Radar interference simulation and evaluation system

Abstract

The invention discloses a radar interference simulation and evaluation system which comprises a burn-through distance analysis module, a radar receiver pulse receiving module, a radar deception jamming module, a data comparison module and a data export and report generation module. The burn-through distance analysis module is used for calculating the burn-through distance based on the interference equation; the radar receiver pulse receiving module is used for simulating the emission time and the repetition interval of radar emission pulses and determining a time sequence diagram of received pulses; the radar deception jamming module is used for simulating various types of deception jamming strategies; the data comparison module is used for importing experimental result data and performing comparative analysis on the experimental result data and simulation data; and the data export and report generation module is used for exporting a system simulation result. The radar interference simulation and evaluation system provided by the invention simulates the confrontation process and evaluates the confrontation process, and has relatively high accuracy, flexibility and safety.

Description

Technical Field

[0001] This application relates to the field of electronic countermeasure technology, and more specifically, to a radar jamming simulation and evaluation system. Background Art

[0002] In the field of modern electronic countermeasures, as a key detection device, the performance and reliability of a radar are directly related to the combat effectiveness. To effectively counter radar detection, a jammer emits electromagnetic waves to interfere with the radar, making it unable to accurately detect targets. However, traditional radar jamming analysis methods have limitations in many aspects. First, theoretical analysis mainly relies on theoretical derivation and empirical judgment, and it is difficult to intuitively and accurately quantify the detection effect of the radar under different jamming conditions. Especially in the face of a complex actual combat environment, it cannot provide reliable evaluation results. Second, actual radar jamming experiments are limited by factors such as site, equipment, and safety, and it is difficult to conduct comprehensively and deeply. For example, actual experiments need to be carried out in a specific airspace and time, and there are relatively high safety risks, which limit the number and scope of experiments. In addition, data comparison and evaluation also face difficulties. In radar jamming experiments, how to accurately compare experimental data with simulation data and evaluate the reliability of experimental results is a technical problem. Traditional methods mostly rely on manual data processing, which is inefficient and subjective, and it is difficult to objectively and fairly evaluate experimental results. Summary of the Invention

[0003] In view of at least one defect or improvement requirement of the prior art, the present invention provides a radar jamming simulation and evaluation system, which can solve at least one of the problems existing in the above background art.

[0004] To achieve the above object, according to the first aspect of the present invention, there is provided a radar jamming simulation and evaluation system, which includes a burn-through distance analysis module, a radar receiver pulse reception module, a radar deception jamming module, a data comparison module, and a data export and report generation module;

[0005] The burn-through distance analysis module is used to calculate the burn-through distance based on the jamming equation;

[0006] The radar receiver pulse reception module is used to simulate the emission time and repetition interval of the radar transmitted pulse and determine the timing diagram of the received pulse;

[0007] The radar deception jamming module includes a range gate pull-off jamming sub-module, a velocity gate pull-off jamming sub-module, and an angle tracking disruption jamming sub-module, and is used to simulate various types of deception jamming strategies;

[0008] The data comparison module is used to import the experimental result data and conduct a comparative analysis with the simulation data of the burn-through distance analysis module, the radar receiver pulse reception module, and the radar deception jamming module, and display the differences in the conclusion data;

[0009] The data export and report generation module is used to export the system simulation results.

[0010] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, the burn-through distance analysis module calculates the burn-through distance based on the jamming equation, specifically including:

[0011] The burn-through distance analysis module obtains the jammer parameters, radar parameters, and cover target parameters, and calculates the effective jamming area based on the jamming equation. The effective jamming area is the space that satisfies the jamming equation, and the distance between the jammer and the boundary of the effective jamming area is the burn-through distance.

[0012] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, the radar deception jamming module includes a range gate pull-off jamming sub-module, which is used to disrupt the range gate tracking system of the radar. Specifically, it includes generating a strong range pull-off pulse signal that gradually lags behind the target echo after the radar echo pulse, pulling the radar range gate backward, and stopping transmitting the range pull-off pulse after pulling it to a predetermined distance.

[0013] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, the radar deception jamming module also includes a velocity gate pull-off jamming sub-module, which is used to pull the velocity gate of the radar. Specifically, the frequency of the interference signal in the starting section is the same as that of the radar signal, and the frequency of the interference signal gradually increases. After the frequency of the interference signal gradually changes to a predetermined value, it stops at this frequency.

[0014] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, the radar deception jamming module also includes an angle tracking disruption jamming sub-module, which is used to obtain the approximate conical scan frequency, perform on-off modulation on the transmitted interference signal, and transmit a group of interference pulses with a repetition period similar to the radar's covert conical scan.

