CN203930058U - A kind of synthetic-aperture radar Area Objects Echo Signal Simulator - Google Patents
A kind of synthetic-aperture radar Area Objects Echo Signal Simulator Download PDFInfo
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- CN203930058U CN203930058U CN201420114220.2U CN201420114220U CN203930058U CN 203930058 U CN203930058 U CN 203930058U CN 201420114220 U CN201420114220 U CN 201420114220U CN 203930058 U CN203930058 U CN 203930058U
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Abstract
The application relates to a kind of synthetic-aperture radar Area Objects Echo Signal Simulator that is applied to the testing performance index of synthetic-aperture radar.Comprise: dsp board; First memory; FPGA computing array, described FPGA computing array comprises a plurality of FPGA computing boards; The the first cumulative plate being connected with FPGA computing array; The DRFM being connected with the first cumulative plate.Therefore, can calculate in real time the echo information of each target scattering point, thus Real-time Obtaining Area Objects echoed signal, with the performance index of real-time testing synthetic-aperture radar.
Description
Technical field
The application relates to radar performance test and simulator field, particularly a kind of synthetic-aperture radar Area Objects Echo Signal Simulator.
Background technology
Synthetic-aperture radar is a kind of modern high-resolution microwave imaging radar, and along with the development of hyundai electronics integrated technology, synthetic-aperture radar becomes increasingly complex, and needs the property indices of Technologies Against Synthetic Aperture Radar to test.
When the property indices of Technologies Against Synthetic Aperture Radar is tested, need to obtain a large amount of radar return data by true experiment.But because synthetic-aperture radar becomes increasingly complex, cause carrying out the overlong time that true experiment obtains a large amount of radar return data, high cost.In order to address this problem, produced Synthetic Aperture Radar Echo simulator, Synthetic Aperture Radar Echo simulator obtains a large amount of radar return data by simulation means, has shortened the time of obtaining a large amount of radar return data, has reduced testing cost.
But it is slow that current Synthetic Aperture Radar Echo simulator calculates the speed of echo modulation intelligence of each target scattering point, time is long, cause can not each target scattering point of Real-time Obtaining echo modulation intelligence, thereby can not Real-time Obtaining Area Objects echoed signal, with the performance index of real-time testing synthetic-aperture radar.Therefore be badly in need of a kind of echo modulation intelligence that can each target scattering point of Real-time Obtaining, thus energy Real-time Obtaining Area Objects echoed signal, with the Synthetic Aperture Radar Echo simulator of real-time testing synthetic-aperture radar.
Utility model content
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of synthetic-aperture radar Area Objects Echo Signal Simulator, and to reach the object of the performance index of real-time testing synthetic-aperture radar, technical scheme is as follows:
A synthetic-aperture radar Area Objects Echo Signal Simulator, is applied to the testing performance index of synthetic-aperture radar, comprising:
Dsp board;
First memory;
With the FPGA computing array that described first memory is connected with described dsp board, described FPGA computing array comprises a plurality of FPGA computing boards;
The the first cumulative plate being connected with described FPGA computing array;
The digital radiofrequency memory DRFM being connected with the described first cumulative plate.
Preferably, described dsp board comprises:
For calculating the radar site computing module of the radar site of described each repetition of synthetic-aperture radar;
For calculating the first range of exposures counter of the range of exposures of described synthetic-aperture radar;
Be connected with described the first range of exposures counter, the calculation task of the echo modulation intelligence of the target scattering point in described range of exposures is divided into a plurality of calculating subtask, distribute to the task distribution module that a plurality of FPGA computing boards calculate.
