Main beam multi-target angle resolution test system and test method

Abstract

The embodiments of the present disclosure provide a main beam multi-target angle resolution test system and test method, the system comprising: a system control machine, a radio frequency detection system, a multi-target simulation antenna, a target position simulation bracket, and a time synchronization reference communication module; wherein the system control machine is used to control each module of the system and generate a time synchronization instruction; the radio frequency detection system is used to transmit a radio frequency signal, receive an echo signal fed back by the target simulation antenna, and perform multi-target resolution; the multi-target simulation antenna is used to feed back multi-target echo signals; the target position simulation bracket is used to move the target simulation antenna to a specified position; the time synchronization reference communication module is used to achieve time synchronization between each module of the system, in this way, the multi-target resolution performance at different angles can be quantitatively evaluated, and the performance test effect of multi-target resolution in the main beam can be effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the field of radar, and in particular to the field of multi-target angle resolution technology. Background Art

[0002] The test method of the RF detection system in the laboratory field plays an important role in verifying the overall performance of the system and the effectiveness of several key technical research methods. In view of the performance verification and experimental evaluation of the multi-target resolution problem in the main beam of the RF detection system, the current test verification methods mainly carry out customized verification and experimental testing of the RF detection system for discrete positions and parameters. As for the detection performance verification of multiple targets in the main beam, since it is necessary to take into account the need to use the trajectory information of each target and the relative correlation between targets in the detection and resolution process, the performance test needs to adopt continuous and dynamic testing methods. This puts forward high requirements for the construction of the laboratory field environment of the RF detection system, scene simulation, target simulation, position simulation, synchronization between detection systems, test time delay, and scalability. Traditional test methods are very likely to cause test errors caused by asynchrony or inconsistent coordination between devices, and cannot truly reflect the performance of the new method for multi-target resolution in the main beam, which restricts the verification of the new method and the quantitative evaluation of product capability upgrades. Summary of the invention

[0003] The present invention provides a main beam multi-target angle resolution test system and test method, which fully considers the practical problems such as time synchronization, processing delay, function expansion, etc. between the simulations of various devices, and proposes a new centralized time synchronization and calibration method. Under this synchronization benchmark, the angle information of the moving multi-target scene is used to quantitatively evaluate the multi-target resolution performance at different angles.

[0004] According to a first aspect of the present disclosure, a main beam multi-target angle resolution test system is provided, the system comprising:

[0005] System control machine, radio frequency detection system, multi-target simulation antenna, target simulator, target position simulation bracket, time synchronization reference communication module; among them,

[0006] The system control machine is used to control each module of the system and generate time synchronization instructions; the radio frequency detection system is used to receive the echo signal fed back by the target simulation antenna to perform multi-target resolution; wherein the radio frequency signal has the statistical characteristics of the modulated signal; the multi-target simulation antenna is used to feed back the multi-target echo signal; the target simulator is used to generate a spatial radiation signal for evaluating the radio frequency detection system's multi-target resolution in the main beam; the target position simulation bracket is used to move the target simulation antenna to the specified position; the time synchronization reference communication module is used to achieve time synchronization between the various modules of the system.

[0007] According to the above aspects and any possible implementation manner, an implementation manner is further provided, where the multi-target simulated antenna includes:

[0008] The first target simulated antenna, the second target simulated antenna and the third target simulated antenna, wherein the first target simulated antenna is fixedly placed with the center of the radio frequency detection system antenna as a reference point, and the second target simulated antenna and the third target simulated antenna are both movable simulated antennas.

[0009] According to the aspects described above and any possible implementation method, an implementation method is further provided, in which an azimuth reference line and an elevation reference line are set with the first target simulation antenna as the center; according to the azimuth reference line and the elevation reference line, a second target simulation antenna and a third target simulation antenna are set with the outer boundary of the target position simulation bracket respectively, and the angular position is recorded in real time.

[0010] According to a second aspect of the present disclosure, a test method for a main beam multi-target angle resolution test system is provided, the method comprising:

[0011] Transmit an electromagnetic wave signal, wherein the electromagnetic wave signal has a modulation characteristic; receive an echo signal fed back after passing through two target simulation antennas; calculate the angle deviation of the two target simulation antennas based on the fed back echo signal; and evaluate the multi-target resolution performance based on the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket.

