Regional adjustable intermittent sampling interference method and system for SAR (Synthetic Aperture Radar) platform of unmanned aerial vehicle

Abstract

The invention discloses a regional adjustable intermittent sampling interference method and system for an unmanned aerial vehicle SAR platform, and the method specifically comprises the steps: generating radar original data according to an intercepted unmanned aerial vehicle carried SAR signal; adopting a Bernoulli mapping sequence to carry out intermittent sampling on SAR signals of the unmanned aerial vehicle, and generating a randomly distributed non-uniform false target group; according to the generated intermittent sampling signal controlled by the Bernoulli mapping sequence, the distance direction and the azimuth direction of the SAR signal are interfered by using a distance direction frequency shift and false motion target characteristic modulation method, and a smart interference signal controlled by the Bernoulli mapping sequence after modulation is generated, so that the interference signal has a false motion characteristic; and after digital-to-analog conversion, low-pass filtering and up-conversion processing are carried out on the generated interference signal, the interference signal is sent by using a transmitting antenna, and interference on the SAR platform radar of the unmanned aerial vehicle is completed. The real moving target in the specific area is protected, and the method has the advantages of being simple, high in real-time performance and good in interference effect.

Description

Technical Field

[0001] The present invention relates to the field of radar jamming technology in electronic countermeasures, and in particular to a method and system for regionally adjustable intermittent sampling jamming of an unmanned aerial vehicle (UAV) SAR platform. Background Art

[0002] Unmanned aerial vehicles, or "drones" for short, are unmanned aircraft that are controlled by radio remote control equipment and self-contained program control devices, or are operated completely or intermittently autonomously by onboard computers. Compared with manned aircraft, drones are more suitable for performing high-risk military missions and supporting the penetration of combat forces in a coordinated combat mode. The synthetic aperture radar ground motion target detection SAR-GMTI system can not only image stationary targets on the ground, but also obtain information on ground motion targets and perceive the battlefield situation. By carrying detection equipment such as SAR, drones can take the lead in breaking into enemy airspace and perform battlefield information reconnaissance missions. The detection of drones equipped with the SAR-GMTI system will pose a major threat to one's own military targets, so interference measures need to be taken to protect important military targets on the ground.

[0003] As an important means to counter radar, intermittent sampling and forwarding jammers use digital radio frequency storage technology to intermittently sample and forward radar signals, thereby generating a string of false targets to achieve a deception effect. However, the distribution pattern of the false target strings generated by ordinary intermittent sampling and forwarding jammers is easy to be identified by radars. Therefore, it is necessary to design jammers that can generate irregular false targets with controllable false target jamming areas and positions, so as to more effectively jam the SAR system carried by drones. Summary of the invention

[0004] The purpose of the present invention is to provide a non-uniform multi-false target group that can generate a random distribution, effectively solve the regular distribution problem of multiple false targets, make the interference signal have characteristics similar to moving targets, obtain a jamming method and system for UAV SAR platform with high real-time performance and adjustable interference area and position.

[0005] The technical solution to achieve the purpose of the present invention is: a regional adjustable intermittent sampling interference method for a UAV SAR platform, comprising the following steps:

[0006] Step 1: Generate radar raw data based on the intercepted SAR signal carried by the drone;

[0007] Step 2: Use the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group;

[0008] Step 3: according to the intermittent sampling signal controlled by the Bernoulli mapping sequence generated in step 2, the SAR signal is interfered in the range and azimuth directions by using the method of frequency shift in the range and false motion target characteristic modulation, so as to generate an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has the false motion characteristic;

[0009] Step 4: The interference signal generated in step 3 is processed through digital-to-analog conversion, low-pass filtering and up-conversion, and then sent using a transmitting antenna to complete the interference with the UAV SAR platform radar.

