Synthetic Aperture Radar (SAR) jamming methods, devices, equipment, media, and software products

Abstract

This disclosure provides a synthetic aperture radar (SAR) jamming method, apparatus, device, medium, and program product, which can be applied to the field of signal processing technology. The SAR jamming method includes: acquiring a target radar signal in response to a SAR-transmitted radar signal; determining range-dimension broadening parameters based on the range-dimension suppression position and range-dimension suppression range of the target suppression region; processing the target radar signal in the range dimension based on the range-dimension broadening parameters to obtain a range-phase mismatch signal; determining a system response function based on the azimuth-dimension suppression position and azimuth-dimension suppression range of the target suppression region; obtaining a frequency domain signal with two-dimensional phase mismatch (range and azimuth) based on the range-phase mismatch signal and the system response function; and performing an inverse Fourier transform on the frequency domain signal with the two-dimensional phase mismatch (range and azimuth) to obtain a relay jamming signal.

Description

Technical Field

[0001] This disclosure relates to the field of signal processing technology, and in particular to a synthetic aperture radar jamming suppression method, apparatus, device, medium, and program product. Background Technology

[0002] Synthetic Aperture Radar (SAR) is a microwave imaging technology that utilizes a radar platform to transmit and receive electromagnetic wave signals during flight. Through signal processing techniques, it synthesizes a larger virtual antenna aperture, thereby achieving higher resolution than a physical antenna. SAR offers advantages such as all-weather, all-day, and long-range high-resolution imaging. SAR can also protect important targets or regions of interest (ROIs) from detection and observation.

[0003] In realizing the concept of this disclosure, the inventors discovered that, based on the effectiveness of the jamming method, SAR jamming can be mainly divided into suppression jamming and deception jamming. In deception jamming, by delaying and modulating the intercepted SAR signal with phase, an echo signal is emitted that mixes with the echo of a false scene or false target designed in the SAR image, increasing the difficulty of identifying key targets. However, in larger scenarios, the hardware cost is high, and phase modulation is difficult to implement quickly. In suppression jamming, the jamming is concentrated in the ROI region, making it impossible to identify and detect important targets within the ROI. Due to the large range of the target suppression area and the mismatch between the target suppression area and the target area, the utilization rate of the jamming energy is low. Summary of the Invention

[0004] In view of the above problems, this disclosure provides a synthetic aperture radar jamming suppression method, apparatus, device, medium and program product.

[0005] According to a first aspect of this disclosure, a synthetic aperture radar (SAR) jamming method is provided, comprising: acquiring a target radar signal in response to a SAR-transmitted radar signal, wherein the target radar signal is a fundamental frequency digital signal intercepted from the radar signal at a jammer; determining a range dimension broadening parameter based on the range dimension suppression position and the range dimension suppression range of the target suppression region; processing the target radar signal in the range dimension based on the range dimension broadening parameter to obtain a range phase mismatch signal, wherein the range phase mismatch signal characterizes a time-domain signal that is phase mismatched with the target radar signal; determining a system response function based on the azimuth dimension suppression position and the azimuth dimension suppression range of the target suppression region; obtaining a range-azimuth two-dimensional phase mismatch frequency domain signal based on the range phase mismatch signal and the system response function, wherein the range-azimuth two-dimensional phase mismatch frequency domain signal characterizes a range-dimensional phase mismatch frequency domain signal modulated by the azimuth dimension phase mismatch system response function; and performing an inverse Fourier transform on the range-azimuth two-dimensional phase mismatch frequency domain signal to obtain a forwarding jamming signal.

[0006] According to embodiments of this disclosure, the above-mentioned range dimension processing of the target radar signal based on the range dimension broadening parameters to obtain a range-phase mismatch signal includes:

[0007] Based on the aforementioned range dimension broadening parameters, the aforementioned target radar signal is extracted and processed to obtain the first target radar signal;

[0008] The radar signal of the first target mentioned above is resampled to obtain the range-phase mismatch signal mentioned above.

[0009] According to embodiments of this disclosure, the determination of the system response function based on the target suppression region's azimuth dimension suppression position and the target suppression region's azimuth dimension suppression range includes:

[0010] Based on the azimuth dimension suppression position and the azimuth dimension suppression range of the target suppression area, determine the azimuth dimension broadening parameter;

[0011] Based on the aforementioned azimuth dimension expansion parameters, the system response function is determined.

[0012] According to embodiments of this disclosure, obtaining the frequency domain signal of the range-azimuth two-dimensional phase mismatch based on the range-phase mismatch signal and the system response function includes:

[0013] Perform a Fourier transform on the above range-phase mismatch signal to obtain the frequency domain range-phase mismatch signal;

[0014] By multiplying the above frequency domain range-phase mismatch signal with the system response function of the longitudinal-azimuth phase mismatch, the frequency domain signal of the range-azimuth two-dimensional phase mismatch is obtained.

[0015] According to embodiments of this disclosure, the above-mentioned acquisition of target radar signals in response to synthetic aperture radar transmitting radar signals includes:

[0016] The radar signal transmitted by the synthetic aperture radar is down-converted to obtain the fundamental frequency signal.

[0017] The aforementioned baseband signal is processed by analog-to-digital conversion to obtain the aforementioned target radar signal.

[0018] A second aspect of this disclosure provides a synthetic aperture radar jamming suppression device, comprising: an acquisition module, a first determination module, a first obtaining module, a second determination module, a second obtaining module, and a third obtaining module.

[0019] The acquisition module is used to acquire a target radar signal in response to the synthetic aperture radar transmitting a radar signal, wherein the target radar signal is a baseband digital signal intercepted from the radar signal at the jammer.

