技术领域technical field
本发明属于目标探测领域，具体属于雷达系统领域。The invention belongs to the field of target detection, in particular to the field of radar systems.
背景技术Background technique
雷达是探测地面、海上、空中、临近空间与空间目标的重要设备。雷达的分类方法很多，按照雷达波束照射目标方式，可以分为三种：一是雷达波束指向目标，雷达波束随着目标的运动而运动，如对空监视雷达；二是雷达波束指向某个区域，雷达波束随着平台的运动而运动，如天基雷达；三是雷达波束指向某个方向，雷达波束不动而等待目标穿越，如电子篱笆。当然，也包括上述两种以上方式的组合，但归根结底就是两类：波束扫描雷达与波束驻留雷达。其中，波束扫描雷达探测范围受限于波束宽窄、波束扫描空间范围、扫描时间范围，也受限于目标机动能力；波束驻留雷达探测范围受限于波束宽度范围与雷达部署的地理位置。Radar is an important device for detecting ground, sea, air, near space and space targets. There are many classification methods of radar. According to the way the radar beam illuminates the target, it can be divided into three types: one is that the radar beam points to the target, and the radar beam moves with the movement of the target, such as air surveillance radar; the other is that the radar beam points to a certain area , the radar beam moves with the movement of the platform, such as space-based radar; the third is that the radar beam points to a certain direction, and the radar beam does not move while waiting for the target to pass through, such as an electronic fence. Of course, it also includes the combination of the above two or more methods, but in the final analysis, there are two types: beam-scanning radar and beam-dwelling radar. Among them, the detection range of the beam scanning radar is limited by the beam width, the beam scanning space range, the scanning time range, and the target maneuverability; the beam resident radar detection range is limited by the beam width range and the geographical location of the radar deployment.
无论是波束扫描雷达与波束驻留雷达，本质上都是目标要处在雷达波束内，才具备目标探测的基本条件，因此，实质上现有雷达存在的上述问题是受雷达波束照射目标空间范围限制。由此，转变雷达波束照射目标方式的理念，采取雷达波束对感兴趣空间全覆盖的设计思想，发明了天眼探测系统。Whether it is a beam-scanning radar or a beam-dwelling radar, the basic condition for target detection is essentially that the target must be within the radar beam. Therefore, the above-mentioned problem existing in existing radars is that the spatial range of the target irradiated by the radar beam is limit. As a result, the concept of radar beam irradiation on the target was changed, and the design idea of radar beam covering the space of interest was adopted, and the sky eye detection system was invented.
发明内容Contents of the invention
为解决现有雷达存在的上述问题，实现即插即用式的目标探测，发明了天眼探测系统。In order to solve the above-mentioned problems existing in existing radars and realize plug-and-play target detection, the sky-eye detection system was invented.
S1，天眼探测系统概念与设计思想S1, the concept and design idea of the sky eye detection system
天眼探测系统，也称为天基电子篱笆、电子瀑布或电子锥，是指以中轨、高轨与大椭圆轨道平台为基础，搭载具有一定方向性与秘钥的电磁能量发射系统，利用搭载平台高度高而覆盖范围广的特点，实现发射波束对地面、海上、空中、临近空间与太空感兴趣的区域形成全天时广域无缝覆盖，照射在该区域的目标上形成反射信号；以地面、海上、空中、临近空间与低轨道太空平台为基础，搭载球面天线或等效球面的共形天线，利用球面天线具有全向性、且各方向增益相同的特点，实现接收波束对探测区域的无扫描全向无缝覆盖，接收目标的反射信号。以收、发分离的方式实现目标探测，以群目标跟踪原理实现探测区域所有目标的态势认知。应用于静止或运动的地面目标、海上目标、空中目标的探测，也可应用于临近空间目标、轨道目标与弹道目标的探测。其中，天眼中的“天”是指天基或在太空部署发射分系统的含义，“眼”是指像眼睛一样观察大范围的含义；探测是指对目标的发现、区分、识别与跟踪，探测系统是指实现这些功能的软件与硬件的集合；中、高轨是指轨道高度距离海平面18000公里以上的高度，低轨是指轨道高度距离海平面3000公里以下的高度；群目标跟踪原理详见耿文东为第一作者的专著《群目标跟踪》，2014年1月国防工业出版社公开出版。天眼探测系统原理如图1所示。