[0010] A regional adjustable intermittent sampling interference system for a UAV SAR platform, the system is used to implement the regional adjustable intermittent sampling interference method for a UAV SAR platform, the system includes a raw data generation module, a non-uniform false target group generation module, an interference signal generation module and an antenna transmission module, wherein:

[0011] The raw data generation module generates radar raw data based on the intercepted SAR signals carried by the UAV;

[0012] The non-uniform false target group generation module uses the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group;

[0013] The interference signal generation module, based on the intermittent sampling signal controlled by the Bernoulli mapping sequence generated by the non-uniform false target group generation module, uses the method of frequency shift in the range direction and modulation of false motion target characteristics to interfere with the range and azimuth directions of the SAR signal, and generates an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has false motion characteristics;

[0014] The antenna transmitting module processes the interference signal generated by the interference signal generating module through digital-to-analog conversion, low-pass filtering and up-conversion, and then sends it using the transmitting antenna to complete the interference on the UAV SAR platform radar.

[0015] A mobile terminal comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for regionally adjustable intermittent sampling interference for a UAV SAR platform is implemented.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the regionally adjustable intermittent sampling interference method for an unmanned aerial vehicle SAR platform.

[0017] Compared with the prior art, the present invention has the following significant advantages: (1) by adjusting the interference receiving window and the interference forwarding window lengths through a Bernoulli mapping sequence, an intermittent sampling signal with random sampling duration and interval is generated, thereby generating a randomly distributed non-uniform multi-false target group, and effectively solving the problem of regular distribution of multiple false targets; (2) by frequency shift modulation and false motion target characteristic modulation of the signal, the interference signal has characteristics similar to those of a moving target, and thus cannot be cancelled by the SAR-GMTI mode; (3) by adjusting relevant parameters to control the position of the regional false target in the range and azimuth directions, a regional false target deception interference for the UAV SAR platform is obtained with high real-time performance and the ability to adjust the interference area and position, thereby achieving protection of real moving targets in a specific area and improving the flexibility of interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a flow chart of the regional adjustable intermittent sampling interference method for the UAV SAR platform of the present invention.

[0019] Figure 2 Schematic diagram of the timing of two-way intermittent sampling and forwarding interference in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can imagine various implementation methods of the present invention. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction of the technical solution of the present invention.

[0021] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0022] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0023] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0024] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Combination Figure 1 The present invention provides a regional adjustable intermittent sampling interference method for an unmanned aerial vehicle SAR platform, comprising the following steps:

[0027] Step 1: Generate radar raw data based on the intercepted SAR signal carried by the drone;

[0028] Step 2: Use the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group;

[0029] Step 3: according to the intermittent sampling signal controlled by the Bernoulli mapping sequence generated in step 2, the SAR signal is interfered in the range and azimuth directions by using the method of frequency shift in the range and false motion target characteristic modulation, so as to generate an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has the false motion characteristic;

[0030] Step 4: The interference signal generated in step 3 is processed through digital-to-analog conversion, low-pass filtering and up-conversion, and then sent using a transmitting antenna to complete the interference with the UAV SAR platform radar.

[0031] As a specific example, in step 1, radar raw data is generated based on the intercepted SAR signal carried by the drone, as follows:

[0032] Step 1.1: The intercepted SAR signal carried by the drone is a linear frequency modulation signal, expressed as:

[0033]

[0034] In the formula, t r is the distance fast time, f c is the signal carrier frequency, T is the linear frequency modulation signal pulse width, B r is the LFM signal bandwidth, μ r =B r / T, rect(·) is the rectangular window function;

[0035] Step 1.2: The echo signal of the SAR platform carried by the UAV is processed by removing the carrier frequency:

[0036]

[0037] In the formula, t a is the azimuthal slow time, c is the speed of light, T P is the SAR signal pulse width, T L is the synthetic aperture time, μ r is the range frequency modulation slope, f cis the signal carrier frequency, v is the speed of the UAV, and the jammer coordinates are (x j ,y j ), R(ta) is any time t a The instantaneous distance from the jammer to the SAR, rect(·) is the rectangular window function.