[0012] According to the above aspects and any possible implementation, an implementation is further provided, wherein the multi-target resolution performance is evaluated according to the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket, including:

[0013] According to the difference between the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket, the distance between the two target simulation antennas is continuously reduced until the angle value measured by the RF detection system is continuously 0, then the second / third target simulation antenna is stopped from being moved, and the last measured non-zero angle deviation value is used as the multi-target angle test performance in the main beam.

[0014] According to the aspects described above and any possible implementation method, an implementation method is further provided, which performs azimuth multi-target angle resolution test and elevation multi-target angle resolution test respectively to obtain the main beam multi-target azimuth angle test performance and the main beam multi-target elevation angle test performance.

[0015] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0017] Figure 1 A schematic diagram of a main beam multi-target angle resolution test system provided according to an embodiment of the present disclosure is shown;

[0018] Figure 2 A flow chart of a test method for a main beam multi-target angle resolution test provided according to an embodiment of the present disclosure is shown;

[0019] Figure 3 A flow chart of another main beam multi-target angle resolution testing method provided according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0021] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0022] Traditional testing methods are prone to test errors caused by asynchrony or inconsistent coordination between devices, and cannot truly reflect the performance of the new method in resolving multiple targets within the main beam, which restricts the verification of new methods and the quantitative evaluation of product capability upgrades.

[0023] To solve this problem, the embodiments of the present disclosure provide a main beam multi-target angle resolution test system and a test method. Specifically, a main beam multi-target angle resolution test system of a radio frequency detection system based on an improved semi-physical environment is provided, and the system includes: a system control machine, a radio frequency detection system, a multi-target simulation antenna, a target simulator, a target position simulation bracket, and a time synchronization reference communication module.

[0024] Based on this test system, a laboratory target scenario for multi-target angle resolution testing of the RF detection system is constructed. In this scenario, relying on a real RF detection system, the electromagnetic wave signal transmission, multi-target echo signal reception, and multi-target angle resolution processing are completed. The practical issues such as time synchronization, processing delay, and function expansion between the simulations of each device are fully considered, and a new centralized time synchronization and calibration method is proposed. Under this synchronization benchmark, the angle information of the moving multi-target scene is used to quantitatively evaluate the multi-target resolution performance at different angles (including pitch angles and azimuth angles).

[0025] In conjunction with the accompanying drawings, a main beam multi-target angle resolution test method for a radio frequency detection system based on an improved semi-physical environment provided by an embodiment of the present disclosure is described in detail below through specific embodiments.

[0026] Figure 1 A schematic diagram of a main beam multi-target angle resolution test system provided according to an embodiment of the present disclosure is shown. Figure 1 As shown, the main beam multi-target angle resolution test system includes:

[0027] System control machine, radio frequency detection system, multi-target simulation antenna, target simulator, environment simulator, target position simulation bracket, time synchronization reference communication module; among them,

[0028] The system control machine is used to control each module of the system and generate time synchronization instructions; the radio frequency detection system is used to receive the echo signal fed back by the target simulation antenna to perform multi-target resolution; wherein the echo signal has the statistical characteristics of the modulated signal; the multi-target simulation antenna is used to feed back the multi-target echo signal; the target simulator is used to generate the spatial radiation signal for evaluating the radio frequency detection system for multi-target resolution in the main beam; the environment simulator is used to generate the spatial radiation signal of the natural environment; the target position simulation bracket is used to move the target simulation antenna to the specified position; the time synchronization reference communication module is used to achieve time synchronization between the modules of the system.

[0029] In some embodiments, the multi-target simulated antenna includes: a first target simulated antenna, a second target simulated antenna and a third target simulated antenna, wherein the first target simulated antenna is fixedly placed with the center of the RF detection system antenna as a reference point, and the second target simulated antenna and the third target simulated antenna are both movable simulated antennas. Figure 2 A flow chart of a main beam multi-target angle resolution testing method provided according to an embodiment of the present disclosure is shown.

[0030] The first step is to build a main beam multi-target detection scenario, relying on the existing semi-physical RF detection system performance test environment to expand the time synchronization and high real-time centralized control functions.

