CN114089291B - Device for jamming synthetic aperture radar - Google Patents
Device for jamming synthetic aperture radarInfo
- Publication number
- CN114089291B CN114089291B CN202210059095.9A CN202210059095A CN114089291B CN 114089291 B CN114089291 B CN 114089291B CN 202210059095 A CN202210059095 A CN 202210059095A CN 114089291 B CN114089291 B CN 114089291B
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- aperture radar
- synthetic aperture
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- interference
- radar signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/38—Jamming means, e.g. producing false echoes
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The application provides a device for synthesizing aperture radar interference. The device for synthesizing the aperture radar interference comprises a receiving module, a processing module and an output module, wherein the receiving module is used for receiving an aperture radar signal, the processing module is used for modulating the aperture radar signal by adopting a radio frequency multi-phase segmentation modulation model to generate an interference signal of the aperture radar signal, and the output module is used for sending the generated interference signal of the aperture radar signal to the aperture radar. In this way, a lower cost of interference with synthetic aperture radar is achieved.
Description
Technical Field
The application relates to the technical field of radar countermeasure, in particular to a device for synthesizing hole radar interference.
Background
In the prior art, the synthetic aperture radar is carried on an aerial and space platform such as a satellite, an airplane, an unmanned aerial vehicle and the like, can work in a plurality of radio frequency bands such as L, X, C, ku, ka, millimeter waves and the like, can perform long-distance high-resolution ground imaging reconnaissance all the day long, and acquire ground target information. The existing interference method for synthesizing the aperture radar is generally implemented by adopting forward interference, wherein a Digital Radio Frequency Memory (DRFM) is a core device of the forward interference.
In implementing the prior art, the inventors found that:
with the continuous improvement of the performance of the synthetic aperture radar system, the corresponding signal bandwidth is continuously increased, so that the digital processing capacity of the digital radio frequency memory DRFM needs to be enhanced to realize the interference on the synthetic aperture radar signal. In the process of adopting the digital radio frequency memory DRFM and other frequency conversion components connected with the DRFM to interfere the signal function of the synthetic aperture radar, the implementation cost is high.
Therefore, a low-cost technical scheme for synthesizing aperture radar interference is needed.
Disclosure of Invention
The embodiment of the application provides a technical scheme of synthetic aperture radar interference with lower cost, which is used for solving the technical problem of higher implementation cost of the synthetic aperture radar interference in the prior art.
Specifically, a device for synthesizing aperture radar interference comprises:
the receiving module is used for receiving the synthetic aperture radar signal;
The processing module is used for modulating the synthetic aperture radar signal by adopting a radio frequency multi-phase segmentation modulation model to generate an interference signal of the synthetic aperture radar signal;
and the output module is used for sending the interference signal of the generated synthetic aperture radar signal to the synthetic aperture radar.
Furthermore, the device for interfering the synthetic aperture radar is further provided with a preprocessing module, which is used for preprocessing the synthetic aperture radar signal and determining a signal segmentation length value and a signal phase adjustment value of the interfering synthetic aperture radar signal.
Furthermore, the radio frequency multi-phase segmented modulation model at least adopts radio frequency phase modulation equipment to carry out multi-phase segmented modulation on the synthetic aperture radar signal.
Furthermore, the device for synthesizing the aperture radar interference is also provided with a branching device for branching the aperture radar signal.
Furthermore, a filter bank is further arranged in the device for synthesizing aperture radar interference and is used for filtering the synthetic aperture radar signals.
Further, the filter set filters the synthetic aperture radar signal corresponding to a center frequency and a bandwidth of the radio frequency phase modulation device.
Furthermore, the receiving module is also provided with a low noise signal amplifying module for amplifying the received signal.
Furthermore, a detection unit is further arranged in the receiving module and is used for detecting whether the signal is a synthetic aperture radar signal.
The technical scheme provided by the embodiment of the application has at least the following beneficial effects:
the device for synthesizing the aperture radar interference can replace the interference of the synthesized aperture radar signal realized by the digital radio frequency memory DRFM, up-down frequency conversion and other microwave radio frequency components, can simplify the system design under the condition that the core performance is not reduced, reduces the cost, and simultaneously brings the advantages of being capable of processing and interfering with larger bandwidth SAR.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic structural diagram of a device for synthesizing aperture radar interference according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an apparatus for synthesizing aperture radar interference according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a device for interfering synthetic aperture radar based on the principle that the synthetic aperture radar obtains ground target information through two dimensions of distance and azimuth of radar echo signals of a ground target. At present, the synthetic aperture radar signal interference is mainly realized through digital radio frequency memory DRFM, up-down frequency conversion and other microwave radio frequency components. However, as the resolution index of the synthetic aperture radar system is continuously improved, the signal bandwidth required for implementing the signal interference of the synthetic aperture radar by adopting the digital radio frequency memory DRFM, up-down conversion and other microwave radio frequency components must be improved, thereby leading to corresponding increase of equipment cost. How to realize a device for synthesizing aperture radar interference with low cost is a technical problem which is solved by the technical scheme of the application.