[0020] The first determining module is used to determine the distance dimension broadening parameter based on the target suppression area's distance dimension suppression position and the target suppression area's distance dimension suppression range;

[0021] The first obtaining module is used to process the target radar signal in the range dimension based on the above-mentioned range dimension broadening parameters to obtain a range phase mismatch signal, wherein the above-mentioned range phase mismatch signal represents the time domain signal that is phase mismatched with the target radar signal;

[0022] The second determining module is used to determine the system response function based on the target suppression area's azimuth dimension suppression position and the target suppression area's azimuth dimension suppression range;

[0023] The second obtaining module is used to obtain the frequency domain signal of the range-azimuth two-dimensional phase mismatch based on the above-mentioned range phase mismatch signal and the above-mentioned system response function, wherein the above-mentioned range-azimuth two-dimensional phase mismatch frequency domain signal is characterized as the range-dimensional phase mismatch frequency domain signal modulated by the system response function of the azimuth dimension phase mismatch.

[0024] The third module is used to perform an inverse Fourier transform on the frequency domain signal with the aforementioned two-dimensional phase mismatch between range and azimuth to obtain the forwarding interference signal.

[0025] A third aspect of this disclosure provides an electronic device comprising: one or more processors; and a memory for storing one or more computer programs, wherein the one or more processors execute the one or more computer programs to implement the steps of the method described above.

[0026] A fourth aspect of this disclosure also provides a computer-readable storage medium having a computer program or instructions stored thereon, which, when executed by a processor, implement the steps of the above-described method.

[0027] The fifth aspect of this disclosure also provides a computer program product, including a computer program or instructions that, when executed by a processor, implement the steps of the above-described method.

[0028] According to the synthetic aperture radar (SAR) jamming method, apparatus, equipment, medium, and program products provided in this disclosure, range dimension broadening parameters are determined based on the range dimension suppression position and range dimension suppression range of the target suppression area. Based on the range dimension broadening parameters, the acquired target radar signal is processed in the range dimension to obtain a range phase mismatch signal. Based on the range phase mismatch signal and the system response function determined based on the azimuth dimension suppression position and azimuth dimension suppression range of the target suppression area, a frequency domain signal of two-dimensional phase mismatch in range and azimuth can be obtained. Performing an inverse Fourier transform on the frequency domain signal of two-dimensional phase mismatch in range and azimuth can obtain a relay jamming signal. Based on the relay jamming signal, a target suppression area can be generated, improving the coverage of key targets and reducing energy loss. Attached Figure Description

[0029] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 This diagram schematically illustrates an application scenario of synthetic aperture radar jamming according to embodiments of the present disclosure.

[0031] Figure 2 A flowchart illustrating a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure is shown schematically.

[0032] Figure 3 A schematic diagram illustrates the structure of a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure;

[0033] Figure 4 A flowchart illustrating a synthetic aperture radar jamming suppression method according to yet another embodiment of the present disclosure is shown.

[0034] Figure 5A A pulse width diagram schematically illustrates the process of extracting a target radar signal according to an embodiment of the present disclosure;

[0035] Figure 5B The diagram illustrates a waveform representation of the target radar signal extraction process according to an embodiment of the present disclosure.

[0036] Figure 5C This schematically illustrates a diagram of resampling processing of a first target radar signal according to an embodiment of the present disclosure;

[0037] Figure 6A A simulation diagram illustrating a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure is shown schematically.

[0038] Figure 6B A simulation diagram illustrating a synthetic aperture radar jamming suppression method according to yet another embodiment of the present disclosure is shown.

[0039] Figure 6C A simulation diagram illustrating a synthetic aperture radar jamming suppression method according to yet another embodiment of the present disclosure is shown.

[0040] Figure 6D A simulation diagram illustrating a synthetic aperture radar jamming suppression method according to yet another embodiment of the present disclosure is shown.

[0041] Figure 7 A schematic block diagram of a synthetic aperture radar jamming suppression device according to an embodiment of the present disclosure is shown; and

[0042] Figure 8 A block diagram schematically illustrates an electronic device suitable for implementing a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure. Detailed Implementation

[0043] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0044] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0045] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0046] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0047] In the technical solution disclosed herein, the user information (including but not limited to user personal information, user image information, user device information, such as location information) and data (including but not limited to data used for analysis, stored data, and displayed data) involved are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, storage, use, processing, transmission, provision, disclosure, and application of related data all comply with relevant laws, regulations, and standards, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation entry points are provided for users to choose to authorize or refuse.

[0048] In scenarios involving automated decision-making using personal information, the methods, devices, and systems provided in this disclosure all offer users corresponding entry points for choosing to agree to or reject the automated decision-making results. If the user chooses to reject, the process proceeds to the expert decision-making stage. Here, "automated decision-making" refers to the activity of automatically analyzing and evaluating an individual's behavioral habits, interests, or economic, health, and credit status through computer programs, and then making a decision. Here, "expert decision-making" refers to the activity of making decisions by personnel who specialize in a particular field, possess specialized experience, knowledge, and skills, and have reached a certain level of professional expertise.

[0049] In the process of realizing this disclosure, it was discovered that in related technologies, synthetic aperture radar (SAR) jamming is mainly divided into suppression jamming and deception jamming. Based on SAR suppression jamming methods, the jamming is mainly concentrated in the target area or region of interest (RIO), making it impossible to identify and detect important targets within the ROI. SAR suppression jamming methods are simple and fast to implement, but they achieve this by covering a large area of ​​the scene and hiding important targets. Since there are many useless concealed areas in large-scale scenes, this inevitably leads to a waste of jamming energy. As for SAR deception jamming methods, they mainly use time delay and phase modulation on the intercepted radar signal to emit echo signals that are mixed with the echoes of carefully designed false scenes or false targets in the SAR image, increasing the difficulty of identifying real targets. However, generating a large area of ​​false targets still results in higher hardware costs and system complexity compared to SAR suppression jamming. Furthermore, compared to SAR suppression jamming, SAR deception jamming requires precise phase adjustment, especially under large scene conditions, making it difficult to quickly modulate the false scene.

