CN114089291A - Device for interfering synthetic aperture radar - Google Patents
Device for interfering synthetic aperture radar Download PDFInfo
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- CN114089291A CN114089291A CN202210059095.9A CN202210059095A CN114089291A CN 114089291 A CN114089291 A CN 114089291A CN 202210059095 A CN202210059095 A CN 202210059095A CN 114089291 A CN114089291 A CN 114089291A
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- synthetic aperture
- aperture radar
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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
Abstract
The application provides a device that interferes with synthetic aperture radar. Wherein the means for interfering with the synthetic aperture radar comprises: the receiving module is used for receiving synthetic aperture radar signals; the processing module is used for modulating the synthetic aperture radar signal by adopting a radio frequency multiphase segmented modulation model to generate an interference signal of the synthetic aperture radar signal; and the output module is used for sending the generated interference signal of the synthetic aperture radar signal to the synthetic aperture radar. Thus, interference to the synthetic aperture radar is achieved at a lower cost.
Description
Technical Field
The application relates to the technical field of radar countermeasure, in particular to a device for radar interference of synthetic aperture.
Background
In the prior art, the synthetic aperture radar is carried on an air 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 imaging reconnaissance on the ground all day long and all day long, and can acquire ground target information. The existing interference method for the synthetic aperture radar is generally implemented by using a forward interference method, wherein a Digital Radio Frequency Memory (DRFM) is a core device of the forward interference method.
In the process of realizing the prior art, the inventor finds 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 capability of the digital radio frequency memory DRFM needs to be enhanced to realize the interference to the synthetic aperture radar signal. And in the process of adopting the digital radio frequency memory DRFM and other frequency conversion components connected with the digital radio frequency memory DRFM to interfere the signal function of the synthetic aperture radar, the implementation cost is higher.
Therefore, it is desirable to provide a low-cost solution for interference to synthetic aperture radar.
Disclosure of Invention
The embodiment of the application provides a technical scheme for realizing synthetic aperture radar interference with low cost, and the technical scheme is used for solving the technical problem of realizing high cost for synthetic aperture radar interference in the prior art.
Specifically, a device for interfering with synthetic aperture radar comprises:
the receiving module is used for receiving synthetic aperture radar signals;
the processing module is used for modulating the synthetic aperture radar signal by adopting a radio frequency multiphase segmented modulation model to generate an interference signal of the synthetic aperture radar signal;
and the output module is used for sending the generated interference signal of the 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 for preprocessing the synthetic aperture radar signal and determining a signal segment length value and a signal phase adjustment value of the interfering synthetic aperture radar signal.
Further, the radio frequency multi-phase segmented modulation model at least adopts radio frequency phase modulation equipment to perform multi-phase segmented modulation on the synthetic aperture radar signal.
Furthermore, a splitter is further arranged in the device for interfering the synthetic aperture radar and used for splitting the synthetic aperture radar signal.
Furthermore, a filter bank is further arranged in the device for interfering the synthetic aperture radar and is used for filtering the synthetic aperture radar signal.
Further, the filter bank filters the synthetic aperture radar signal corresponding to the center frequency and bandwidth of the radio frequency phase modulation device.
Further, the receiving module is also provided with a low-noise signal amplifying module for amplifying the received signal.
Further, a detection unit is further arranged in the receiving module and used for detecting whether the signal is a synthetic aperture radar signal.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the device for interfering the synthetic aperture radar can replace the interference to the synthetic aperture radar signal realized by microwave radio frequency components such as a digital radio frequency memory DRFM and an up-down frequency conversion, can simplify the system design under the condition that the core performance is not reduced, reduces the cost, and simultaneously brings the advantages of capability of processing and interfering a 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 application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an apparatus for radar jamming of synthetic aperture according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of an apparatus for radar interference on synthetic aperture according to an embodiment of the present disclosure.
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 described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a device for interfering synthetic aperture radar based on the principle that synthetic aperture radar obtains ground target information through two dimensions of distance and direction of radar echo signals of ground targets. At present, the interference to synthetic aperture radar signals is mainly realized by microwave radio frequency components such as a digital radio frequency memory DRFM, an up-down frequency conversion and the like. However, as the resolution index of the synthetic aperture radar system is continuously improved, the signal bandwidth required for realizing the signal interference of the synthetic aperture radar by adopting microwave radio frequency components such as a digital radio frequency memory DRFM, an up-down frequency conversion and the like must be improved, and further the equipment cost is correspondingly increased. How to realize the device that low-cost to aperture radar disturbed is the technical problem that this application's technical scheme aims at solving.