[0038] As a specific example, the Bernoulli mapping sequence described in step 2 is used to intermittently sample the drone SAR signal to generate a randomly distributed non-uniform false target group, combined with Figure 2 , as follows:

[0039] Step 2.1: The intermittent sampling forwarding interference model is regarded as the superposition of the product of the intercepted signal and multiple square wave response functions p(t) in a single pulse. The square wave response function p(t) is:

[0040]

[0041] In the formula, τ is the sampling time, T s is the repetition period, then T s -τ is the duration of interference; δ(·) is the impulse function; in general,

[0042] Step 2.2: Set the intermittent sampling pulse signal p in the range and azimuth directions r (t r ) and p a (t a ) are:

[0043]

[0044] Where, T wr 、T wa is the sampling pulse width, T sr 、T sa is the sampling period;

[0045] Step 2.3: During the forwarding process, use the Bernoulli mapping sequence to control the intermittent sampling pulse signal p r (t r ) and p a (t a ), the Bernoulli mapping sequence is:

[0046]

[0047] Among them, z k 、z k+1 is the Bernoulli mapping sequence, k is the sequence number, and λ is an adjustable parameter;

[0048] The intermittent sampling pulse signal p in the range and azimuth directions controlled by the Bernoulli mapping sequence isr '(t r ) and p a '(t a ) is:

[0049]

[0050] Where λ 1r , 1a , 2r , 2a is the mapping factor, z kr 、z ka is a Bernoulli mapping sequence;

[0051] Step 2.4: According to the Bernoulli mapping sequence, the SAR signal is periodically sampled in full pulses, and each pulse is sampled and forwarded in the range direction. The range direction intermittent sampling is equivalent to s(t r ,t a ) and p r '(t) is multiplied, then the distance controlled by the Bernoulli mapping sequence forwards the interference signal s to the intermittent sampling Jr (t r ,t a )for:

[0052] s Jr (t r ,t a )=s(t r ,t a ) r '(t r )

[0053] Two-way intermittent sampling forwarding interference signal s controlled by Bernoulli mapping sequence Jk (t r ,t a )for:

[0054]

[0055] Step 2.5: Intermittently sample the pulse signal p in the distance direction controlled by the Bernoulli mapping sequence r '(t r ) and Fourier transform:

[0056]

[0057] In the formula, f r is the fast time frequency, f sr =1 / λ 2r z kr is the distance sampling frequency, is the distance sampling duty cycle;

[0058] The intermittent sampling pulse signal p in the azimuth direction controlled by the Bernoulli mapping sequence a '(t a ) is transformed into:

[0059]

[0060] In the formula, f a represents the azimuth Doppler frequency, is the azimuth sampling duty cycle;

[0061] The distance of the Bernoulli mapping sequence control is forwarded to the intermittent sampling interference signal s Jr (t r ,t a ) is subjected to fast-time Fourier transform, and the fast-time spectrum in the distance direction is obtained as follows:

[0062]

[0063] Step 2.5: In the two-dimensional decoupling process of SAR signals, the phase history of fast time and slow time are independent of each other. Therefore, the two-way intermittent sampling is regarded as the series connection of the distance intermittent sampling and the azimuth intermittent sampling, and can be processed separately. Therefore, the instantaneous distance R(ta) from the jammer to the SAR is processed by Fresnel approximation, and the azimuth information is recorded as s a (t a ),but:

[0064]

[0065] In the formula, μ a =-2v 2 / λR j The frequency is modulated in azimuth;

[0066] Step 2.6: According to s a (t a ),s Jk (t r ,t a ), P r '(f r ), P a '(f a ) and S j (f r ,t a ), the two-dimensional spectrum of the interference signal is obtained as:

[0067]

[0068] In the formula, S'(f r ,f a) is the UAV SAR platform echo signal s(t r ,t a )’s two-dimensional spectrum.