[0050] In view of this, embodiments of the present disclosure provide a synthetic aperture radar (SAR) jamming method, comprising: acquiring a target radar signal in response to a SAR-transmitted radar signal, wherein the target radar signal is a fundamental frequency digital signal intercepted from the radar signal at a jammer; determining a range dimension broadening parameter based on the range dimension suppression position and the range dimension suppression range of the target suppression region; processing the target radar signal in the range dimension based on the range dimension broadening parameter to obtain a range phase mismatch signal, wherein the range phase mismatch signal represents a time-domain signal that is phase mismatched with the target radar signal; determining a system response function based on the azimuth dimension suppression position and the azimuth dimension suppression range of the target suppression region; obtaining a range-azimuth two-dimensional phase mismatch frequency domain signal based on the range phase mismatch signal and the system response function, wherein the range-azimuth two-dimensional phase mismatch frequency domain signal represents a range-dimensional phase mismatch frequency domain signal modulated by the system response function of the azimuth dimension phase mismatch; and performing an inverse Fourier transform on the range-azimuth two-dimensional phase mismatch frequency domain signal to obtain a forwarding jamming signal.

[0051] Figure 1 The diagram illustrates an application scenario of synthetic aperture radar (SAR) jamming suppression according to an embodiment of the present disclosure.

[0052] like Figure 1As shown, application scenario 100 according to this embodiment may include a first terminal device 101, a second terminal device 102, a third terminal device 103, a network 104, and a server 105. The network 104 serves as a medium for providing a communication link between the first terminal device 101, the second terminal device 102, the third terminal device 103, and the server 105. The network 104 may include various connection types, such as wireless communication links or fiber optic cables, etc.

[0053] Users can use the first terminal device 101, the second terminal device 102, and the third terminal device 103 to interact with the server 105 through the network 104 to receive or send messages, etc.

[0054] Server 105 can be a server that provides various services. The backend management server can analyze and process data such as received user requests, and then feed the processing results back to the terminal devices.

[0055] It should be noted that the synthetic aperture radar (SAR) jamming method provided in this embodiment can generally be executed by server 105. Correspondingly, the SAR jamming device provided in this embodiment can generally be located in server 105. The SAR jamming method provided in this embodiment can also be executed by a server or server cluster that is different from server 105 and capable of communicating with the first terminal device 101, the second terminal device 102, the third terminal device 103, and / or server 105. Correspondingly, the SAR jamming device provided in this embodiment can also be located in a server or server cluster that is different from server 105 and capable of communicating with the first terminal device 101, the second terminal device 102, the third terminal device 103, and / or server 105.

[0056] It should be understood that Figure 1 The number of terminal devices, networks, and servers shown is merely illustrative. Depending on implementation needs, any number of terminal devices, networks, and servers can be included.

[0057] The following will be based on Figure 1 The described scene, through Figures 2 to 6D The synthetic aperture radar jamming suppression method of the disclosed embodiments is described in detail.

[0058] Figure 2 A flowchart illustrating a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure is shown.

[0059] like Figure 2 As shown, the synthetic aperture radar jamming suppression method 200 includes operations S210 to S260.

[0060] In operation S210, in response to the synthetic aperture radar transmitting radar signals, the target radar signals are acquired.

[0061] In operation S220, the distance dimension broadening parameter is determined based on the target suppression area's distance dimension suppression position and the target suppression area's distance dimension suppression range.

[0062] In operation S230, based on the range dimension broadening parameter, the target radar signal is processed in the range dimension to obtain the range phase mismatch signal.

[0063] In operation S240, the system response function is determined based on the target suppression area's azimuth dimension suppression position and the target suppression area's azimuth dimension suppression range.

[0064] By operating S250, the frequency domain signal of the two-dimensional phase mismatch between range and azimuth is obtained based on the range phase mismatch signal and the system response function.

[0065] In operation S260, an inverse Fourier transform is performed on the frequency domain signal with two-dimensional phase mismatch in range and azimuth to obtain the forwarding interference signal.

[0066] According to embodiments of this disclosure, synthetic aperture radar (SAR) is an active Earth observation system that can be installed on flight platforms such as aircraft, satellites, and spacecraft. SAR can transmit and receive electromagnetic wave signals through a moving antenna, and coherently process the echoes received at different locations to obtain a high-resolution imaging radar. A jammer can characterize electronic devices that transmit or relay electronic jamming signals, used to disrupt or deceive enemy electronic equipment, thereby reducing its effectiveness.

[0067] According to embodiments of this disclosure, synthetic aperture radar can be used to transmit radar signals. The target radar signal can be a portion of the radar signal. The target radar signal can be a baseband digital signal intercepted from the radar signal at a jammer. The key target can characterize an area or object to be protected.

[0068] According to embodiments of this disclosure, the distance dimension broadening parameter K′ can be determined using the following formula (1) based on the target suppression region's distance dimension suppression position and the target suppression region's distance dimension suppression range. r .

[0069]

[0070] Among them, K r The signal transmitted by the synthetic aperture radar is represented by the chirp rate, T represents the pulse width, c represents the speed of light, and L represents the pulse width. r This indicates the distance broadening information caused by phase mismatch in the distance dimension.

[0071] According to embodiments of this disclosure, based on the above formula (1), when the target suppression region's distance dimension suppression position and range are determined, the distance broadening information caused by distance dimension phase mismatch can be determined, and thus the distance dimension broadening parameter can be determined. Furthermore, the target suppression region's distance dimension suppression position and range can be adjusted according to the size and location of the key target, thereby determining different distance dimension broadening parameters, and thus enabling the protection of different key targets.