The sky-eye detection system, also known as space-based electronic fence, electronic waterfall or electronic cone, refers to the platform based on medium orbit, high orbit and large elliptical orbit, equipped with an electromagnetic energy emission system with certain directionality and secret key. The characteristics of high platform height and wide coverage enable the transmitting beams to form all-time wide-area seamless coverage of areas of interest on the ground, sea, air, near space, and space, and irradiate targets in this area to form reflected signals; Based on the ground, sea, air, near space and low orbit space platforms, it is equipped with a spherical antenna or a conformal antenna equivalent to a spherical surface. The spherical antenna has the characteristics of omnidirectionality and the same gain in all directions, so as to realize the detection area of the receiving beam. The non-scan omnidirectional seamless coverage, receiving the reflected signal of the target. Realize target detection by separating receiving and sending, and realize situational awareness of all targets in the detection area by the principle of group target tracking. It is applied to the detection of static or moving ground targets, sea targets, and air targets, and can also be applied to the detection of adjacent space targets, orbital targets and ballistic targets. Among them, the "sky" in the eye of the sky refers to the meaning of space-based or deploying launch subsystems in space, and the "eye" refers to the meaning of observing a large area like an eye; detection refers to the discovery, distinction, identification and tracking of targets, The detection system refers to the collection of software and hardware to realize these functions; the medium and high orbits refer to the height of the orbit above 18,000 kilometers from the sea level, and the low orbit refers to the height of the orbit below 3,000 kilometers from the sea level; the principle of group target tracking For details, see Geng Wendong's monograph "Group Target Tracking", which was published by National Defense Industry Press in January 2014. The principle of the Sky Eye detection system is shown in Figure 1.
概言之，天眼探测系统就是利用发射波束对感兴趣区域的无扫描全天时广域无缝覆盖，接收波束对探测区域的无扫描全向无缝覆盖，通过目标在发射波束与接收波束中的不间断连续穿越，采用收发分离方式实现目标探测，利用群目标跟踪原理实现探测区域内多目标的态势认知，使得用户仅需携带接收系统就可以获得全天时即插即用式的目标探测服务与态势认知服务，且一体化同时实现。In a nutshell, the sky-eye detection system uses the non-scanning all-time wide-area seamless coverage of the region of interest by the transmitting beam, and the non-scanning omnidirectional seamless coverage of the detection area by the receiving beam. The uninterrupted continuous traversal, the separation of sending and receiving is used to realize target detection, and the principle of group target tracking is used to realize the situational awareness of multiple targets in the detection area, so that users only need to carry the receiving system to obtain all-day plug-and-play targets Detection service and situational awareness service, and the integration is realized at the same time.
S2，天眼探测系统功能S2, Sky Eye detection system function
一是地面、海面静止目标的三坐标位置测量能力，以及三维地理信息获取能力；One is the ability to measure the three-coordinate position of static targets on the ground and sea, and the ability to obtain three-dimensional geographic information;
二是地面、海上运动目标的三坐标位置测量能力；The second is the three-coordinate position measurement capability of ground and sea moving targets;
三是空中目标、临近空间目标、轨道目标与弹道目标的三坐标测量能力；The third is the three-coordinate measurement capability of air targets, near space targets, orbital targets and ballistic targets;
四是地面、海面静止目标和低速运动目标的成像能力；The fourth is the imaging capability of stationary targets and low-speed moving targets on the ground and sea;
五是空中、临近空间、轨道与弹道运动目标的成像能力；The fifth is the imaging capability of air, near space, orbital and ballistic moving targets;
六是探测区域范围内的目标态势认知能力。The sixth is the ability to detect target situational awareness within the area.
上述功能既可以同时实现，也可以仅实现一种或同时实现几种。The above functions can be realized simultaneously, only one kind or several kinds can be realized simultaneously.
