitting time information of the local clock module to each receiver when the data transceiver has no signals. By adopting the scheme, the invention can provide a time service technical scheme with better time service cost, accuracy and capability of adapting to complex environment integrally, and the time service technical scheme is applied to a landscape lighting system or a multi-node control system thereof, so that a file is accurately played on time, a plurality of display nodes are matched with one another to display a complete image or video, a complete integral effect is achieved, the time service system is particularly suitable for playing a video together by a large number of thousands of nodes, and has very high market application value.

The N receivers are divided into M groups, and the receivers in each group can be the same or different; preferably, N is a multiple of M, and the number of each group of receivers is the same. Alternatively, the number of receivers in at least one group is different from the number of receivers in the other groups. Therefore, the problem that the number of the receivers cannot be evenly distributed can be solved, the wireless signal coverage areas are different, the number of the corresponding receivers may also be different, and preferably, the N receivers are divided into M groups according to the wireless signal receiving and transmitting range. Therefore, the data transceiver can be used as little as possible, namely, the use amount of the data transceiver is reduced, so that the cost is saved, and meanwhile, the system is simplified. Preferably, the data transceiver includes a satellite signal transceiver and a mobile data transceiver. The satellite signal transceiver is used for acquiring the time service information of the satellite, namely the satellite time service signal, and transmitting the time service information to the transmitter; the mobile data transceiver is used for acquiring the time service information of the mobile data signal and transmitting the time service information to the transmitter. Preferably, the receiver comprises a data communication module, a data recovery module and a time setting module which are connected in sequence. The receiver can be added with a data communication module in a wireless transmission mode on the basis of the prior art; for the data processed by encryption, a data restoring module may be provided.

In order to realize the synchronization of video playing among multiple nodes, the landscape lighting system needs to ensure that the time difference among different nodes is less than 40ms, but a local clock is not feasible due to the self-reason of equipment, for example, an active crystal oscillator continuously has deviation, so the system is realized mainly by means of satellite time service/base station time service/network time service and the like, but the satellite time service is greatly influenced by environmental factors such as weather, ground features, building shielding and the like and is unstable; the mobile data time service is greatly influenced by the coverage range of a base station signal, and the cost is high because an Internet of things card needs to be opened and a time service server needs to be erected; preferably, the value of M is set according to the coverage area of the wireless transceiver module, and when the signal transceiving area of the wireless transceiver module can cover the whole area, M is one; when the signal transceiving range of the wireless transceiving module cannot cover the whole area, M is a numerical value which can cover the whole area after the plurality of wireless transceiving modules are combined; that is, the M wireless transceiver modules can cover the whole area after being combined. The invention adopts the radio signal of the public frequency band to carry on the synchronous time setting in the local scope, relative to satellite time service, it is minor to be influenced by external environment factor, relative to base station time service and network time service, it is with low costs to erect, is not influenced by base station distribution, etc.; if the signal coverage range does not reach the whole area, the signal coverage range can be divided into a plurality of sub-areas, transmitters of each sub-area are synchronized through satellite time service/base station time service/network time service and other modes, the number of satellite time service/base station time service/network time service nodes needing to be erected is reduced by tens of to hundreds of times, namely the cost is only about 1 to 5 percent of the original cost, and the difficulty and the cost of engineering implementation are greatly reduced.

In order to ensure the data security and the consistency of the playing time, for example, there is a possibility of being monitored in the wireless data transmission, it is preferable that the transmitter is connected to each receiver in a wireless transmission manner, and the frame data is subjected to symmetric algorithm encryption processing. Preferably, the transmitter is further provided with a data encryption module, and the data encryption module is used for encrypting data; preferably, the data encryption module is configured to encrypt each byte in the data frame by using a symmetric algorithm AES/ECB/PKCS5Padding, and the key is replaced in round-robin manner according to a predetermined rule, so that security of wireless data transmission can be enhanced.