Preferably, described FPGA computing board comprises:
For calculating the fpga chip group of the echo modulation intelligence of a plurality of target scattering points, described fpga chip group comprises the fpga chip of a plurality of pipeline organizations;
Be connected with described fpga chip group, the first range gate modulation intelligence totalizer of the echo modulation intelligence of exporting for cumulative each fpga chip of described fpga chip group;
Wherein said fpga chip comprises:
For according to the range of exposures of described synthetic-aperture radar and the origin coordinates in the whole simulating scenes of described synthetic-aperture radar region, calculate the coordinate computing module of the coordinate of described each target scattering point in described whole simulating scenes region;
Be connected with described coordinate computing module, for according to the coordinate of described target scattering point and the coordinate of described synthetic-aperture radar, calculate the distance calculator of the radial distance between described target scattering point and described synthetic-aperture radar;
Be connected with described distance calculator, for each target scattering of parallel computation, put the phase calculation module group of the phase place of corresponding echo modulation intelligence, described phase calculation module group comprises a plurality of phase calculation modules, the target scattering point of the corresponding default number of each phase calculation module;
Be connected with described coordinate computing module, for each target scattering of parallel computation, put the magnitude computation module group of the amplitude of corresponding echo modulation intelligence, described magnitude computation module group comprises a plurality of magnitude computation module, the target scattering point of the corresponding default number of each magnitude computation module;
Be connected with described distance calculator with described phase calculation module group, described magnitude computation module group, for putting according to each target scattering the range gate unit number that corresponding radial distance calculates each target scattering point, according to the phase place of each target scattering point and amplitude, calculate the echo modulation intelligence of each target scattering point, and the echo modulation intelligence of the identical target scattering point of range gate is added up, the second distance door modulation intelligence totalizer of the echo modulation intelligence after being added up.
Preferably, described magnitude computation module comprises:
Be connected with described coordinate computing module, for by described target scattering point, the coordinate conversion under geographic coordinate system is the coordinate under antenna coordinate system and the coordinate conversion under geographic coordinate system is the coordinate system converter of the coordinate under antenna coordinate system by described synthetic-aperture radar;
Be connected with described coordinate system converter, for the coordinate under antenna coordinate system and the described synthetic-aperture radar coordinate under antenna coordinate system according to described target scattering point, calculate the weighted calculation module of the antenna radiation pattern weighted value of described synthetic-aperture radar;
Be connected with described weighted calculation module, for the antenna radiation pattern weighted value of described synthetic-aperture radar and the scattering properties of described target scattering point are multiplied each other, obtain the first magnitude calculator that described target scattering is put the amplitude of corresponding echoed signal.
Preferably, also comprise:
For storing the second memory of the elevation fluctuating data of each target scattering point in the range of exposures of described synthetic-aperture radar.
Preferably, described dsp board also comprises:
For the elevation fluctuating data of described each target scattering point being processed to the occlusion test module of the block information that obtains each target scattering point.
Preferably, also comprise: for the block information of the scattering properties of the antenna radiation pattern weighted value of described synthetic-aperture radar, described target scattering point and described target scattering point is multiplied each other, obtain the second magnitude calculator that described target scattering is put the amplitude of corresponding echo modulation intelligence.
Preferably, also comprise:
For described Area Objects echo modulation intelligence being carried out to the second cumulative plate that range ambiguity is processed and power attenuation is processed.
Preferably, also comprise:
Be connected with described DRFM, for the mass memory plate of Area Objects echoed signal described in real-time storage;
For calculating the second range of exposures counter of the number of the target scattering point in the range of exposures that do not overlap of described synthetic-aperture radar in two adjacent repetitions of described synthetic-aperture radar.
Compared with prior art, the application's beneficial effect is:
In this application, utilize dsp board to calculate the radar site of described synthetic-aperture radar, the range of exposures of described synthetic-aperture radar and the calculation task of each FPGA computing board in FPGA computing array is distributed, the calculation task of each FPGA computing board that FPGA computing array can distribute based on described dsp board, according to the radar site of described synthetic-aperture radar and the scattering properties value of described each target scattering point, parallel computation goes out the echo modulation intelligence of each target scattering point, shortened greatly the echo modulation intelligence time used of having calculated all target scattering points, improved the speed of the echo modulation intelligence that calculates each target scattering point, and then can realize the echo modulation intelligence that calculates in real time each target scattering point, thereby Real-time Obtaining Area Objects echoed signal, performance index with real-time testing synthetic-aperture radar.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of synthetic-aperture radar Area Objects Echo Signal Simulator of providing of the application; The process flow diagram of a kind of search method embodiment 1;
Fig. 2 is a kind of structural representation of the FPGA counter that provides of the application;
Fig. 3 is a kind of structural representation of the FPGA computing board that provides of the application;
Fig. 4 is a kind of structural representation of the dsp chip that provides of the application;
Fig. 5 is a kind of structural representation of the fpga chip that provides of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
An embodiment
Refer to Fig. 1, it shows the structural representation of a kind of synthetic-aperture radar Area Objects Echo Signal Simulator that the application provides, a kind of synthetic-aperture radar Area Objects Echo Signal Simulator that the application provides is applied to the testing performance index of synthetic-aperture radar, described synthetic-aperture radar Area Objects Echo Signal Simulator comprises: DSP (digital signal processing, Digital Signal Processing) plate 101, first memory 102, FPGA (field programmable gate array, Field-Programmable Gate Array) computing array 103, the first cumulative plate 104 and DRFM (digital radiofrequency memory, Digital Radio Frequency Memory) 105.