[0031] In some embodiments, the time synchronization basic communication module is used to realize the time synchronization function. The time synchronization basic communication module can be divided into a main node and multiple sub-nodes. The main node is placed on the experimental system control machine, and the sub-nodes are deployed next to the radio frequency detection product, the target simulator, the environment simulator, and the target position simulation bracket.

[0032] The second step is to develop a time synchronization communication protocol and communication process for the multi-target resolution performance test application within the main beam.

[0033] In some embodiments, the time synchronization communication protocol is divided into a master node downlink communication protocol and a branch node uplink communication protocol.

[0034] The keywords of the master node downlink communication protocol include: sending station address (experimental system controller), receiving station address (target simulator, environment simulator, RF detection product, target position simulation bracket), start flag, end flag, and abnormal flag;

[0035] The keywords of the sub-node uplink communication protocol include: sending station address (target simulator, environment simulator, radio frequency detection product, target position simulation bracket), receiving station address (test system control machine), start flag, end flag, and abnormal flag.

[0036] In some embodiments, the time synchronization communication process is as follows: the experimental system controller acts as a communication hub and can communicate with other sub-node devices (target simulator, environmental simulator, radio frequency detection product, target position simulation bracket), and each sub-node (target simulator, environmental simulator, radio frequency detection product, target position simulation bracket) can only communicate with the experimental system controller and cannot communicate with each other.

[0037] In some embodiments, the communication cycle is set to microsecond level according to the requirements of the RF detection main beam multi-target angle resolution performance test.

[0038] The third step is to calibrate the center position of the target scene and set the azimuth and elevation reference lines.

[0039] In some embodiments, with the help of a target position simulation bracket, the center of the RF detection system antenna can be used as a reference point. On the premise of ensuring the RF detection system test clean area (assuming that the clean area length is denoted by L), a first target simulation antenna (denoted as O) can be placed, and an azimuth reference line and an elevation reference line are set with the antenna as the center to place multi-target azimuth angle performance test antennas and elevation angle performance test antennas in the main beam.

[0040] The fourth step is to set the target angle test antenna on the azimuth and elevation reference lines and complete the real-time angle marking.

[0041] In some embodiments, according to the above-mentioned azimuth and elevation reference lines, the outer boundary of the bracket is simulated with the target position, and a second target simulation antenna for azimuth angle performance test and a third target simulation antenna for elevation angle performance test are set. The length of the outer boundary of the bracket simulated at the target position is M, and the height is H.

[0042] Figure 3 A flow chart of another main beam multi-target angle resolution testing method provided according to an embodiment of the present disclosure is shown.

[0043] This method tests the multi-target angle resolution performance in the main beam of the radio frequency detection system separately in the azimuth and elevation dimensions, and the azimuth and elevation resolution operation processes are consistent. The multi-target angle test in the azimuth main beam is taken as an example for explanation.

[0044] S310, transmitting an electromagnetic wave signal, wherein the electromagnetic wave signal has a modulation characteristic.

[0045] In order to meet the requirement of multi-target resolution in the main beam, the RF detection system transmits a signal with modulation characteristics. The modulation method needs to have statistical characteristics shown mathematically, such as noise modulation under noise statistical characteristics.

[0046] The experimental system control machine, as the main communication node, can send a start-work instruction to each sub-node. After receiving the work instruction, each sub-node will power on and start up at the same time.

[0047] In some embodiments, after the radio frequency detection system is powered on, it can actively transmit an electromagnetic wave signal with modulation characteristics, wherein the modulation mode can be pseudo code phase modulation, sinusoidal frequency modulation and composite modulation. Specifically,

[0048] (1) For the statistical characteristics of the binary pseudo-random modulation sequence in pseudo-code phase modulation, its normalized autocorrelation function is

[0049]

[0050] Where τ is a time series. Its power spectrum G(f) can be expressed as

[0051]

[0052] Where P is the period of the binary pseudo-random modulation sequence, Tn is the symbol width, and δ(f) is the impulse function.

[0053] At this time, the signal transmitted by the RF detection system is expressed as

[0054]

[0055] in Satisfies the power spectrum G(f) distribution.

