CN109901165A - The simulator and analogy method of satellite-borne SAR echo - Google Patents
The simulator and analogy method of satellite-borne SAR echo Download PDFInfo
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Abstract
The present invention provides the simulators and analogy method of a kind of satellite-borne SAR echo, wherein the simulator of satellite-borne SAR echo includes: that external interface module, GPU echo computing module, echo data memory module and simulation parameter resolve module；The external interface module receives baseband transmission signal, the input of synchronous refernce clocks and PRF pulse, the simulation parameter resolves the satellite SAR simulation parameter information at satellite moment and user setting that module is inputted according to the external interface module, emulate the target scene of current PRF moment satellite antenna beam, the GPU echo computing module is according to the information of target scene, calculate the impulse response sequence of target scene, and it is input to external interface module, the external interface module carries out convolutional calculation to the impulse response sequence and baseband transmission signal of the target scene, obtain base band echo-signal, it is exported after saving to echo data memory module.According to the technical solution of the present invention, echo formation efficiency can be effectively improved.
Description
Technical field
The present invention relates to fields of communication technology, in particular to the simulator and a kind of star of a kind of satellite-borne SAR echo
Carry the analogy method of SAR echo.
Background technique
Satellite-borne synthetic aperture radar (Synthetic Aperture Radar, SAR) due to running on orbit space, not by
The limitation such as adverse weather condition, national boundaries territorial sky, has round-the-clock, all weather operations and the advantage being imaged on a large scale.For spaceborne
SAR technical research, the received echo-signal of radar is with key effect --- radar echo signal is with containing the attitude of satellite, star
The influence of space geometry, radar system parameters, atmospheric environment etc. can refer to Spaceborne SAR System parameter, imaging algorithm, performance
Mark etc. is detected, by computer simulation echo-signal, not only flexibly, efficiently, but also cost of implementation relative moderate, therefore,
It is used widely.
Satellite-borne SAR analogue echoes have high-precision, the demand of low real-time and the huge problem of calculation amount, due to imaging
The operand magnanimity of the fining of scene process, raw radar data simulation increases, and at the end PC, consuming time is long for emulation, emulation
Inefficiency is difficult to meet per second hundred billion floating-point operations and the high speed of hundred billion byte datas processing in engineering research and wants in real time
It asks, respectively has deficiency using the processing of the hardware platforms such as CPU, DSP, FPGA in the related technology, the formation efficiency of echo is relatively low, to this mesh
Preceding effective solution not yet.
Summary of the invention
The present invention is based at least one above-mentioned technical problem, proposes a kind of simulation side of new satellite-borne SAR echo
Case can be effectively improved echo formation efficiency.
In view of this, the invention proposes a kind of simulators of new satellite-borne SAR echo, comprising: external interface module,
GPU echo computing module, echo data memory module and simulation parameter resolve module；Wherein, the external interface module receives
The input of baseband transmission signal, synchronous refernce clocks and PRF pulse, the simulation parameter resolve module according to the external interface
The satellite moment of module input and the satellite SAR simulation parameter information of user setting, emulate current PRF moment satellite antenna wave
The target scene of beam irradiation, the GPU echo computing module calculate the impulse response of target scene according to the information of target scene
Sequence, and it is input to external interface module, impulse response sequence and base of the external interface module to the target scene
Band transmitting signal carries out convolutional calculation, obtains base band echo-signal, exports after saving to echo data memory module.
In any of the above-described technical solution, it is preferable that the GPU echo computing module is using described in GPU platform calculating
The impulse response sequence of target scene.
In any of the above-described technical solution, it is preferable that the satellite SAR simulation parameter information of the user setting includes wave
Position parameter and orbit parameter.
According to the second aspect of the invention, propose it is a kind of any one of based on the above-mentioned technical proposal described in satellite-borne SAR
The analogue echoes method of the simulator of echo, comprising: the system operating path of user's input is obtained by human-computer interaction interface；
When getting the system operating path, the satellite SAR of human-computer interaction interface input is read by control operation class ECHO_GPU
Simulation parameter information, and start the CSetting class that simulation parameter resolves module, the satellite SAR simulation parameter information is passed
Transport to CSetting class；It can be controlled and be started by ECHO_GPU class in the CSetting class that the simulation parameter resolves module, and
Receive the simulation parameter that the transmitting of ECHO_GPU class comes；Based on the pre-defined algorithm and radar wave position parameter encapsulated in CSetting class
Initialization process was carried out with radar operation mode, to obtain the pass under different working modes between beam area and different scenes
System；The CEchoProce class of GPU echo computing module and external interface module is according to the incidence relation determination and target scene
Beam area, and GPU core function and one-dimensional frequency domain method are called, according to the baseband transmission signal of external interface module input, same
Reference clock and PRF pulse are walked, the echo-signal of each arteries and veins is generated；It is generated based on CFileOpt class object for saving echo letter
The file of the configuration file of number file and input/output argument.
