CN203773045U - Ground ejection type jamming signal generation system for synthetic aperture radar - Google Patents
Ground ejection type jamming signal generation system for synthetic aperture radar Download PDFInfo
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- CN203773045U CN203773045U CN201320734227.XU CN201320734227U CN203773045U CN 203773045 U CN203773045 U CN 203773045U CN 201320734227 U CN201320734227 U CN 201320734227U CN 203773045 U CN203773045 U CN 203773045U
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Abstract
The utility model discloses a ground ejection type jamming signal generation system for an airborne or missile borne synthetic aperture radar (SAR). The jamming signal generation system is composed of a signal processing hardware part and a space erection device; the signal processing hardware part includes a ground control computer and a jammer; the jammer is specifically composed of a receiving antenna, a down-conversion assembly, a jamming signal modulation assembly, a real-time control computer, a frequency synthesis assembly, an up-conversion assembly and a transmitting antenna; and the space erection device is a high tower or a floating balloon and is an important component for ensuring the work performance of the ground ejection type jamming signal generation system. With modular design on the whole adopted, and the system has the advantages of high operability, portability and scalability, and can be used for occasions such as key target protection in important military areas and electronic countermeasure test of the synthetic aperture radar.
Description
Technical field
The utility model relates to sensing and processing, electronic interferences countermeasure techniques field, and specifically a kind of undesired signal of launching over the ground for synthetic aperture radar (SAR) produces system.
Background technology
Synthetic-aperture radar SAR is as a kind of imaging radar, conventionally be mounted on the dynamic platforms such as all kinds of aircrafts, guided missile and satellite, can form multi-platform, the three-dimensional reconnaissance and surveillance from various visual angles to battlefield, become the powerful of Implementation Strategy and tactical reconnaissance under modern military struggle condition, and can be used as precise guidance and hit and attack the sharp weapon of measures of effectiveness.Different from the traditional radar for detection of target, estimating target position and kinematic parameter, SAR obtains target information in the mode of imaging.Therefore, to the interference of SAR, can only pass through to reduce the quality of SAR image, thereby stop enemy from image, to detect, identify target and obtain useful information.
Existing research data shows, the conflicting mode of SAR is mainly contained noise blanket jamming, the three kinds of forms of disturbing are disturbed and launched over the ground to sky deception formula.At present, for the noise jamming of SAR, the experimental study achievement under more existing laboratory conditions, but due to the incoherent essential limitation of noise jamming, interference effect is unsatisfactory, and there is not yet the relevant report of being applied in actual SAR electronic countermeasure.And for sky deception formula is disturbed and launched interference over the ground, the still aspect in theoretical research and checking, there is not yet correlation test device and test result report.
For noise jamming, its undesired signal belongs to incoherent undesired signal.The in the situation that of the unknown of SAR signal parameter, because the bandwidth of noise interferences is often much larger than the bandwidth of SAR receiver, only have little undesired signal can enter the receiving cable of SAR, thereby capacity usage ratio is extremely low; Simultaneously, the imaging processing system of SAR is by carrying out two-dimensional correlation processing to the original echo receiving, there is very high processing gain for relevant backscattering echo, conventionally its processing gain can reach 60dB～70dB, if adopt noise compacting electronic interferences mode, the interference effect having reached, must improve the power of undesired signal greatly, offsets this part gain.
In order to improve the utilization factor of interfering energy, a lot of scholars have proposed the coherent interference method to sky deception formula.At present the research of the method is only limited to theoretical research aspect, its basic reason is under current techniques condition, be there is to a research prerequisite that is difficult to Project Realization in sky deception formula interference method, the flight track of supposing SAR is the straight line of standard, and the movement velocity of SAR platform is constant.But, SAR can be mounted on all kinds of dynamic objects such as aircraft, satellite or guided missile platform conventionally, and the flight track of these dynamic objects is uncertain often, its imaging processing system can be realized the correction processing to echoed signal by self sensory perceptual system and movement compensating algorithm, and for sky being cheated to formula conflicting mode, be difficult to realize the realistic simulation of orientation to phase of echo course, can only form point target or the one-dimensional range profile target of shielding real goal, the two-dimensional image (azimuth dimension and distance dimension) that cannot realize SAR disturbs.
For launching over the ground interference, be the comparatively novel interference method just having proposed in recent years, still inquire into the stage in interference mechanism and interference effect at present, theoretic achievement in research is also extremely rare.Disturb owing to launching over the ground the impact that is subject to topography and geomorphology, be difficult to set up the accurate simulation model of full digital, greatly limited theoretic flow of research, in the urgent need to setting up a set of interference simulation device as research/development platform, advance the further investigation of launching over the ground interference method.