[0015] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, it further includes a moving target track generation module, which is used to determine whether the sidelobe can detect the echo signal under interference conditions and whether the interference signal can deceive the radar based on the radar equation and the burn-through distance.

[0016] Furthermore, for the above-mentioned radar jamming simulation and evaluation system, it further includes a jamming effect evaluation model, which is used to calculate the self-defense distance after interference and evaluate the jamming effect according to the radar lobe characteristics, the intensity and type of the jammer's interference.

[0017] According to the second aspect of the present invention, a radar jamming simulation and evaluation method is also provided, including:

[0018] Obtain interference scenario data and start the simulation;

[0019] Based on the burn-through distance analysis module, calculate and analyze the burn-through distance. Based on the radar receiver pulse reception module, calculate and analyze the signal propagation delay. Based on the radar deception interference module, simulate the interference effect and calculate the false target track;

[0020] Obtain experimental data and, based on the data comparison module, compare and analyze the experimental data with the simulation data;

[0021] Based on the data export and report generation module, export the system simulation results and obtain an electronic experimental report.

[0022] Furthermore, in the above radar interference simulation and evaluation method, the interference scenario data includes interference data, motion data, and reconnaissance receiver data.

[0023] Furthermore, in the above radar interference simulation and evaluation method, the calculation and analysis of the burn-through distance specifically includes calculating the burn-through distance based on the radar equation, reconnaissance equation, and interference equation.

[0024] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0025] The radar interference simulation and evaluation system provided by the present invention calculates key parameters such as the burn-through distance, signal propagation delay, and signal-to-interference ratio after interference through calculation models and simulation technologies. Users can freely set interference scenarios, parameters, etc. according to needs to carry out various complex interference experiments, improving the accuracy of radar detection and interference analysis. The simulation system is not restricted by actual experimental conditions, enhancing the flexibility and safety of radar interference experiments, reducing the workload of manual data processing, improving the evaluation efficiency, and enhancing the practicality and flexibility of the system. The present invention provides an efficient, accurate, and flexible solution for radar detection and interference analysis, significantly improving the efficiency and reliability of radar interference experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of a radar interference simulation and evaluation system provided by an embodiment of the present application;

[0028] Figure 2 Schematic diagram of positional relationship during self-defense interference provided by an embodiment of the present application;

[0029] Figure 3 Schematic diagram of the minimum interference distance provided by an embodiment of the present application;

[0030] Figure 4 Schematic diagram of the interference effect evaluation model provided by an embodiment of the present application. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The terms "first", "second", "third", etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0033] Figure 1 Schematic diagram of the structure of a radar interference simulation and evaluation system provided by an embodiment of the present application, as Figure 1 shown, a radar interference simulation and evaluation system provided by an embodiment of the present application includes a burn-through distance analysis module, a radar receiver pulse reception module, a radar deception interference module, a data comparison module, and a data export and report generation module;

[0034] The burn-through distance analysis module is used to calculate the burn-through distance based on the interference equation;

[0035] The radar receiver pulse reception module is used to simulate the emission time and repetition interval of the radar emission pulse and determine the timing diagram of the received pulse;

[0036] The radar deception interference module is used to simulate various types of deception interference strategies;

[0037] The data comparison module is used to import the experimental result data and perform a comparative analysis with the simulation data of the burn-through distance analysis module, the radar receiver pulse reception module, and the radar deception interference module, and display the difference in the conclusion data;

[0038] The data export and report generation module is used to export the system simulation results.

[0039] Specifically, the embodiment of the present application provides a radar jamming simulation and evaluation system, including a burn-through distance analysis module, a radar receiver pulse reception module, a radar deception jamming module, a data comparison module, and a data export and report generation module. Through these modules, the system simulates the confrontation process between the radar and the jammer and quantitatively evaluates the jamming effect.

[0040] The burn-through distance analysis module is used to calculate the burn-through distance based on the jamming equation. The burn-through distance refers to the minimum distance at which the radar can "burn through" the jamming to detect the target. This module calculates and analyzes the burn-through distance by inputting the parameters of the radar and the jammer. The user inputs the parameters of the radar and the jammer, including the radar transmit power, antenna gain, operating wavelength, jammer transmit power, antenna gain, operating frequency, etc., and calculates the burn-through distance according to the jamming equation.

[0041] The radar receiver pulse reception module is used to simulate the transmission time and repetition interval of the radar transmitted pulse and determine the timing diagram of the received pulse. This module can distinguish the true target echo signal and the jamming signal. The user inputs the transmission time, repetition interval, and pulse repetition frequency (PRI) of the radar transmitted pulse. According to the input parameters, a transmitted pulse timing diagram is generated. According to the electromagnetic wave propagation delay, a timing diagram of the received pulse is generated. The received pulse includes the true target echo signal and the jamming signal. The system outputs the timing diagram of the received pulse and distinguishes the true target echo signal and the jamming signal. For example, the jamming signal usually has a higher energy than the true target echo signal and is slightly later than the true target echo signal.