Synthetic Aperture Radar (SAR) is a high resolution imaging radar that can obtain high resolution radar images resembling electrophotography under meteorological conditions of extremely low visibility. The radar with a larger equivalent antenna aperture is synthesized by a data processing method by utilizing the relative motion of the radar and the target, and the radar is also called as a synthetic aperture radar. The synthetic aperture radar has the characteristics of high resolution, all-weather operation and effective recognition of camouflage and penetration of a mask. The resulting high azimuth resolution is equivalent to that provided by a large aperture antenna.
Radio Frequency (RF) is an abbreviation for Radio Frequency, which means electromagnetic Frequency that can radiate into space, ranging from 300KHz to 30 GHz. RF is radio frequency current, which is a short term for high frequency alternating electromagnetic wave. Alternating current that varies less than 1000 times per second is referred to as low frequency current, and alternating current that varies more than 10000 times is referred to as high frequency current, and radio frequency is such a high frequency current.
The multiphase segmented modulation is two-dimensional processing of imaging of synthetic aperture radar, and the received signal is a pulse signal. When a pulse signal is received, the signal is segmented in time and phase modulated to generate an interference signal. The generated interference signals can generate image coverage blocks with controllable quantity, position, area and brightness and peripheral background images in the synthetic aperture radar image after being modulated. It should also be noted that by setting the modulation parameter values in the multi-phase segmented modulation, the number, position, area, image coverage blocks and surrounding background images generated in the different synthetic aperture radar images can be obtained. It can be understood that the radio frequency multi-phase segmented modulation model is based on multi-phase segmented modulation and adopts radio frequency technology to realize the modulation of the image formed by the synthetic aperture radar signal.
Referring to fig. 1, the present application provides a device for synthesizing aperture radar interference, comprising:
A receiving module 11 for receiving a synthetic aperture radar signal;
The processing module 12 is configured to modulate the synthetic aperture radar signal with a radio frequency multi-phase segmented modulation model, and generate an interference signal of the synthetic aperture radar signal;
and the output module 13 is used for sending the interference signal of the generated synthetic aperture radar signal to the synthetic aperture radar.
The receiving module 11 receives a radiation source signal in a wide frequency range through a wide band antenna. It will be appreciated that the broadband antenna may receive radiation source signals within a broad frequency range in addition to the synthetic aperture radar signals. Radiation source signals in a wide frequency range are radiation source signals having a specific bandwidth greater than twice the frequency range. The specific bandwidth is the ratio of the highest frequency to the lowest frequency within the bandwidth.
In a preferred embodiment of the present application, the receiving module 11 may further be provided with a detection signal unit for detecting the synthetic aperture radar signal from the radiation source signal within a wide frequency range received by the broadband antenna. Of course, a signal amplifying unit may also be provided in the receiving module in order to facilitate detection and identification of the radiation source signal. It can be understood that by arranging the signal amplifying unit and the signal detecting unit, the receiving module can more accurately receive the synthetic aperture radar signal.
The processing module 12 is mainly used for processing the synthetic aperture radar signal received by the receiving module 11 by using a radio frequency multi-phase segmentation modulation model. The processing module 12 does not need to perform up-conversion processing and down-conversion processing on the composite aperture radar signal in the processing process of performing the radio frequency multi-phase segmented modulation model, and is realized only through intermediate frequency processing. It can be understood that the processing module 12 is implemented only by intermediate frequency processing, and the device for synthesizing the aperture radar interference provided by the application needs to be provided with equipment for ensuring that the bandwidth and the frequency correspond to each other when the processing module 12 processes. In a preferred embodiment of the present application, a device corresponding to the rf multi-phase segmented modulation model in the processing module 12 may be disposed before or after the processing module of the apparatus for synthesizing aperture radar interference, so that the processing module 12 processes the synthetic aperture radar signal to generate an interference signal of the synthetic aperture radar signal.
The output module 13 transmits the generated interference signal of the synthetic aperture radar signal to the synthetic aperture radar through the broadband transmitting antenna. In a preferred embodiment of the present application, a signal amplifying unit may also be disposed in the output module 13, and the quality of the interference signal of the output synthetic aperture radar signal is ensured by the signal amplifying unit.