[0069] As a specific example, in step 3, according to the intermittent sampling signal controlled by the Bernoulli mapping sequence generated in step 2, the range and azimuth directions of the SAR signal are interfered by using the method of frequency shift in the range and modulation of the false motion target characteristics, and a smart interference signal controlled by the modulated Bernoulli mapping sequence is generated, so that the interference signal has the false motion characteristics, as follows:

[0070] Step 3.1: Set the frequency shift in the range direction to Δf, then the additional modulation term of the frequency shift is exp(j2πΔft r );

[0071] Step 3.2, false moving target characteristic modulation refers to modulating false moving target information between signal pulses so that the emitted interference signal has characteristics similar to those of a real moving target, thus not being cancelled by the SAR-GMTI system;

[0072] The initial position of the false moving target is the same as that of the jammer, and its range velocity is v y , the phase φ(ta) added by the motion is the modulation term of the false motion target characteristic, as follows:

[0073]

[0074] Set the initial motion time of the drone to be detected as t a = 0, the jammer coordinates are (x j ,y j ), R0(t a ) is the initial slant distance from the moving target to the UAV, Rj(ta) is the slant distance from the moving target to the UAV, R J is the initial slant range from the jammer to the SAR, Then the interference signal s J (t) can be rewritten as:

[0075] s J (t r ,t a )=s(t r ,t a ) r '(t r ) r '(t a )exp(j2πΔft r )exp(jΔφ(t a ))

[0076] Step 3.3: The final result of the interference signal after two-dimensional matched filtering is:

[0077]

[0078] In the formula, is the distance to arrival time, is the azimuth arrival time;

[0079] Step 3.4: The positions and intervals of false targets in range and azimuth are:

[0080]

[0081] Step 3.5: Generate the smart jamming signal controlled by the modulated Bernoulli sequence as:

[0082]

[0083] Among them, s J (t r ,t a ) is the smart interference signal of Bernoulli sequence control, s(t r ,t a ) is the radar signal, exp(j2πΔft r ) is frequency shift modulation, exp(jΔφ(t a )) is motion modulation.

[0084] The present invention also provides a regional adjustable intermittent sampling interference system for a UAV SAR platform, which is used to implement the regional adjustable intermittent sampling interference method for a UAV SAR platform. The system includes a raw data generation module, a non-uniform false target group generation module, an interference signal generation module and an antenna transmission module, wherein:

[0085] The raw data generation module generates radar raw data based on the intercepted SAR signals carried by the UAV;

[0086] The non-uniform false target group generation module uses the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group;

[0087] The interference signal generation module, based on the intermittent sampling signal controlled by the Bernoulli mapping sequence generated by the non-uniform false target group generation module, uses the method of frequency shift in the range direction and modulation of false motion target characteristics to interfere with the range and azimuth directions of the SAR signal, and generates an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has false motion characteristics;

[0088] The antenna transmitting module processes the interference signal generated by the interference signal generating module through digital-to-analog conversion, low-pass filtering and up-conversion, and then sends it using the transmitting antenna to complete the interference on the UAV SAR platform radar.

[0089] The present invention also provides a mobile terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for regionally adjustable intermittent sampling interference for a UAV SAR platform is implemented.

[0090] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the steps in the regional adjustable intermittent sampling interference method for the UAV SAR platform are implemented.

[0091] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A regionally adjustable intermittent sampling interference method for UAV SAR platform, characterized in that: The following steps are involved: Step 1: Generate radar raw data based on the intercepted SAR signal carried by the drone; Step 2: Use the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group; Step 3: according to the intermittent sampling signal controlled by the Bernoulli mapping sequence generated in step 2, the SAR signal is interfered in the range and azimuth directions by using the method of frequency shift in the range and false motion target characteristic modulation, so as to generate an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has the false motion characteristic; Step 4: The interference signal generated in step 3 is processed through digital-to-analog conversion, low-pass filtering and up-conversion, and then sent using a transmitting antenna to complete the interference with the UAV SAR platform radar.