[0056] (2) For a sinusoidal frequency modulated transmission signal, the expression is:

[0057] s(t)=U t sin(w 0 t+m f sinw m t)

[0058] where w 0 is the carrier angular frequency, m f is the modulation coefficient, w m is the angular frequency of the modulation signal.

[0059] (3) Composite modulated transmission signal, its expression is:

[0060]

[0061] The signal complex envelope function is

[0062]

[0063] Where PN(t) is the pseudo code signal.

[0064] S320, receiving the echo signal fed back after passing through the two target simulation antennas.

[0065] In some embodiments, the electromagnetic wave signal with modulation characteristics emitted by the radio frequency detection system can feed back and output a corresponding echo signal after passing through the first target simulation antenna and the second target simulation antenna. Specifically, the echo signal expression is:

[0066] (1) For the pseudo code phase modulated RF echo signal, it can be expressed as

[0067]

[0068] Where τ is the time delay.

[0069] (2) For the sinusoidal frequency modulated echo signal, it can be expressed as

[0070] s i (t) = U r sin(w 0 (t-τ)+m f sinw m (t-τ)

[0071] The difference frequency signal after mixing is

[0072]

[0073] where w d is the Doppler angular frequency, is a fixed phase shift.

[0074] (3) The composite modulated echo signal is expressed as

[0075]

[0076] The difference frequency signal after mixing is

[0077]

[0078] S330: Calculate the angle deviation between two target simulated antennas according to the feedback echo signal.

[0079] In some embodiments, the signal is received and processed by the radio frequency detection system, and the azimuth angle deviation of the first target simulated antenna and the second target simulated antenna can be calculated, which is recorded as η. 1 . In some embodiments, based on the statistical characteristics of the modulation signal, the energy deviation of the target energy concentration center in the pitch direction and the azimuth direction is calculated; including: using the statistical method corresponding to the statistical characteristics of the modulation signal to perform capacity statistics on the pitch difference path digital signal and the azimuth difference path digital signal, respectively, to calculate the energy deviation of the target energy concentration center in the pitch direction and the azimuth direction. The pitch energy deviation is compared with the energy center point of the sum path signal, and the angle calculation method of the sum-difference ratio is used to obtain the pitch target angle deviation value under the statistical characteristics; the azimuth energy deviation is compared with the energy center point of the sum path signal, and the angle calculation method of the sum-difference ratio is used to obtain the azimuth target angle deviation value under the statistical characteristics. In summary, the calculation result can obtain the angle deviation value of the two targets.

[0080] S340, evaluating the multi-target resolution performance according to the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket.

[0081] In some embodiments, since the position of the first target simulated antenna is consistent with the position of the center of the RF detection system antenna, its azimuth angle is recorded as 0 degrees; the position coordinates of the second target simulated antenna are (M / 2, 0), and the corresponding actual azimuth angle can be obtained by the target position simulation bracket feedback, recorded as θ 1 At this time, the actual angle deviation between the first target simulated antenna and the second target simulated antenna in the azimuth direction can be obtained as θ 1 -0 = θ 1 .

[0082] In some embodiments, the calculated azimuth angle deviation η is 1 The azimuth angle deviation θ obtained from the simulated bracket feedback at the target position 1 After comparison, we can get that the measurement error of the azimuth angle of multiple targets by the radio frequency detection system is η 1 -θ1 .

[0083] Further, according to the obtained measurement error η 1 -θ 1 , continuously reducing the distance between the two target simulation antennas. Specifically,

[0084] The RF detection system converts the measurement error η 1 -θ 1 The signal is uploaded to the main node through communication. After receiving the signal, the main node sends a start moving instruction to the target simulation bracket sub-node.

[0085] After receiving the start moving command, the target simulation bracket sends a command confirmation signal to the main node and starts to move the second target simulation antenna at the same time. At this time, the azimuth angle deviation between the first target simulation antenna and the second target simulation antenna can be fed back through the target simulation bracket, and this deviation is used as the azimuth angle deviation of the real target scene. The radio frequency detection system can calculate the azimuth angle deviation of the two targets measured by the system. After comparing the two deviations, the azimuth multi-target angle measurement deviation value obtained by laboratory measurement as the second target simulation antenna moves can be obtained; and the measurement deviation value is sent to the main node in real time through communication.