Dsp board 101, for calculating the radar site of described synthetic-aperture radar, the range of exposures of described synthetic-aperture radar and the calculation task of the echo modulation intelligence of the target scattering point in described range of exposures is divided into a plurality of calculating subtask is distributed to a plurality of FPGA computing boards in FPGA computing array 103.
Dsp board 101, for calculating the radar site of synthetic-aperture radar, and calculates the range of exposures of synthetic-aperture radar according to the radar site of synthetic-aperture radar.
Dsp board 101 is after calculating the range of exposures of synthetic-aperture radar, the calculation task of the echo modulation intelligence of the target scattering point in range of exposures is divided into a plurality of calculating subtask, a plurality of FPGA computing boards in FPGA computing array 103 are distributed to respectively in a plurality of calculating subtask, by each FPGA computing board, carry out one and calculate subtask, each calculates subtask correspondence and a plurality of target scattering points, visible, each FPGA computing board all calculates the echo modulation intelligence of a plurality of target scattering points, and each FPGA computing board takes the mode of parallel computation to calculate, than only carried out the calculation task of the echo modulation intelligence of the target scattering point in range of exposures by a FPGA computing board, speed is greatly improved.
First memory 102, for storing the scattering properties of each target scattering point in the range of exposures of described synthetic-aperture radar.
The scattering properties of each target scattering point is before synthetic-aperture radar Area Objects Echo Signal Simulator is started working, be stored in first memory 102, wherein, the scattering properties of each target scattering point is by model of place software for calculation, by ray tracking method, to be calculated the backscattering coefficient of target under different incidence angles degree, and emulation starts front according to the scattering coefficient of the calculation of parameter simulating area impact points such as trajectory message and carrier controlling antenna wave beam to point.
FPGA computing array 103, be connected with dsp board 101 with first memory 102, for distribute to the calculating subtask of each FPGA computing board based on described dsp board 101, according to the radar site of described synthetic-aperture radar and the scattering properties value of described each target scattering point, parallel computation goes out the echo modulation intelligence of each target scattering point.
In the present embodiment, FPGA computing array 103 comprises a plurality of FPGA computing boards, and as shown in Figure 2, shown in Fig. 2 is a kind of structural representation of the FPGA computing array 103 that provides of the application.Each FPGA computing board is at the synchronization echo modulation intelligence of a plurality of target scattering points of parallel computation separately.The calculating subtask that each FPGA computing board distributes according to dsp board 101, to calculating the echo modulation intelligence of target scattering point corresponding to subtask, calculate, and each FPGA computing board is in synchronization executed in parallel calculating subtask separately separately, each FPGA computing board is at the synchronization echo modulation intelligence of a plurality of target scattering points of parallel computation separately.
In the present embodiment, each FPGA computing board comprises fpga chip group and the first range gate modulation intelligence totalizer.Wherein: fpga chip group, for calculating the echo modulation intelligence of a plurality of target scattering points.Fpga chip group comprises the fpga chip of a plurality of pipeline organizations.A plurality of fpga chip concurrent workings, and each fpga chip adopts the method for operation of flowing water to calculate the echo modulation intelligence of target scattering point.
The first range gate modulation intelligence totalizer, is connected with fpga chip group, for the echo modulation intelligence of each fpga chip output of cumulative fpga chip group.
The structure of FPGA computing board can be referring to Fig. 3, and shown in Fig. 3 is a kind of structural representation of the FPGA computing board that provides of the application.In Fig. 3, by fpga chip 1, represent fpga chip group to fpga chip n.The first range gate modulation intelligence totalizer is connected with fpga chip 1 to each fpga chip in fpga chip n respectively.