[0072] According to embodiments of this disclosure, the range-phase mismatch signal can characterize the time-domain signal that is phase-mismatched with the target radar signal. Based on the range dimension broadening parameter, the target radar signal can be processed in the range dimension to obtain the range-phase mismatch signal.

[0073] According to embodiments of this disclosure, the frequency domain s of the fundamental frequency of the distance phase mismatch signal is... r (f r ;t a Formula (2) is as follows:

[0074]

[0075] Wherein, K′ r K′ represents the chirp rate of the range-phase mismatch signal. r =B2 / T, where B2 represents the bandwidth of the range-phase mismatch signal, f r Represents the frequency of the distance dimension, t a R(t) represents the slow motion moment of the synthetic aperture radar. a The distance between the synthetic aperture radar and the jammer is represented at different motion times.

[0076] According to embodiments of this disclosure, the target suppression region can characterize a region composed of multiple interference points. Given that the azimuth suppression position and the azimuth suppression range of the target suppression region are determined, the mismatch velocity and azimuth position change can be determined, thereby determining the azimuth expansion parameter, and thus determining the system response function, H(x, y; f). r , t a ), as shown in formula (3):

[0077]

[0078] Where σ(x, y) represents the distribution of interference points, f c Represents the carrier frequency, ΔR(x, y; t). a ) represents the difference between the real-time distance between the synthetic aperture radar and the jamming point and the real-time distance between the synthetic aperture radar and the jammer.

[0079] According to embodiments of this disclosure, the difference ΔR(x, y; t) between the real-time distance between the synthetic aperture radar and the jamming point and the real-time distance between the synthetic aperture radar and the jammer position is... a ), as shown in formula (4):

[0080]

[0081] in, v m R represents the mismatch velocity, v represents the moving speed of the synthetic aperture radar, and R represents the moving speed of the synthetic aperture radar. s This represents the shortest slant range from the synthetic aperture radar to the jammer.

[0082] According to embodiments of this disclosure, the frequency domain signal of the range-azimuth two-dimensional phase mismatch can be characterized as the frequency domain signal of the range-dimensional phase mismatch modulated by the system response function of the azimuth-dimensional phase mismatch. Based on the range-azimuth two-dimensional phase mismatch signal and the system response function, the frequency domain signal of the range-azimuth two-dimensional phase mismatch, s, can be obtained. t (f r ;t a ), as shown in formula (5):

[0083]

[0084] According to embodiments of this disclosure, an inverse Fourier transform of the frequency domain signal with two-dimensional phase mismatch in range and azimuth can yield the forwarding interference signal s. t (t;t a ), as shown in formula (6):

[0085] S t (t;t a =IFFT[S t (f r ;t a (6)

[0086] Where IFFT[] represents the inverse Fourier transform, and t represents time.

[0087] According to embodiments of this disclosure, a range dimension broadening parameter can be determined based on the range dimension suppression position and range dimension suppression range of the target suppression area. Based on the range dimension broadening parameter, the acquired target radar signal is processed in the range dimension to obtain a range phase mismatch signal. Based on the range phase mismatch signal and the system response function determined based on the azimuth dimension suppression position and azimuth dimension suppression range of the target suppression area, a frequency domain signal of two-dimensional phase mismatch in range and azimuth can be obtained. An inverse Fourier transform is performed on the frequency domain signal of two-dimensional phase mismatch in range and azimuth to obtain a forwarding jamming signal. Based on the forwarding jamming signal, a target suppression area matching the size of the key target can be generated, improving the coverage of the key target and reducing energy loss.

[0088] According to embodiments of this disclosure, range-dimensional processing is performed on the target radar signal based on range-dimensional broadening parameters to obtain a range-phase mismatch signal. This includes: extracting the target radar signal based on range-dimensional broadening parameters to obtain a first target radar signal; and resampling the first target radar signal to obtain the range-phase mismatch signal.

[0089] According to embodiments of this disclosure, the target radar signal can be extracted and processed based on the range dimension broadening parameter to obtain the first target radar signal.

[0090] According to embodiments of this disclosure, a target radar signal can be obtained by intercepting radar signals transmitted from a synthetic aperture radar. Interception of the target radar signal is the process of extracting a segment of the radar signal. When the pulse width of the target radar signal is T1, the bandwidth corresponding to the target radar signal is B1, which can be expressed as B1 = BT1 / T, where B represents the bandwidth of the radar signal. Since jammers typically sample radar signals at a fixed sampling frequency, at a sampling frequency of F... s In this case, the sampling time sequence of the radar signal is [0, 1 / F]. s , 2 / F s After extracting the radar signal, the first target radar signal can be obtained. The sampling time series of the target radar signal is T. old = [0, 1 / F s , 2 / F s [T1, ..., T1], extract the target radar signal to obtain the first target radar signal, that is, scale the sampling time series of the target radar signal to form a new time series T. new =[0, T / F s T1, 2T / F s [T1, ..., T], that is, the sampling time sequence of the radar signal of the first target is T. new .

[0091] According to embodiments of this disclosure, resampling can characterize sampling of a signal at a different frequency. Resampling the first target radar signal can change its frequency, thereby adjusting its bandwidth and obtaining a range-phase mismatch signal. This is achieved by resampling the first target radar signal with a new time series T. new Resampling is performed to adjust the bandwidth. Since the bandwidth of the target radar signal can be expressed as B1 = BT1 / T, the bandwidth of the range-phase mismatch signal obtained after resampling is further reduced by a factor of T1 / T. The bandwidth of the range-phase mismatch signal obtained after resampling is B2 = (T1 / T). 2 B.

[0092] According to embodiments of this disclosure, by extracting the target radar signal, a first target radar signal sampled with a new sampling time sequence can be obtained. By resampling the first target radar signal, a range phase mismatch signal that is mismatched with the range phase of the target radar signal can be obtained. Based on the range phase mismatch signal, the range dimension of the target suppression area can be suppressed, thereby improving the range dimension coverage of key targets and reducing the energy loss in the range dimension.