Further, in a preferred embodiment of the present application, the device for synthesizing aperture radar interference is further provided with a preprocessing module, configured to preprocess the synthetic aperture radar signal, and determine an interference parameter that interferes with the synthetic aperture radar signal.
Specifically, the device for synthesizing aperture radar interference is also provided with a preprocessing module, wherein the preprocessing module is mainly used for analyzing and processing radiation source information and parameters of the aperture radar signals and determining parameter values of the modulated aperture radar signals through analyzing and processing the radiation source information and parameters of the aperture radar signals. The parameter value of the modulated SAR signal is the interference parameter of the interference SAR signal.
It can be understood that the parameter values of the modulated synthetic aperture radar signal determined by the preprocessing module are mainly used for setting parameters of the radio frequency multi-phase segmented modulation model in the processing module. In a preferred embodiment of the present application, the parameter values of the modulated synthetic aperture radar signal determined by the preprocessing module are directly used for setting parameters of the rf multi-phase segmented modulation model of the processing module. Of course, the parameter value of the modulated synthetic aperture radar signal determined by the preprocessing module can also be used as a set reference value of the parameter of the processing module radio frequency multiphase segmented modulation model. It should be noted that the specific relation between the parameter value of the modulated synthetic aperture radar signal determined by the preprocessing module, i.e. the interference parameter of the interfering synthetic aperture radar signal, and the set value of the processing module radio frequency multi-phase segmented modulation model parameter obviously does not constitute a limitation on the specific protection scope of the present application.
It should be noted that the preprocessing module obtains the basic parameters of the synthetic aperture radar signal by analyzing the synthetic aperture radar signal. And determining the interference parameters which interfere with the synthetic aperture radar signal according to the obtained basic parameters of the synthetic aperture radar signal. It should be noted that the rf multi-phase segmented modulation model in the processing module may implement modulation of the synthetic aperture radar signal, but the number of tiles generated by the processing module for interfering signals of the synthetic aperture radar signal generated by processing the synthetic aperture radar signal, the tile brightness of the tile position and the tile size, etc. are determined by setting the modulation parameter values of the rf multi-phase segmented modulation model, and the setting of the modulation parameter values of the processing module may use or refer to determining the parameter values of the modulated synthetic aperture radar signal by the preprocessing module to determine the number of tiles generated by interfering signals of the synthetic aperture radar signal, the tile brightness of the tile position and the tile size. For example, after the preprocessing module analyzes and processes the synthetic aperture radar signal, determining a segment length value of the modulated synthetic aperture radar signal, and then the processing module generates a synthetic aperture radar image block size determined by the signal segment length value after performing a radio frequency multi-phase segment modulation model by using the segment length value of the modulated synthetic aperture radar signal determined in the preprocessing module.
It will be appreciated that the preprocessing module 12 performs preprocessing on the sar signal, and may also control the number of signal processing channels and the signal delay in addition to determining the signal segment length value and the signal phase adjustment value of the interfering sar signal. It will be appreciated that the modulation parameter values generated by the preprocessing module affect the number of image blocks, the size of the image blocks, the position of the image blocks and the brightness of the image blocks formed in the synthetic aperture radar by the interference signals of the synthetic aperture radar signals processed by the processing module 12, and are controlled by the modulation parameters of the preprocessing module.
Further, in a preferred embodiment of the present application, the rf multi-phase segmented modulation model performs multi-phase segmented modulation on the synthetic aperture radar signal at least using an rf phase modulation device.
Specifically, the radio frequency multiphase segmented modulation model realizes modulation of the synthetic aperture radar signal through radio frequency phase modulation equipment. The radio frequency phase modulation device can be a numerical control phase shifter or other devices capable of realizing the radio frequency phase modulation function. In a preferred embodiment of the present application, the rf phase modulation device preferably employs a digitally controlled phase shifter. And the number of the numerical control phase shifters adopted by the radio frequency phase modulation equipment is at least two or more.
It should be noted that implementing the rf multi-phase segment modulation by the rf phase modulation device should take into account the center frequency and bandwidth issues of the rf phase modulation device, i.e. the instantaneous operating bandwidth of the rf phase modulation device cannot cover a large operating frequency range. Therefore, the rf phase modulation device needs to be set to a frequency and bandwidth range that the rf phase modulation device can receive before modulating the synthetic aperture radar signal. It will be appreciated that a device capable of enabling the radio frequency phase modulation module to process the synthetic aperture radar signal may be provided in or before the processing module, for example, a filter may be provided in or before the processing module to achieve a normal operating state of the radio frequency phase modulation device.
