CN104865559A - Synthetic aperture radar cooperative ejection type interference method and synthetic aperture radar cooperative ejection type interference system - Google Patents
Synthetic aperture radar cooperative ejection type interference method and synthetic aperture radar cooperative ejection type interference system Download PDFInfo
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- CN104865559A CN104865559A CN201410048189.1A CN201410048189A CN104865559A CN 104865559 A CN104865559 A CN 104865559A CN 201410048189 A CN201410048189 A CN 201410048189A CN 104865559 A CN104865559 A CN 104865559A
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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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- 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
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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Abstract
The present invention provides a synthetic aperture radar cooperative ejection type interference method and a synthetic aperture radar cooperative ejection type interference system. The method comprises the steps that a plurality of repeaters are arranged in a protected target area, within the whole synthetic aperture time, the plurality of repeaters radiate the interference signals to the respective and corresponding target sub-areas according to a preset cooperation work mode, so that in one synthetic aperture time, the number of the scatter echo pulses formed by the plurality of target sub-areas is less than the lowest constraint which can be processed correctly and does not cause the azimuth ambiguity, and the Doppler undersampling or non-linear sampling of a synthetic aperture radar to a target area ejection wave is caused; the false target images possessing the real ground object characteristics are formed after the imaging processing, and the real targets in the images are difficult to identify. In addition, the number of the repeaters arranged in the protected target area and the cooperative work mode of the repeaters can be controlled flexibly. The synthetic aperture radar cooperative ejection type interference method and the synthetic aperture radar cooperative ejection type interference system have the advantages of being simple and flexible to install and easy to realize, being large in interference coverage range, etc., and have the wide application prospect.
Description
Technical field
The invention belongs to ECM (Electronic Countermeasures) field, be specifically related to a kind of synthetic-aperture radar and work in coordination with Rebound jamming method and system.
Background technology
Synthetic-aperture radar (Synthetic Aperture Radar; SAR) be a kind of high-resolution imaging radar, its image-forming principle is: synthetic-aperture radar is using the motion platform such as aircraft or satellite as radar carrier, in space according to certain orbital motion, in flight course, periodically to regional aim transponder pulse signal, and the pulse echo of receiving area target reflection, carry out Coherent processing by paired pulses echo, obtain the high-resolution ground image of distance peacekeeping azimuth dimension two dimension.
Synthetic-aperture radar mainly relies on signal transacting to obtain the high resolving power of distance peacekeeping azimuth dimension, and wherein, distance dimension high resolving power by launching wideband correlation, and carries out process of pulse-compression realization to echo; Azimuth dimension high resolving power then passes through the relative motion of radar small sized antenna and target, the target echo signal that radar receives at diverse location is carried out Coherent processing, synthesizes the antenna that virtual aperture is very large, improves azimuth dimension resolution.Because signal transacting gain is very high, generally reach 10
7above, therefore, synthetic-aperture radar has extremely strong antijamming capability.
Synthetic-aperture radar except have imaging amplitude broad, imaging resolution high, can round-the-clock, round-the-clock carry out except imaging reconnaissance, can also pretend through routine, as trees or camouflage net etc., target imaging under hidden to camouflage, find the aircraft in blindage, even can through the facility of dry earth's surface discovery underground number meter Shen.Therefore, synthetic-aperture radar has been widely used in military strategy tactical reconnaissance, targets in ocean monitors, attack guiding, Hitting Effect Evaluation etc., and in IT-based warfare, status is important outstanding with effect, has become a key character of tech war.
Current, the Synthetic Aperture Radar satellite of unfriendly country day and night collects my army's ground military deployment situation, this for safeguard China's national security and from now on military campaign preparation constitute serious threat.Therefore, the interference studying Technologies Against Synthetic Aperture Radar has Great significance.