[0093] According to embodiments of this disclosure, determining the system response function based on the target suppression region's azimuth suppression position and azimuth suppression range includes: determining an azimuth expansion parameter based on the target suppression region's azimuth suppression position and azimuth suppression range; and determining the system response function based on the azimuth expansion parameter.

[0094] According to embodiments of this disclosure, using formula (7), an azimuth expansion parameter can be determined based on the azimuth expansion position and the azimuth expansion range of the target suppression area. The azimuth expansion parameter may include the mismatch velocity v. m .

[0095]

[0096] Among them, T a Let L represent the synthetic aperture time, v represent the velocity of the synthetic aperture radar, and L represent the speed of motion of the radar. a This indicates the information on the widening of the range and azimuth dimensions caused by the mismatch between the range and phase dimensions.

[0097] According to the embodiments of this disclosure, due to the existence of mismatched speeds, i.e., speed mismatch, the target azimuth position changes. Compared with the original azimuth position, the azimuth change Δx is as follows: (8)

[0098]

[0099] Where x represents the azimuth dimension of the target suppression area and the suppression position.

[0100] According to embodiments of this disclosure, the system response function can be determined when the orientation dimension broadening parameter is determined.

[0101] According to embodiments of this disclosure, the azimuth dimension broadening parameter can be determined based on the target suppression azimuth dimension suppression position and the target suppression area azimuth dimension suppression range, thereby determining the system response function. This improves the flexibility of the system response function, enhances the accuracy of the range-azimuth two-dimensional coverage of key targets, and reduces the energy loss in the range-azimuth two-dimensional coverage.

[0102] According to embodiments of this disclosure, obtaining a frequency domain signal of two-dimensional phase mismatch (range and azimuth) based on the range-phase mismatch signal and the system response function includes: performing a Fourier transform on the range-phase mismatch signal to obtain a frequency domain range-phase mismatch signal; and multiplying the frequency domain range-phase mismatch signal with the system response function of the azimuth-dimensional phase mismatch to obtain the frequency domain signal of two-dimensional phase mismatch (range and azimuth).

[0103] According to embodiments of this disclosure, the frequency domain range phase mismatch signal can characterize the frequency domain of the range phase mismatch signal. A Fourier transform of the range phase mismatch signal yields the frequency domain range phase mismatch signal, and the fundamental frequency of the frequency domain range phase mismatch signal is shown in formula (2) above.

[0104] According to an embodiment of this disclosure, by multiplying the frequency domain range phase mismatch signal and the system response function of the azimuth dimension phase mismatch, the frequency domain signal of the range-azimuth two-dimensional phase mismatch can be obtained, as shown in the above formula (5).

[0105] According to embodiments of this disclosure, since the range phase mismatch signal will have a residual secondary phase after being matched and filtered by the range dimension matched filtering function, it will become wider in the range dimension, as shown in the following formula (9):

[0106]

[0107] in, τ1=R(t a ) / c represents the delay from synthetic aperture radar to jammer.

[0108] According to embodiments of this disclosure, the distance dimension matched filtering function H r Formula (10) is as follows:

[0109]

[0110] According to embodiments of this disclosure, the target point can be a point within a target region. The target point, based on its widening information in the distance dimension, can form a false image within the target region to increase the difficulty of identifying the target region. From the above formula (1), the widening information of the target point in the distance dimension is L. r .

[0111] According to an embodiment of this disclosure, the range-phase mismatch signal is subjected to a Fourier transform in the azimuth dimension to the azimuth frequency domain, as shown in the following formula (11):

[0112]

[0113] in, K a =2v 2 / λR s K′ represents the original azimuth chirp rate. a = f represents the chirp rate in the azimuth dimension. a Indicates the azimuth dimension frequency.

[0114] According to the embodiments of this disclosure, due to the velocity mismatch in the azimuth dimension, the range-phase mismatch signal in the azimuth frequency domain will have residual secondary phase after being matched and filtered by the azimuth dimension matched filter, resulting in broadening in the azimuth dimension, as shown in the following formula (12):

[0115]

[0116] According to embodiments of this disclosure, the frequency domain H of the azimuth dimension matched filter function a (f a ), as shown in formula (13):

[0117]

[0118] Among them, f a Indicates the azimuth dimension frequency.

[0119] According to embodiments of this disclosure, the target point can form a false image in the target area based on the widening information in the range-orientation dimension, thereby increasing the difficulty of identifying the target area. The widening information L of the target point in the range-orientation dimension can be obtained from the above formula (7). a .

[0120] According to embodiments of this disclosure, a frequency domain range-phase mismatch signal can be obtained by performing a Fourier transform on the range-phase mismatch signal. By multiplying the frequency domain range-phase mismatch signal with the system response function, a frequency domain signal of two-dimensional range-azimuth phase mismatch can be obtained, which improves the accuracy of coverage of key targets in the azimuth and range dimensions and reduces energy loss in the range dimension.

[0121] According to embodiments of this disclosure, there may be multiple key targets, and multiple target suppression regions corresponding to the key targets. Therefore, the suppression position in the distance dimension can be adjusted by adjusting the vertical coordinate of the interference points; the suppression position in the azimuth dimension can be adjusted by adjusting the horizontal coordinate position and change of the interference points; the distance broadening information can be controlled by adjusting the extraction time; and the distance and azimuth broadening information can be adjusted by adjusting the mismatch speed. Therefore, when key targets are determined, target suppression regions matching the key targets can be formed based on their location and size, thereby protecting the key targets.

[0122] According to embodiments of this disclosure, in response to a synthetic aperture radar (SAR) transmitting a radar signal, acquiring a target radar signal includes: performing down-conversion processing on the SAR-transmitted radar signal to obtain a baseband signal; and performing analog-to-digital conversion processing on the baseband signal to obtain the target radar signal.