Furthermore, in an preferred embodiment of the present application, a splitter is further provided in the device for synthesizing the radar interference, and the splitter is configured to split the synthetic radar signal. The splitter is used for splitting the received synthetic aperture radar signal.
In particular, the splitter may be provided in the process module or before the process module. After the synthetic aperture radar signal is shunted, the modulation of the radio frequency multi-phase modulation model is carried out. It is further understood that a combiner may be further disposed in the device for synthesizing aperture radar interference, and the combiner may be disposed in the processing module or disposed after the processing module. The setting of the combiner is mainly used for synthesizing an interference signal of the synthetic aperture radar signal generated after the modulation of the radio frequency multiphase segmented modulation model is carried out on the synthetic aperture radar signal.
It should be noted that the setting of the splitter and the combiner is set in consideration of the fact that the instantaneous operating bandwidth of the radio frequency phase modulation device in the radio frequency multi-phase segmented modulation model cannot cover a large operating frequency.
Furthermore, in a preferred embodiment of the present application, a filter bank is further provided in the device for synthesizing aperture radar interference, for filtering the synthetic aperture radar signal.
Specifically, the filter bank is composed of at least two filters. The synthetic aperture radar signal can be divided into a plurality of channels by the arrangement of the filter bank. The center frequencies and bandwidths corresponding to the plurality of channels correspond to the center frequencies and bandwidths of the radio frequency phase modulation device. The center frequency refers to the frequency of the filter passband, which generally refers to the bandwidth of the frequency band occupied by the signal.
It should be noted that the filter bank may equally be arranged in the processing module, either before or after the processing module, for filtering the synthetic aperture radar signal before or after the processing. The synthetic aperture radar signal is filtered and modulated by a radio frequency phase modulation device corresponding to its center frequency and bandwidth. In a preferred embodiment of the application, filter banks are arranged before and after the processing module, respectively, for filtering the raw synthetic aperture radar signal and the interference signal of the synthetic aperture radar signal processed by the processing module, respectively. So as to meet the processing conditions of the processing module and generate an interference signal meeting the requirements of the filter on the synthetic aperture radar signal after the processing module processes the interference signal.
It is also understood that the device for synthesizing the aperture radar interference can be provided with a splitter and a combiner, and a filter can be also arranged. In a preferred embodiment provided by the application, the receiving module sends the received synthetic aperture radar signal to the branching unit for branching, and then the branching unit divides the received synthetic aperture radar signal into a plurality of channels through the filter group, the center frequency and the bandwidth of each channel correspond to the center frequency and the bandwidth of the radio frequency phase modulation device, and after the processing module processes the signals, the signals are filtered again and then combined, and then the interference signals of the synthetic aperture radar signal are generated.
Further, in a preferred embodiment provided by the present application, the center frequency and bandwidth of the rf phase modulation device are the same as the center frequency and bandwidth of the synthetic aperture radar signal.
Specifically, the radio frequency phase modulation device mainly modulates the synthetic aperture radar signal through a numerical control radio frequency phase shifter. It should be noted that, since the instantaneous operating bandwidth of the digitally controlled rf phase shifter cannot cover a large operating frequency range, modulation of the synthetic aperture radar signal can be achieved by providing splitters, filters, etc. It should also be noted that the center frequency and bandwidth of the channel of the synthetic aperture radar signal realized by providing the splitter, the filter is the same as the center frequency and bandwidth of the digitally controlled radio frequency phase shifter device. And further, the modulation of the synthetic aperture radar signal by the radio frequency phase modulation device is realized.
Further, in a preferred embodiment of the present application, the receiving module is further provided with a low noise signal amplifying module for amplifying the received signal.
Specifically, a low noise signal amplifying module is arranged in the receiving module and is mainly used for amplifying the received radiation source signal so as to meet the subsequent interference of the synthetic aperture radar signal.
Further, in a preferred embodiment of the present application, a detecting unit is further provided in the receiving module, for detecting whether the signal is a synthetic aperture radar signal.
Specifically, the detection unit detects the signal received by the receiving module to determine whether the signal is a synthetic aperture radar signal. In a preferred embodiment of the present application, the detection unit may be a reconnaissance receiver, and the detection unit determines whether the signal received in the receiving module is a synthetic aperture radar signal.
As shown in fig. 2, the application provides a device for synthesizing hole radar interference. The receiving module 11 in the device for synthesizing the aperture radar interference corresponds to the equipment for synthesizing the aperture radar interference and comprises a broadband receiving antenna and a low-power amplifier LNA. The processing module 12 in the device for synthesizing the aperture radar interference corresponds to equipment for synthesizing the aperture radar interference and comprises a branching unit, a first filter bank, radio frequency phase modulation equipment, a second filter bank and a combiner. The output module 13 in the device for synthesizing the aperture radar interference corresponds to equipment for synthesizing the aperture radar interference and comprises a power amplifier and a broadband transmitting antenna. The controller of the equipment for interfering the synthetic aperture radar corresponds to a preprocessing module of the device for interfering the synthetic aperture radar.