At present, domestic and international Technologies Against Synthetic Aperture Radar perturbation technique research, be summed up and be mainly divided into two large classes, summarize see SAR perturbation technique, Chinese Radar the 4th phase in 2009, Wu Guangzhi etc.: (one) noise blanket jamming: noise blanket jamming Technologies Against Synthetic Aperture Radar is substantially without impact, this is because synthetic-aperture radar all have employed Coherent processing in distance peacekeeping azimuth dimension, and noise is noncoherent, noise by be subject to Range compress than with Azimuth Compression than product suppression doubly, generally reach 10
6the above order of magnitude.When Technologies Against Synthetic Aperture Radar implements noise; only Range compress and Azimuth Compression two factors just force noise jammer Effective Radiated Power will reach million times of magnitudes; consider other processing gain again; if Technologies Against Synthetic Aperture Radar implements effectively interference; then noise jamming system must can produce enough large power, and all targets in real antenna beam just can be protected not spied out.Therefore Technologies Against Synthetic Aperture Radar implements noise needs very large emissive power.(2) repeating jamming: repeating jamming Technologies Against Synthetic Aperture Radar has certain interference effect, but effect is still limited, analyzes in two kinds of situation below.The first situation: only have synthetic-aperture radar intrapulse feature in retransmitted jamming signal, then undesired signal is relevant in distance dimension, but is noncoherent in azimuth dimension, and at this moment, the radar image that undesired signal is formed is along orientation to the line extended; The second situation: the intrapulse feature not only having synthetic-aperture radar in retransmitted jamming signal, and also have feature between arteries and veins, then undesired signal is relevant in distance dimension, is also relevant in azimuth dimension, and at this moment, the radar image that undesired signal is formed is a bright spot; The undesired signal produced within a certain period of time due to jammer is always limited, and therefore, aforesaid way only can produce limited bright line or bright spot on radar image.And on a width radar image, only increase some bright lines and bright spot, although have certain interference effect, from image, still can see some targets, not reach the object of complete containment objective.
In sum, there is the deficiency of the large and cheating interference weak effect of jamming power in existing Technologies Against Synthetic Aperture Radar interference method, is difficult to effectively to destroy or weaken oppose the Strategy & Tactics reconnaissance capability of synthetic-aperture radar to one's own side or friendly side ground military target.
Summary of the invention
For the defect that prior art exists, the invention provides a kind of synthetic-aperture radar and work in coordination with Rebound jamming method and system, there is the advantage that jamming power is little, interference effect strong and can adjust interference effect flexibly, also have install simple, flexibly, interference coverage is large, be easy to the advantages such as realization, be with a wide range of applications.
The technical solution used in the present invention is as follows:
The invention provides a kind of synthetic-aperture radar and work in coordination with Rebound jamming method, comprise the following steps:
S1, lay n portion transponder in n the position of protected target area L, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; Wherein, n portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2;
S2, configures the target subregion corresponding respectively with each transponder, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, target subregion described in each belongs to a part of described target area L or belongs to the adjacent area of described target area L;
S3, when described synthetic-aperture radar launches synthetic-aperture radar original signal to described target area L, this synthetic-aperture radar original signal reflects through described target area L, obtains radar original echoed signals and is received by described synthetic-aperture radar; Meanwhile, the m portion transponder being in synthetic-aperture radar irradiation area receives described synthetic-aperture radar original signal respectively, and carries out signal transacting to described synthetic-aperture radar original signal respectively, obtains m synthetic-aperture radar undesired signal; Wherein, m≤n;
S4, described m portion transponder within the whole synthetic aperture time by the Cooperation rule preset to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, through the scattering of described target subregion, ripple signal is launched in formation, and this launches ripple signal and is also received by described synthetic-aperture radar;
S5, described synthetic-aperture radar receives described radar original echoed signals and describedly launches ripple signal, through imaging processing, obtains the radar image with interfering picture.
Preferably, transponder described in each portion is vehicle-mounted or ball idling hair device.