[0123] According to embodiments of this disclosure, downconversion processing characterizes the conversion of a higher frequency signal to a lower frequency signal, and can be implemented using a mixer. Downconversion can be a single operation or multiple operations. By performing downconversion processing on the signal transmitted by the synthetic aperture radar, a baseband signal can be obtained. Analog-to-digital conversion processing characterizes the conversion of an analog signal into a digital signal. By performing analog-to-digital conversion processing on the baseband signal, the target radar signal can be obtained.

[0124] According to embodiments of this disclosure, by down-converting the radar signal emitted by the synthetic aperture radar, a baseband signal can be obtained. By performing analog-to-digital conversion on the baseband signal, the target radar signal can be obtained, thereby reducing the frequency of the radar signal.

[0125] Figure 3 A schematic diagram of a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure is shown.

[0126] like Figure 3 As shown in the diagram 300, the structure of the synthetic aperture radar jamming suppression method includes an amplification module 301, a down-conversion module 302, an analog-to-digital (A / D) conversion module 303, an extraction and resampling module 304, a fast Fourier transform (FFT) module 305, a system response function module 306, a system parameter module 307, a modulation parameter module 308, a product module 309, an inverse fast Fourier transform (IFFT) module 310, a digital-to-analog (D / A) conversion module 311, an up-conversion module 312, and a gain control module 313.

[0127] According to embodiments of this disclosure, the target radar signal can be amplified by amplification module 301, down-converted by down-converter module 302 to obtain a fundamental frequency time-domain signal, analog-to-digital conversion by A / D module 303, extraction and resampling by extraction and resampling module 304 to obtain range-phase mismatch signal, and fast Fourier transform module 305 to perform Fourier transform on range-phase mismatch signal to obtain frequency-domain range-phase mismatch signal. The fundamental frequency of the range-phase mismatch signal in the frequency domain is multiplied by the system response function generated by the system response function module 306 in the product module 309. The inverse fast Fourier transform module 310 performs an inverse Fourier transform on the range-azimuth two-dimensional phase mismatch signal in the frequency domain to obtain the relay jamming signal. The D / A module 311 performs digital-to-analog conversion on the relay jamming signal. The up-conversion module 312 up-converts the digital-to-analog converted relay jamming signal. The gain control module 313 amplifies the up-converted signal to obtain the radio frequency signal for transmission. The system parameter module 307 obtains the frequency response of the jammer from the synthetic aperture radar system parameters and the modulation parameter module 308 obtains the jamming modulation parameters. The jamming function module 306 generates the system response function. The system parameter module 307 may include parameters such as SAR platform speed, carrier frequency, pulse duration, chirp rate, and repetition rate. The modulation parameter module 308 may include parameters such as the location of key targets and the target suppression area.

[0128] Figure 4 A flowchart illustrating a synthetic aperture radar jamming suppression method according to yet another embodiment of the present disclosure is shown.

[0129] like Figure 4 As shown, the flowchart 400 of the synthetic aperture radar jamming suppression method includes operations S410 to S460.

[0130] The S410 is used to intercept radar signals and acquire target radar signals.

[0131] The S420 is used to extract and process the target radar signal.

[0132] During operation of S430, time scaling processing is performed on the extracted and processed target radar to obtain the first target radar signal.

[0133] During operation of S440, the radar signal of the first target is resampled to obtain the range phase mismatch signal.

[0134] When operating the S450, phase mismatch modulation is performed on the range phase mismatch signal to obtain the forwarding interference signal.

[0135] When operating S460, the interference signal is forwarded.

[0136] According to embodiments of this disclosure, phase mismatch modulation of the range-phase mismatch signal can be a process of multiplying the range-phase mismatch signal with the system response function to obtain a frequency domain signal with two-dimensional phase mismatch in range and azimuth.

[0137] Figure 5A A pulse width diagram illustrating the extraction process of a target radar signal according to an embodiment of the present disclosure is shown schematically.

[0138] like Figure 5A As shown, the pulse width of the target radar signal is T, and the corresponding bandwidth is B. By extracting the target radar signal, that is, adjusting the pulse width T of the target radar signal to T1, the pulse width of the first target radar signal is T1, and the corresponding bandwidth B is also adjusted to B1, that is, the bandwidth corresponding to the first target radar signal is B1.

[0139] Figure 5B The diagram illustrates a waveform of the target radar signal extraction process according to an embodiment of the present disclosure.

[0140] like Figure 5B As shown, the first target radar signal is obtained by extracting the target radar signal. The first target radar signal is the part within the black box in the target radar signal.

[0141] Figure 5C A schematic diagram illustrating the resampling process of a first target radar signal according to an embodiment of the present disclosure is shown.

[0142] like Figure 5C As shown, after resampling the first target radar signal, a range phase mismatch signal can be obtained. The first target radar signal and the range phase mismatch signal have different frequencies.

[0143] Table 1 Simulation parameters for synthetic aperture radar jamming method

[0144]

[0145] Figures 6A-6D A simulation diagram illustrating a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure is shown.

[0146] According to embodiments of this disclosure, in Figures 6A-6D In the diagram, the horizontal axis represents the distance range, and the vertical axis represents the azimuth.

[0147] like Figure 6A As shown in Table 1, with simulation parameters B1 = 0.9B and v... mA schematic diagram of the target suppression area at a speed of 144.2 m / s.

[0148] like Figure 6B As shown in Table 1, with simulation parameters B1 = 0.95B and v... m A schematic diagram of the target suppression area at a speed of 144.2 m / s.

[0149] like Figure 6C As shown in Table 1, with simulation parameters B1 = 0.95B and v... m A schematic diagram of the target suppression area at a speed of 138.3 m / s.

[0150] like Figure 6D As shown in Table 1, with simulation parameters B1 = 0.9B and v... m A schematic diagram of the target suppression area at a speed of 138.3 m / s.