Wherein, the number of the first range gate modulation intelligence totalizer is identical with the number of FPGA computing board.
The first cumulative plate 104, is connected with FPGA computing array 103, for the echo modulation intelligence of cumulative FPGA computing array 103 each FPGA computing boards, generates Area Objects echo modulation intelligence.
In the present embodiment, the first cumulative plate 104 can be realized by converging plate.
DRFM105, be connected with the first cumulative plate 104, for the radar signal of described Area Objects echo modulation intelligence and described synthetic-aperture radar is carried out to convolution algorithm, obtain Area Objects echoed signal, wherein said Area Objects echoed signal is for testing the performance index of described synthetic-aperture radar.
FPGA computing array 103 can parallel computation goes out the echo modulation intelligence of each target scattering point, shortened greatly the echo modulation intelligence time used of having calculated all target scattering points, improved the speed of the echo modulation intelligence that calculates each target scattering point, and then realization calculates the echo modulation intelligence of each target scattering point in real time, thereby Real-time Obtaining Area Objects echoed signal, with the performance index of real-time testing synthetic-aperture radar.
When the range of exposures of synthetic-aperture radar is larger, the number of the calculative target scattering point of synthetic-aperture radar Area Objects Echo Signal Simulator that the application provides is very many, although the number of calculative target scattering point is very many, but because the application is by dsp board and the combination of FPGA computing array, and FPGA computing array comprises a plurality of FPGA computing boards, each FPGA computing board is at the synchronization echo modulation intelligence of a plurality of target scattering points of parallel computation separately, make to have calculated in the short time at the utmost point echo modulation intelligence of all target scattering points, improved the speed of the echo modulation intelligence that calculates each target scattering point, thereby improved the speed of obtaining Area Objects echoed signal, and then performance index that can real-time testing synthetic-aperture radar.
In this application, utilize dsp board to calculate the radar site of described each repetition of synthetic-aperture radar, the range of exposures of described synthetic-aperture radar and the calculation task of each FPGA computing board in FPGA computing array is distributed, the calculation task of each FPGA computing board that FPGA computing array can distribute based on described dsp board, according to the radar site of described synthetic-aperture radar and the scattering properties value of described each target scattering point, parallel computation goes out the echo modulation intelligence of each target scattering point, shortened greatly the echo modulation intelligence time used of having calculated all target scattering points, improved the speed of the echo modulation intelligence that calculates each target scattering point, and then can realize the echo modulation intelligence that calculates in real time each target scattering point, thereby can realize Real-time Obtaining Area Objects echoed signal, performance index with real-time testing synthetic-aperture radar.
Another embodiment
Refer to Fig. 4, shown in the present embodiment is a kind of structural representation of dsp board 101, Fig. 4 shows a kind of structural representation of the dsp board that the application provides, and dsp board 101 comprises: radar site computing module 401, the first range of exposures counter 402 and task distribution module 403.
Radar site computing module 401, for calculating the radar site of described each repetition of synthetic-aperture radar.
The first range of exposures counter 402, for calculating the range of exposures of described synthetic-aperture radar.
Task distribution module 403, be connected with described the first range of exposures counter 402, the calculation task of the echo modulation intelligence of the target scattering point in described range of exposures is divided into a plurality of calculating subtask, distributes to the task distribution module that a plurality of FPGA computing boards calculate.
In the present embodiment, initial target scattering point is default target scattering point, the default initial point of conduct in scene corresponding to the range of exposures of synthetic-aperture radar.Each target scattering point in the range of exposures of each repetition of synthetic-aperture radar is in scene corresponding to the range of exposures of synthetic-aperture radar with respect to the relative position of initial target scattering point, and each target scattering point is with respect to line number and the row number of initial target scattering point.
Another embodiment
Refer to Fig. 5, shown in the present embodiment is the structural representation of fpga chip, shown in Fig. 5 is a kind of structural representation of the fpga chip that provides of the application, and fpga chip comprises: coordinate computing module 501, distance calculator 502, phase calculation module group 503, magnitude computation module group 504 and second distance door modulation intelligence totalizer 505.