Preferably, in S3, signal transacting is carried out to described synthetic-aperture radar original signal, obtain synthetic-aperture radar undesired signal and be specially: signal is carried out to described synthetic-aperture radar original signal and amplifies process, obtain synthetic-aperture radar undesired signal.
Preferably, in S4, described m portion transponder is specially to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion by the Cooperation rule preset within the whole synthetic aperture time:
Described m portion transponder by the order switch operating preset, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion; Or
Random sequence switch operating pressed by described m portion transponder, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion.
The present invention also provides a kind of synthetic-aperture radar to work in coordination with Rebound jamming system, comprising: the n portion transponder laid in n the position of protected target area L;
Wherein, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; N portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2; Each transponder includes: receiving antenna, power amplifier, signal processor, emitting antenna and microwave switch;
By adjusting the sensing of described emitting antenna, make each transponder corresponding target subregion respectively, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, target subregion described in each belongs to a part of described target area L or belongs to the adjacent area of described target area L;
When described synthetic-aperture radar launches synthetic-aperture radar original signal to described target area L, this synthetic-aperture radar original signal reflects through described target area L, obtains radar original echoed signals and is received by described synthetic-aperture radar; Meanwhile, the m portion transponder being in synthetic-aperture radar irradiation area all performs following operation: receive described synthetic-aperture radar original signal by described receiving antenna, and described synthetic-aperture radar original signal is transferred to described power amplifier; Described power amplifier carries out signal to described synthetic-aperture radar original signal and amplifies process, then is transferred to described signal processor, after described signal processor processes, obtains synthetic-aperture radar undesired signal; Wherein, m≤n;
The each self-configuring of m portion transponder independently microwave switch, by controlling the make-and-break time of each microwave switch, control m portion transponder within the whole synthetic aperture time by the Cooperation rule preset by emitting antenna to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, through the scattering of described target subregion, ripple signal is launched in formation, this launches ripple signal and is also received by described synthetic-aperture radar, through synthetic aperture Radar Imaging Processing, obtain the radar image with interfering picture.
Preferably, transponder described in each portion is vehicle-mounted or ball idling hair device.
Preferably, for the microwave switch of described transponder, when control this microwave switch be in conducting state time, the radiation of target subregion from described transponder to correspondence described in synthetic-aperture radar undesired signal; And when described microwave switch is in closed condition, described transponder not to correspondence the radiation of target subregion described in synthetic-aperture radar undesired signal.
Preferably, by controlling the on off operating mode of transponder microwave switch, control m portion transponder is by the order switch operating preset, or control m portion transponder is by random sequence switch operating.
Synthetic-aperture radar provided by the invention works in coordination with Rebound jamming method and system, has the following advantages:
(1) some transponders are laid in protected target area, within the whole synthetic aperture time, multiple stage transponder is by the collaborative work mode preset, to each self-corresponding target subregion Radiation synthesize aperture radar undesired signal, thus cause in the synthetic aperture time, there is scatter echo pulse number that some target subregions are formed to be less than and can be correctly processed and the minimum constraint of azimuth ambiguity can not be caused, synthetic-aperture radar is caused to launch Doppler's lack sampling or the nonlinear sampling of ripple to target area, the decoy image with true characters of ground object is formed after imaging processing, be difficult to the real goal in recognition image, effective destruction or weaken enemy's synthetic-aperture radar to the Strategy & Tactics reconnaissance capability of one's own side or friendly side ground military target,
(2) the transponder quantity laid protected target area can be controlled flexibly; and, the collaborative work mode of each transponder can be controlled flexibly, therefore; have install simple, flexibly, interference coverage is large, be easy to the advantages such as realization, be with a wide range of applications.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that synthetic-aperture radar provided by the invention works in coordination with Rebound jamming method;
Fig. 2 is the specific embodiment schematic diagram that synthetic-aperture radar provided by the invention works in coordination with Rebound jamming system;
Fig. 3 is the emulating image of undisturbed ground point target after SAR imaging processing;
Fig. 4 for ground point target shown in Fig. 3 under a kind of Cooperation rule be disturbed after emulating image after SAR imaging processing;
Fig. 5 for ground point target shown in Fig. 3 under another kind of Cooperation rule be disturbed after emulating image after SAR imaging processing;
Fig. 6 is the emulating images of undisturbed distribution objectives after SAR imaging processing;
Fig. 7 for distribution objectives shown in Fig. 6 be disturbed after emulating image after SAR imaging processing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, the invention provides a kind of synthetic-aperture radar and work in coordination with Rebound jamming method, comprise the following steps:
S1, lay n portion transponder in n the position of protected target area L, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; Wherein, n portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2;
In practical application, each portion transponder can be vehicle-mounted or ball idling hair device, facilitates each transponder to move.