[0151] like Figures 6A-6D As shown, the range and position of the target suppression area can be adjusted by adjusting the pulse width and mismatch speed, thereby enabling the protection of different key targets.

[0152] Based on the above-described synthetic aperture radar (SAR) jamming suppression method, this disclosure also provides a SAR jamming suppression device. The following will be combined with... Figure 7 The device is described in detail.

[0153] Figure 7 A schematic block diagram of a synthetic aperture radar jamming device according to an embodiment of the present disclosure is shown.

[0154] like Figure 7 As shown, the synthetic aperture radar jamming device 700 of this embodiment includes an acquisition module 710, a first determination module 720, a first obtaining module 730, a second determination module 740, a second obtaining module 750, and a third obtaining module 760.

[0155] The acquisition module 710 is configured to acquire a target radar signal in response to a synthetic aperture radar transmitting a radar signal, wherein the target radar signal is a baseband digital signal intercepted from the radar signal at the jammer. In one embodiment, the acquisition module 710 may be used to perform the operation S210 described above, which will not be repeated here.

[0156] The first determining module 720 is used to determine the distance dimension broadening parameter based on the target suppression region's distance dimension suppression position and the target suppression region's distance dimension suppression range. In one embodiment, the first determining module 720 can be used to perform the operation S220 described above, which will not be repeated here.

[0157] The first obtaining module 730 is used to process the target radar signal in the range dimension based on the range dimension broadening parameter to obtain a range phase mismatch signal, wherein the range phase mismatch signal represents the time-domain signal that is phase mismatched with the target radar signal. In one embodiment, the first obtaining module 730 can be used to perform the operation S230 described above, which will not be repeated here.

[0158] The second determining module 740 is used to determine the system response function based on the target suppression area's azimuth dimension suppression position and the target suppression area's azimuth dimension suppression range. In one embodiment, the second determining module 740 can be used to execute the operation S240 described above, which will not be repeated here.

[0159] The second obtaining module 750 is used to obtain a frequency domain signal of two-dimensional phase mismatch (range and azimuth) based on the range-phase mismatch signal and the system response function. The frequency domain signal of the two-dimensional phase mismatch is characterized as a frequency domain signal of range-dimensional phase mismatch modulated by the system response function of the azimuth-dimensional phase mismatch. In one embodiment, the second obtaining module 750 can be used to perform the operation S250 described above, which will not be repeated here.

[0160] The third obtaining module 760 is used to perform an inverse Fourier transform on the frequency domain signal with two-dimensional phase mismatch in range and azimuth to obtain the relay interference signal. In one embodiment, the third obtaining module 760 can be used to perform the operation S260 described above, which will not be repeated here.

[0161] According to embodiments of this disclosure, the first obtaining module 730 includes:

[0162] The first submodule is used to extract and process the target radar signal based on the range dimension broadening parameter to obtain the first target radar signal;

[0163] The second submodule is used to resample the radar signal of the first target to obtain the range phase mismatch signal.

[0164] According to embodiments of this disclosure, the second determining module 740 includes:

[0165] The first determining submodule is used to extract and process the target radar signal based on the range dimension broadening parameter to obtain the first target radar signal;

[0166] The second determination submodule is used to resample the radar signal of the first target to obtain the range phase mismatch signal.

[0167] According to embodiments of this disclosure, the second obtaining module 750 includes:

[0168] The third submodule is used to perform Fourier transform on the range-phase mismatch signal to obtain the frequency domain range-phase mismatch signal;

[0169] The fourth submodule is used to perform a product operation on the frequency domain range-phase mismatch signal and the system response function of the longitudinal-azimuth phase mismatch to obtain the frequency domain signal of the range-azimuth two-dimensional phase mismatch.

[0170] According to embodiments of this disclosure, the acquisition module 710 includes:

[0171] The first acquisition submodule is used to perform down-conversion processing on the radar signal transmitted by the synthetic aperture radar to obtain the baseband signal;

[0172] The second acquisition submodule is used to perform analog-to-digital conversion on the baseband signal to obtain the target radar signal.

[0173] According to embodiments of this disclosure, any plurality of modules among the acquisition module 710, the first determining module 720, the first obtaining module 730, the second determining module 740, the second obtaining module 750, and the third obtaining module 760 can be combined into one module, or any one of these modules can be split into multiple modules. Alternatively, at least part of the functionality of one or more of these modules can be combined with at least part of the functionality of other modules and implemented in one module. According to embodiments of this disclosure, at least one of the acquisition module 710, the first determining module 720, the first obtaining module 730, the second determining module 740, the second obtaining module 750, and the third obtaining module 760 can be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or implemented in hardware or firmware by any other reasonable means of integrating or packaging the circuitry, or implemented in any one of software, hardware, and firmware methods, or in a suitable combination of any of these methods. Alternatively, at least one of the acquisition module 710, the first determination module 720, the first obtaining module 730, the second determination module 740, the second obtaining module 750, and the third obtaining module 760 may be at least partially implemented as a computer program module, which can perform corresponding functions when the computer program module is run.

[0174] Figure 8 A block diagram schematically illustrates an electronic device suitable for implementing a synthetic aperture radar jamming suppression method according to an embodiment of the present disclosure.

[0175] like Figure 8As shown, an electronic device 800 according to an embodiment of this disclosure includes a processor 801, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 802 or a program loaded from a storage portion 808 into a random access memory (RAM) 803. The processor 801 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 801 may also include onboard memory for caching purposes. The processor 801 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of this disclosure.

[0176] RAM 803 stores various programs and data required for the operation of electronic device 800. Processor 801, ROM 802, and RAM 803 are interconnected via bus 804. Processor 801 performs various operations of the method flow according to embodiments of the present disclosure by executing programs in ROM 802 and / or RAM 803. It should be noted that the programs may also be stored in one or more memories other than ROM 802 and RAM 803. Processor 801 may also perform various operations of the method flow according to embodiments of the present disclosure by executing programs stored in said one or more memories.