Coordinate computing module 501, for according to the range of exposures of described synthetic-aperture radar and the origin coordinates in the whole simulating scenes of described synthetic-aperture radar region, calculates the coordinate of described each target scattering point in described whole simulating scenes region.
It should be noted that, the process of coordinate that the process of calculating the coordinate of each target scattering point in whole simulating scenes region is calculated target scattering point in prior art is identical, does not repeat them here.
Distance calculator 502, is connected with coordinate computing module 501, for according to the coordinate of described target scattering point and the coordinate of described synthetic-aperture radar, calculates the radial distance between described target scattering point and described synthetic-aperture radar.
In the present embodiment, the radar of the coordinate foundation described synthetic-aperture radar of described synthetic-aperture radar in described whole simulating scenes region is with respect to the location positioning of the default initial point of scene.
Phase calculation module group 503, is connected with distance calculator 502, puts the phase place of corresponding echo modulation intelligence for each target scattering of parallel computation.
In the present embodiment, phase calculation module group 503 comprises a plurality of phase calculation modules, the target scattering point of the corresponding default number of each phase calculation module, wherein, the numerical value of the default number that each phase calculation module is corresponding is adjusted according to the requirement of real-time of test synthetic-aperture radar, and each phase calculation module is calculated the target scattering of corresponding default number and put corresponding echo modulation intelligence phase place.(magnitude computation module group 504, is connected with coordinate computing module 501, puts the amplitude of corresponding echo modulation intelligence for each target scattering of parallel computation.
In the present embodiment, magnitude computation module group 504 comprises a plurality of magnitude computation module, the target scattering point of the corresponding default number of each magnitude computation module, wherein, the numerical value of the default number that each magnitude computation module is corresponding is adjusted according to the requirement of real-time of test synthetic-aperture radar, and the target scattering that each magnitude computation module is calculated its corresponding default number is put the amplitude of corresponding echo modulation intelligence.
Each magnitude computation module comprises: coordinate system converter, weighted calculation module and the first magnitude calculator.Wherein:
Coordinate system converter, be connected with coordinate computing module 501, for by described target scattering point, the coordinate conversion under geographic coordinate system is the coordinate under antenna coordinate system and the coordinate conversion under geographic coordinate system is the coordinate under antenna coordinate system by described synthetic-aperture radar.
Weighted calculation module, is connected with coordinate system converter, for the coordinate under antenna coordinate system and the described synthetic-aperture radar coordinate under antenna coordinate system according to described target scattering point, calculates the antenna radiation pattern weighted value of described synthetic-aperture radar.
The first magnitude calculator, is connected with weighted calculation module, for the antenna radiation pattern weighted value of described synthetic-aperture radar and the scattering properties of described target scattering point are multiplied each other, obtains the amplitude that described target scattering is put corresponding echoed signal.
Second distance door modulation intelligence totalizer 505, be connected with phase calculation module group 503, magnitude computation module group 504 and distance calculator 502, for putting according to each target scattering the range gate unit number that corresponding radial distance calculates each target scattering point, according to the phase place of each target scattering point and amplitude, calculate the echo modulation intelligence of each target scattering point, and the echo modulation intelligence of the identical target scattering point of range gate is added up, the echo modulation intelligence after being added up.
In the cumulative fpga chip group of the first range gate modulation intelligence totalizer, the echo modulation intelligence of each fpga chip output is the cumulative echo modulation intelligence of a plurality of the second modulation intelligence totalizers 505 in each fpga chip.
Wherein, the equidistant ring deterministic process of the function of the second modulation intelligence totalizer 505 in synthetic-aperture radar Area Objects Echo Signal Simulator in can the patent application document that be 201210353283.9 referring to application number, the process of the equivalent scattering coefficient of determining each rang ring of the function of second distance door modulation intelligence totalizer 505 in synthetic-aperture radar Area Objects Echo Signal Simulator in can the patent application document that be 201210353283.9 referring to the patent No..
Wherein, the first range gate modulation intelligence totalizer is connected with the first cumulative plate 104, and because each FPGA computing board all has a first range gate modulation intelligence totalizer, therefore, the first cumulative plate 104 can be connected with a plurality of the first range gate modulation intelligence totalizers.