In order to avoid data errors, for example, the probability of data packet damage in wireless communication, it is preferable that the transmitter further includes a data redundancy module, and the data redundancy module is configured to perform data redundancy verification or data redundancy processing, or perform data redundancy processing and data redundancy verification; preferably, the data redundancy module is configured to perform data redundancy processing on each data frame to generate at least two sub-data packets with the same content and including check data; preferably, the data redundancy module is used for performing data redundancy processing on each data frame to generate 3-part sub-data packets with the same content and including check data; that is, one frame of data is composed of 3 sub-packets, each sub-packet has the same content and contains verification data; the receiver receives any 1 complete sub data packet which passes the check, and the receiving is regarded as successful, so that the probability of single data transmission failure is reduced. Therefore, the accuracy of data transmission can be ensured.

In order to solve the problem of time delay caused by wireless signal transmission, the transmitter is preferably further provided with a time delay measuring module, and the time delay measuring module is used for carrying out time delay measurement on wireless signal transmission, namely carrying out time delay measurement on wireless signal transmission of a wireless channel; preferably, the wireless transceiver module sends the display data and the time service information to each receiver in a wireless transmission mode, a time stamp is added to each frame of data of the display data, the wireless transceiver module is further used for receiving a response with the time stamp returned by each receiver, and the delay measurement module is used for measuring the delay condition of wireless signal transmission according to the display data and the response thereof; preferably, the transmitter is further provided with a delay compensation module, and the delay compensation module is used for performing synchronous compensation according to the delay measurement result. Preferably, the delay compensation module is used for performing synchronous compensation according to the delay measurement result to adjust the time service time. That is to say, the wireless data transmission delay varies with the transmission rate, the coding mode and other parameters, and the transmission delay floats from several milliseconds to several thousand milliseconds, so the transmission path delay must be considered in the synchronous time service, for example, a transmitter is equipped with a high-precision clock source, an active crystal oscillator with a temperature compensation function is generally adopted, the accuracy of the active crystal oscillator is less than 10ppm, the deviation of the clock per second is less than 1 microsecond, the transmitter carries a timestamp when sending a frame of data, the receiver returns the timestamp additionally when returning a response, the transmitter can calculate the path delay when receiving the response, which is recorded as T, the time service time is overlapped by T/2 before sending the time service information, and so on.

In order to calibrate the time information of the local clock module, preferably, the transmitter is further provided with a local compensation module, and the local compensation module is used for compensating the time information of the local clock module according to the time service information of the data transceiver; preferably, the transmitter is further provided with a channel selection module, the channel selection module is configured to select to switch the wireless channel, and preferably, when the delay measurement result of the delay measurement module exceeds a preset delay threshold, the channel selection module selects to switch the wireless channel; preferably, the transmitter is further provided with a data encryption module, a data redundancy module, a local compensation module, a delay measurement module, a channel selection module and a delay compensation module; the data encryption module is used for encrypting data; the data redundancy module is used for carrying out data redundancy verification or data redundancy processing; the local compensation module is used for compensating the time information of the local clock module according to the time service information of the data transceiver; the channel selection module is used for selecting and switching wireless channels; the delay measurement module is used for carrying out delay measurement on wireless signal transmission; and the delay compensation module is used for carrying out synchronous compensation according to the delay measurement result. Through data encryption and redundancy verification, the accuracy of data can be realized, malicious hacker invasion is avoided, and legal risks of authorized persons are also avoided; and the playing accuracy is improved, the user experience is enhanced, and the client can be won. By carrying out delay measurement on wireless signal transmission and matching with selection of a switching wireless channel, the speed of data transmission can be guaranteed, and normal playing is guaranteed. Furthermore, the time information of the local clock module is compensated according to the time service information of the data transceiver, and synchronous compensation is carried out according to the time delay measurement result, so that not only is data transmission guaranteed, but also data playing is guaranteed, a large amount of thousands of large-scale nodes are guaranteed to play a video together from two aspects, and finally, the accurate display effect of an outdoor large-scale display or landscape lighting system is guaranteed; the problem of crosstalk between public channels is solved by automatically switching wireless channels through a channel selection module, the problem of synchronous compensation is solved by measuring wireless signal transmission delay through a delay measurement module, the problem of data transmission errors is solved by using a wireless data redundancy fault-tolerant algorithm through a data redundancy module, the problem of data protection is solved by using a wireless data encryption algorithm through a data encryption module, the problem of data interruption of a data transceiver is solved by using a local clock module to realize local accurate clock supplement in the absence of signals, the technical problems of interference, transmission delay, data fault tolerance, data encryption and the like in the wireless signal transmission process are integrally solved, the wireless signal transmission system can be used as a reliable synchronization source, a large area is cut into a plurality of local parts by combining a data communication module, the local clock module and the wireless transceiver module, and the synchronization between the areas can be realized by combining satellite time service and cutting the large area into a plurality of local parts.