Synthetic Aperture Radar (SAR) is a high resolution imaging radar that can obtain high resolution radar images like a photo-optic under meteorological conditions with extremely low visibility. The relative motion between the radar and the target is used to synthesize a radar with a larger equivalent antenna aperture by a data processing method, which is also called a synthetic aperture radar. The synthetic aperture radar has the characteristics of high resolution, all-weather operation and effective identification of camouflage and penetration masks. The resulting high azimuthal resolution is comparable to that provided by a large aperture antenna.
Radio Frequency (RF) is an abbreviation for Radio Frequency, which represents an electromagnetic Frequency that can radiate into space, ranging from 300KHz to 30 GHz. The short term Radio Frequency (RF) is radio frequency current, which is a short term for high frequency Alternating Current (AC) variable electromagnetic wave. Alternating current that changes less than 1000 times per second is called low frequency current, and alternating current that changes more than 10000 times per second is called high frequency current, and radio frequency is such a high frequency current.
The multiphase segmented modulation is two-dimensional processing carried out on imaging of the synthetic aperture radar, and received signals are pulse signals. When receiving the pulse signal, segmenting the signal according to time and carrying out phase modulation to generate an interference signal. The generated interference signal can generate image covering blocks with controllable quantity, position, area and brightness and surrounding 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 block and surrounding background image generated in different synthetic aperture radar images can be obtained. It can be understood that the radio frequency multi-phase segmented modulation model is modulation of an image formed by synthetic aperture radar signals based on multi-phase segmented modulation and realized by adopting a radio frequency technology.
Referring to fig. 1, the present application provides an apparatus for radar interference on synthetic aperture, including:
a receiving module 11, configured to receive a synthetic aperture radar signal;
the processing module 12 is configured to modulate the synthetic aperture radar signal by using a radio frequency multiphase segmented modulation model, and generate an interference signal of the synthetic aperture radar signal;
and an output module 13, configured to send an interference signal of the generated synthetic aperture radar signal to the synthetic aperture radar.
The receiving module 11 receives radiation source signals in a wide frequency range through a broadband antenna. It will be appreciated that the wide frequency range of radiation source signals received by the wideband antenna may receive other radiation source signals in the wide frequency range in addition to the synthetic aperture radar signals. A radiation source signal in a wide frequency range, i.e. a radiation source signal with a specific bandwidth larger than twice the frequency range. Specific bandwidth is the ratio of the highest frequency to the lowest frequency within the bandwidth.
In a preferred embodiment provided by the present application, a detection signal unit may be further disposed in the receiving module 11, and is configured to detect a synthetic aperture radar signal in a radiation source signal received by the broadband antenna in a wide frequency range. Of course, in order to facilitate detection and identification of the radiation source signal in the receiving module, a signal amplifying unit can be further arranged. It can be understood that the synthetic aperture radar signal can be more accurately received by the receiving module by arranging the signal amplifying unit and the signal detecting unit.
The processing module 12 is mainly configured to perform processing on the synthetic aperture radar signal received by the receiving module 11 by using a radio frequency multi-phase segmented modulation model. The processing module 12 does not need to perform up-conversion processing and down-conversion processing on the synthetic aperture radar signal in the process of performing the radio frequency multi-phase segmented modulation model on the synthetic aperture radar signal, and only needs to perform intermediate frequency processing. It can be understood that the processing module 12 only needs to be implemented by intermediate frequency processing, and that the apparatus for radar jamming on synthetic aperture provided in this application needs to be provided with a device that ensures that the bandwidth and frequency correspond to each other when the processing module 12 processes the radar jamming. In a preferred embodiment provided by the present application, a device corresponding to the radio frequency multi-phase segmented modulation model in the processing module 12 may be disposed before or after the processing module of the apparatus for interfering with the synthetic aperture radar, so that the processing module 12 processes the synthetic aperture radar signal and further generates 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 provided by the present application, a signal amplification unit may also be disposed in the output module 13, and the signal amplification unit ensures the quality of the interference signal of the output synthetic aperture radar signal.
