A method for quantitatively evaluating performance of motorized platform radar cooperative detection against jamming

Abstract

The application discloses a kind of motorized platform radar cooperative detection anti jamming interference performance quantification evaluation method: step 1, determine anti-interference performance benchmark scene, calculate the signal-to-interference ratio received by single radar under anti-interference performance benchmark scene;Step 2, determine the scene to be evaluated, and calculate the signal-to-interference ratio of each radar;Step 3, according to the signal-to-interference ratio of each radar and the signal-to-interference ratio received by single radar under benchmark scene, calculate the anti-interference performance improvement degree of each radar;Step 4, according to the anti-interference performance improvement degree of each radar, calculate the anti-interference performance improvement degree of radar system in the scene to be evaluated.The method of the application defines the anti-interference capability improvement degree, evaluates the anti-interference performance of single machine and system from the angle of signal-to-interference ratio, improves the accuracy of evaluation result, so that the evaluation result is more reliable.

Description

Technical Field

[0001] This invention belongs to the field of radar detection technology, specifically relating to a quantitative evaluation method for the anti-suppression and interference performance of mobile platform radar cooperative detection. Background Technology

[0002] With the continuous development of radar technology, mobile platform cooperative detection radar has become an important branch of modern radar systems. Compared with traditional centralized radar, mobile platform cooperative detection radar, by deploying multiple radar nodes on aircraft or other flight platforms, can achieve more flexible detection and stronger anti-jamming capabilities. However, in complex electromagnetic environments, mobile platform cooperative detection radar still faces various forms of interference, such as noise interference, deceptive interference, and suppression interference. These interferences not only affect the radar's detection performance and accuracy but may also threaten flight safety. Therefore, evaluating the anti-jamming performance of mobile platform cooperative detection radar systems is particularly important.

[0003] Domestic and international research on quantitative evaluation methods for the anti-suppression jamming performance of mobile platform radar cooperative detection mainly focuses on the following aspects: First, studying the impact mechanism of suppression jamming on radar detection performance; second, studying effective anti-jamming algorithms and signal processing techniques to improve the radar's anti-jamming capability and target detection accuracy; and third, studying the cooperative technology and information fusion methods between radar nodes to achieve more efficient and accurate detection.

[0004] Despite some research findings, there has been a lack of quantitative indicators for evaluating the anti-suppression and jamming performance of airborne distributed radar. Therefore, proposing a comparative and quantitative evaluation method for the cooperative detection and anti-jamming performance of mobile platforms is of great practical significance. Summary of the Invention

[0005] The purpose of this invention is to provide a quantitative evaluation method for the anti-suppression and jamming performance of mobile platform radar cooperative detection, so as to solve the quantitative problem faced by existing airborne distributed radar anti-suppression and jamming performance evaluation technology, and make the evaluation results more specific and accurate.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for quantitatively evaluating the anti-suppression and jamming performance of radar cooperative detection on mobile platforms, characterized by the following steps:

[0008] Step 1: Determine the baseline scenario for anti-jamming performance and calculate the signal-to-interference ratio (SIR) of a single radar receiver under the baseline scenario.

[0009] Step 2: Determine the scenario to be evaluated and calculate the signal-to-interference ratio (SIR) for each radar; this includes the following sub-steps:

[0010] Step 2-1: Determine the detection configuration of the radar system in the scenario to be evaluated. Specifically, determine the number of radars to be used simultaneously and the spatial relationship between each radar according to the mission requirements. Then, establish a spatial coordinate system with the target as the origin to determine the distance and angle between the radar and the jammer when the radar is working.

[0011] Step 2-2: Determine the operating mode of the radar system in this scenario based on the radar signal processing capabilities and the actual task;

[0012] Steps 2-3: Based on the detection configuration, the distance and angle between the radar and the jammer during operation, and the radar operating mode, determine the position of each radar in the antenna pattern of the jammer in the scenario to be evaluated; based on this position, determine the angle between the line connecting each radar and the jammer and the center line of the jammer's main lobe, and then calculate the jammer gain at the location of each radar.

