8-18GHz radar interference system and method thereof

Abstract

The invention provides an 8-18GHz radar interference system and a method thereof, which solve the problem that the effectiveness of resisting novel cognitive radar interference is reduced, and the like, and comprises a control subsystem, the control subsystem is connected with a plurality of modulation subsystems through a communication network, each modulation subsystem is provided with a control terminal, the control terminal is connected with a signal processing host, and the signal processing host is connected with a wireless communication network. The signal processing host is connected with a receiving antenna body and is connected with a transmitting antenna body through a power amplifier host. The method has the advantages of good cooperative control effect, good interference effectiveness and the like.

Description

Technical Field

[0001] This invention belongs to the field of radar jamming technology, specifically relating to an 8-18 GHz radar jamming system and method. Background Art

[0002] Radar can accurately determine key information such as the target's spatial position and velocity, and quickly transmit this information to the rear control system. Radar jamming systems play a crucial role in countering radar. While current radar jamming technology has achieved wide-band coverage and multi-mechanism jamming capabilities, significant technical bottlenecks remain: insufficient collaborative control capabilities among multiple jamming sources; and when countering new cognitive radars, traditional DRFM technology struggles to analyze adaptive waveforms in real time, leading to reduced jamming effectiveness.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a method for estimating tracking radiation source parameters based on a passive radar seeker and its application [202110049266.5]. When there is one radar and several interference sources in the tracking direction, the radar signal is filtered out and the pulse parameters are estimated through the following steps: Step 1: Save the PDW of the pulses in the tracking direction; Step 2: Calculate the leading edge frequency and leading edge slope of each pulse in the tracking direction and save it to the PDW; Step 3: Cluster the pulses in the tracking direction according to the leading edge frequency and leading edge slope; Step 4: Perform PRI sorting on the pulses in the grid where the number of pulses exceeds the threshold; Step 5: Determine the fixed frequency pulse; Step 6: Perform slope clustering on the pulses in the tracking direction; Step 7: Perform PRI sorting on the pulses in the box where the number of pulses exceeds the threshold; Step 8: Determine the frequency-agile pulse.

[0004] The above-mentioned scheme has solved the problem of coordinated control of multiple interference sources to a certain extent, but it still has many shortcomings, such as the reduced effectiveness in countering new cognitive radar interference. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed 8-18GHz radar jamming system with good collaborative control performance.

[0006] Another objective of this invention is to provide an 8-18 GHz radar jamming method with good jamming effectiveness in response to the above-mentioned problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an 8-18GHz radar jamming system, comprising a control subsystem, which is connected to several modulation subsystems via a communication network. Each modulation subsystem has a control terminal, which is connected to a signal processing host. The signal processing host is connected to a receiving antenna and, through a power amplifier host, to a transmitting antenna. The signal processing host includes a signal processing board, which carries a multi-channel receiving module connected to the receiving antenna, a multi-channel transmitting module connected to the power amplifier host, and a signal storage card connected to the signal processing board. The multi-channel transmitting module, the signal processing board, and the signal storage card are equipped with a power supply module. The power supply module, the power amplifier host, and the control terminal are connected to a generator.

[0008] An 8-18 GHz radar jamming method, employing the aforementioned 8-18 GHz radar jamming system, includes the following steps:

[0009] S1: Signal detection and processing, including signal acquisition, parameter measurement, signal sorting and identification;

[0010] S2: Interference implementation, including suppressing interference generation and deceiving interference generation;

[0011] S3: Collaborative work, including single-node mode and multi-node mode.

[0012] In the aforementioned 8-18GHz radar jamming method, during reconnaissance in step S1, the modulation subsystem, upon receiving control commands from the control terminal, performs reconnaissance work according to the control requirements. The modulation subsystem controls the direction of the receiving antenna via a servo turntable, performing reconnaissance reception and measurement analysis on the incoming wave. The receiving antenna receives the radar signal, inputs it to the signal processing host, and performs low-noise amplification, filtering, and down-conversion processing through a multi-channel receiving module to form 8 intermediate frequency (IF) signals. The signal processing board receives the 8 IF signals, performs acquisition, channelization, and DDC processing to form the baseband signal to be analyzed, and outputs it to the signal storage card for storage. The signal processing board performs parameter measurement, angle measurement, and analysis processing on the baseband signal to form a PWD word. The signal processing board then performs signal analysis processing to form an EDW word, and transmits the result to the control terminal to form the reconnaissance result.