The utility model launches on the basis of perturbation technique over the ground in further investigation, has proposed a kind of undesired signal of launching over the ground for missile-borne or airborne synthetic aperture radar and has produced system.That this undesired signal generation system possesses is small and exquisite, be convenient to the feature that install in high-altitude, by being installed on the High Altitude Platform such as high tower, floating air balls, carry out undesired signal modulation by detecing the SAR signal of receiving, and by the electromagnetic horn mode of specific region radiation earthward, realize the two-dimensional image coherent interference to SAR.
Utility model content
The utility model is to overcome the deficiency of existing SAR coherent interference method in theoretical research and Digital Simulation, for improving specific aim and the confidence level of achievement in research, provides a kind of undesired signal of launching over the ground for synthetic-aperture radar to produce system.Utilize this platform, the novel SAR coherent interference signal that can propose current academia carries out Practical Project checking, and according to actual tests result, for further research high-performance SAR imaging algorithm, tackling problems in key technologies, ACM active countermeasures new method provide important research/development platform.
In order to achieve the above object, furtheing investigate SAR imaging algorithm and launching over the ground on the basis of perturbation technique, technical solution adopted in the utility model is:
The utility model is made up of signal processing hardware part and space stringer.
Signal processing hardware part described in the utility model comprises jammer and ground control computer [8], and jammer is made up of receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], real-time control computer [4], frequently comprehensive assembly [5], up-converter [6] and emitting antenna [7]; Wherein, ground control computer [8] is connected by Ethernet with real-time control computer [4], and real-time control computer [4] is connected by Ethernet with undesired signal modulation component [3]; Receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], frequently comprehensive assembly [5], up-converter [6], emitting antenna all connect by radio frequency electrical cable between [7]; Described jammer [10] is fixedly mounted on the stringer of space.
As a kind of improvement of the present utility model, described space stringer is high tower [15] or floating air balls [16], space stringer is the important component part that ensures to launch over the ground undesired signal generation system works performance, fixedly mount jammer or by the balloon activity of floating, jammer is installed by high tower, select different mounting meanss according to actual conditions, be applicable to different working environments, applied widely.
Ground control computer described in the utility model [8] is moved non real-time WINDOW operating system.
Real-time control computer described in the utility model [4] operation Embedded Real-Time VxWorks Operating System.
Receiving antenna described in the utility model [1] and emitting antenna [7] adopt pyramidal horn antenna form; The hydraucone of described emitting antenna is with the direction fixed installation in the face of eradiation signal
Undesired signal modulation component described in the utility model is specially FPGA signal-processing board.
As shown in Figure 5, if hypothesis protected area is square, it is of a size of
, the 3dB beam angle of jammer emitting antenna is
, jammer is circular at the irradiation area on ground, its radius
need to meet following condition:
The antenna height of jammer should meet following condition:
The utility model is in the time of work, jammer is erected on the High Altitude Platform such as high tower, floating air balls that meets requirement for height, detect and receive on the basis that transmits of SAR, through undesired signal modulation treatment, undesired signal after appointed area transmitting modulation earthward, undesired signal is detectd receipts by SAR after ground-level ejection.Because interference echo has ensured and the similarity of target echo, can realize the two-dimensional image coherent interference of SAR.
Key point of the present utility model is not merely signal processing hardware part, depend on equally in the design and installation of high-altitude stringer, be choosing of jammer antenna height, and the beam angle of radiation electromagnetic horn, the factor of this two aspect has determined that jammer irradiates the orientation width of ground region, is the key point that realizes SAR two-dimensional image coherent interference.
What the utility model proposed launches undesired signal generation system over the ground, overcome the deficiency of existing SAR coherent interference method in theoretical research and digital emulation, for further studying high-performance SAR imaging algorithm, tackling problems in key technologies, ACM active countermeasures new method provides important research/development platform, improve the interactivity of research work, the specific aim of achievement in research and confidence level, wherein jammer part adopts modular design, and utilize commercialization mature modules to build, there is stronger versatility, operability and extensibility, can be integrated in standardized mini-plant cabinet, have easy for installation, be convenient to the advantages such as debugging, there is very high theory value and future in engineering applications.
Brief description of the drawings
Fig. 1 is the electrical structure block diagram of signal processing hardware part described in the utility model.
Fig. 2 is embodiment one of the present utility model.
Fig. 3 is embodiment two of the present utility model.
Fig. 4 is embodiment three of the present utility model.