[0042] The radar deception jamming module includes a range gate pull-off jamming sub-module, a velocity gate pull-off jamming sub-module, and an angle tracking disruption jamming sub-module, and is used to simulate various types of deception jamming strategies. The range gate pull-off jamming sub-module generates a strong range gate pull-off pulse signal that lags further and further behind the target echo after the radar echo pulse. By gradually increasing the delay of the range gate pull-off pulse, the range gate of the radar is dragged away from the target echo. The system outputs the position of the dragged range gate to evaluate the jamming effect. The velocity gate pull-off jamming sub-module is used to gradually increase or decrease the center frequency of the jamming signal to simulate the Doppler frequency shift. By gradually increasing the frequency of the jamming signal, the velocity gate of the radar is dragged away from the target velocity. The system outputs the position of the dragged velocity gate to evaluate the jamming effect. The angle tracking disruption jamming sub-module is used to disrupt the angle tracking system of the radar using in-phase and synchronous blanking jamming or random blanking jamming. The system outputs the swing condition of the radar antenna to evaluate the jamming effect.

[0043] The data comparison module is used to import the experimental result data and conduct a comparative analysis with the simulation data of the burn-through distance analysis module, the radar receiver pulse reception module, and the radar deception jamming module, and display the differences in the conclusion data. The user imports the actual radar detection data, the jammer emission data, and the reconnaissance receiver reception data. The system compares the calculation results of the burn-through distance, the signal propagation delay, the false radar tracks after generating deception jamming, and the deception jamming evaluation results, outputs the comparison results, displays the data differences, and evaluates the reliability of the experimental results.

[0044] The data export and report generation module is used to export the system simulation results and generate an electronic experimental report. The system exports the calculation results of key parameters such as the burn-through distance, the signal propagation delay, the interference-to-signal ratio, and the false target tracks, and supports formats such as CSV and Excel. The system generates an electronic experimental report, which includes the experimental purpose, the experimental process, the experimental results, and the conclusions, and supports formats such as PDF, Word, and Excel. The report includes data visualization charts such as line charts, bar charts, and scatter plots to intuitively display the experimental results.

[0045] The radar jamming simulation and evaluation system provided by the present invention calculates key parameters such as the burn-through distance, the signal propagation delay, and the interference-to-signal ratio after interference through a calculation model and simulation technology. The user can freely set the interference scenarios, parameters, etc. as needed to carry out various complex interference experiments, improving the accuracy of radar detection and interference analysis. The simulation system is not restricted by actual experimental conditions, enhancing the flexibility and safety of radar jamming experiments, reducing the workload of manual data processing, improving the evaluation efficiency, and enhancing the practicality and flexibility of the system. The present invention provides an efficient, accurate, and flexible solution for radar detection and interference analysis, significantly improving the efficiency and reliability of radar jamming experiments.

[0046] Optionally, for the radar jamming simulation and evaluation system provided in the embodiments of the present application, the burn-through distance analysis module calculates the burn-through distance based on the interference equation, specifically including:

[0047] The burn-through distance analysis module obtains the jammer parameters, the radar parameters, and the cover target parameters, and calculates the effective interference area based on the interference equation. The effective interference area is the space that satisfies the interference equation, and the distance between the jammer and the boundary of the effective interference area is the burn-through distance.

[0048] Specifically, the burn-through distance analysis includes the analysis of the radar equation, the reconnaissance equation, and the interference equation.

[0049] In the process of radar detection and interference countermeasure, the radar side hopes to detect the target of the interference side, while the interference side tries to interfere with the work of the radar side so that it cannot detect its own target. The closer the radar is to the target and the jammer, the worse the interference effect. When the distances from the radar to the jammer and the target are small to a certain extent, the interference will lose its effect, and this distance is the minimum interference distance.

[0050] After the parameters of the jammer, radar, and protected target are given, the effective interference area can be calculated and drawn according to the interference equation. The space that satisfies the interference equation is called the effective interference area. The effective interference area is also called the effective suppression area. The utility ratio of the interference power at the radar receiver is represented by ζ as

[0051]

[0052] where, Δf r and Δf j are the radar receiver bandwidth and the interference signal bandwidth (MHz) respectively, G t is the radar transmitting antenna gain (dB), and G t ’ is the radar transmitting antenna gain in the non-main direction (dB).