Further, in a preferred embodiment provided by the present application, the apparatus for interfering with a synthetic aperture radar is further provided with a preprocessing module, configured to preprocess the synthetic aperture radar signal and determine an interference parameter interfering with the synthetic aperture radar signal.
Specifically, a preprocessing module is further arranged in the device for interfering the synthetic aperture radar, and the preprocessing module is mainly used for analyzing and processing the radiation source information and parameters of the synthetic aperture radar signal and determining the parameter value of the modulated synthetic aperture radar signal by analyzing and processing the radiation source information and parameters of the synthetic aperture radar signal. The parameter values of the modulated synthetic aperture radar signal are interference parameters interfering with the synthetic aperture radar signal.
It can be understood that the parameter values of the modulated synthetic aperture radar signal determined by the preprocessing module are mainly used in the setting of the radio frequency multi-phase segmented modulation model parameters in the processing module. In a preferred embodiment provided by the present application, the parameter values of the modulated synthetic aperture radar signal determined by the preprocessing module are directly used for setting the radio frequency multiphase segmented modulation model parameters of the processing module. Of course, the parameter value of the modulated synthetic aperture radar signal determined by the preprocessing module may also be used as a reference value for setting the radio frequency multiphase segmented modulation model parameter of the processing module. It should be noted that the specific relationship between the parameter values of the modulated synthetic aperture radar signal determined by the preprocessing module, i.e. the interference parameters of the interfering synthetic aperture radar signal, and the setting values of the radio frequency multiphase segmented modulation model parameters of the processing module obviously does not constitute a limitation to 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 interference parameters interfering the synthetic aperture radar signal corresponding to the obtained basic parameters of the synthetic aperture radar signal. It should be noted that the radio frequency multi-phase segmented modulation model in the processing module may implement modulation on the synthetic aperture radar signal, but the number of image blocks generated by an interference signal of the synthetic aperture radar signal generated by processing the synthetic aperture radar signal, the image block size and image block brightness of the image block position, and the like, which need to be set by the processing module, may be determined by setting modulation parameter values of the radio frequency multi-phase segmented modulation model, and the setting of the modulation parameter values of the processing module may be determined by using or referring to the parameter values determined by modulating the synthetic aperture radar signal by the preprocessing module to determine the image block number generated by the interference signal of the synthetic aperture radar signal, the image block size and image block brightness of the image block position and image block. For example, the preprocessing module determines a segment length value of the modulated synthetic aperture radar signal after analyzing and processing the synthetic aperture radar signal, and 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 using the segment length value of the modulated synthetic aperture radar signal determined in the preprocessing module.
It can be understood that the preprocessing module 12 may perform preprocessing on the synthetic aperture radar signal, and may also control the number of signal processing channels and the signal delay amount, in addition to determining the length value of the signal segment and the signal phase adjustment value of the interfering synthetic aperture radar signal. It can be understood that the modulation parameter value generated by the preprocessing module affects the number of image blocks, the size of the image block, the position of the image block, and the brightness of the image block formed in the synthetic aperture radar by the interference signal of the synthetic aperture radar signal processed by the processing module 12, and is controlled by the modulation parameter of the preprocessing module.
Further, in a preferred embodiment provided by the present application, the radio frequency multi-phase segmented modulation model at least uses a radio frequency phase modulation device to perform multi-phase segmented modulation on the synthetic aperture radar signal.
Specifically, the radio frequency multi-phase segmented modulation model realizes modulation of synthetic aperture radar signals through radio frequency phase modulation equipment. The radio frequency phase modulation equipment can be a numerical control phase shifter or other equipment capable of realizing the radio frequency phase modulation function. In a preferred embodiment provided by the present application, the radio frequency phase modulation device preferably employs a digitally controlled phase shifter. And the radio frequency phase modulation equipment adopts at least two or more numerical control phase shifters.
It should be noted that the implementation of the radio frequency multi-phase segment modulation by the radio frequency phase modulation device should take into account the center frequency and bandwidth issues of the radio frequency phase modulation device, i.e. the instantaneous operating bandwidth of the radio frequency phase modulation device cannot cover a large operating frequency range. Therefore, the radio frequency phase modulation device needs to be set to a frequency and bandwidth range that the radio frequency phase modulation device can receive before modulating the synthetic aperture radar signal. It will be appreciated that the device 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 normal operation of the radio frequency phase modulation device.