2. The regionally adjustable intermittent sampling interference method for the UAV SAR platform according to claim 1 is characterized in that: In step 1, the radar raw data is generated according to the intercepted SAR signal carried by the drone, as follows: Step 1.1: The intercepted SAR signal carried by the drone is a linear frequency modulation signal, expressed as: Where, t r is the distance fast time, f c is the signal carrier frequency, T is the linear frequency modulation signal pulse width, B r is the LFM signal bandwidth, μ r =B r / T, rect(·) is the rectangular window function; Step 1.2: The echo signal of the SAR platform carried by the UAV is processed by removing the carrier frequency: Where, t a is the azimuthal slow time, c is the speed of light, T P is the SAR signal pulse width, T L is the synthetic aperture time, μ r is the range frequency modulation slope, f c is the signal carrier frequency, v is the speed of the UAV, and the jammer coordinates are (x j ,y j ), R(ta) is any time t a The instantaneous distance from the jammer to the SAR, rect(·) is the rectangular window function.

3. The regionally adjustable intermittent sampling interference method for the UAV SAR platform according to claim 2 is characterized in that: The Bernoulli mapping sequence described in step 2 is used to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group, as follows: Step 2.1: The intermittent sampling forwarding interference model is regarded as the superposition of the product of the intercepted signal and multiple square wave response functions p(t) in a single pulse. The square wave response function p(t) is: In the formula, τ is the sampling time, T s is the repetition period, then T s -τ is the duration of interference; δ(·) is the impulse function; Step 2.2: Set the intermittent sampling pulse signal p in the range and azimuth directions r (t r ) and p a (t a ) are: Where, T wr , T wa is the sampling pulse width, T sr , T sa is the sampling period; Step 2.3: During the forwarding process, use the Bernoulli mapping sequence to control the intermittent sampling pulse signal p r (t r ) and p a (t a ), the Bernoulli mapping sequence is: Among them, z k 、z k+1 is the Bernoulli mapping sequence, k is the sequence number, and λ is an adjustable parameter; The intermittent sampling pulse signal p in the range and azimuth directions controlled by the Bernoulli mapping sequence is r '(t r ) and p a '(t a ) is: Where λ 1r , 1a , 2r , 2a is the mapping factor, z kr 、z ka is a Bernoulli mapping sequence; Step 2.4: According to the Bernoulli mapping sequence, the SAR signal is periodically sampled in full pulses, and each pulse is sampled and forwarded in the range direction. The range direction intermittent sampling is equivalent to s(t r ,t a ) and p r '(t) is multiplied, then the distance controlled by the Bernoulli mapping sequence forwards the interference signal s to the intermittent sampling Jr (t r ,t a )for: s Jr (t r ,t a )=s(t r ,t a )p r '(t r ) Two-way intermittent sampling forwarding interference signal s controlled by Bernoulli mapping sequence Jk (t r ,t a )for: Step 2.5: Intermittently sample the pulse signal p in the distance direction controlled by the Bernoulli mapping sequence r '(t r ) and Fourier transform: In the formula, f r is the fast time frequency, f sr =1 / λ 2r z kr is the distance sampling frequency, is the distance sampling duty cycle; The intermittent sampling pulse signal p in the azimuth direction controlled by the Bernoulli mapping sequence a '(t a ) is transformed into: In the formula, f a represents the azimuth Doppler frequency, is the azimuth sampling duty cycle; The distance of the Bernoulli mapping sequence control is forwarded to the intermittent sampling interference signal s Jr (t r ,t a ) is used for fast-time Fourier transform, and the fast-time spectrum in the distance direction is obtained as follows: Step 2.5: In the two-dimensional decoupling process of SAR signals, the phase history of fast time and slow time are independent of each other. Therefore, the two-way intermittent sampling is regarded as the series connection of the distance intermittent sampling and the azimuth intermittent sampling, and can be processed separately. Therefore, the instantaneous distance R(ta) from the jammer to the SAR is processed by Fresnel approximation, and the azimuth information is recorded as s a (t a ),but: In the formula, μ a =-2v 2 / λR j The frequency is modulated in azimuth; Step 2.6: According to s a (t a ),s Jk (t r ,t a ), P r '(f r ), P a '(f a ) and S j (f r ,t a ), the two-dimensional spectrum of the interference signal is obtained as: In the formula, S'(f r ,f a ) is the UAV SAR platform echo signal s(t r ,t a )’s two-dimensional spectrum.