S3，天眼探测系统组成S3, composition of sky eye detection system
由发射与天线分系统、球面透镜式接收天线分系统、接收与信息处理分系统三大部分组成。It consists of three parts: the transmitting and antenna subsystem, the spherical lens type receiving antenna subsystem, and the receiving and information processing subsystem.
S31，发射机与发射天线分系统S31, Transmitter and transmitting antenna subsystem
由时钟、编码与同步、功率产生与平台子系统组成。平台部署的典型轨道是静止轨道、中轨轨道与大椭圆轨道，中、高轨与大椭圆轨道三种部署方案既可以单独使用，也可以组合使用。其中，平台的大椭圆轨道部署，目的是更好的覆盖高纬度地区与地球两极地区。其中，编码与同步子系统同时具有发射信号加密功能。该分系统组成如图2所示。Consists of clock, encoding and synchronization, power generation and platform subsystems. The typical orbits for platform deployment are geostationary orbit, medium orbit and large elliptical orbit. The three deployment schemes of medium, high orbit and large elliptical orbit can be used alone or in combination. Among them, the large elliptical orbit of the platform is deployed to better cover high-latitude regions and the earth's polar regions. Among them, the encoding and synchronization subsystem also has the function of transmitting signal encryption. The composition of the subsystem is shown in Figure 2.
其中，对于中轨高度平台的发射分系统，需要采取组网方式实现大区域覆盖；高轨主要是指地球同步轨道，也称为静止轨道，一般单平台即可实现大区域覆盖；大椭圆轨道平台应用于高纬度与南北两极地区的覆盖。无论是中轨平台、高轨平台，还是大椭圆轨道平台，相较于目前的低轨道平台雷达系统来说，都具有发射信号过境照射时间长、与地球相对运动速度低特点，尤其是静止轨道平台相对于地球静止，为目标运动补偿、发射信号捕获带来了诸多方面的优势。Among them, for the launch subsystem of the medium-orbit altitude platform, it is necessary to adopt a networking method to achieve large-area coverage; high-orbit mainly refers to geosynchronous orbit, also known as geostationary orbit, and generally a single platform can achieve large-area coverage; The platform is used for coverage in high latitudes and polar regions. Whether it is a medium-orbit platform, a high-orbit platform, or a large elliptical orbit platform, compared with the current low-orbit platform radar system, they all have the characteristics of long transmission signal transit irradiation time and low relative motion speed with the earth, especially in geostationary orbit. The platform is stationary relative to the earth, which brings many advantages for target motion compensation and emission signal capture.
S32，球面接收天线分系统S32, spherical receiving antenna subsystem
采用球面接收天线，包括专用天线与兼用天线两种。其中，专用天线采用球面天线，搭载在建筑物、飞机、舰船、临近空间飞行器、卫星与地面车辆平台上；兼用天线采用民用建筑物，岛礁建筑物，钻井平台，飞机、临近空间飞行器、舰艇外表面的共形天线。该分系统组成如图3所示。Spherical receiving antennas are used, including special antennas and dual-purpose antennas. Among them, the special antenna adopts a spherical antenna, which is mounted on buildings, aircraft, ships, near-space vehicles, satellites and ground vehicle platforms; Conformal antennas on the outer surface of a ship. The composition of the subsystem is shown in Figure 3.
S33，接收与信息处理分系统S33, receiving and information processing subsystem
接收与信息处理系统由相关接收机、信号处理、数据处理与数据录取、数据传输与分发、频率与时间同步子系统，以及平台子系统组成。其中，参考信号是指接收或预存在相关接收机子系统内的发射信号，反射信号是指发射信号照射在目标表面的反射信号；数据处理子系统根据群目标跟踪原理实现探测区域内多目标态势认知，能够很好地降低指控系统的复杂程度，利于其瘦身。该分系统组成如图4所示。The receiving and information processing system consists of related receivers, signal processing, data processing and data acquisition, data transmission and distribution, frequency and time synchronization subsystems, and platform subsystems. Among them, the reference signal refers to the transmitted signal received or pre-stored in the relevant receiver subsystem, and the reflected signal refers to the reflected signal of the transmitted signal irradiated on the target surface; the data processing subsystem realizes multi-target situation recognition in the detection area according to the principle of group target tracking. It is well known that it can reduce the complexity of the accusation system and help it lose weight. The composition of the subsystem is shown in Figure 4.