S2, configures the target subregion corresponding respectively with each transponder, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, each target subregion belongs to a part of target area L or belongs to the adjacent area of target area L;
See Fig. 2, the synthetic-aperture radar 2 that flying platform 1 carries with the movement transponder pulse electromagnetic wave over the ground of flying platform 1, scouting of imaging.Lay 3 transponders altogether at target area L, be respectively transponder 1, transponder 2 and transponder 3.Further, pointed to by the emitting antenna adjusting each transponder, make the corresponding target subregion 1 of transponder 1, the corresponding target subregion 2 of transponder 2, the corresponding target subregion 3 of transponder 3.
S3, when described synthetic-aperture radar launches synthetic-aperture radar original signal to described target area L, this synthetic-aperture radar original signal reflects through described target area L, obtains radar original echoed signals and is received by described synthetic-aperture radar; Simultaneously, the m portion transponder being in synthetic-aperture radar irradiation area receives synthetic-aperture radar original signal respectively, and Technologies Against Synthetic Aperture Radar original signal carries out signal transacting respectively, such as, Technologies Against Synthetic Aperture Radar original signal is carried out signal and is amplified process, thus obtains m synthetic-aperture radar undesired signal; Wherein, m≤n;
Still for Fig. 2, transponder 1, transponder 2 and transponder 3 are all in synthetic-aperture radar irradiation area, therefore, these three transponders all receive synthetic-aperture radar original signal, carry out signal by Technologies Against Synthetic Aperture Radar original signal and amplify process, thus obtain 3 synthetic-aperture radar undesired signals.
S4, described m portion transponder within the whole synthetic aperture time by the Cooperation rule preset to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, through the scattering of described target subregion, ripple signal is launched in formation, and this launches ripple signal and is also received by described synthetic-aperture radar;
In this step, the each self-configuring of each portion transponder independently microwave switch, by controlling the make-and-break time of each microwave switch, control m portion transponder within the whole synthetic aperture time by the Cooperation rule preset by emitting antenna to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, be specially: when controlling microwave switch and being in conducting state, transponder is to the target subregion Radiation synthesize aperture radar undesired signal of correspondence; And when microwave switch is in closed condition, transponder is not to the target subregion Radiation synthesize aperture radar undesired signal of correspondence.