[0053] The ratio of the interference power to the echo signal power at the radar receiver is

[0054]

[0055] where, P t is the radar transmitting power (W), P j is the jammer transmitting power (W), G j is the jammer transmitting antenna gain (dB), γ j is the polarization loss of the interference signal to the radar antenna, and R j is the distance from the jammer to the radar (km).

[0056] When the ratio of the interference power to the echo signal power is greater than or equal to the interference-signal power ratio K a at the input of the radar receiver, the interference equation can be obtained, that is, the interference is effective when the above equation is satisfied, and the interference equation is expressed as

[0057]

[0058] According to the different configuration positions of the jammer and the protected target, it can be divided into support interference, accompany interference, and self-defense interference. Here, self-defense interference is mainly taken as an example. The positional relationship among the jammer, the protected target, and the interfered radar during self-defense interference is as Figure 2 shown.

[0059] During self-defense interference, it can be set that R = R j = Rt , solve for R from the interference equation, we have

[0060]

[0061] Given the parameters of the radar, target, and jammer, the right side of the above equation is a constant, denoted as R0, that is

[0062]

[0063] Therefore, we have

[0064] R ≥ R0

[0065] That is, when the jammer is used for point target self-defense, in the space where the distance between the target and the radar is greater than R0, i.e., R > R0, the interference equation is satisfied, and it is all effective interference area or suppression area. When R = R0, it is the boundary of the effective suppression area. In the area where R < R0, the interference power does not satisfy the interference equation, that is, it cannot effectively cover the echo signal, and it is called the exposure area, as Figure 3 shown.

[0066] R0 is the burn-through distance or the radar self-defense distance. When σ is large and the effective power P of the radar t G t is large, the burn-through distance R0 is large, which means the target exposure area is large, and the radar can "burn through" the interference and detect the target at a farther distance; when the effective power P of the interference j G j is large and the σ of the target is small, then R0 is small, indicating that the radar can only detect the target at a closer distance, that is, the effective interference area is large and the exposure area is small.

[0067] Optionally, the moving target track generation experiment includes respectively judging whether the sidelobe can detect the echo signal under interference and whether the interference signal can deceive the radar according to the radar equation and the burn-through distance.

[0068] If the main lobe does not irradiate the target at this time, the gains of the transmitted pulse and the interference signal entering are both the sidelobe gain.

[0069] If the radar sidelobe can detect the target at this time, the transceiver time delay only needs to consider the displacement of the jammer during the one-way time of the electromagnetic wave. After determining the one-way time, the two-way time of the electromagnetic wave propagation is twice the one-way time.

[0070] If the sidelobe cannot detect the target and the interference signal can be detected, the time from the radar transmitting pulse to receiving the interference can be divided into three segments: forward propagation, transponder delay, and reverse propagation. The determination of forward propagation is the same as the condition where the non-interference sidelobe can detect, and the reverse propagation needs to additionally consider the position change of the jammer during the transponder delay process.

[0071] Optionally, for the radar jamming simulation and evaluation system provided by the embodiments of the present application, the radar deception jamming module includes a range gate pull-off jamming sub-module, which is used to disrupt the range gate tracking system of the radar. Specifically, it includes generating a strong range pull-off pulse signal that gradually lags behind the target echo after the radar echo pulse, pulling the radar range gate backward, and stopping transmitting the range pull-off pulse after pulling it to a predetermined distance.

[0072] Specifically, deceptive jamming is mostly used to interfere with the acquisition system and tracking system of fire control radars, and the tracking system of terminal guidance radars. The purpose is to prevent the radar from intercepting the target, from entering the tracking state, or to disrupt the tracking state of the radar and cause it to exit the tracking state; or to make the tracking system track in the wrong direction, so that the target cannot be accurately aimed at and hit.