In addition, synthetic-aperture radar Area Objects Echo Signal Simulator, on any one basis of Fig. 1 to Fig. 5, can also comprise: second memory, occlusion test module and the second magnitude calculator.Wherein:
Second memory, for storing the elevation fluctuating data of each target scattering point in the range of exposures of described synthetic-aperture radar.
Occlusion test module, processes for the elevation fluctuating data to described each target scattering point the block information that obtains each target scattering point.
Occlusion test module can be integrated in dsp board 101, can certainly individualism.When occlusion test module integration is during to dsp board 101, second memory is connected with dsp board 101, and when occlusion test module individualism, second memory is directly connected with occlusion test module.
The second magnitude calculator, for the block information of the scattering properties of the antenna radiation pattern weighted value of described synthetic-aperture radar, described target scattering point and described target scattering point is multiplied each other, obtains the amplitude that described target scattering is put corresponding echoed signal.
The target scattering that the second magnitude calculator calculates is put target scattering that the amplitude of corresponding echoed signal calculates than the first magnitude calculator and is put the amplitude of corresponding echoed signal and more approach the true amplitude that target scattering in real scene is put corresponding echoed signal.
The second magnitude calculator is in fpga chip, wherein, the second magnitude calculator can be integrated in a magnitude calculator with the first magnitude calculator, when integrated magnitude calculator is when being connected with occlusion test module, integrated magnitude calculator is used for the antenna radiation pattern weighted value of described synthetic-aperture radar, the scattering properties of described target scattering point and the block information of described target scattering point multiply each other, obtain described target scattering and put the amplitude of corresponding echoed signal, when integrated magnitude calculator is not connected with occlusion test module, for the antenna radiation pattern weighted value of described synthetic-aperture radar and the scattering properties of described target scattering point are multiplied each other, obtain described target scattering and put the amplitude of corresponding echoed signal.
Synthetic-aperture radar Area Objects Echo Signal Simulator can also comprise on the basis of Fig. 1: the second cumulative plate, carries out range ambiguity processing and power attenuation processing for the Area Objects echo modulation intelligence that the first cumulative plate 104 is generated.
The second cumulative plate is based on minimum delay information, the maximum-delay information of the range of exposures internal object scattering point of synthetic-aperture radar repetition and synthetic-aperture radar when target echo modulation intelligence carries out range ambiguity processing over there.
The second cumulative plate is based on radar equation principle when target echo modulation intelligence carries out power attenuation processing over there.
The second cumulative plate can be integrated in the first cumulative plate 104, and certainly, the second cumulative plate and the first cumulative plate 104 can be distinguished individualism.When the second cumulative plate is integrated in the first cumulative plate 104, the first cumulative plate 104 not only can generate Area Objects echo modulation intelligence, but also can carry out to the Area Objects echo modulation intelligence generating that range ambiguity is processed and power attenuation processing.When the second cumulative plate and the first cumulative plate 104 difference individualism, the second cumulative plate and the first cumulative plate 104 are connected.
In addition, synthetic-aperture radar Area Objects Echo Signal Simulator can also comprise on any one basis of Fig. 1 to Fig. 5: mass memory plate and the second range of exposures counter.Wherein:
Mass memory plate, is connected with described DRFM105, for Area Objects echoed signal described in real-time storage.The Area Objects echoed signal of mass memory plate real-time storage can be for carrying out the data analysis after simulated experiment.
The second range of exposures counter, calculates the number of the target scattering point in the range of exposures that do not overlap of described synthetic-aperture radar in two adjacent repetitions of described synthetic-aperture radar.
The second range of exposures counter can be integrated in dsp board 101, certainly, and also can individualism.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the utility model.To the multiple modification of these embodiment, be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the wide region consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a synthetic-aperture radar Area Objects Echo Signal Simulator, is applied to the testing performance index of synthetic-aperture radar, it is characterized in that, comprising:
Dsp board;
First memory;
With the FPGA computing array that described first memory is connected with described dsp board, described FPGA computing array comprises a plurality of FPGA computing boards;
The the first cumulative plate being connected with described FPGA computing array;
The digital radiofrequency memory DRFM being connected with the described first cumulative plate.