In order to adapt to automatic control, improve system robustness and solve the problem that multiple devices occupy the same channel in a common frequency band radio signal, the transmitter is preferably provided with a test module, the transmitter and the receivers adopt default preset parameter packets when being powered on, the transmitter broadcasts and sends a plurality of frames of preset data to each receiver in the same subregion and receives a feedback data packet of each receiver, the test module is used for adjusting down parameters in the current preset parameter packet for retesting when the error rate in the feedback data packet exceeds a preset threshold value, and other preset parameter packets are selected as default preset parameter packets when the error rate in the retested feedback data packet exceeds the preset threshold value and the like. For example, after power-on, all devices, such as a transmitter or a data communication module, a wireless transceiver module, and the like, select the same parameters of the transceiver frequency, the transmission rate, the encoding mode, and the like, the transmitter broadcasts and transmits a plurality of frame data, then collects the error rate of the data packet of each receiver point to point, if the error rate is found to exceed a certain threshold, notifies all receivers, first reduces the transmission rate, reduces the encoding efficiency, and the like, and if the error rate still exceeds the threshold, then randomly selects the next group of parameters having the frequency, the transmission rate, the encoding mode, and the like, thereby automatically selecting a parameter packet composed of a plurality of suitable parameters, and automatically adjusting the parameters at the right time to make the used parameter packet adapt to the data transmission requirement, reduce the error rate in the data packet, and improve the robustness of the system; the function of the test module is improved, different from the existing test module, the test module integrates the system requirement for matching the preset parameter packet, when the error rate in the feedback data packet exceeds the preset threshold value, the current preset parameter packet can be adjusted together, and other preset parameter packets can be used for improving transmission, so that the data accuracy of thousands of large-scale nodes is ensured, the manual intervention is reduced, the manual intervention is not required again for the feedback result of the existing test module, the automation of the operation is realized, and the test module is very necessary for a large-scale outdoor display or landscape lighting system.

Preferably, the transmitter operates at a frequency of 410 to 533Mhz. Preferably, the transmitter operates at a frequency of 420 to 530Mhz. Preferably, the transmitter operates at a frequency of 430 to 510Mhz. Therefore, the optimal selection of 1 frequency as a communication channel in the wave band of 410-533 Mhz can be finally realized.

In order to prevent signal interruption which may occur during satellite time service and mobile data time service, the wireless transceiver module is preferably further configured to correct the time information of the local clock module according to the time service information of the data transceiver. Preferably, the time information of the local clock module is corrected once each time the time service information is obtained. Preferably, the time service information of the data transceiver is managed in a first-in first-out mode, and the time information of the local clock module is corrected by adopting the latest time service information. Therefore, when multi-region synchronization is carried out, the situation that signal interruption is possible when satellite time service and mobile data time service are considered can be realized, and at the moment, a transmitter uses a local high-precision clock as subsequent compensation to continuously time a receiver so as to eliminate accumulated deviation. The local clock module, such as an active crystal oscillator, has known precision deviation or accumulated deviation, so that the current deviation can be reduced by adopting a timing correction mode, preferably, the local wireless time service device further comprises a control module and a judgment module which are connected, the control module is also connected with a wireless transceiver module, the judgment module is also connected with the local clock module, the judgment module is used for judging whether the latest correction time of the time information of the local clock module exceeds a preset time threshold, if so, the control module controls the wireless transceiver module to wirelessly transmit the time information of the data transceiver to each receiver, and corrects the time information of the local clock module according to the time information, otherwise, the control module controls the wireless transceiver module to wirelessly transmit the time information of the local clock module to each receiver. Taking an active crystal oscillator with the precision of 10ppm as an example, the deviation of two transmitters can be controlled within 30-40 ms within 1 hour, and the continuous effectiveness precision of the scheme on satellite time service or mobile time service can be reduced to 1 hour/time, so that the frequency of satellite time service or mobile time service can be reduced.