Fig. 5 is the antenna height schematic diagram calculation of the utility model jammer.
Embodiment
For brief description of the drawings and embodiment, the utility model is described in further detail below.
The utility model operates mainly under test condition of external field, and the cabinet of jammer [10] should be taked anti-rust metal material, and carries out heat dissipation design.For rain-proof dust-proof, in the cabinet outside of whole jammer, cover glass also must be installed.Undesired signal produces receiving antenna [1] and the radiating antenna [7] of system and selects fine aluminum metal material; wherein the flight range of the loudspeaker actinal surface of receiving antenna [1] reply SAR receives signal; the loudspeaker actinal surface of radiating antenna [7] points to the appointed area that has certain relation with protection zone, and the antenna height of radiating antenna [7] should meet design requirement.
As shown in Figure 1, signal processing hardware part described in the utility model comprises jammer and ground control computer [8], and jammer specifically comprises receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], real-time control computer [4], frequently comprehensive assembly [5], up-converter [6] and emitting antenna [7].Wherein, ground control computer [8] is connected by Ethernet with real-time control computer [4], and real-time control computer [4] is connected by Ethernet with undesired signal modulation component [3]; Receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], frequently comprehensive assembly [5], up-converter [6], emitting antenna all connect by radio frequency electrical cable between [7]; Described jammer [10] is fixedly mounted on the stringer of space.
Ground control computer [8] is moved non real-time WINDOWS operating system, mainly complete the initial work of launching over the ground undesired signal generation system, concrete function is that SAR radar signal parameter is set, as frequency of operation, signal bandwidth, pulse repetition rate, beam angle, SAR kind of carrier and kinetic characteristic etc., and compiling generate data file is set, be downloaded to real-time control computer [4] by Ethernet.
Real-time control computer [4] operation Embedded Real-Time VxWorks Operating System, its function is according to the set systematic parameter of ground control computer [8], control in real time undesired signal modulation component [5] and meet the undesired signal of request for utilization with jamming signal type and the parameter generating set, and deliver to up-converter [6].
Receiving antenna [1] is responsible for receiving transmitting of SAR radar, and by radio-frequency cable, signal is delivered to down coversion assembly [2].
Down coversion assembly [2] will receive radiofrequency signal and downconvert on the desired IF-FRE scope of undesired signal modulation component [3] and amplitude leyel.
Undesired signal modulation component [3], under the real-time control of real-time control computer [4], through time domain, frequency domain modulation processing, produces suitable undesired signal to intermediate-freuqncy signal.
The undesired signal that up-converter [6] produces undesired signal modulation component [3] is converted on the operating frequency range of radiofrequency signal.
Emitting antenna [7] by Radio Frequency Interfere after power amplification, appointed area radiation earthward, undesired signal is detectd receipts by SAR after ground-level ejection, realizes interference to SAR.
embodiment 1:as shown in Figure 2, while protection for a long time for target of military importance, jammer [10], receiving antenna [1], emitting antenna [7] can be installed on high tower [15].Because jammer emitting antenna [7] is vertical or with the mode radiation earthward of small angle inclination; therefore crossbeam that need to mounting structure intensity meets the demands on the certain altitude of high tower; undesired signal generation system is mounted on crossbeam; avoid high tower itself to affect the radiance of signal, high tower should not be placed in protected area.The antenna height of jammer
meet
.
Undesired signal is launched undesired signal earthward through radiating antenna [7], and forms and disturb irradiation area [12], disturb target in irradiation area [12] that SAR is transmitted and undesired signal reflection after together received by SAR.SAR target echo signal generates SAR object region [11] after imaging processing, and interference echo signal generates interference imaging region [13] and [14] after SAR imaging processing.Region [12], [13] and the overlapping region of [14] are SAR and become in image, to be disturbed part.For SAR platform, target irradiation area [11] is consistent with the object region after imaging processing, and this is because target echo signal is all the direct reflection that region internal object transmits to SAR, there is no the change of travel path.But, for undesired signal, the overall path of undesired signal is SAR, jammer, path summation between terrain object, for target SAR direct signal, there is certain time delay in signal, this cause physical space disturb in irradiation area [12] a part of target disturb in imaging process can not actual imaging in its physical locations, but be mirrored the target place equal in length to same orientation space path, disturb irradiation area [12] after SAR imaging processing, to generate without modulated interferer imaging region [13], therefore disturbing irradiation area [12] is not consistent with disturbing imaging region [13], this just provides possibility for realizing to the interference of SAR.Undesired signal, through time delay modulation treatment, can generate multiple time delay modulated interferer imaging regions [14], thereby at the compacting interference effect apart from the paired SAR of synform.