Further, in a preferred embodiment provided in the present application, a splitter is further provided in the apparatus for interfering with the synthetic aperture radar, and is used for splitting the synthetic aperture radar signal. The splitter is used for splitting the received synthetic aperture radar signal.
In particular, the splitter may be provided in or before the processing module. And after the synthetic aperture radar signal is shunted, modulating a radio frequency multiphase modulation model. It is also understood that a combiner may also be provided in the apparatus for aperture radar interference, and the combiner may be provided in or after the processing module. The combiner is mainly used for synthesizing an interference signal of the synthetic aperture radar signal generated after the synthetic aperture radar signal is modulated by the radio frequency multiphase segmented modulation model.
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 multiphase segmented modulation model cannot cover a large operating frequency.
Further, in a preferred embodiment provided in the present application, a filter bank is further provided in the apparatus for interfering with a synthetic aperture radar, and is configured to filter 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 frequency and bandwidth corresponding to the plurality of channels correspond to the center frequency and bandwidth of the radio frequency phase modulation device. The center frequency is the frequency of the filter passband, and the bandwidth generally refers to the bandwidth of the frequency band occupied by the signal.
It should be noted that the filter bank may also be arranged in the processing module, or before or after the processing module, for filtering the synthetic aperture radar signal before or after processing. After being filtered, the synthetic aperture radar signal is modulated by radio frequency phase modulation equipment corresponding to the center frequency and the bandwidth of the synthetic aperture radar signal. In a preferred embodiment provided by the present application, filter banks are respectively arranged before and after the processing module, and respectively filter the interference signals of the unprocessed synthetic aperture radar signal and the synthetic aperture radar signal processed by the processing module. So as to satisfy the processing conditions of the processing module and generate an interference signal satisfying the synthetic aperture radar signal required by the filter after the processing of the processing module.
It is also understood that the device for interfering with the aperture radar may be provided with a splitter, a combiner, and a filter. In a preferred embodiment provided by the present application, the receiving module sends the received synthetic aperture radar signal to the splitter for splitting, and then the signal is split into a plurality of channels by the filter bank, and 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 being processed by the processing module, the signal is filtered again, and then combined, and then an interference signal of the synthetic aperture radar signal is generated.
Further, in a preferred embodiment provided by the present application, the center frequency and bandwidth of the radio frequency phase modulation device are the same as the center frequency and bandwidth of the synthetic aperture radar signal.
Specifically, the radio frequency phase modulation equipment mainly realizes the modulation of synthetic aperture radar signals through a numerical control radio frequency phase shifter. It should be noted that, because the instantaneous operating bandwidth of the digital control radio frequency phase shifter cannot cover a large operating frequency range, the modulation of the synthetic aperture radar signal can be realized by setting a splitter, a filter and the like. It should also be noted that the center frequency and bandwidth of the channel of the synthetic aperture radar signal realized by arranging the splitter and the filter are the same as the center frequency and bandwidth of the digitally controlled radio frequency phase shifter device. And further realize the modulation of synthetic aperture radar signals by radio frequency phase modulation equipment.
Further, in a preferred embodiment provided in the present application, a low noise signal amplification module is further disposed in the receiving module, and is configured to amplify the received signal.
Specifically, the receiving module is provided with a low-noise signal amplification module, which is mainly used for amplifying the received radiation source signal to meet the subsequent interference on the synthetic aperture radar signal.
Further, in a preferred embodiment provided in the present application, a detection unit is further disposed in the receiving module, and is configured to detect 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 provided by the present application, the detection unit may be a surveillance receiver, and the detection by the surveillance receiver determines whether the signal received in the receiving module is a synthetic aperture radar signal.