Preferably, M is a natural number, such as 1, 2, 3, 4, 5, and the like. Preferably, M is a natural number greater than one. The area of the multi-node control system can be understood as a project area such as a project area of landscape lighting, as shown in fig. 2, in an embodiment of the present invention, when thesignal transmission area 102 of the wireless transceiver module of one transmitter is enough to cover the wholerectangular project area 101, M is 1, in this embodiment, the data transceiver can be omitted, and only the local clock module of the transmitter is used for timing each receiver. Preferably, M is a natural number equal to or greater than two and at least two sub-regions have portions overlapping each other. As shown in fig. 3, in an embodiment of the present invention, when the signal transmission area of the radio transceiver module of one transmitter is not enough to cover the entiretriangular project area 101, a plurality of transmitters are needed, and the area of the multi-node control system is set as three sub-areas including afirst sub-area 103, asecond sub-area 104 and athird sub-area 105, and the three sub-areas respectively have mutually overlapped parts. In this embodiment, three transmitters are used, and afirst sub-area 103 is shown in fig. 4 and includes a satellite signal/mobile data transceiver, a transmitter 1 and three receivers, which are a receiver 1, a receiver 2 and a receiver 3, respectively; thesecond sub-area 104, as shown in fig. 5, comprises a satellite signal/mobile data transceiver, a transmitter 2 and three receivers, receiver 4, receiver 5 and receiver 6 respectively; thethird sub-area 105, as shown in fig. 6, comprises a satellite signal/mobile data transceiver, a transmitter 3 and three receivers, receiver 7, receiver 8 and receiver 9 respectively.

As shown in fig. 7, in an embodiment of the present invention, theproject area 101 is rectangular, the area of the multi-node control system is set to eight sub-areas, including afirst sub-area 103, asecond sub-area 104, athird sub-area 105, afourth sub-area 106, afifth sub-area 107, asixth sub-area 108, aseventh sub-area 109 and aneighth sub-area 110, and a signal transmission area of each sub-area coincides with at least a signal transmission area of one other sub-area, so as to ensure that theproject area 101 is covered in a full area without leaving any empty space.

It can be seen that the present invention structurally adds transmitter components; as shown in fig. 1, the existing solution is that a satellite signal transceiver or a mobile data transceiver a is directly connected with a target receiver C, as shown in fig. 4, 5 and 6, the improved solution of the present invention divides N receivers C into M groups, each group only needs 1 transmitter B, and wireless signals are transmitted between the transmitter B and the receiver C; after the transmitter B is added, the using amount of the satellite signal transceiver or the mobile data transceiver A is less, the cost of a module of the satellite signal transceiver or the mobile data transceiver A is high, the cost of a transceiver for communication between the satellite signal transceiver or the mobile data transceiver A and the receiver C is high, the cost of a module of the transmitter B is low, and the cost of a wireless transceiver for communication between the transmitter B and the receiver C is low; wireless data communication is carried out between the transmitter B and the receiver C, the signal intensity is higher than that of satellite signals, the reliability is higher, a mobile data base station is not depended on, and networking can be carried out automatically. For a transmitter with a small project or a large communication range, the transmitter B may cover the whole project area, and at this time, even the time synchronization by the transmitter B is performed without a satellite signal transceiver or a mobile data transceiver a component.

Preferably, the number of the data transceivers is M, and each sub-area is independently provided with one data transceiver. That is to say, the regional wireless time service device of a multi-node control system comprises: m data transceivers, M transmitters and N receivers divided into M groups; setting the area of the multi-node control system into M sub-areas, wherein each sub-area is provided with a data transceiver, a transmitter and a group of receivers, and the transmitter is connected with the receivers in a wireless transmission mode; the data transceiver is used for acquiring the time service information and transmitting the time service information to the transmitter; the transmitter is provided with a data communication module, a local clock module and a wireless transceiving module, the data communication module is respectively connected with the data transceiver and the wireless transceiving module, the wireless transceiving module is connected with the local clock module and is connected with each receiver in a wireless transmission mode, the wireless transceiving module is used for wirelessly transmitting time service information to each receiver when the data transceiver has signals, and wirelessly transmitting time information of the local clock module to each receiver when the data transceiver has no signals. Preferably, the number of the data transceivers is one, and each sub-area shares one data transceiver, because the data transceivers are expensive, on the premise of ensuring accurate and effective time service, a few data transceivers can be used, so that not only can the cost be saved, but also the structure of each sub-area can be simplified.