上述所有平台子系统均包含供电子系统。All of the above platform subsystems include the power supply subsystem.
S4，接收平台部署原则与方案S4, receiving platform deployment principles and solutions
S41，接收平台部署原则S41, receiving platform deployment principles
一是低看高的原则，也就是部署位置低的接收平台用于探测相较于该平台位置高的目标。例如，地面、海面接收平台所搭载接收系统用于探测空中、临近空间或太空目标。One is the principle of looking low and looking high, that is, deploying a receiving platform with a low position to detect targets that are higher than the platform. For example, receiving systems mounted on ground and sea receiving platforms are used to detect air, near space or space targets.
一是高看低的原则，也就是部署位置高的接收平台用于探测相较于该平台位置低的目标。例如，空中平台所搭载接收系统用于探测地面、海面目标。One is the principle of looking high and looking low, that is, deploying a receiving platform with a high position is used to detect targets that are low compared to the platform. For example, the receiving system carried by the air platform is used to detect ground and sea targets.
S42，接收平台的部署方案S42, receiving a deployment scheme of the platform
接收平台的部署方案，一是取决于用户所希望探测区域的范围，所希望探测区域的范围越大，则接收平台部署的位置越高，所需要部署的接收系统越多；二是取决于定位方法，采取多发单收的定位方法，则一套接收分系统即可实现目标定位，适用于飞机、卫星负载能力有限的运动平台；采取单发多收的定位方法，则需要两个以上的接收分系统才能够实现目标定位，适用于地面、岛礁、舰船作为平台的接收分系统；采用多发多收的定位方法，则需要两个以上的发射分系统与接收分系统，适用于高精度需求的用户。其中，多发单收是指两个以上的发射分系统与一个接收分系统，单发多收是指一个发射分系统与两个以上的接收分系统，多发多收是指两个以上的发射分系统与两个以上的接收分系统。The deployment plan of the receiving platform depends on the range of the user's desired detection area. The larger the range of the desired detection area, the higher the location of the receiving platform and the more receiving systems that need to be deployed; the second depends on the positioning method, adopting the positioning method of multiple transmission and single reception, a set of receiving subsystems can realize target positioning, which is suitable for motion platforms with limited load capacity of aircraft and satellites; adopting the positioning method of single transmission and multiple reception, more than two receiving subsystems are required The target positioning can only be achieved by the subsystem, which is suitable for the receiving subsystem of the ground, island reef, and ship as the platform; if the multi-transmission and multi-reception positioning method is used, more than two transmitting subsystems and receiving subsystems are required, which is suitable for high-precision users who need it. Among them, multiple transmission and single reception refers to more than two transmission subsystems and one reception subsystem, single transmission and multiple reception refers to one transmission subsystem and more than two reception subsystems, multiple transmission and multiple reception refers to more than two transmission subsystems system with more than two receiving subsystems.
S5，发射信号直达波抑制方法S5, the method of suppressing the direct wave of the transmitted signal
发射信号直达波是指来自于发射分系统的发射信号直接通过天线进入接收分系统的发射信号，因其相较于目标反射信号的信号强度大，因此需要对其进行抑制。采取的抑制措施就是通过目标探测方向背向发射信号方向的方法，即发射波束指向方向的区域不作为探测区域，使其无法进入接收机，以此达到抑制直达波的目的。The direct wave of the transmitting signal refers to the transmitting signal from the transmitting subsystem directly entering the receiving subsystem through the antenna. Because it has a higher signal strength than the target reflected signal, it needs to be suppressed. The suppression measure adopted is to use the method that the detection direction of the target is opposite to the direction of the transmission signal, that is, the area where the transmission beam points in the direction is not used as the detection area, so that it cannot enter the receiver, so as to achieve the purpose of suppressing the direct wave.