[0013] In the aforementioned 8-18 GHz radar jamming method, in step S1, the radar signal detected by the receiving antenna is used to calculate the direction of arrival of the 8-channel signal by employing interferometer direction finding or spatial spectrum processing algorithms.

[0014] In the aforementioned 8-18GHz radar jamming method, in step S1, when each node of the modulation subsystem acquires the arrival time of the radar pulse signal, the control subsystem acquires the radar target position through time difference positioning; when each node of the modulation subsystem acquires the azimuth of the radar signal, the control subsystem acquires the radar target position through a cross-positioning algorithm.

[0015] In the aforementioned 8-18 GHz radar jamming method, step S1, radar signal sorting and identification, includes the following steps:

[0016] S11: Radar reconnaissance signal preprocessing, rapid matching of known radars, and pre-sorting of remaining pulses;

[0017] S12: Known radar signal main processing, inputting the preprocessed known radar PDW sub-stream, performing PRI fine sorting and existence detection, and performing parameter estimation and state analysis;

[0018] S13: Main processing of unknown radar signals. Input the preprocessed unknown radar PDW sub-stream, perform PRI analysis and sequence detection, then perform radiation source existence determination, parameter estimation and confidence measurement, and finally complete function identification and database update.

[0019] In the aforementioned 8-18GHz radar jamming method, in step S2, the receiving antenna receives the target's transmitted signal. When the signal is intercepted, parameter measurements and signal analysis are performed. After the target signal is detected, an interference signal is generated in the signal processing board according to the suppression jamming algorithm and the deception jamming algorithm. An intermediate frequency signal is output, and an radio frequency signal is generated through up-conversion processing. The signal is then amplified by the power amplifier host and radiated out by the transmitting antenna to interfere with the target.

[0020] In the aforementioned 8-18 GHz radar jamming method, when suppressing jamming in step S2, the jamming signal patterns include broadband noise, aiming noise, sweeping noise, comb spectrum noise, and agile noise.

[0021] In the aforementioned 8-18 GHz radar jamming method, when performing conventional radar deception jamming in step S2, the modulation subsystem receives radar signals, performs signal detection and parameter measurement on the radar signals to obtain target radar information, including radar sample signals, pulse width, and repetition frequency period. Under the control of the jamming strategy, it generates high-fidelity false targets, dense false targets, velocity dragging, range dragging, and combined range-velocity dragging jamming signals to perform deception jamming on conventional radar.

[0022] In the aforementioned 8-18 GHz radar jamming method, when performing SAR radar deception jamming in step S2, the target model of the jamming point is calculated based on the false target, the jammer, and the SAR radar flight path. The time delay model and phase modulation module of a single deception jamming point are also calculated. Based on the SAR radar repetition rate period, operating frequency, and flight speed, a two-dimensional jamming template is generated using a two-dimensional image. Each point in the two-dimensional image is modulated using the jamming point model to expand it into a two-dimensional surface jamming model. Time delay control and phase modulation are applied to each point in the jamming model to form a two-dimensional jamming template. The system detects SAR signals and intercepts SAR sample signals through signal detection and measurement. The SAR sample signals are convolved with the two-dimensional jamming template to form a jamming baseband signal. An intermediate frequency signal is generated from the jamming baseband signal and then up-converted to emit a jamming radio frequency signal.

[0023] Compared with existing technologies, the advantages of this invention are as follows: it adopts a distributed architecture of control subsystem and multi-modulation subsystem, connected through a communication network, supporting single-node mode and multi-node collaborative mode, and has a better collaborative control effect; it processes signals in parallel through multiple channels, and performs signal sorting and identification as well as high-precision lateral detection, thus having better signal processing and detection capabilities; for advanced radar, especially SAR radar, it adopts two-dimensional surface deception jamming, which effectively improves radar jamming capability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the working principle of the 8-18GHz radar jamming system of the present invention;

[0025] Figure 2 This is a schematic diagram of the system control and status monitoring functions of the present invention;

[0026] Figure 3 This is another schematic diagram of the system control and status monitoring functions of the present invention;

[0027] Figure 4 This is a functional block diagram of the PDW measurement module of the present invention;

[0028] Figure 5 This is a schematic diagram of the interferometer testing function of the present invention;

[0029] Figure 6 This is a schematic diagram of the L-shaped two-dimensional direction finding array of the present invention;

[0030] Figure 7 This is a schematic diagram of the radar signal cooperative positioning function of the present invention;

[0031] Figure 8 This is a schematic diagram of the baseband noise interference signal generation of the present invention.