[0073] Range gate pull-off jamming is an interference method used to disrupt the range gate tracking system of a radar. By generating a strong range pull-off pulse signal that gradually lags behind the target echo after the radar echo pulse, the range gate of the radar is dragged backward until the transmission of the range pull-off pulse stops after reaching a predetermined distance. At this time, the range gate of the radar is dragged away from the target echo and can no longer receive the target signal, thus entering the search state. If the range gate of the radar attempts to track the target echo again, it will be dragged away by the range pull-off pulse again, making it impossible for the radar to effectively track the target. This interference method of transmitting a backward-dragging range pull-off pulse after the target echo is called backward pull-off jamming. On the contrary, if a range pull-off pulse that gradually leads the target echo is transmitted before the target echo, it is called forward pull-off jamming. Range pull-off jamming not only causes the radar to generate incorrect range information, but its main use also lies in cooperating with other interference methods to disrupt the angle tracking system of the radar. Specifically, by dragging the range gate away from the target or continuing to transmit amplitude-modulated pulses, the radar tracking system cannot extract the angle error information from the echo, but mistakes the interference signal with amplitude modulation for the echo signal to extract the angle error information, thus generating false angle information and disrupting the angle tracking of the radar by the target. In the simulation model, a range gate pull-off jamming simulation model is established, including linear pull-off and parabolic pull-off modes, and corresponding control parameters are set, such as interference power, interference antenna gain, system minimum forward delay, etc., to realize the generation and adjustment of the range pull-off pulse. Parameter transfer is carried out between the simulation model and the anti-ship missile terminal guidance radar simulation model to ensure the accuracy and reliability of the simulation results. By real-time acquiring the received pulses of the anti-ship missile terminal guidance radar and adjusting the forward delay time according to different pull-off stages, the corresponding range pull-off pulses are generated to effectively pull the range gate of the radar.

[0074] Optionally, in the radar jamming simulation and evaluation system provided by the embodiments of the present application, the radar deception jamming module further includes a speed gate towing jamming sub-module, which is used to tow the speed gate of the radar. Specifically, it includes the interference signal frequency in the starting section, which is the same as the radar signal. The frequency of the interference signal gradually increases. After the frequency of the interference signal gradually changes to a predetermined value, it stops at this frequency.

[0075] Specifically, similar to range towing jamming, speed towing jamming mainly tugs on the speed gate of the radar. The airborne fire control pulsed Doppler radar sets up a Doppler filter bank and a speed tracking gate. The purpose of setting the Doppler filter is to filter out strong ground clutter and distinguish targets with different radial velocities. The function of the speed tracking gate is to separate targets with a specific radial velocity from other targets. The radar conducts range tracking based on speed tracking. After achieving speed tracking and range tracking, angle tracking is then carried out to control the weapon to attack the target.

[0076] Speed towing jamming is an interference method targeting the radar speed gate, aiming to make the radar's speed tracking system unable to accurately measure the target speed through deception means, thereby disrupting the normal detection function of the radar. First, in the holding stage, the jammer forwards the received radar signal to make the frequency of the interference signal consistent with the radar signal, with the aim of enabling the radar to establish stable speed tracking for the interference signal. Subsequently, it enters the towing stage, where the center frequency of the interference signal gradually becomes higher or lower, simulating the increase in Doppler frequency shift, causing the radar's speed tracking gate to follow the Doppler frequency change of the interference signal to achieve speed gate towing. When the frequency of the interference signal reaches a certain value, that is, when the speed of the simulated false target is stable, the interference signal maintains this frequency or adds Doppler noise, causing the radar's speed gate to stably track the false speed at a position far from the real target speed or jitter within a certain range. After a period of time, the transmission of the speed towing interference signal suddenly stops, resulting in neither interference nor target echo within the radar speed tracking gate. After the radar confirms the loss of the target, it needs to re-search and capture. If the radar captures the target again and switches to tracking, a new round of speed towing process immediately begins, continuously disrupting the radar's stable tracking of the target speed. Once the radar's speed gate tracking is disrupted, its range tracking and angle tracking states will also be affected. The radar cannot enter a stable angle tracking state, and thus cannot effectively control the weapon system for firing and guidance.

[0077] Optionally, in the radar jamming simulation and evaluation system provided by the embodiments of the present application, the radar deception jamming module further includes an angle tracking disruption jamming sub-module, which is used to obtain a rough conical scan frequency, perform on-off modulation on the transmitted interference signal, and transmit an interference pulse group with a repetition period similar to the radar's covert conical scan.

[0078] Specifically, the stealth line-scan tracking system is an anti-jamming measure. Its feature is that the radar transmitting part does not perform line scanning, and only the receiving antenna performs line scanning. As a result, the reconnaissance receiver of the jammer cannot receive the scanning amplitude envelope of the radar, and thus cannot implement inverse-phase jamming or synchronous blanking jamming. To counter the radar with this stealth line-scan tracking system, a jamming method based on the rough conical scan frequency obtained from other intelligence channels is adopted. By transmitting a group of jamming pulses with a repetition period similar to the stealth conical scan of the radar, the transmitted jamming signal is switched modulated. When the radar receives this jamming signal, its tracking antenna will be in a constantly swinging state and cannot stably track the target. In addition, for the stealth line-scan tracking radar, since the jammer cannot obtain the scanning envelope, the present invention adopts a random blanking jamming method. The result of this jamming method is that the electronic countermeasure equipment of the radar antenna cannot work properly, thus effectively destroying the tracking ability of the radar.