另外，还可以采取接收信号增强措施：一是长时间信号积累方案。发射波束覆盖范围广的特点，使得目标长时间运动在波束内，因此天眼探测系统具备反射信号信号长时间积累的条件。二是接收天线组阵方案。地面、岛礁、舰船平台具有承载能力强、稳定性好的特点，因此，接收分系统可以采用天线组阵技术来实现增强信号。In addition, you can also take measures to enhance the received signal: First, the long-term signal accumulation program. The wide coverage of the transmitting beam makes the target move in the beam for a long time, so the Sky Eye detection system has the conditions for long-term accumulation of reflected signals. The second is the receiving antenna array scheme. The ground, island reefs, and ship platforms have the characteristics of strong carrying capacity and good stability. Therefore, the receiving subsystem can use antenna array technology to achieve signal enhancement.
本发明具有以下有益效果：The present invention has the following beneficial effects:
一是颠覆了传统雷达天线需要机械扫描或电子扫描的概念。由于天基发射平台高度高而使得发射波束能够覆盖更大区域，不仅无需波束扫描就能够满足大范围覆盖要求，而且改善了机械扫描或电子扫描这种电磁能量辐射方式的非连续性，因此颠覆了传统雷达波束扫描的概念。One is to subvert the concept that traditional radar antennas require mechanical scanning or electronic scanning. Due to the high height of the space-based launch platform, the launch beam can cover a larger area, not only can meet the wide-area coverage requirements without beam scanning, but also improves the discontinuity of electromagnetic energy radiation methods such as mechanical scanning or electronic scanning, thus subverting The concept of traditional radar beam scanning is improved.
二是颠覆了传统雷达接收天线随动指向目标的概念。由于采用了球面天线而使得接收天线具有全向性，且具有相同的天线增益，因此无需接收天线指向目标。The second is to subvert the concept of the traditional radar receiving antenna following the target. Due to the use of a spherical antenna, the receiving antenna is omnidirectional and has the same antenna gain, so there is no need for the receiving antenna to point to the target.
三是颠覆了机动目标跟踪的概念。发射波束的广域性与接收波束的全向性，相当于目标始终运动不间断连续地运动在发射波束与接收波束内，因此大大降低了目标跟踪系统对目标机动模型的要求。The third is to subvert the concept of maneuvering target tracking. The wide-area nature of the transmitting beam and the omnidirectionality of the receiving beam mean that the target always moves uninterrupted and continuously in the transmitting beam and the receiving beam, thus greatly reducing the requirements of the target tracking system for the target maneuvering model.
四是能够提供目标探测的即插即用式服务。由于发射波束始终覆盖监视区域，任何出现在该区域的目标就会产生回波信号，只要接收系统开机工作，就像收音机一样随时可以接收目标信号。Fourth, it can provide plug-and-play service for target detection. Since the transmitting beam always covers the monitoring area, any target appearing in this area will generate an echo signal. As long as the receiving system is turned on and working, it can receive the target signal at any time just like a radio.
五是颠覆了目标跟踪与态势认知分离实现的概念，实现了目标探测与态势认知的一体化。由于监视区域内所有目标均在发射波束内与接收波束内，因此，能够同时实现目标跟踪与态势认知，且能够生成满足不同用户需求的通用态势图。The fifth is to subvert the concept of separation of target tracking and situational awareness, and realize the integration of target detection and situational awareness. Since all targets in the monitoring area are within the transmitting beam and receiving beam, it can realize target tracking and situational awareness at the same time, and can generate a general situational map that meets the needs of different users.
六是颠覆了传统雷达侦察监视范围与侦察监视时间受限于平台高度、平台运动、平台滞空时间问题。例如，地基雷达受限于平台高度，低轨平台天基雷达就受限于其过境时间，空基雷达受限于滞空时间与高度。The sixth is to subvert the traditional radar reconnaissance and surveillance range and reconnaissance and surveillance time are limited by platform height, platform movement, and platform airborne time. For example, ground-based radar is limited by the height of the platform, low-orbit platform space-based radar is limited by its transit time, and space-based radar is limited by the time and height of the airborne.