The Cooperation rule that each repeater operation is followed according to actual needs, flexible adjustment, below two kinds of Cooperation rules are only enumerated: the first, each transponder by the order switch operating preset, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion.Still for Fig. 2, transponder is all configured with independently microwave switch, by controlling the break-make of microwave switch, control transponder 1, transponder 2 and transponder 3 and work successively in order, that is: transponder 1 is first to target subregion 1 Radiation synthesize aperture radar undesired signal; Through certain time interval, transponder 2 is to target subregion 2 Radiation synthesize aperture radar undesired signal; Through certain time interval, transponder 3 is to target subregion 3 Radiation synthesize aperture radar undesired signal; Therefore, these three regions of target subregion 1, target subregion 2 and target subregion 3 are interrupted real estate life and are launched ripple signal, wave impulse number only has normal imaging required pulse number 1/3 for launching of causing these three regions of target subregion 1, target subregion 2 and target subregion 3 to produce, thus cause Doppler's lack sampling of target subregion 1, target subregion 2 and these three area echos of target subregion 3, after imaging, form doppler ambiguity image.The second, random sequence switch operating pressed by each transponder, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion.Still for Fig. 2, control the switch operating that transponder 1, transponder 2 and transponder 3 are random, such as first 3 transponders work successively by transponder 1, transponder 3 and transponder 2 order, then the sequential working of transponder 3, transponder 1 and transponder 2 is pressed again, then new order is converted again, so until synthetic-aperture radar flies over target area, thus this trizonally launches ripple Doppler nonlinear sampling to cause target subregion 1, target subregion 2 and target subregion 3, forms special doppler ambiguity image after imaging.
S5, described synthetic-aperture radar receives described radar original echoed signals and describedly launches ripple signal, through imaging processing, obtains the radar image with interfering picture.This radar image comprises nearly resolution large area false target jamming profile image, causes image interpretation to fail to judge or judges target by accident, reaches the object of protection ground military target.
See Fig. 2, the present invention also provides a kind of synthetic-aperture radar to work in coordination with Rebound jamming system, comprising: the n portion transponder laid in n the position of protected target area L; Wherein, each portion transponder can be vehicle-mounted or ball idling hair device.
Wherein, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; N portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2; Each transponder includes: receiving antenna, power amplifier, signal processor, emitting antenna and microwave switch; For the microwave switch of transponder, when control this microwave switch be in conducting state time, the radiation of target subregion from described transponder to correspondence described in synthetic-aperture radar undesired signal; And when described microwave switch is in closed condition, described transponder not to correspondence the radiation of target subregion described in synthetic-aperture radar undesired signal.
By adjusting the sensing of emitting antenna, make each transponder corresponding target subregion respectively, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, target subregion described in each belongs to a part of described target area L or belongs to the adjacent area of described target area L;
When synthetic-aperture radar launches synthetic-aperture radar original signal to target area L, this synthetic-aperture radar original signal reflects through target area L, obtains radar original echoed signals and be synthesized aperture radar receiving; Meanwhile, the m portion transponder being in synthetic-aperture radar irradiation area all performs following operation: receive described synthetic-aperture radar original signal by described receiving antenna, and described synthetic-aperture radar original signal is transferred to described power amplifier; Described power amplifier carries out signal to described synthetic-aperture radar original signal and amplifies process, then is transferred to described signal processor, after described signal processor processes, obtains synthetic-aperture radar undesired signal; Wherein, m≤n;
The each self-configuring of m portion transponder independently microwave switch, by controlling the make-and-break time of each microwave switch, control m portion transponder within the whole synthetic aperture time by the Cooperation rule preset by emitting antenna to each self-corresponding target subregion Radiation synthesize aperture radar undesired signal, through the scattering of described target subregion, ripple signal is launched in formation, this launches ripple signal and is also received by described synthetic-aperture radar, that is, the signal that synthetic-aperture radar receives be normal radar echo signal and each transponder produce launch ripple signal sum, after imaging processing, diameter radar image produces the large area interfering picture with true characters of ground object, radar image is produced seriously fuzzy, make image interpretation difficulty, reach the object of protection ground military target.In addition, the on off operating mode of the microwave switch of each transponder can be controlled according to the pseudo-random code sequence preset.