[0086] In some embodiments, the second target simulation antenna is continuously moved, and when the angle deviation of the second target simulation antenna relative to the first target simulation antenna is exactly equal to half of the main beam angle of the radio frequency detection system transmitting signal, the azimuth angle deviation fed back by the target simulation bracket and the azimuth angle deviation obtained after the radio frequency detection system is measured and calculated are recorded, and the distance between the second target simulation antenna and the first target simulation antenna is continuously reduced until the angle value measured by the radio frequency detection system is continuously 0, and the second target simulation antenna is stopped from being moved. The last measured azimuth angle deviation value that is not 0 is recorded as the multi-target azimuth angle test performance in the main beam of the radio frequency detection system at this time.

[0087] In some embodiments, in order to obtain the multi-target elevation angle test performance in the main beam of the radio frequency detection system, the second target simulation antenna can be replaced with a third target simulation antenna and the above test process can be repeated.

[0088] According to the embodiments of the present disclosure, the following technical effects are achieved:

[0089] The angular resolution characteristics of the radio frequency detection platform for multiple targets have been improved, and the resolution of multiple targets has been completed with low consumption and high efficiency without changing the current system of the radio frequency detection platform.

[0090] The algorithm has a small calculation overhead when superimposing the statistical characteristics of the echo signal, which improves the efficiency of the RF detection platform in performing statistical calculations on three-channel digital echo signals, so that it can be run and transplanted on hardware platforms with limited computing power, expanding its scope of application.

[0091] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0092] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0093] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A main beam multi-target angle resolution test system, include: System control machine, radio frequency detection system, multi-target simulation antenna, target simulator, target position simulation bracket, time synchronization reference communication module; wherein, the multi-target simulation antenna includes a first target simulation antenna, a second target simulation antenna and a third target simulation antenna; The system control machine is used to control each module of the system and generate time synchronization instructions; The radio frequency detection system is used to receive the echo signal fed back by the target simulation antenna to perform multi-target resolution; wherein the echo signal has a modulated signal statistical characteristic; and is also used to transmit an electromagnetic wave signal, receive the echo signal fed back after passing through the first target simulation antenna and the second / third target simulation antenna, calculate the angle deviation between the first target simulation antenna and the second / third target simulation antenna according to the fed back echo signal, and evaluate the multi-target resolution performance according to the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket; wherein the electromagnetic wave signal has a modulation characteristic; The multi-target simulation antenna is used to feed back multi-target echo signals; The target simulator is used to generate a spatial radiation signal for evaluating the radio frequency detection system for multi-target resolution in the main beam; The target position simulation bracket is used to move the target simulation antenna to a specified position; The time synchronization reference communication module is used to achieve time synchronization between various modules of the system.

2. The system according to claim 1, It is characterized in that The first target simulated antenna is fixedly placed with the center of the radio frequency detection system antenna as a reference point, and the second target simulated antenna and the third target simulated antenna are both movable simulated antennas.

3. The system according to claim 2, It is characterized in that The system further comprises: An azimuth reference line and an elevation reference line are set with the first target simulated antenna as the center; According to the azimuth reference line and the elevation reference line, a target second target simulation antenna and a third target simulation antenna are set with the target position simulation bracket outer boundary respectively, and the angle position is recorded in real time.

4. The system according to claim 1, It is characterized in that The evaluating the multi-target resolution performance according to the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket includes: According to the difference between the calculated angle deviation and the actual angle deviation fed back by the target simulation bracket, the distance between the second / third target simulation antenna and the first target simulation antenna is continuously reduced until the angle value measured by the RF detection system is continuously 0, and the second / third target simulation antenna is stopped from being moved, and the last measured non-zero angle deviation value is used as the multi-target angle test performance in the main beam.

5. The main beam multi-target angle resolution test method of the system according to claim 1, It is characterized in that Applied to a radio frequency detection system, the method comprises: The azimuth multi-target angle resolution test and the elevation multi-target angle resolution test are carried out respectively to obtain the main beam multi-target azimuth angle test performance and the main beam multi-target elevation angle test performance.

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