七是成为了与世界交往、融合的又一个窗口。其作用类似于全球导航定位系统，具有通过性与全球性。由于发射信号采用秘钥，使得用户的使用权具有可控性而可收费使用，因而也具有经济性。同时，可以大大减少全球雷达数量，是其经济性的又一种表现形式，进而也使得电磁环境更加洁净、电磁频谱管理更加简单。Seventh, it has become another window for communication and integration with the world. Its function is similar to that of the global navigation and positioning system, which is passable and global. Since the transmission signal uses a secret key, the user's right to use is controllable and can be used for a fee, so it is also economical. At the same time, it can greatly reduce the number of radars in the world, which is another manifestation of its economy, which in turn makes the electromagnetic environment cleaner and the management of the electromagnetic spectrum easier.
概言之，本发明具有重大的推广价值，应用前景十分广阔。In a word, the present invention has great popularization value and broad application prospect.
附图说明Description of drawings
图1天眼探测系统原理示意图Figure 1 Schematic diagram of the principle of sky eye detection system
图2发射机与发射天线框图Figure 2 Transmitter and transmitting antenna block diagram
图3接收天线示意图Figure 3 Schematic diagram of receiving antenna
图4接收与信息处理分系统组成框图Figure 4 Block Diagram of Receiving and Information Processing Subsystem
图5颗静止轨道卫星平台部署示意图Figure 5 Schematic diagram of geostationary satellite platform deployment
图6天眼探测系统威力仿真结果Figure 6 Simulation results of the power of the Sky Eye detection system
具体实施方式detailed description
以地球同步轨道，即静止轨道卫星为发射系统平台为例，对本发明作进一步说明。Taking geosynchronous orbit, that is, satellite in geostationary orbit as the launch system platform as an example, the present invention will be further described.
1)发射分系统设计1) Launch subsystem design
采用3颗静止轨道卫星平台，部署在东经95°、115°与135°，静止轨道标称高度取35786公里，对应覆盖范围为3122公里的区域，如果发射天线中心赤道，则以赤道为中心形成了3122公里宽的一条电子倒篱笆带。如图5所示。Using 3 geostationary orbit satellite platforms, deployed at 95°, 115° and 135° east longitude, the nominal altitude of the geostationary orbit is 35,786 kilometers, corresponding to an area with a coverage of 3,122 kilometers, if the center of the transmitting antenna is the equator, it will be formed centered on the equator An electronic inverted fence strip 3122 kilometers wide. As shown in Figure 5.
发射信号设计为X频段扩频体制，码长周期取1毫秒，当取频率10GHz时对应波长为3厘米时，对应天线半功率点波束宽度取5°，对应天线增益为31.2dB。发射功率取1500瓦，对应31.8dBw。The transmission signal is designed as an X-band spread spectrum system, and the code length period is 1 millisecond. When the frequency is 10 GHz, the corresponding wavelength is 3 cm, the corresponding antenna half-power point beam width is 5°, and the corresponding antenna gain is 31.2 dB. The transmit power is taken as 1500 watts, which corresponds to 31.8dBw .
2)接收天线设计2) Receiving antenna design
接收天线设计为X频段球面天线，取直径10米，对应天线增益为59.4dB。The receiving antenna is designed as an X-band spherical antenna with a diameter of 10 meters, and the corresponding antenna gain is 59.4dB.
3)接收机设计3) Receiver design
采用X频段扩频信号相关接收机，灵敏度取-159.5dBw。Using X-band spread spectrum signal correlation receiver, the sensitivity is -159.5dBw .
4)平台部署方案确定4) Determine the platform deployment plan
按照单发双收定位方法，采用双海基平台搭载接收天线与接收分系统的方案。According to the positioning method of single transmission and double reception, the scheme of dual sea-based platforms equipped with receiving antennas and receiving subsystems is adopted.