In the above-mentioned technical solutions, it is preferable that the system operating path includes that document scene transfers path and echo letter
Number output storing path, wherein the document scene transfer path stored file define this simulation target scene.
In the above-mentioned technical solutions, it is preferable that the file is CFileOpt class object in the system operating path
The file of lower generation named with current time.
By above technical scheme, echo formation efficiency can be effectively improved.
Detailed description of the invention
What Fig. 1 showed the simulator of the satellite-borne SAR echo of embodiment according to the present invention shows block diagram；
Fig. 2 shows the flow diagrams of the analogy method of satellite-borne SAR echo according to an embodiment of the invention；
Fig. 3 shows the flow diagram of the analogy method of satellite-borne SAR echo according to another embodiment of the invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Below in conjunction with Fig. 1 to Fig. 3, technical scheme is described further:
What Fig. 1 showed the simulator of the satellite-borne SAR echo of embodiment according to the present invention shows block diagram.
As shown in Figure 1, the simulator 100 of the satellite-borne SAR echo of embodiment according to the present invention, comprising: external interface
Module 102, GPU echo computing module 104, echo data memory module 106 and simulation parameter resolve module 108.
Wherein, external interface module 102 receives the input of baseband transmission signal, synchronous refernce clocks and PRF pulse, emulation
The satellite SAR simulation parameter at the satellite moment and user setting that parameter calculation module 108 is inputted according to external interface module 102 is believed
Breath emulates the target scene of current PRF moment satellite antenna beam, and GPU echo computing module 104 is according to target scene
Information, calculate the impulse response sequence of target scene, and be input to external interface module 102, external interface module 102 is right
The impulse response sequence and baseband transmission signal of target scene carry out convolutional calculation, obtain base band echo-signal, extremely return saving
It is exported after wave data memory module 106.
Further, GPU echo computing module 104 calculates the impulse response sequence of target scene using GPU platform.
Further, the satellite SAR simulation parameter information of user setting includes wave position parameter and orbit parameter.
Specifically, based on the analogy method of the device, as shown in Fig. 2, specifically including:
Step S202 obtains the system operating path of user's input by human-computer interaction interface.System operating path includes scene
File transfers the storing path in path and echo-signal output, wherein document scene transfers path stored file and defines this
The target scene of secondary simulation.
Step S204 reads human-computer interaction interface by control operation class ECHO_GPU when getting system operating path
The satellite SAR simulation parameter information of input, and start the CSetting class that simulation parameter resolves module, satellite SAR is emulated
Parameter information is transmitted to CSetting class.
Step S206 can be controlled by ECHO_GPU class in the CSetting class that simulation parameter resolves module and be started, and be connect
The simulation parameter come by the transmitting of ECHO_GPU class.
Step S208, based on the pre-defined algorithm and radar wave position parameter that are encapsulated in CSetting class and radar operation mode
Initialization process was carried out, to obtain the relationship under different working modes between beam area and different scenes.
The CEchoProce class of step S210, GPU echo computing module and external interface module is determined according to incidence relation
With the beam area of target scene, and GPU core function and one-dimensional frequency domain method are called, is sent out according to the base band of external interface module input
Signal, synchronous refernce clocks and PRF pulse are penetrated, the echo-signal of each arteries and veins is generated.
Step S212 is generated based on CFileOpt class object for saving matching for echo-signal file and input/output argument
Set the file of file.File is the text named with current time that CFileOpt class object generates under system operating path
Part folder.