Fig. 2 shows an apparatus for radar jamming of synthetic aperture according to the present application. The equipment for correspondingly interfering the synthetic aperture radar by the receiving module 11 in the device for interfering the synthetic aperture radar comprises: a broadband receiving antenna, a low power amplifier LNA. The processing module 12 in the device for interfering with the synthetic aperture radar corresponds to the equipment for interfering with the synthetic aperture radar, and comprises the following equipment: the device comprises a splitter, a first filter bank, radio frequency phase modulation equipment, a second filter bank and a combiner. The equipment for correspondingly interfering the synthetic aperture radar by the output module 13 in the device for interfering the synthetic aperture radar comprises: power amplifier, broadband transmitting antenna. The controller of the device interfering with the synthetic aperture radar corresponds to the preprocessing module of the device interfering with the synthetic aperture radar.
Specifically, a broadband receiving antenna receives synthetic aperture radar signals, the signals are amplified by a low-power amplifier LNA and then respectively transmitted to two channels, and one channel enters radio frequency phase modulation equipment through a shunt and a first filter; the other channel enters the controller. The controller obtains characteristic information of the synthetic aperture radar signal and determines a parameter value for modulating the synthetic aperture radar signal. And the radio frequency phase modulation equipment modulates the synthetic aperture radar signal according to the parameter value of the modulated synthetic aperture radar signal determined by the controller. Before the synthetic aperture radar signal is modulated, the radio frequency phase modulation equipment needs to be processed by a splitter and a first filter, so that the central frequency and the bandwidth of the synthetic aperture radar signal are consistent with those of the radio frequency phase modulation equipment, and further the synthetic aperture radar signal is modulated. After modulating the synthetic aperture radar signal, the radio frequency phase modulation device further needs to be processed by the second filter bank and the combiner to generate an interference signal of the synthetic aperture radar signal processed by the radio frequency phase modulation device. And finally, amplifying the interference signal of the synthetic aperture radar signal by a power amplifier, and transmitting the interference signal by a broadband transmitting antenna.
The controller sends modulation values of 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 embodied in the control of the interference image block, the position, the size and the like. For example, the size of the interfering image blocks is controlled by the segment length of the synthetic aperture radar signal.
It is to 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 that there is an element defined as "comprising" … … does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. An apparatus for interfering with synthetic aperture radar, comprising:
the receiving module is used for receiving synthetic aperture radar signals;
the processing module is used for modulating the synthetic aperture radar signal by adopting a radio frequency multiphase segmented modulation model to generate an interference signal of the synthetic aperture radar signal;
and the output module is used for sending the generated interference signal of the synthetic aperture radar signal to the synthetic aperture radar.
2. The apparatus for synthetic aperture radar jamming according to claim 1, wherein the apparatus for synthetic aperture radar jamming is further provided with a pre-processing module for pre-processing the synthetic aperture radar signal to determine a jamming parameter that interferes with the synthetic aperture radar signal.
3. The apparatus of claim 1, wherein the radio frequency multi-phase segment modulation model performs multi-phase segment modulation on the synthetic aperture radar signal using at least a radio frequency phase modulation device.
4. The apparatus for synthetic aperture radar jamming according to claim 1, wherein a splitter is further provided in the apparatus for synthetic aperture radar jamming for splitting the synthetic aperture radar signal.
5. An apparatus for synthetic aperture radar jamming according to claim 1, wherein the apparatus for synthetic aperture radar jamming further comprises a filter bank for filtering the synthetic aperture radar signal.
6. The apparatus for synthetic aperture radar interference according to claim 5, wherein the filter bank filters synthetic aperture radar signals corresponding to a center frequency and a bandwidth of the radio frequency phase modulation device.
7. The apparatus for radar jamming synthetic aperture according to claim 1 wherein the receiving module further comprises a low noise signal amplification module for amplifying the received signal.
8. The apparatus of claim 1, wherein the receiving module further comprises a detecting unit for detecting whether the synthetic aperture radar signal is detected.
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| CN202210059095.9A CN114089291A (en) | 2022-01-19 | 2022-01-19 | Device for interfering synthetic aperture radar |
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| CN202210059095.9A CN114089291A (en) | 2022-01-19 | 2022-01-19 | Device for interfering synthetic aperture radar |
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| CN113534068A (en) * | 2021-07-14 | 2021-10-22 | 河南大学 | Non-linear frequency modulation signal modulation interference method and system |
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| CN106353739A (en) * | 2016-09-30 | 2017-01-25 | 中国人民解放军装备学院 | Multiple phase sectionalized modulation-based radar interference method |
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