[0013] Steps 2-4: Calculate the signal-to-interference ratio (SIR) of each radar based on the jammer gain at each radar location;

[0014] Step 3: Calculate the improvement in anti-jamming performance of each radar based on the signal-to-interference ratio (SIR) of each radar and the SIR received by a single radar in the reference scenario.

[0015] Step 4: Based on the improvement in anti-jamming performance of each radar, calculate the improvement in anti-jamming performance of the radar system in the scenario to be evaluated.

[0016] Furthermore, in step 1, the formula for calculating the signal-to-interference ratio (SIR) of a single radar receiver under the anti-interference performance benchmark scenario is as follows:

[0017]

[0018] In the formula:

[0019] SJR: Signal-to-interference ratio (SIR) of a single radar receiver in a baseline scenario;

[0020] N: Number of radars;

[0021] P t Transmitter power;

[0022] G t Transmitter transmit power gain;

[0023] σ: Target radar cross-section;

[0024] R: Distance between the radar and the target or jammer;

[0025] P j : Jammer's transmission power;

[0026] G j : The main lobe gain of the jammer;

[0027] γ j : The polarization coefficient of the interference signal on the radar antenna.

[0028] Furthermore, in steps 2-3, the calculation formula for the jammer gain at each radar location is as follows:

[0029]

[0030] In the formula:

[0031] G i ′: Jammer gain at the location of radar i;

[0032] θ i : The angle between the line connecting radar i and the jammer and the center line of the jammer's main lobe;

[0033] n: The number of array elements in the radar array antenna;

[0034] d: Element spacing of the radar array antenna;

[0035] λ: Wavelength of the emitted wave.

[0036] Furthermore, in steps 2-4, the calculation formulas for the signal-to-interference ratio (SIR) of each radar are as follows:

[0037]

[0038] In the formula:

[0039] SJR i The signal-to-interference ratio (SIR) of radar i;

[0040] P t Transmitter power;

[0041] G t Transmitter transmit power gain;

[0042] σ: Target radar cross-section;

[0043] R i : The distance between radar i and the target or jammer;

[0044] P j : Jammer's transmission power;

[0045] γ j : The polarization coefficient of the interference signal on the radar antenna.

[0046] Furthermore, in step 3, the calculation formula for the improvement in the anti-jamming performance of each radar is as follows:

[0047]

[0048] In the formula:

[0049] E i The degree of improvement in the anti-jamming performance of the i-th radar;

[0050] SJR i The signal-to-interference ratio (SIR) of radar i;

[0051] SJR: Signal-to-interference ratio (SIR) of a single radar receiver in a baseline scenario;

[0052] mean: calculates the average value.

[0053] Furthermore, in step 4, the formula for calculating the improvement in the anti-interference performance of the radar system in the scenario to be evaluated is as follows:

[0054]

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0056] This invention, by defining an anti-jamming capability enhancement degree, evaluates the anti-jamming performance of individual radars and systems from the perspective of signal-to-interference ratio (SIR), improving the accuracy and reliability of the evaluation results and laying the foundation for subsequent research. The method of this invention facilitates the evaluation of the anti-jamming performance of individual radars and radar systems in cooperative detection by mobile platforms. Attached Figure Description

[0057] Figure 1 It is a signal-level collaborative detection scenario;

[0058] Figure 2 This shows the change in the improvement of anti-jamming capability of Radar No. 2 over time before the average value was taken.

[0059] Figure 3 This shows the change in the improvement of anti-jamming capability of Radar No. 3 over time before the average value was taken. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0061] The present invention provides a quantitative evaluation method for the anti-suppression and jamming performance of mobile platform radar cooperative detection, which specifically includes the following steps:

[0062] Step 1: Determine the baseline scenario for anti-jamming performance and calculate the signal-to-interference ratio (SIR) of a single radar receiver under the baseline scenario.