Preferably, M is a natural number greater than or equal to three, the plurality of transmitters are distributed in a chain connection manner and are connected end to end, each transmitter is connected with two other transmitters respectively, and the signal transmission area of the wireless transceiver module of the transmitter is partially overlapped with the signal transmission area of the wireless transceiver module of the connected two other transmitters, for example, the plurality of transmitters are integrally formed into a ring. The transmitter is also provided with a time service alignment module which is used for uniformly aligning the time service information received by the data communication module, namely, a time service module is added to ensure that playing errors caused by different time service information obtained by different data transceivers are avoided; this has the added benefit that only one data transceiver can be used, saving a significant amount of expensive data transceivers.

Preferably, each sub-area is provided with one data transceiver, M data transceivers can be designed, or only one data transceiver can be adopted, and the data transceiver is used for timing to obtain accurate timing information. When the distances between the sub-areas are far and the transmission ranges of the wireless transceiver modules, namely the signal transmission areas, cannot be mutually overlapped, each sub-area needs to be independently configured with an independent data transceiver, and when the distances between the sub-areas are short and the signal transmission areas of the wireless transceiver modules can be mutually overlapped, all the sub-areas can share one data transceiver. Preferably, the number of the data transceivers is set according to the coincidence of the signal transmission areas of the wireless transceiver modules in the sub-areas, and only one data transceiver is set and shared for the sub-areas with the partially coincident signal transmission areas; and respectively arranging data transceivers for the subareas without the partial superposition of the signal transmission areas. For example, the signal transmission areas of the wireless transceiver modules in the three sub-areas are respectively partially overlapped, as shown in fig. 3, the area wireless time service device of the multi-node control system only includes one data transceiver; for example, the signal transmission areas of the wireless transceiver modules in the eight sub-areas are respectively partially overlapped, as shown in fig. 7, the local wireless time service device of the multi-node control system only includes one data transceiver; for example, in four sub-areas, the signal transmission areas of the wireless transceiving modules of two sub-areas partially coincide, and the signal transmission areas of the wireless transceiving modules of the other two sub-areas partially coincide, so that the area wireless time service device of the multi-node control system only includes two data transceivers, and so on. The method is mainly used for reducing the application cost and improving the market competitiveness.

Preferably, the multi-node control system includes the regional wireless time service device in any of the embodiments, and uses the regional wireless time service device to perform wireless time service for each sub-region. Preferably, the multi-node control system is a multi-node display control system. Preferably, the multi-node control system is applied to a landscape lighting system. Preferably, the receiver is connected with a display module, a display module or a display box body.

Preferably, the landscape lighting system comprises the multi-node control system in any one of the embodiments. Preferably, the landscape lighting system comprises a plurality of LED display boxes, LED display modules, LED lamp bars and the like. The invention can provide a time service technical scheme with better time service cost, accuracy and capability of adapting to complex environment integrally, is applied to a landscape lighting system or a multi-node control system thereof, ensures that a file is accurately played on time, and a plurality of display nodes are matched with each other to display a complete image or video, achieves a complete integral effect, is particularly suitable for combining thousands of nodes to play one video together, and has very high market application value.

Furthermore, the embodiment of the invention also comprises a multi-node control system formed by mutually combining the technical characteristics of the above embodiments, and a regional wireless time service device and a landscape lighting system thereof.