2. simulator according to claim 1, is characterized in that, described dsp board comprises:
For calculating the radar site computing module of the radar site of described each repetition of synthetic-aperture radar;
For calculating the first range of exposures counter of the range of exposures of described synthetic-aperture radar;
Be connected with described the first range of exposures counter, the calculation task of the echo modulation intelligence of the target scattering point in described range of exposures is divided into a plurality of calculating subtask, distribute to the task distribution module that a plurality of FPGA computing boards calculate.
3. simulator according to claim 2, is characterized in that, described FPGA computing board comprises:
For calculating the fpga chip group of the echo modulation intelligence of a plurality of target scattering points, described fpga chip group comprises the fpga chip of a plurality of pipeline organizations;
Be connected with described fpga chip group, the first range gate modulation intelligence totalizer of the echo modulation intelligence of exporting for cumulative each fpga chip of described fpga chip group;
Wherein said fpga chip comprises:
For according to the range of exposures of described synthetic-aperture radar and the origin coordinates in the whole simulating scenes of described synthetic-aperture radar region, calculate the coordinate computing module of the coordinate of described each target scattering point in described whole simulating scenes region;
Be connected with described coordinate computing module, for according to the coordinate of described target scattering point and the coordinate of described synthetic-aperture radar, calculate the distance calculator of the radial distance between described target scattering point and described synthetic-aperture radar;
Be connected with described distance calculator, for each target scattering of parallel computation, put the phase calculation module group of the phase place of corresponding echo modulation intelligence, described phase calculation module group comprises a plurality of phase calculation modules, the target scattering point of the corresponding default number of each phase calculation module;
Be connected with described coordinate computing module, for each target scattering of parallel computation, put the magnitude computation module group of the amplitude of corresponding echo modulation intelligence, described magnitude computation module group comprises a plurality of magnitude computation module, the target scattering point of the corresponding default number of each magnitude computation module;
Be connected with described distance calculator with described phase calculation module group, described magnitude computation module group, for putting according to each target scattering the range gate unit number that corresponding radial distance calculates each target scattering point, according to the phase place of each target scattering point and amplitude, calculate the echo modulation intelligence of each target scattering point, and the echo modulation intelligence of the identical target scattering point of range gate is added up, the second distance door modulation intelligence totalizer of the echo modulation intelligence after being added up.
4. simulator according to claim 3, is characterized in that, described magnitude computation module comprises:
Be connected with described coordinate computing module, for by described target scattering point, the coordinate conversion under geographic coordinate system is the coordinate under antenna coordinate system and the coordinate conversion under geographic coordinate system is the coordinate system converter of the coordinate under antenna coordinate system by described synthetic-aperture radar;
Be connected with described coordinate system converter, for the coordinate under antenna coordinate system and the described synthetic-aperture radar coordinate under antenna coordinate system according to described target scattering point, calculate the weighted calculation module of the antenna radiation pattern weighted value of described synthetic-aperture radar;
Be connected with described weighted calculation module, for the antenna radiation pattern weighted value of described synthetic-aperture radar and the scattering properties of described target scattering point are multiplied each other, obtain the first magnitude calculator that described target scattering is put the amplitude of corresponding echoed signal.
5. simulator according to claim 4, is characterized in that, also comprises:
For storing the second memory of the elevation fluctuating data of each target scattering point in the range of exposures of described synthetic-aperture radar.
6. simulator according to claim 5, is characterized in that, described dsp board also comprises:
For the elevation fluctuating data of described each target scattering point being processed to the occlusion test module of the block information that obtains each target scattering point.
7. simulator according to claim 6, it is characterized in that, also comprise: for the block information of the scattering properties of the antenna radiation pattern weighted value of described synthetic-aperture radar, described target scattering point and described target scattering point is multiplied each other, obtain the second magnitude calculator that described target scattering is put the amplitude of corresponding echo modulation intelligence.
8. simulator according to claim 1, is characterized in that, also comprises:
For described Area Objects echo modulation intelligence being carried out to the second cumulative plate that range ambiguity is processed and power attenuation is processed.
9. according to the simulator described in claim 1 to 8 any one, it is characterized in that, also comprise:
Be connected with described DRFM, for the mass memory plate of Area Objects echoed signal described in real-time storage;
For calculating the second range of exposures counter of the number of the target scattering point in the range of exposures that do not overlap of described synthetic-aperture radar in two adjacent repetitions of described synthetic-aperture radar.
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