This synthetic-aperture radar is worked in coordination with Rebound jamming system and is applicable to implement hidden electronic interferences to enemy's synthetic-aperture radar; destroy or weaken enemy's synthetic-aperture radar to the Strategy & Tactics reconnaissance capability of one's own side or friendly side ground military target; protection ground military target; be specially adapted to be arranged on extensive moving target group; such as: tank group etc.; reach protection tank group and be not synthesized the object that aperture radar spies out, also have the following advantages:
(1) interference method is simple, and EVAC (Evacuation Network Computer Model) is installed simply, cost is low, be easy to realization;
(2) interference controls simple, flexible;
(3) jamming equipment is hidden, is not easily scouted, locates;
(4) disturb coverage large, be easy to realize;
(5) can realize simultaneously to the antagonism of multi-section synthetic-aperture radar.
Below by point target and distribution objectives, the synthetic aperture radar image-forming l-G simulation test before and after interference illustrates practical application effect of the present invention.
(1) the MATLAB emulation of point target imaging
As shown in Figure 3, be the emulating image of undisturbed ground point target after SAR imaging processing; Ground point target lays three repeater-transmitters, be respectively repeater-transmitter A, repeater-transmitter B and repeater-transmitter C, wherein, repeater-transmitter A corresponding target subregion A, repeater-transmitter B corresponding target subregion B, repeater-transmitter C corresponding target subregion C, target subregion A, target subregion B and target subregion C are a sub regions of ground point target, control transponder A, transponder B and transponder C work in order successively, that is: transponder A is first to target subregion A Radiation synthesize aperture radar undesired signal; Through certain time interval, transponder B is to target subregion beta radiation synthetic-aperture radar undesired signal; Through certain time interval, transponder C is to target subregion C Radiation synthesize aperture radar undesired signal; Thus after obtaining being disturbed shown in Fig. 4, the emulating image of ground point target after SAR imaging processing.Change the Cooperation rule of three transponders, make 3 transponder periodic duties in the following order, that is: first work successively by transponder A, transponder C and transponder B order, then the sequential working of transponder C, transponder A and transponder B is pressed again, then work successively by transponder B, transponder C and transponder A order, so until synthetic-aperture radar flies over target area, thus after obtaining being disturbed shown in Fig. 5, the emulating image of ground point target after SAR imaging processing.
Comparison diagram 3, Fig. 4 and Fig. 5, can find out, synthetic-aperture radar provided by the invention works in coordination with Rebound jamming method and system, effectively can disturb the imaging of synthetic-aperture radar, make the real goal that synthetic-aperture radar is difficult in recognition image, effectively destroy or weaken the Strategy & Tactics reconnaissance capability of enemy's synthetic-aperture radar to one's own side or friendly side ground military target; And, the synergistic mechanism of each transponder can be changed flexibly, and then change interference effect flexibly, both can realize cheating interference, compacting interference can be realized again.
(2) the MATLAB emulation of distribution objectives imaging
As shown in Figure 6, be the emulating image of undisturbed distribution objectives after SAR imaging processing; As shown in Figure 7, after being disturbed, the emulating image of distribution on ground target after SAR imaging processing, comparison diagram 6 and Fig. 7, further demonstrate validity and dirigibility that the present invention works in coordination with Rebound jamming method.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (8)
1. synthetic-aperture radar works in coordination with a Rebound jamming method, it is characterized in that, comprises the following steps:
S1, lay n portion transponder in n the position of protected target area L, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; Wherein, n portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2;
S2, configures the target subregion corresponding respectively with each transponder, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, target subregion described in each belongs to a part of described target area L or belongs to the adjacent area of described target area L;
S3, when described synthetic-aperture radar launches synthetic-aperture radar original signal to described target area L, this synthetic-aperture radar original signal reflects through described target area L, obtains radar original echoed signals and is received by described synthetic-aperture radar; Meanwhile, the m portion transponder being in synthetic-aperture radar irradiation area receives described synthetic-aperture radar original signal respectively, and carries out signal transacting to described synthetic-aperture radar original signal respectively, obtains m synthetic-aperture radar undesired signal; Wherein, m≤n;
S4, described m portion transponder within the whole synthetic aperture time by the Cooperation rule preset to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, through the scattering of described target subregion, ripple signal is launched in formation, and this launches ripple signal and is also received by described synthetic-aperture radar;
S5, described synthetic-aperture radar receives described radar original echoed signals and describedly launches ripple signal, through imaging processing, obtains the radar image with interfering picture.