Specifically, the broadband receiving antenna receives the synthetic aperture radar signal, and the synthetic aperture radar signal is amplified by the low-power amplifier LNA and then is transmitted to two channels respectively, wherein one channel enters the radio frequency phase modulation device through the splitter and the first filter, and the other channel enters the controller. The controller obtains characteristic information of the synthetic aperture radar signal and determines a parameter value of the modulated synthetic aperture radar signal. The radio frequency phase modulation device modulates the synthetic aperture radar signal according to the parameter value of the modulated synthetic aperture radar signal determined by the controller. Before the modulation process is carried out on the synthetic aperture radar signal, the radio frequency phase modulation equipment also needs to be processed by the branching unit and the first filter, so that the center frequency and the bandwidth of the synthetic aperture radar signal are consistent with the center frequency and the bandwidth of the radio frequency phase modulation equipment, and the modulation of the synthetic aperture radar signal is further realized. After modulating the synthetic aperture radar signal, the radio frequency phase modulation device also needs to process the synthetic aperture radar signal through a second filter bank and a combiner to generate an interference signal of the synthetic aperture radar signal processed by the radio frequency phase modulation device. Finally, the power amplifier amplifies the interference signal of the synthetic aperture radar signal and transmits the interference signal through the broadband transmitting antenna.
The controller sends modulation values such as amplitude, frequency, phase and the like of the interference synthetic aperture radar signal to the radio frequency phase modulation equipment, and the radio frequency phase modulation equipment adopts or refers to the modulation values sent by the controller to realize different interference effects. The interference effect of the synthetic aperture radar signal is mainly reflected in the control of the interference image block, the position, the size and the like. For example, the interference image block size is controlled by the segment length of the synthetic aperture radar signal.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement "comprises an" or "comprising" does not exclude that an additional identical element is present in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (2)
1. The device for synthesizing aperture radar interference is characterized by comprising a receiving module, a receiving module and a receiving module, wherein the receiving module is used for receiving a synthetic aperture radar signal;
The processing module is used for modulating the synthetic aperture radar signal by adopting a radio frequency multi-phase segmentation modulation model to generate an interference signal of the synthetic aperture radar signal;
the output module is used for sending the interference signal of the generated synthetic aperture radar signal to the synthetic aperture radar;
the branching unit is used for branching the synthetic aperture radar signal;
the combiner is used for combining the interference signals;
The filter bank is used for filtering the synthetic aperture radar signals;
the radio frequency multi-phase segmented modulation model at least adopts radio frequency phase modulation equipment to carry out multi-phase segmented modulation on the synthetic aperture radar signal;
The radio frequency phase modulation equipment adopts a numerical control phase shifter;
The filter set filters the synthetic aperture radar signal corresponding to the center frequency and bandwidth of the radio frequency phase modulation device, and is composed of at least two filters;
The receiving module sends the received synthetic aperture radar signal to the branching device for branching, and then the synthetic aperture radar signal is divided into a plurality of channels through the first filter bank, the center frequency and the bandwidth of each channel correspond to the center frequency and the bandwidth of the radio frequency phase modulation equipment, after being processed by the radio frequency phase modulation equipment, the synthetic aperture radar signal is filtered through the second filter bank again, and then the synthetic aperture radar signal is combined, so that an interference signal of the synthetic aperture radar signal is generated;
The device for synthesizing the aperture radar interference is also provided with a preprocessing module, which is used for preprocessing the aperture radar signal and determining the interference parameters of the interference aperture radar signal;
and the receiving module is also provided with a detecting unit for detecting whether the signal is a synthetic aperture radar signal.
2. The apparatus for synthesizing aperture radar interference according to claim 1, wherein said receiving module is further provided with a low noise signal amplifying module for amplifying the received signal.
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| CN111983570B (en) * | 2020-07-16 | 2023-02-03 | 北京宏锐星通科技有限公司 | Interference method for SAR-GMTI mode |
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| CN113938148B (en) * | 2021-11-24 | 2024-12-27 | 广东圣大电子有限公司 | A radio frequency cancellation circuit and an anti-interference receiver |
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| CN106646398A (en) * | 2016-09-30 | 2017-05-10 | 中国人民解放军装备学院 | Active camouflage protection method and device based on multiple phase sectionalized modulation radar interference |
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