[0063] The specific steps are as follows:

[0064] The traditional countermeasures mode is selected as the baseline scenario. Taking the detection of a ground target by a mobile platform radar as an example, N radars are deployed, all sequentially detecting the target along the same trajectory. A jammer is positioned on the ground target. The N radars operate independently. When the target reaches the predetermined position, the radars activate to detect it, at which point the jammer simultaneously jams all N radars using multiple beams.

[0065] Let the jammer's transmission power be P. j In this scenario, each radar will be interfered with. During the entire detection process by N radars, the interference power reaching each radar is approximately P. j / N, according to the ideal radar range equation, the echo signal power received by each radar can be obtained:

[0066]

[0067] In the formula:

[0068] P rs The power of the echo signal received by the radar;

[0069] P t Transmitter power;

[0070] G t Transmitter transmit power gain;

[0071] G r The receiver's main lobe gain, or G, is... t ;

[0072] λ: Wavelength of the emitted wave;

[0073] σ: Target radar cross section (RCS);

[0074] R: Distance between the radar and the target or jammer.

[0075] The expression for the interference power received by the radar:

[0076]

[0077] In the formula:

[0078] P rj : The interference power received by the radar;

[0079] P j : Jammer's transmission power;

[0080] G j : The main lobe gain of the jammer;

[0081] γ j : The polarization coefficient of the interference signal on the radar antenna;

[0082] N: Number of radars.

[0083] The signal-to-interference ratio (SJR) of a single radar receiver in the baseline scenario is:

[0084]

[0085] Step 2: Determine the scenario to be evaluated and calculate the signal-to-interference ratio (SIR) for each radar. This includes the following sub-steps:

[0086] Step 2-1: Determine the detection configuration of the radar system in the scenario to be evaluated. Specifically, determine the number of radars to be used simultaneously and the spatial relationship between each radar according to the mission requirements. Then, establish a two-dimensional or three-dimensional coordinate system with the target as the origin to determine the distance and angle between the radar and the jammer when the radar is working.

[0087] Step 2-2: Determine the working mode of the radar system in this scenario based on the radar signal processing capabilities and the actual task. The working modes can be divided into: working alone, information-level coordination, signal-level coordination, etc.

[0088] Steps 2-3: Based on the detection configuration, the distance and angle between the radar and the jammer during operation, and the radar's operating mode, determine the position of each radar in the jammer's antenna pattern within the scenario to be evaluated. Based on this position, determine the angle between the line connecting each radar to the jammer and the jammer's main lobe centerline, and then calculate the jammer gain at each radar's location. The calculation formula is as follows:

[0089]

[0090] In the formula:

[0091] G i ′: Jammer gain at the location of radar i;

[0092] θ i : The angle between the line connecting radar i and the jammer and the center line of the jammer's main lobe;

[0093] n: The number of array elements in the radar array antenna;

[0094] d: Element spacing of the radar array antenna;

[0095] λ: Wavelength of the emitted wave;

[0096] Steps 2-4: Calculate the signal-to-interference ratio (SIR) of each radar based on the jammer gain at each radar's location. The calculation formula is as follows:

[0097]

[0098] In the formula:

[0099] SJRi The signal-to-interference ratio (SIR) of radar i;

[0100] P t Transmitter power;

[0101] G t Transmitter transmit power gain;

[0102] σ: Target radar cross-section;

[0103] R i : The distance between radar i and the target or jammer;

[0104] P j : Jammer's transmission power;

[0105] G i ′: Jammer gain at the location of radar i;

[0106] γ j : The polarization coefficient of the interference signal on the radar antenna.

[0107] Step 3: Based on the signal-to-interference ratio (SIR) of each radar and the SIR received by a single radar in the baseline scenario, calculate the improvement in anti-jamming performance for each radar, using the following formula:

[0108]

[0109] In the formula:

[0110] E i The degree of improvement in the anti-jamming performance of the i-th radar;

[0111] SJR i The signal-to-interference ratio (SIR) of radar i;

[0112] SJR: Signal-to-interference ratio (SIR) of a single radar receiver in a baseline scenario;

[0113] mean: calculates the average value.