[0032] Figure 9 This is a block diagram illustrating the principle of adjustable delay interference for multiple false targets in this invention.

[0033] Figure 10 This is a schematic diagram of the SAR deception jamming method of the present invention;

[0034] Figure 11 This is a basic flowchart of radar signal sorting and identification of the present invention;

[0035] Figure 12 This is a flowchart of the autocorrelation algorithm of the present invention;

[0036] Figure 13 This is a statistical flowchart of the PRI distribution histogram according to the present invention;

[0037] In the diagram, the components are: control subsystem 1, communication network 2, modulation subsystem 3, control terminal 31, receiving antenna 32, power amplifier host 33, transmitting antenna 34, signal processing host 4, signal processing board 41, multi-channel receiving module 42, multi-channel transmitting module 43, signal storage card 44, power supply module 45, and generator 46. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, an 8-18GHz radar jamming system includes a control subsystem 1. The control subsystem 1 is connected to several modulation subsystems 3 via a communication network 2. The modulation subsystems 3 have a control terminal 31. The control terminal 31 is connected to a signal processing host 4. The signal processing host 4 is connected to a receiving antenna 32 and is connected to a transmitting antenna 34 via a power amplifier host 33.

[0040] The signal processing host 4 includes a signal processing board 41, which is connected to the receiving antenna 32 via a multi-channel receiving module 42 and to the power amplifier host 33 via a multi-channel transmitting module 43. The signal processing board 41 is also connected to a signal storage card 44. The multi-channel transmitting module 43, the signal processing board 41, and the signal storage card 44 are equipped with a power module 45. The power module 45, the power amplifier host 33, and the control terminal 31 are connected to the generator 46.

[0041] When operating under the unified control of control subsystem 1, control subsystem 1 and modulation subsystem 3 are connected via a communication network 2 such as optical fiber or local area network. Control subsystem 1 sends operating parameters and control commands to modulation subsystem 3. The working principle of a single modulation subsystem 3 node is the same as the control working principle of control terminal 31.

[0042] When the control subsystem 1 controls multiple modulation subsystem 3 nodes, it can use the target information acquired by multiple nodes to perform fusion processing, such as collaborative cross-positioning and fusion processing of the target.

[0043] A radar jamming method for 8-18 GHz includes the following steps:

[0044] S1: Signal detection and processing, including signal acquisition, parameter measurement, signal sorting and identification;

[0045] S2: Interference implementation, including suppressing interference generation and deceiving interference generation;

[0046] S3: Collaborative work, including single-node mode and multi-node mode.

[0047] like Figure 2-4 As shown, in step S1, during reconnaissance, after receiving the control command from the control terminal 31, the modulation subsystem 3 performs reconnaissance work according to the control requirements. The modulation subsystem 3 controls the direction of the receiving antenna 32 by controlling the servo turntable of the receiving antenna 32, and performs reconnaissance reception and measurement analysis on the incoming wave. The receiving antenna 32 receives the radar signal and inputs it into the signal processing host 4. The multi-channel receiving module 42 performs low-noise amplification, filtering, and down-conversion processing to form 8 intermediate frequency signals. The signal processing board 41 receives the 8 intermediate frequency signals, performs acquisition, channelization, and DDC processing to form the baseband signal to be analyzed, and outputs it to the signal storage card 44 for storage. The signal processing board 41 performs parameter measurement, angle measurement, and analysis processing on the baseband signal to form PWD words. The signal processing board 41 performs signal analysis processing to form EDW words, and transmits the results to the control terminal 31 to form the reconnaissance results.

[0048] like Figure 5 As shown, in step S1, the radar signal detected by the receiving antenna 32 is used to calculate the direction of arrival of the 8-channel signal using interferometric direction finding or spatial spectrum processing algorithms. The interferometric direction finding consists of multiple antenna elements located at different positions. The distance between the antenna elements causes a phase difference φ in the signals they receive due to the path difference Δd. By comparing the phase difference φ of the signals received from the same radiation source by different antenna elements, the angle of arrival θ of the radiation source can be determined.

[0049] like Figure 6 As shown, based on the usage requirements, an L-shaped two-dimensional array is designed to achieve two-dimensional direction finding, enabling simultaneous direction finding of both azimuth and elevation.

[0050] like Figure 7As shown, in step S1, when each node of the modulation subsystem 3 obtains the arrival time of the radar pulse signal, the control subsystem 1 obtains the radar target position through time difference positioning; when each node of the modulation subsystem 3 obtains the azimuth of the radar signal, the control subsystem 1 obtains the radar target position through cross-positioning algorithm.