[0079] After the jamming techniques of inverse-phase and synchronous blanking jamming are used, the exposed conical scan radar and the line-scan tracking radar cannot work properly. Therefore, the radar adopts corresponding anti-jamming measures, which is the stealth line-scan tracking system. Stealth conical scan tracking means that the radar transmitting part does not use conical scan, and only the receiving antenna performs conical scan. Stealth line-scan tracking is similar. The radar transmitter does not use line scan, and only the receiving antenna performs line scan. At this time, the reconnaissance receiver of the jammer cannot receive the scanning amplitude envelope of the radar, so it cannot implement inverse-phase jamming or synchronous blanking jamming. The jamming method for the tracking radar with the stealth conical scan system is to use the rough conical scan frequency obtained from other intelligence channels to switch modulate the transmitted jamming signal. That is, to transmit a group of jamming pulses with a repetition period similar to the stealth conical scan of the radar. After the radar receives this jamming signal, the tracking antenna will be in a constantly swinging state and cannot stably track the target. For the stealth line-scan tracking radar, due to the fact that the jammer cannot obtain the scanning envelope, a random blanking jamming method is adopted. The result of the jamming is that the radar antenna cannot work properly.

[0080] The tracking axis (sector scan center) swings constantly and cannot stably track the target, so the gun controlled by the radar cannot aim and shoot, and the missile guided by the radar cannot accurately fly towards the target.

[0081] Optionally, the radar jamming simulation and evaluation system provided by the embodiments of the present application further includes a moving target track generation module, which is used to judge whether the sidelobe can detect the echo signal under the interference condition and whether the jamming signal can implement deception jamming on the radar according to the radar equation and the burn-through distance.

[0082] Specifically, according to the radar lobe characteristics, the intensity and type of the jammer's interference, the self-defense distance after interference is obtained. As Figure 4 shown, the power of the target echo signal received by the radar is

[0083]

[0084] Among them, G gs0 is the anti-interference improvement factor, P t is the transmitting power of the radar, G t is the radar antenna gain, σ is the radar cross section of the target, A is the effective area of the radar antenna, A = λ 2 G t / 4π, λ (or f) is the operating wavelength of the radar, R t is the distance between the target and the radar.

[0085] The interference power actually entering the radar receiver is

[0086]

[0087] Among them, P J (f) is the transmitting power of the jammer at a certain frequency, G J (φ) is the gain of the jammer antenna in the direction of the radar, G t (θ) is the gain of the radar antenna in the direction of the jammer, γ J is the polarization mismatch loss coefficient between the interference signal and the radar signal (usually the interference signal is circularly polarized, when the radar antenna is linearly polarized, γ J = 0.5), R J is the distance between the jammer and the radar, B n is the bandwidth of the radar receiver, B J is the interference bandwidth, G J (φ) can be directly determined by the jammer antenna pattern.

[0088] When the pattern is unknown, the following formula can also be used for approximate calculation

[0089]

[0090] Among them, G J is the gain in the main lobe direction of the jammer antenna, Φ is the error angle of the radar positioning by the reconnaissance aircraft, φ 0.5 is the beam width of the jammer, K J is a constant, taking 0.04 - 0.10 (for high-gain sharp-direction antennas, K J takes 0.07 - 0.10; for antennas with wider beams and lower gains, K J takes 0.04 - 0.07).

[0091] Similarly, G r (θ) can be directly determined by the radar antenna pattern and is related to the radar anti-interference measures. When the pattern is unknown, it can be calculated by the following formula, that is

[0092]

[0093] Among them, θ is the angle between the line connecting the radar and the target and the line connecting the radar and the jammer, θ 0.5 is the radar antenna lobe width, and K is a constant, taking values from 0.04 to 0.10.

[0094] G1 to G3 are anti-jamming improvement factors, defined as follows.

[0095] Sidelobe cancellation

[0096] The parameters are related to the radar and can be changed.

[0097] Sidelobe blanking

[0098] When happens, first take G1 = G2 = G3 = 1 and calculate P rj 、P rs .

[0099] If P rj > P rs , then G1 = G2 = G3 = 0.

[0100] Wide-limiting and narrow G1 = G2 = G3 = 0.9, and the parameters are related to the radar.

[0101] Anti-meteorological G1 = G2 = G3 = 0.01, and the parameters are related to the radar and can be changed.

[0102] Shutter-limiting G1 = G2 = G3 = 0.02, and the parameters are related to the radar and can be changed.

[0103] In the case of multiple jammers, the total interference power entering the radar receiver input end is the sum of the interference powers of each jammer entering the radar receiver, that is

[0104] P rj = P n + ∑P rji

[0105] P n = KT0B n F n is the equivalent input noise of the receiver.