[0114] Step 4: Based on the improvement in anti-jamming performance of each radar, calculate the improvement in anti-jamming performance E of the radar system in the scenario to be evaluated. The calculation formula is as follows:

[0115]

[0116] Example:

[0117] The method described above is used to quantitatively evaluate anti-jamming performance in different application scenarios, providing important reference and guidance for improving the performance of mobile platform collaborative detection radar systems. The feasibility and effectiveness of this invention will be verified through specific embodiments below.

[0118] The quantitative evaluation method for the anti-suppression jamming performance of mobile platform radar cooperative detection provided in this embodiment includes the following steps:

[0119] Step 1: Determine the baseline scenario for anti-interference performance.

[0120] Ground targets are detected using a single radar (N=1) operating alone. A jammer is installed on the ground target, employing a power suppression jamming mode. The signal-to-interference ratio (SIR) experienced by this radar is:

[0121]

[0122] Step 2: Determine the scenario to be evaluated and calculate the signal-to-interference ratio (SIR) of each radar.

[0123] An evaluation was conducted on a signal-level cooperative detection scenario, in which N=3 radars were used for cooperative target detection, employing a one-transmit, three-receive mode (radar 1 transmits, radars 1, 2, and 3 receive). Figure 1 As shown.

[0124] Step 2-1: Determine the detection configuration of the radar system in the scenario to be evaluated.

[0125] exist Figure 1 The radars are spaced 5 kilometers apart and move to the right at a speed of 260 m / s to detect targets at the origin. The jammer is activated when it is 30 kilometers away from the radar.

[0126] Step 2-2: Determine how the radar system operates in the scenario to be evaluated.

[0127] In this detection mission, the radar adopted a one-transmit, three-receive mode, with radar 1 transmitting the signal and radars 1, 2, and 3 receiving the echo signals.

[0128] Steps 2-3: Determine the position of each radar in the antenna pattern of the jammer in the scenario to be evaluated, and calculate the jammer gain at different positions.

[0129] Since radars 2 and 3 are not powered on, it can be assumed that the jammer's main lobe is always aligned with radar 1. As the jammer's position changes with radars 2 and 3, the angle between the line connecting them and the jammer, and the jammer's main lobe, changes simultaneously. This can be calculated using the following formula:

[0130]

[0131] in:

[0132] θ1: Angle between the main lobe of the jammer and the normal;

[0133] θ2: The angle between the line connecting radar 2 and the jammer and the center line of the jammer's main lobe;

[0134] θ3: The angle between the line connecting radar 3 and the jammer and the center line of the jammer's main lobe;

[0135] The positions of radars 2 and 3 in the jammer's radiation pattern also changed.

[0136] Calculate the jammer gain at each radar location:

[0137]

[0138] Steps 2-4: Calculate the signal-to-interference ratio (SIR) based on the radar's position in the jammer's radiation pattern. The calculation formula is:

[0139] Signal-to-interference ratio of Radar No. 1:

[0140]

[0141] Signal-to-interference ratio of Radar No. 2:

[0142]

[0143] Signal-to-interference ratio of Radar No. 3:

[0144]

[0145] Note: σ1=σ. Since the radar cross-section varies in different scenarios, and the radar spacing is relatively small in this scenario, we take σ2≈σ3≈σ.

[0146] Step 3: Calculate the improvement in anti-jamming performance for each radar. The change in anti-jamming performance improvement over time before averaging is shown below. Figure 2 , Figure 3 As shown.

[0147] Calculation formula:

[0148] E1 = 0

[0149]

[0150] Step 4: Calculate the improvement in anti-jamming performance of this radar system in the scenario to be evaluated:

[0151]

[0152] The calculation results above show that:

[0153] (1) From the perspective of a single radar, radar No. 3 has the best anti-jamming performance in this scenario, followed by radar No. 2; (2) From the perspective of the entire radar system, the anti-jamming performance improvement of the system composed of these three radars is 5.26. When the anti-jamming performance improvement of other configurations is greater than 5.26, it indicates that the radar system of other configurations has stronger anti-jamming performance.