[0051] The 8-18 GHz radar jamming system has four independent modulation subsystems 3. Each modulation subsystem 3 has reconnaissance and direction finding capabilities and outputs the detected incoming wave direction to the control subsystem 1. The control subsystem 1 calculates the target position by fusing the incoming wave directions of the four nodes.

[0052] Specifically, in step S1, each node of the 8-18GHz radar jamming system has independent jamming capabilities against conventional radar and SAR radar, and can generate different suppression jamming by receiving radar signals through reconnaissance.

[0053] The main parameters for radar signal sorting and identification include: pulse repetition period or frequency, pulse width, carrier frequency, signal direction of arrival, and signal amplitude. Other signal parameters, such as pulse width variations, pulse amplitude variation patterns, pulse repetition frequency variations and patterns, and carrier frequency variations and patterns, are very important for signal identification, but are usually not used as sorting parameters.

[0054] like Figure 11-13 As shown, the radar signal sorting and identification includes the following steps:

[0055] S11: Radar reconnaissance signal preprocessing, performing rapid matching of known radars, and pre-sorting of remaining pulses; the main task of signal preprocessing is to complete the pre-sorting of real-time input full pulses based on the main characteristics of known radar radiation sources and prior knowledge of unknown radar radiation sources.

[0056] The real-time input full pulse is quickly matched with known radar signal characteristics to separate known radar signal sub-streams that match the known radar signal characteristics. These sub-streams are placed in the data buffer of known radars, where the main processing unit performs further sorting, identification, and parameter estimation according to the processing method for known radar signals. Then, based on prior knowledge of known general radar signal characteristics, the remaining full pulses are pre-sorted to generate unknown radar signal sub-streams, which are placed in the data buffer of unknown radars. Here, the main processing unit performs radiation source detection, identification, and parameter estimation according to the processing method for unknown radar signals.

[0057] S12: Known radar signal main processing, inputting the preprocessed known radar PDW sub-stream, performing PRI fine sorting and existence detection, and performing parameter estimation and state analysis;

[0058] Using known radar pulse PRI information, the PDW substream of the radar is further sorted. Based on the number of pulses or other characteristics within a given time T, the existence of a known radar is determined. Starting from any PDW, if N consecutive periods follow that match the PRI characteristics of a certain radar signal, then this PDW is considered a sorted pulse for that radar. If the number of sorted pulses within time T exceeds the detection threshold V, the radar is determined to exist; otherwise, it is not. Under this criterion, the PRI sorting filtering mainly employs an improved autocorrelation algorithm. If the known radar exists, then the current signal parameters and their transition characteristics, antenna scanning period and scanning mode, and start and end times of operation are further estimated. Based on the current signal parameter characteristics of the radar and the information of known radar operating characteristics, the radar type, function, current operating status, and threat level are identified and determined.

[0059] S13: Main processing of unknown radar signals. Input the preprocessed unknown radar PDW sub-stream, perform PRI analysis and sequence detection, then perform radiation source existence determination, parameter estimation and confidence measurement, and finally complete function identification and database update.

[0060] Using PRI analysis technology, we detect the existence of data sequences from unknown radars and separate their PDWs (Programmable Wires). We then perform statistical analysis on typical PRI distribution histograms. We determine the presence of radiation sources in the separated PDW substreams. Finally, we identify and assess the radar's function, operating mode, and threat level, and supplement the processing of known radars with the results.

[0061] In addition, in step S2, the receiving antenna 32 receives the target's transmitted signal, performs parameter measurement and signal analysis when intercepting the signal, and generates an interference signal in the signal processing board 41 according to the suppression interference algorithm and the deception interference algorithm after the target signal is detected. The intermediate frequency signal is output, and the radio frequency signal is generated through up-conversion processing. The signal is amplified by the power amplifier host 33 and radiated by the transmitting antenna 34 to interfere with the target.

[0062] like Figure 8 As shown, each node of the 8–18 GHz radar jamming system possesses independent jamming capabilities against conventional radar and SAR radar. It can generate different types of suppression jamming by receiving radar signals through reconnaissance. During suppression jamming, the jamming signal patterns include broadband noise, targeting noise, sweeping noise, comb-spectrum noise, and agile noise.