[0106]

[0107] The part after the plus sign represents the first jammer, the second jammer, the third jammer, etc.

[0108] According to the definition of self-defense distance, when the signal-to-interference ratio is equal to the minimum signal-to-interference ratio required for the radar to detect the signal, the distance between the radar and the target is called the self-defense distance

[0109]

[0110] Can be expressed as

[0111]

[0112] Wherein, R z is the radar self-defense distance, and (S / J) min is the minimum signal-to-interference-plus-noise ratio (12.8 dB) required for the radar to detect a signal.

[0113] Optionally, the radar jamming simulation and evaluation system provided by the embodiments of the present application further includes a jamming effect evaluation model, which is used to calculate the self-defense distance after jamming according to the radar lobe characteristics, the intensity and type of the jammer's jamming, and evaluate the jamming effect.

[0114] The present application also provides a radar jamming simulation and evaluation method, including:

[0115] Obtain jamming scenario data and start the simulation;

[0116] Calculate and analyze the burn-through distance based on the burn-through distance analysis module, calculate and analyze the signal propagation delay based on the radar receiver pulse reception module, simulate the jamming effect based on the radar deception jamming module, and calculate the false target track;

[0117] Obtain experimental data, and compare and analyze the experimental data with the simulation data based on the data comparison module;

[0118] Export the system simulation results based on the data export and report generation module, and obtain an electronic experimental report.

[0119] Specifically, the system needs to obtain jamming scenario data, which includes jamming data, motion data, and reconnaissance receiver data. The jamming data covers parameters such as the transmit power, antenna gain, and operating frequency of the jammer; the motion data includes the speed, direction, and position information of the target and the jammer; the reconnaissance receiver data includes parameters such as the receiving bandwidth, antenna gain, and operating wavelength of the radar. These data are collected and stored through the data input module of the system, providing a basis for subsequent simulation analysis.

[0120] The system performs burn-through distance calculation and analysis, including radar equation calculation data, reconnaissance equation calculation data, and jamming equation calculation data. The radar equation is used to calculate the detection distance of the radar without jamming; the reconnaissance equation is used to calculate the detection ability of the reconnaissance equipment in a jamming environment; the jamming equation is used to calculate the jamming effect of the jammer on the radar. Through the calculation of these equations, the system can analyze various factors affecting the burn-through distance, such as jamming power, radar power, antenna gain, etc.

[0121] The system obtains the signal propagation delay through signal propagation delay analysis. By calculating the total delay of the signal from transmission to reception, the system can determine the signal time received by the radar receiver, thus providing a time reference for subsequent signal processing and interference analysis. The calculation result of the signal propagation delay will be used to generate the timing diagram of the received pulse to distinguish the true target echo signal and the interference signal.

[0122] The system obtains the interference-to-signal ratio (the ratio of interference power to signal power) through interference effect simulation, including various interference strategies such as range gate pull-off interference, velocity gate pull-off interference, and angle tracking spoofing interference. By simulating these interference strategies, the system can calculate the interference-to-signal ratio under different interference conditions and evaluate the effectiveness of the interference effect.

[0123] The system obtains the false target track through false target track calculation. This calculation is based on the radar equation and the burn-through distance to determine whether the sidelobe can detect the echo signal under interference conditions and whether the interference signal can deceive the radar. By generating the false target track, the system can simulate the false detection results of the radar in the interference environment and evaluate the spoofing nature of the interference effect. The calculation result of the false target track will be used to generate the false track diagram of the radar, providing an intuitive display for the evaluation of the interference effect.

[0124] The system obtains experimental data, which includes actual radar detection data, jammer emission data, and reconnaissance receiver reception data. The experimental data is collected in real-time through the data acquisition module of the system to ensure the accuracy and reliability of the data. The experimental data will be used for comparative analysis with the simulation data to verify the accuracy of the simulation model. The comparative analysis of the experimental data and the simulation data includes the calculation results of the burn-through distance, signal propagation delay, radar false track after generating spoofing interference, and spoofing interference evaluation results, etc. By calculating the difference and evaluation score, the system can objectively evaluate the reliability of the experimental results and provide a scientific basis for the optimization of radar interference strategies.

[0125] The system exports the system simulation results, including the calculation results of key parameters such as burn-through distance, signal propagation delay, interference-to-signal ratio, false target track, etc. The exported data supports multiple formats such as CSV, Excel, etc., facilitating subsequent analysis and report writing by users. The system generates an electronic experimental report. The experimental report contains contents such as experimental purpose, experimental process, experimental results, and conclusions, and supports formats such as PDF, Word, and Excel. The report also includes data visualization charts such as line charts, bar charts, and scatter plots to intuitively display the experimental results. The electronic experimental report provides users with a comprehensive and detailed experimental summary, facilitating reporting and archiving by users.