[0177] According to embodiments of this disclosure, the electronic device 800 may further include an input / output (I / O) interface 805, which is also connected to a bus 804. The electronic device 800 may also include one or more of the following components connected to the I / O interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 810 as needed so that computer programs read from it can be installed into the storage section 808 as needed.

[0178] This disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0179] According to embodiments of this disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of this disclosure, the computer-readable storage medium may include ROM 802 and / or RAM 803 and / or one or more memories other than ROM 802 and RAM 803 described above.

[0180] Embodiments of this disclosure also include a computer program product comprising a computer program containing program code for performing the methods shown in the flowchart. When the computer program product is run on a computer system, the program code is used to enable the computer system to implement the synthetic aperture radar jamming suppression method provided in the embodiments of this disclosure.

[0181] When the computer program is executed by the processor 801, it performs the functions defined in the system / apparatus of this disclosure embodiments. According to embodiments of this disclosure, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0182] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and may be downloaded and installed via the communication section 809, and / or installed from a removable medium 811. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0183] In such an embodiment, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by processor 801, it performs the functions defined in the system of this disclosure embodiment. According to embodiments of this disclosure, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0184] According to embodiments of this disclosure, program code for executing the computer programs provided in embodiments of this disclosure can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can execute entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0185] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0186] Those skilled in the art will understand that the features described in the various embodiments of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments of this disclosure can be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0187] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A method for suppressing jamming with synthetic aperture radar, characterized in that, include: In response to a synthetic aperture radar transmitting a radar signal, a target radar signal is acquired, wherein the target radar signal is a baseband digital signal intercepted from the radar signal at a jammer; Based on the target suppression region's distance dimension suppression location and the target suppression region's distance dimension suppression range, determine the distance dimension broadening parameters; Based on the range dimension broadening parameter, the target radar signal is processed in the range dimension to obtain a range phase mismatch signal, wherein the range phase mismatch signal represents the time domain signal that is phase mismatched with the target radar signal; The system response function is determined based on the target suppression area's azimuth dimension suppression location and the target suppression area's azimuth dimension suppression range; Based on the range-azimuth two-dimensional phase mismatch signal and the system response function, a frequency domain signal of range-azimuth two-dimensional phase mismatch is obtained, wherein the frequency domain signal of range-azimuth two-dimensional phase mismatch is characterized as a frequency domain signal of range-dimensional phase mismatch modulated by the system response function of azimuth-dimensional phase mismatch. The frequency domain signal with two-dimensional phase mismatch in range and azimuth is subjected to inverse Fourier transform to obtain the forwarding interference signal.

2. The method according to claim 1, characterized in that, The process of processing the target radar signal in the range dimension based on the range dimension broadening parameter to obtain a range-phase mismatch signal includes: Based on the range dimension broadening parameter, the target radar signal is extracted and processed to obtain the first target radar signal; The range phase mismatch signal is obtained by resampling the radar signal of the first target.

3. The method according to claim 1, characterized in that, The determination of the system response function based on the target suppression area's azimuth dimension suppression position and the target suppression area's azimuth dimension suppression range includes: Based on the azimuth dimension suppression position and the azimuth dimension suppression range of the target suppression area, determine the azimuth dimension broadening parameter; The system response function is determined based on the azimuth dimension broadening parameter.

4. The method according to claim 3, characterized in that The step of obtaining the frequency domain signal of the range-azimuth two-dimensional phase mismatch based on the range-phase mismatch signal and the system response function includes: Perform a Fourier transform on the range-phase mismatch signal to obtain the frequency domain range-phase mismatch signal; The frequency domain range-phase mismatch signal is multiplied by the system response function of the longitudinal-azimuth phase mismatch to obtain the frequency domain signal of the range-azimuth two-dimensional phase mismatch.

5. The method according to claim 1, characterized in that, The step of acquiring the target radar signal in response to the synthetic aperture radar transmitting radar signal includes: The radar signal transmitted by the synthetic aperture radar is down-converted to obtain the baseband signal; The baseband signal is subjected to analog-to-digital conversion to obtain the target radar signal.

6. A synthetic aperture radar jamming device, characterized in that, The device includes: An acquisition module is used to acquire a target radar signal in response to a synthetic aperture radar transmitting a radar signal, wherein the target radar signal is a baseband digital signal intercepted from the radar signal at a jammer; The first determining module is used to determine the distance dimension broadening parameter based on the target suppression area's distance dimension suppression position and the target suppression area's distance dimension suppression range; The first obtaining module is used to process the target radar signal in the range dimension based on the range dimension broadening parameter to obtain a range phase mismatch signal, wherein the range phase mismatch signal represents a time-domain signal that is phase mismatched with the target radar signal; The second determining module is used to determine the system response function based on the target suppression area's azimuth dimension suppression position and the target suppression area's azimuth dimension suppression range; The second obtaining module is used to obtain a frequency domain signal of two-dimensional phase mismatch of range and azimuth based on the range phase mismatch signal and the system response function, wherein the frequency domain signal of two-dimensional phase mismatch of range and azimuth is characterized as a frequency domain signal of range phase mismatch modulated by the system response function of azimuth phase mismatch. The third module is used to perform an inverse Fourier transform on the frequency domain signal with two-dimensional phase mismatch in range and azimuth to obtain a forwarding interference signal.

7. An electronic device, comprising: One or more processors; Memory, used to store one or more computer programs. The characteristic feature is that the one or more processors execute the one or more computer programs to implement the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed by a processor, they implement the steps of the method according to any one of claims 1 to 5.

9. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by a processor, they implement the steps of the method according to any one of claims 1 to 5.

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