[0063] As can be seen, when performing conventional radar deception jamming in step S2, the modulation subsystem 3 receives the radar signal, performs signal detection and parameter measurement on the radar signal to obtain target radar information, including radar sample signal, pulse width, and repetition frequency period. Under the control of the jamming strategy, it generates high-fidelity false targets, dense false targets, velocity dragging, range dragging, and combined range and velocity dragging jamming signals to perform deception jamming on the conventional radar.

[0064] like Figure 9 As shown, the range delay of the false target signal is achieved through a digitally adjustable delay line. This adjustable delay line actually consists of a first-stage high-capacity buffer and a second-stage fine buffer. The first-stage buffer is used to implement high-speed buffering of the radar baseband signal, enabling time-division multiple target acquisition / formation targeting. The second stage is a multi-target high-speed buffer, therefore possessing multiple physical delay lines. This is used to achieve internal extended scattering points of high-resolution targets or to achieve multiple targets with relatively close distances within a formation. After passing through each physical delay line, the signal undergoes Doppler modulation and amplitude modulation. Finally, the signals are synthesized to form the target baseband echo signal.

[0065] like Figure 10 As shown, in step S2, when performing SAR radar deception jamming, the target model of the jamming point is calculated based on the false target, the jammer, and the SAR radar flight path. The time delay model and phase modulation module of a single deception jamming point are also calculated. Based on the SAR radar repetition rate period, operating frequency, and flight speed, a two-dimensional jamming template is generated using a two-dimensional image. Each point in the two-dimensional image is modulated using the jamming point model to expand it into a two-dimensional surface jamming model. Time delay control and phase modulation are performed on each point in the jamming model to form a two-dimensional jamming template. The system detects SAR signals and intercepts SAR sample signals through signal detection and measurement. The SAR sample signals are convolved with the two-dimensional jamming template to form a jamming baseband signal. An intermediate frequency signal is generated from the jamming baseband signal and then up-converted to emit a jamming radio frequency signal.

[0066] The jammer replicates the detected radar signals, causing them to be transmitted and converge at a single point after range compression. Simultaneously, through time-delay modulation, the jamming point covers the entire protected area. In addition, the jammer modulates the phase of each jamming signal, ensuring that the jamming signal is well coherent with the echo signal in azimuth, so that it also converges at a single point after azimuth compression.

[0067] Specifically, the 8–18 GHz radar jamming system has multi-device collaborative countermeasure capabilities, employing multiple modulation subsystems with three nodes for collaborative jamming, enabling it to counter radars with more than two cancellation functions. During collaborative jamming, each node of the modulation subsystem 3 of the 8–18 GHz radar jamming system operates under the unified control of the control subsystem 1, using unified control commands to achieve collaborative control of multiple sets of equipment.

[0068] In multi-node coordinated jamming, control subsystem 1 connects to four modulation subsystems (3 nodes) to acquire their positions and simultaneously coordinates localization to obtain the radar target's location, thus forming a counter-attack posture. Control subsystem 1, according to the coordinated counter-attack strategy, controls the reconnaissance and jamming timing of each modulation subsystem (3 node) to form a coordinated jamming posture.

[0069] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0070] Although this document frequently uses terms such as control subsystem 1, communication network 2, modulation subsystem 3, control terminal 31, receiving antenna 32, power amplifier main unit 33, transmitting antenna 34, signal processing main unit 4, signal processing board 41, multi-channel receiving module 42, multi-channel transmitting module 43, signal storage card 44, power supply module 45, and generator 46, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. An 8-18 GHz radar jamming system, comprising a control subsystem (1), wherein the control subsystem (1) is connected to several modulation subsystems (3) via a communication network (2), characterized in that, The modulation subsystem (3) has a control terminal (31), which is connected to a signal processing host (4). The signal processing host (4) is connected to a receiving antenna (32) and a transmitting antenna (34) is connected to a power amplifier host (33). The signal processing host (4) includes a signal processing board (41), which is connected to the receiving antenna (32) via a multi-channel receiving module (42). The signal processing board (41) is connected to the power amplifier host (33) via a multi-channel transmitting module (43). The signal processing board (41) is connected to a signal storage card (44). The multi-channel transmitting module (43), the signal processing board (41), and the signal storage card (44) are equipped with a power module (45). The power module (45), the power amplifier host (33), and the control terminal (31) are connected to a generator (46).

2. An 8-18 GHz radar jamming method, employing the 8-18 GHz radar jamming system described in claim 1, characterized in that, Includes the following steps: S1: Signal detection and processing, including signal acquisition, parameter measurement, signal sorting and identification; S2: Interference implementation, including suppressing interference generation and deceiving interference generation; S3: Collaborative work, including single-node mode and multi-node mode.