5)探测能力分析5) Detection capability analysis
根据双基地雷达方程，可得卫星平台发射信号到达空间某点的功率密度为：According to the bistatic radar equation, the power density of the signal transmitted by the satellite platform to a certain point in space can be obtained as:
式中，St，PT，GT，Rt，LA分别为发射信号在空间某点功率密度、发射功率、发射天线增益与其到空间某点距离及发射信号传输的损耗。目标反射信号到达接收机的功率密度为：In the formula, St , PT , GT ,Rt, and LA are the power density of the transmitted signal at a certain point in space, the transmitted power, the gain of the transmitting antenna and its distance to a certain point in space, and the transmission loss of the transmitted signal. The power density of the target reflected signal reaching the receiver is:
式中σT，Rr分别为目标有效散射面积及其到接收机的距离。接收天线有效面积为：where σT and Rr are the effective scattering area of the target and its distance to the receiver, respectively. The effective area of the receiving antenna is:
式中Ae，GR，λ，fR分别为接收天线有效面积、天线增益、信号波长与接收天线方向性系数。故此，将上述各式综合整理，并且忽略接收天线方向性系数和发射信号路径大气损耗可得接收功率方程为：In the formula, Ae , GR , λ, and fR are the effective area of the receiving antenna, the antenna gain, the signal wavelength and the directivity coefficient of the receiving antenna, respectively. Therefore, by synthesizing the above formulas and ignoring the directivity coefficient of the receiving antenna and the atmospheric loss of the transmitting signal path, the received power equation can be obtained as:
按照双基地雷达公式，可得：According to the bistatic radar formula, we can get:
取100秒积累时间，可以得到探测目标不同反射面积与探测距离的关系如图6所示。Taking the accumulation time of 100 seconds, the relationship between the different reflection areas of the detection target and the detection distance can be obtained, as shown in Figure 6.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027669.3ACN106772242A (en) | 2017-01-09 | 2017-01-09 | Its eye detection system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027669.3ACN106772242A (en) | 2017-01-09 | 2017-01-09 | Its eye detection system |
| Publication Number | Publication Date |
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| CN106772242Atrue CN106772242A (en) | 2017-05-31 |
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| CN201710027669.3AWithdrawnCN106772242A (en) | 2017-01-09 | 2017-01-09 | Its eye detection system |
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| Publication | Publication Date | Title |
|---|---|---|
| Macnamara | Introduction to antenna placement and installation | |
| Rao | GPS/GNSS Antennas | |
| Willis | Bistatic radar | |
| US8373591B2 (en) | System for sensing aircraft and other objects | |
| Yin et al. | Integrated sensing and communications enabled low earth orbit satellite systems | |
| Fourikis | Advanced array systems, applications and RF technologies | |
| Stove et al. | Passive maritime surveillance using satellite communication signals | |
| Sadeghi et al. | Maritime target localization from bistatic range measurements in space-based passive radar | |
| CN101692128A (en) | Synthetic aperture imaging method based on geostationary and geosynchronous orbit satellites | |
| Zuo | Bistatic synthetic aperture radar using GNSS as transmitters of opportunity | |
| US20240134061A1 (en) | Systems and Methods for a Global Positioning System using GNSS Signals and Stokes Parameters | |
| Jędrzejewski et al. | Passive Space Object Observation using LOFAR Radio Telescope and Software-defined Radio Receiver | |
| Blázquez‐García et al. | Capabilities and challenges of passive radar systems based on broadband low‐Earth orbit communication satellites | |
| CN104678418A (en) | Multi-satellite GNSS-R sea-surface target positioning ambiguity eliminating method | |
| Wachtl et al. | Global navigation satellite systems in passive surveillance applications | |
| Friedman et al. | Angle-of-arrival assisted radio interferometry (ARI) target localization | |
| Frazer et al. | Mode-selective OTHR: A new cost-effective sensor for maritime domain awareness | |
| Maoyi et al. | Feasibility of Starlink transmissions for passive airborne targets detection | |
| Barott et al. | A passive bistatic radar for detection of aircraft using spaceborne transmitters | |
| Ortner et al. | Geospatial guidance of unmanned aerial vehicles around no-fly-zones by global positioning system spoofing | |
| Jędrzejewski et al. | Bistatic Detection of LEO Satellites from Very Long Distances Using LOFAR Radio Telescope | |
| CN106772242A (en) | Its eye detection system | |
| Cherniakov et al. | Passive bistatic SAR with GNSS transmitters | |
| Rivkin | Navigation without GPS | |
| Rathinam et al. | Effective utilization of space service volume through combined GNSS |
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