2. synthetic-aperture radar according to claim 1 works in coordination with Rebound jamming method, it is characterized in that, transponder described in each portion is vehicle-mounted or ball idling hair device.
3. synthetic-aperture radar according to claim 1 works in coordination with Rebound jamming method, it is characterized in that, in S3, signal transacting is carried out to described synthetic-aperture radar original signal, obtain synthetic-aperture radar undesired signal to be specially: carry out signal to described synthetic-aperture radar original signal and amplify process, obtain synthetic-aperture radar undesired signal.
4. synthetic-aperture radar according to claim 1 works in coordination with Rebound jamming method, it is characterized in that, in S4, described m portion transponder is specially to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion by the Cooperation rule preset within the whole synthetic aperture time:
Described m portion transponder by the order switch operating preset, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion; Or
Random sequence switch operating pressed by described m portion transponder, by certain time interval successively to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion.
5. synthetic-aperture radar works in coordination with a Rebound jamming system, it is characterized in that, comprising: the n portion transponder laid in n the position of protected target area L;
Wherein, the working frequency range of each transponder is identical with the working frequency range of synthetic-aperture radar; N portion transponder is designated as transponder 1, transponder 2... transponder n; N >=2; Each transponder includes: receiving antenna, power amplifier, signal processor, emitting antenna and microwave switch;
By adjusting the sensing of described emitting antenna, make each transponder corresponding target subregion respectively, then transponder 1, transponder 2... transponder n corresponding target subregion 1, target subregion 2... target subregion n respectively; Wherein, target subregion described in each belongs to a part of described target area L or belongs to the adjacent area of described target area L;
When described synthetic-aperture radar launches synthetic-aperture radar original signal to described target area L, this synthetic-aperture radar original signal reflects through described target area L, obtains radar original echoed signals and is received by described synthetic-aperture radar; Meanwhile, the m portion transponder being in synthetic-aperture radar irradiation area all performs following operation: receive described synthetic-aperture radar original signal by described receiving antenna, and described synthetic-aperture radar original signal is transferred to described power amplifier; Described power amplifier carries out signal to described synthetic-aperture radar original signal and amplifies process, then is transferred to described signal processor, after described signal processor processes, obtains synthetic-aperture radar undesired signal; Wherein, m≤n;
The each self-configuring of m portion transponder independently microwave switch, by controlling the make-and-break time of each microwave switch, control m portion transponder within the whole synthetic aperture time by the Cooperation rule preset by emitting antenna to synthetic-aperture radar undesired signal described in the radiation of each self-corresponding target subregion, through the scattering of described target subregion, ripple signal is launched in formation, this launches ripple signal and is also received by described synthetic-aperture radar, through synthetic aperture Radar Imaging Processing, obtain the radar image with interfering picture.
6. synthetic-aperture radar according to claim 5 works in coordination with Rebound jamming system, it is characterized in that, transponder described in each portion is vehicle-mounted or ball idling hair device.
7. synthetic-aperture radar according to claim 5 works in coordination with Rebound jamming system, it is characterized in that, for the microwave switch of described transponder, when control this microwave switch be in conducting state time, the radiation of target subregion from described transponder to correspondence described in synthetic-aperture radar undesired signal; And when described microwave switch is in closed condition, described transponder not to correspondence the radiation of target subregion described in synthetic-aperture radar undesired signal.
8. synthetic-aperture radar according to claim 5 works in coordination with Rebound jamming system, it is characterized in that, by controlling the on off operating mode of transponder microwave switch, control m portion transponder is by the order switch operating preset, or control m portion transponder is by random sequence switch operating.
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