3. The 8-18 GHz radar jamming method according to claim 2, characterized in that, In step S1, during reconnaissance, the modulation subsystem (3) performs reconnaissance work according to the control requirements after receiving the control command from the control terminal (31). The modulation subsystem (3) controls the direction of the receiving antenna (32) by controlling the servo turntable of the receiving antenna (32) to perform reconnaissance reception and measurement analysis on the incoming wave. The receiving antenna (32) receives the radar signal and inputs it into the signal processing host (4). The multi-channel receiving module (42) performs low-noise amplification, filtering, and down-conversion processing to form 8 intermediate frequency signals. The signal processing board (41) receives the 8 intermediate frequency signals, performs acquisition, channelization, and DDC processing to form the baseband signal to be analyzed, and outputs it to the signal storage card (44) for storage. The signal processing board (41) performs parameter measurement, angle measurement, and analysis processing on the baseband signal to form PWD words. The signal processing board (41) performs signal analysis processing to form EDW and transmits the results to the control terminal (31) to form the reconnaissance results.

4. The 8-18 GHz radar jamming method according to claim 3, characterized in that, In step S1, the radar signal detected by the receiving antenna (32) is used to calculate the direction of arrival of the 8-channel signal by using an interferometer direction finding or spatial spectrum processing algorithm.

5. The 8-18 GHz radar jamming method according to claim 4, characterized in that, In step S1, when each node of the modulation subsystem (3) obtains the arrival time of the radar pulse signal, the control subsystem (1) obtains the radar target position through time difference positioning; when each node of the modulation subsystem (3) obtains the azimuth of the radar signal, the control subsystem (1) obtains the radar target position through cross-positioning algorithm.

6. The 8-18 GHz radar jamming method according to claim 3, characterized in that, The radar signal sorting and identification in step S1 includes the following steps: S11: Radar reconnaissance signal preprocessing, rapid matching of known radars, and pre-sorting of remaining pulses; S12: Known radar signal main processing, inputting the preprocessed known radar PDW sub-stream, performing PRI fine sorting and existence detection, and performing parameter estimation and state analysis; S13: Main processing of unknown radar signals. Input the preprocessed unknown radar PDW sub-stream, perform PRI analysis and sequence detection, then perform radiation source existence determination, parameter estimation and confidence measurement, and finally complete function identification and database update.

7. The 8-18 GHz radar jamming method according to claim 2, characterized in that, In step S2, the receiving antenna (32) receives the target's transmitted signal. When the signal is intercepted, parameter measurement and signal analysis are performed. After the target signal is detected, interference signals are generated in the signal processing board (41) according to the suppression interference algorithm and the deception interference algorithm. The intermediate frequency signal is output and the radio frequency signal is generated through up-conversion processing. The signal is amplified by the power amplifier host (33) and radiated by the transmitting antenna (34) to interfere with the target.

8. The 8-18 GHz radar jamming method according to claim 7, characterized in that, When performing interference suppression in step S2, the interference signal patterns include broadband noise, aiming noise, sweeping noise, comb spectrum noise, and agile noise.

9. The 8-18 GHz radar jamming method according to claim 7, characterized in that, When performing conventional radar deception jamming in step S2, the modulation subsystem (3) receives radar signals, performs signal detection and parameter measurement on the radar signals to obtain target radar information, including radar sample signals, pulse width, and repetition frequency period. Under the control of the jamming strategy, it generates high-fidelity false targets, dense false targets, velocity dragging, range dragging, and range-velocity combined dragging jamming signals to perform deception jamming on conventional radar.

10. The 8-18 GHz radar jamming method according to claim 7, characterized in that, In step S2, when performing SAR radar deception jamming, the target model of the jamming point is calculated based on the false target, the jammer, and the SAR radar flight path. The time delay model and phase modulation module of a single deception jamming point are also calculated. Based on the SAR radar repetition rate period, operating frequency, and flight speed, a two-dimensional jamming template is generated using a two-dimensional image. Each point in the two-dimensional image is modulated using the jamming point model to expand it into a two-dimensional surface jamming model. Time delay control and phase modulation are applied to each point in the jamming model to form a two-dimensional jamming template. The system detects SAR signals and intercepts SAR sample signals through signal detection and measurement. The SAR sample signals are convolved with the two-dimensional jamming template to form a jamming baseband signal. An intermediate frequency signal is generated from the jamming baseband signal and then up-converted to emit a jamming radio frequency signal.

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