Under single jammer performance, in orientation upwards, jammer should be erected at the orient core position of protected area, so that disturb the orientation target in irradiation area [12] to be consistent with SAR target imaging region after imaging processing; And in distance upwards, jammer should be tried one's best near the heading of SAR, so that disturb imaging region [13] and [14] to cover SAR target imaging region [11] completely.
embodiment 2:as shown in Figure 3, in the time launching over the ground undesired signal generation system as research device or compatibility test device, its target is mainly the checking validity of interference method or the interference free performance of SAR radar, undesired signal generation system is temporary service in high-altitude, therefore, jammer [10], receiving antenna [1], emitting antenna [7] can be able to be installed on floating air balls [16].Equally, float the lift-off height of air balls
meet
.
embodiment 3:in the situation that condition is permitted or when protected area distribution range is larger, can, by multiple jammer networkings, realize the effective protection to important goal region.The working method of jammer networking, should not destroy the singly constraint condition of station jammer work.As shown in Figure 4; jointly complete the protection to SAR target imaging region by four jammers; jammer is all erected on certain altitude; should ensure as far as possible jammer in the projection centre on ground the center, border in target imaging region; and ensure certain orientation cover width, to realize the protection completely to target imaging region.
It should be noted that, above-mentioned is only preferred embodiment of the present utility model, is not used for limiting protection domain of the present utility model, and the equivalents of having done on the basis of above-described embodiment all belongs to protection domain of the present utility model.
Claims (3)
1. produce a system for the undesired signal of launching over the ground of airborne or missile borne SAR, it is characterized in that, described undesired signal produces system and is made up of signal processing hardware part and space stringer; Described signal processing hardware part comprises jammer [10] and ground control computer [8], and described jammer [10] is made up of receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], real-time control computer [4], frequently comprehensive assembly [5], up-converter [6] and emitting antenna [7]; Described ground control computer [8] is connected by Ethernet with real-time control computer [4], and real-time control computer [4] is connected by Ethernet with undesired signal modulation component [3]; Described receiving antenna [1], down coversion assembly [2], undesired signal modulation component [3], frequently comprehensive assembly [5], up-converter [6], emitting antenna all connect by radio frequency electrical cable between [7]; Described jammer [10] is fixedly mounted on the stringer of space; Undesired signal modulation component [3] is FPGA signal-processing board.
2. the undesired signal of launching over the ground according to claim 1 produces system, it is characterized in that, described space stringer is high tower [15] or floating air balls [16].
3. the undesired signal of launching over the ground according to claim 1 produces system, it is characterized in that, described receiving antenna [1] and emitting antenna [7] all adopt pyramidal horn antenna form, and the hydraucone of described emitting antenna is with the direction fixed installation in the face of eradiation signal.
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| CN201320734227.XU CN203773045U (en) | 2013-11-20 | 2013-11-20 | Ground ejection type jamming signal generation system for synthetic aperture radar |
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| CN201320734227.XU CN203773045U (en) | 2013-11-20 | 2013-11-20 | Ground ejection type jamming signal generation system for synthetic aperture radar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018040728A (en) * | 2016-09-08 | 2018-03-15 | 株式会社パスコ | Ground surface deformation visualization device and ground surface deformation visualization program |
| CN114371452A (en) * | 2022-03-21 | 2022-04-19 | 北京宏锐星通科技有限公司 | Interference method and interference device for synthetic aperture radar motion compensation |
| CN115542252A (en) * | 2022-09-21 | 2022-12-30 | 扬州宇安电子科技有限公司 | Device for realizing radar main lobe target simulation and interference based on ground-air union |
-
2013
- 2013-11-20 CN CN201320734227.XU patent/CN203773045U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018040728A (en) * | 2016-09-08 | 2018-03-15 | 株式会社パスコ | Ground surface deformation visualization device and ground surface deformation visualization program |
| CN114371452A (en) * | 2022-03-21 | 2022-04-19 | 北京宏锐星通科技有限公司 | Interference method and interference device for synthetic aperture radar motion compensation |
| CN114371452B (en) * | 2022-03-21 | 2022-07-08 | 北京宏锐星通科技有限公司 | Interference method and interference device for synthetic aperture radar motion compensation |
| CN115542252A (en) * | 2022-09-21 | 2022-12-30 | 扬州宇安电子科技有限公司 | Device for realizing radar main lobe target simulation and interference based on ground-air union |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20171120 |