The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. An area wireless time service device of a multi-node control system is characterized by comprising: the system comprises a data transceiver, M transmitters and N receivers which are divided into M groups;

setting the area of the multi-node control system into M sub-areas, wherein each sub-area is provided with a data transceiver, a transmitter and a group of receivers, and the transmitter is connected with the receivers in a wireless transmission mode;

the data transceiver is used for acquiring the time service information and transmitting the time service information to the transmitter;

the transmitter is provided with a data communication module, a local clock module and a wireless transceiving module, the data communication module is respectively connected with the data transceiver and the wireless transceiving module, the wireless transceiving module is connected with the local clock module and is connected with each receiver in a wireless transmission mode, the wireless transceiving module is used for wirelessly transmitting time information to each receiver when the data transceiver has a signal, and wirelessly transmitting time information of the local clock module to each receiver when the data transceiver has no signal;

the transmitter is also provided with a delay measurement module which is used for carrying out delay measurement on wireless signal transmission; the wireless transceiver module is used for sending display data and time service information to each receiver in a wireless transmission mode, a time stamp is added to each frame of data of the display data, the wireless transceiver module is also used for receiving a response with the time stamp returned by each receiver, and the delay measuring module is used for measuring the delay condition of wireless signal transmission according to the display data and the response;

the transmitter is also provided with a delay compensation module which is used for carrying out synchronous compensation according to a delay measurement result so as to adjust the time service time;

the transmitter is also provided with a test module, the transmitter and the receivers adopt default preset parameter packets when being powered on, the transmitter broadcasts and sends a plurality of frames of preset data to each receiver in the same subregion and receives the feedback data packet of each receiver, the test module is used for reducing the parameters in the current preset parameter packet to perform retest when the error rate in the feedback data packet exceeds a preset threshold value, and other preset parameter packets are selected as the default preset parameter packets when the error rate in the retested feedback data packet exceeds the preset threshold value;

the data transceiver comprises a satellite signal transceiver and a mobile data transceiver; the satellite signal transceiver is used for acquiring time service information of a satellite and transmitting the time service information to the transmitter; the mobile data transceiver is used for acquiring the time service information of the mobile data signal and transmitting the time service information to the transmitter;

the transmitter is connected with each receiver in a wireless transmission mode, and symmetric algorithm encryption processing is carried out on frame data; the transmitter is also provided with a data encryption module, a data redundancy module, a local compensation module, a delay measurement module, a channel selection module and a delay compensation module; the data encryption module is used for encrypting data; the data redundancy module is used for performing data redundancy verification or data redundancy processing; the local compensation module is used for compensating the time information of the local clock module according to the time service information of the data transceiver; the time delay measurement module is used for carrying out time delay measurement on wireless signal transmission; when the delay measurement result of the delay measurement module exceeds a preset delay threshold, the channel selection module selects to switch the wireless channel; the delay compensation module is used for carrying out synchronous compensation according to the delay measurement result;

the regional wireless time service device also comprises a control module and a judgment module which are connected, the control module is also connected with a wireless transceiving module, the judgment module is also connected with a local clock module, the judgment module is used for judging whether the latest correction time of the time information of the local clock module exceeds a preset time threshold value, if so, the control module controls the wireless transceiving module to wirelessly transmit the time information of the data transceiver to each receiver, and corrects the time information of the local clock module according to the time information, otherwise, the control module controls the wireless transceiving module to wirelessly transmit the time information of the local clock module to each receiver;

the number of at least one group of receivers is different from the number of other groups of receivers; m is a natural number which is more than or equal to three, at least two subregions are provided with parts which are overlapped with each other, a plurality of transmitters are distributed in a chain connection way and are connected end to end, each transmitter is respectively connected with two other transmitters, and the signal transmission region of the wireless transceiver module of the transmitter is partially overlapped with the signal transmission regions of the wireless transceiver modules of the two other connected transmitters; and the transmitter is also provided with a time service alignment module which is used for uniformly aligning the time service information received by the data communication module.

2. The local wireless time service device of claim 1, wherein the wireless transceiver module is further configured to correct time information of the local clock module according to the time service information of the data transceiver.

3. The regional wireless time service device of claim 1, wherein the operating frequency of the transmitter is 410 to 533Mhz.

4. The regional wireless time service device of claim 1, wherein the receiver comprises a data communication module, a data recovery module and a time synchronization module which are connected in sequence.

5. A multi-node control system comprising the regional wireless time service apparatus according to any one of claims 1 to 4, wherein the regional wireless time service apparatus is used to perform wireless time service for each sub-region.

6. A landscape lighting system comprising the multi-node control system of claim 5.

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