[0126] The radar jamming simulation and evaluation system of the present invention provides an efficient, accurate and flexible solution for radar detection and jamming analysis, significantly improving the efficiency and reliability of radar jamming experiments.

[0127] Optionally, in the radar jamming simulation and evaluation method provided by the embodiments of the present application, the interference scenario data includes interference data, motion data and reconnaissance receiver data.

[0128] Optionally, in the radar jamming simulation and evaluation method provided by the embodiments of the present application, calculating and analyzing the burn-through distance specifically includes calculating the burn-through distance based on the radar equation, the reconnaissance equation and the interference equation.

[0129] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0130] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0131] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some service interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0132] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] In addition, in each embodiment of the present application, each functional unit may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0134] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and practicing the present disclosure herein, those skilled in the art will readily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0135] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0136] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A radar interference simulation and evaluation system, characterized in that: It includes burn-through distance analysis module, radar receiver pulse receiving module, radar deception jamming module, data comparison module and data export and report generation module; The burn-through distance analysis module is used to calculate the burn-through distance based on the interference equation; The radar receiver pulse receiving module is used to simulate the transmission time and repetition interval of the radar transmission pulse and determine the timing diagram of the received pulse; The radar deception jamming module is used to simulate various types of deception jamming strategies; The data comparison module is used to import the experimental result data, compare and analyze the simulation data of the burn-through distance analysis module, the radar receiver pulse receiving module and the radar deception interference module, and display the conclusion data difference; The data export and report generation module is used to export system simulation results.

2. The radar interference simulation and evaluation system as claimed in claim 1, characterized in that: The burn-through distance analysis module calculates the burn-through distance based on the interference equation, specifically including: The burn-through distance analysis module obtains jammer parameters, radar parameters and cover target parameters, and calculates the effective interference area based on the interference equation. The effective interference area is the space that satisfies the interference equation, and the distance between the jammer and the boundary of the effective interference area is the burn-through distance.

3. The radar interference simulation and evaluation system as claimed in claim 1, characterized in that: The radar deception jammer module includes a range-drag jammer submodule, which is used to destroy the range gate tracking system of the radar. Specifically, it generates a strong drag pulse signal that gradually lags behind the target echo after the radar echo pulse, drags the radar range gate backward, and stops emitting the drag pulse after it reaches a predetermined distance.

4. The radar interference simulation and evaluation system as claimed in claim 3, characterized in that: The radar deception interference module also includes a speed gate dragging interference submodule, which is used to drag the speed wave gate of the radar, specifically including the interference signal frequency of the starting section, which is the same as the radar signal. The frequency of the interference signal gradually increases, and after the frequency of the interference signal gradually changes to a predetermined value, it stops at this frequency.

5. The radar interference simulation and evaluation system as claimed in claim 4, characterized in that: The radar deception jamming module also includes an angle tracking jamming submodule, which is used to obtain a rough cone scanning frequency, perform switch modulation on the transmitted jamming signal, and transmit a jamming pulse group with a repetition period close to the radar hidden cone scanning.

6. The radar interference simulation and evaluation system as claimed in claim 1, characterized in that: It also includes a moving target track generation module, which is used to determine whether the side lobe can detect the echo signal under interference conditions and whether the interference signal can deceive and interfere with the radar based on the radar equation and the burn-through distance.

7. The radar interference simulation and evaluation system as claimed in claim 1, characterized in that: It also includes a jamming effect evaluation model, which is used to calculate the self-defense distance after jamming and evaluate the jamming effect based on the radar lobe characteristics, the intensity and type of jammer interference.

8. A radar interference simulation and evaluation method, characterized in that: include: Obtain interference scenario data and start simulation; The burn-through distance is calculated and analyzed based on the burn-through distance analysis module, the signal propagation delay is calculated and analyzed based on the radar receiver pulse receiving module, the interference effect is simulated based on the radar deception interference module, and the false target track is calculated; Acquire experimental data, and compare and analyze the experimental data with simulation data based on the data comparison module; The system simulation results are exported based on the data export and report generation module to obtain an electronic experiment report.

9. The radar interference simulation and evaluation method according to claim 8, characterized in that: The interference scenario data includes interference data, motion data and reconnaissance receiver data.

10. The radar interference simulation and evaluation method according to claim 8, characterized in that: The calculation and analysis of the burn-through distance specifically includes calculating the burn-through distance based on a radar equation, a reconnaissance equation and an interference equation.

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