4. The regionally adjustable intermittent sampling interference method for the UAV SAR platform according to claim 3 is characterized in that: In step 3, the intermittent sampling signal controlled by the Bernoulli mapping sequence generated in step 2 is interfered with the range and azimuth directions of the SAR signal by using the method of frequency shift in the range and modulation of the false motion target characteristics, and an interference signal controlled by the modulated Bernoulli mapping sequence is generated. The interference signal has the false motion characteristics, which is as follows: Step 3.1: Set the frequency shift in the range direction to Δf, then the additional modulation term of the frequency shift is exp(j2πΔft r ); Step 3.2: The initial position of the false moving target is the same as that of the jammer, and the range velocity is v y , the phase φ(t a ) is the false motion target characteristic modulation item, which is as follows: Set the initial motion time of the drone to be detected as t a = 0, the jammer coordinates are (x j ,y j ), R0(t a ) is the initial slant distance from the moving target to the UAV, Rj(ta) is the slant distance from the moving target to the UAV, R J is the initial slant range from the jammer to the SAR, Then the interference signal s J (t) can be rewritten as: s J (t r ,t a )=s(t r ,t a )p r '(t r )p r '(t a )exp(j2πΔft r )exp(jΔφ(t a )) Step 3.3: The final result of the interference signal after two-dimensional matched filtering is: In the formula, is the distance to arrival time, is the azimuth arrival time; Step 3.4: The positions and intervals of false targets in range and azimuth are: Step 3.5: Generate the smart jamming signal controlled by the modulated Bernoulli sequence as: Among them, s J (t r ,t a ) is the smart interference signal of Bernoulli sequence control, s(t r ,t a ) is the radar signal, exp(j2πΔft r ) is frequency shift modulation, exp(jΔφ(t a )) is motion modulation.

5. A regionally adjustable intermittent sampling jamming system for UAV SAR platform, characterized in that: The system is used to implement the regional adjustable intermittent sampling interference method for the UAV SAR platform according to any one of claims 1 to 4, and the system includes a raw data generation module, a non-uniform false target group generation module, an interference signal generation module and an antenna transmission module, wherein: The raw data generation module generates radar raw data based on the intercepted SAR signals carried by the UAV; The non-uniform false target group generation module uses the Bernoulli mapping sequence to intermittently sample the UAV SAR signal to generate a randomly distributed non-uniform false target group; The interference signal generation module, based on the intermittent sampling signal controlled by the Bernoulli mapping sequence generated by the non-uniform false target group generation module, uses the method of frequency shift in the range direction and modulation of false motion target characteristics to interfere with the range and azimuth directions of the SAR signal, and generates an interference signal controlled by the modulated Bernoulli mapping sequence, and the interference signal has false motion characteristics; The antenna transmitting module processes the interference signal generated by the interference signal generating module through digital-to-analog conversion, low-pass filtering and up-conversion, and then sends it using the transmitting antenna to complete the interference on the UAV SAR platform radar.

6. A mobile terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the regionally adjustable intermittent sampling interference method for the UAV SAR platform is implemented as described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by the processor, the steps in the regional adjustable intermittent sampling interference method for the UAV SAR platform as described in any one of claims 1 to 4 are implemented.

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