[0154] In summary, the method of the present invention can quantify the performance against suppression interference with specific indicators, providing a comparative approach for comparing the performance against interference in other scenarios.

Claims

1. A method for quantitatively evaluating the anti-suppression and jamming performance of mobile platform radar cooperative detection, characterized in that, Specifically, the steps include the following: Step 1: Determine the baseline scenario for anti-jamming performance and calculate the signal-to-interference ratio (SIR) of a single radar receiver under the baseline scenario. Step 2: Determine the scenario to be evaluated and calculate the signal-to-interference ratio (SIR) for each radar; this includes the following sub-steps: Step 2-1: Determine the detection configuration of the radar system in the scenario to be evaluated. Specifically, determine the number of radars to be used simultaneously and the spatial relationship between each radar according to the mission requirements. Then, establish a spatial coordinate system with the target as the origin to determine the distance and angle between the radar and the jammer when the radar is working. Step 2-2: Determine the operating mode of the radar system in this scenario based on the radar signal processing capabilities and the actual task; Steps 2-3: Based on the detection configuration, the distance and angle between the radar and the jammer during operation, and the radar operating mode, determine the position of each radar in the antenna pattern of the jammer in the scenario to be evaluated; based on this position, determine the angle between the line connecting each radar and the jammer and the center line of the jammer's main lobe, and then calculate the jammer gain at the location of each radar. Steps 2-4: Calculate the signal-to-interference ratio (SIR) of each radar based on the jammer gain at each radar location; Step 3: Calculate the improvement in anti-jamming performance of each radar based on the signal-to-interference ratio (SIR) of each radar and the SIR received by a single radar in the reference scenario. The calculation formulas for the improvement in anti-jamming performance of each radar are as follows: In the formula: E i : No. i The anti-jamming performance of the radar has been improved. SJR i : No. i The signal-to-interference ratio of the radar; SJR Signal-to-interference ratio (SIR) of a single radar receiver in a baseline scenario; mean : Calculate the mean; Step 4: Based on the improvement in anti-jamming performance of each radar, calculate the improvement in anti-jamming performance of the radar system in the scenario to be evaluated.

2. The method for quantitatively evaluating the anti-suppression and jamming performance of mobile platform radar cooperative detection as described in claim 1, characterized in that, In step 1, the formula for calculating the signal-to-interference ratio (SIR) of a single radar receiver under the anti-interference performance benchmark scenario is as follows: In the formula: SJR Signal-to-interference ratio (SIR) of a single radar receiver in a baseline scenario; N Number of radars; P t Transmitter power; G t Transmitter transmit power gain; Target radar cross section; R Distance between the radar and the target or jammer; P j : Jammer's transmission power; G j : The main lobe gain of the jammer; : The polarization coefficient of the interference signal on the radar antenna.

3. The method for quantitatively evaluating the anti-suppression and jamming performance of mobile platform radar cooperative detection as described in claim 1 or 2, characterized in that, In steps 2-3, the calculation formula for the jammer gain at each radar location is as follows: In the formula: : No. i The jammer gain at the location of radar number 1; θ i : No. i The angle between the line connecting the radar and the jammer and the center line of the jammer's main lobe; n The number of elements in a radar array antenna; d : The spacing between elements of a radar array antenna; λ Wavelength of the emitted wave.

4. The method for quantitatively evaluating the anti-suppression and jamming performance of mobile platform radar cooperative detection as described in claim 3, characterized in that, In steps 2-4, the calculation formulas for the signal-to-interference ratio (SIR) of each radar are as follows: In the formula: SJR i : No. i The signal-to-interference ratio of the radar; P t Transmitter power; G t Transmitter transmit power gain; Target radar cross section; R i : No. i Distance between radar number 1 and target or jammer; P j : Jammer's transmission power; : The polarization coefficient of the interference signal on the radar antenna.

5. The method for quantitatively evaluating the anti-suppression and jamming performance of mobile platform radar cooperative detection as described in claim 1, characterized in that, In step 4, the formula for calculating the improvement in the anti-jamming performance of the radar system in the scenario to be evaluated is as follows: 。

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