Point target simulated radar echo is the basis of SAR echo signal simulation, and Area Objects are exactly to be divided at regular intervals
Simulated radar echo is carried out at point target one by one, passes through the analysis of the imaging effect to point target, it can be determined that face
The image quality of target.Below by taking point target simulated radar echo as an example, in conjunction with Fig. 3, technical solution of the present invention is done into one
Step explanation:
In the present embodiment, analogy method is completed by four classes, respectively control operation class ECHO_GPU, file operation class
CFileOpt, GPU handle class CEchoProce and intermediate data calculates class CSetting；ECHO_GPU class control when specific implementation
The operation of CFileOpt class, CSetting class and CEchoProce class processed, and data transmitting is carried out to CFileOpt class；
The mutual transmitting of data is carried out between CFileOpt class and CSetting class, CEchoProce class carries out data to CFileOpt class
Transmitting, detailed process the following steps are included:
Step 1: passing through human-computer interaction interface input system operating path --- document scene transfers path and echo-signal output
Storing path, the defined position in this path, that is, echo data memory module, wherein document scene transfers path stored file
The target scene of this time simulation is defined, is a point target, is located at scene center point position, the amplitude value of target point is
1, phase value is 0；
Step 2: after the definition of system operating path is completed, by control operation class ECHO_GPU reading machine interactive interface input
User setting simulation parameter, including wave position parameter and orbit parameter；
Wherein, beam parameters include: sample rate be 21MHz, pulse recurrence frequency i.e. PRF is 1488Hz, pulse width 25us,
Signal bandwidth is 17.4MHz, sampling number 4153, be 4.32 degree apart from beam angle, azimuth beamwidth is 0.55 degree, thunder
It is standard band mode up to operating mode；
Orbit parameter includes: that semi-major axis is 6883.5km, and eccentricity 0.001, orbit inclination angle is 97.44 degree, argument of perigee
It is 90 degree, right ascension of ascending node is 88.617 degree, and time of perigee passage is current time；
Step 3: after wave position parameter and orbit parameter are provided with, the CSetting class that simulation parameter resolves module can be by
ECHO_GPU class controls and starts, and receives the simulation parameter that the transmitting of ECHO_GPU class comes, and utilizes what is encapsulated in CSetting class
Satellite orbital position calculating, coordinate system conversion, beam position point and beam region scheduling algorithm, in conjunction with the radar wave position of setting
Parameter and radar operation mode, CSetting class object will do it the calculating of correlation module, that is, initialized, and obtain corresponding work
The correlativity of beam area and scene under operation mode calculates standby data accurately for echo meter；
Step 4: the target field that the CEchoProce class of GPU echo computing module and external interface module can be generated according to emulation
The relevant beam area relationship of scape calls GPU core function and one-dimensional frequency domain method, the baseband transmission inputted according to external interface module
Signal, synchronous refernce clocks and PRF pulse, generate the echo-signal of each arteries and veins；
Step 5: CFileOpt class object can generate currently under the operating path that step 1 defines after echo signal form
The file of time name, the interior file saved of file have the configuration file of echo-signal file and input/output argument, side
Just echo play signal is called；
Step 6: the echo-signal that satellite-borne SAR echo simulation device generates calls echo play signal by external interface module
Output completes other signal processings to other equipment, completes the process of entire satellite-borne SAR analogue echoes.
Compared with prior art, the application has the advantages that
1.GPU have it is high can concurrency, powerful floating-point operation ability, the signal data volume of satellite-borne SAR analogue echoes is huge, and
And many processing links there are natural concurrency accelerate that 100 or so speed-up ratio can be reached using GPU；
2. the language is modification on the basis of C language using realizing that the GPGPU language CUDA of GPU general-purpose computations is developed
And extension, complicated figure mathematic(al) function is encapsulated, realization details hard to understand is concealed, reduces GPU exploitation door
Sill；
3. simulator framework is simple, hardware implementation cost is low, while can increase and decrease GPU platform quantity according to demand, realizes and uses
Family customization；
4. the analogue echoes under different mode and parameter can be realized, usability is wide.
It is merely a preferred embodiment of the present invention, is not intended to restrict the invention, for the technology of this field described in upper
For personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of simulator of satellite-borne SAR echo characterized by comprising
External interface module, GPU echo computing module, echo data memory module and simulation parameter resolve module；
Wherein, the external interface module receives the input of baseband transmission signal, synchronous refernce clocks and PRF pulse, described imitative
The satellite SAR simulation parameter at the satellite moment and user setting that true parameter calculation module is inputted according to the external interface module is believed
Breath emulates the target scene of current PRF moment satellite antenna beam, and the GPU echo computing module is according to target scene
Information, calculate the impulse response sequence of target scene, and be input to external interface module, the external interface module is to institute
The impulse response sequence and baseband transmission signal for stating target scene carry out convolutional calculation, obtain base band echo-signal, are saving extremely
It is exported after echo data memory module.
2. the simulator of satellite-borne SAR echo according to claim 1, which is characterized in that the GPU echo computing module
The impulse response sequence of the target scene is calculated using GPU platform.
3. the simulator of satellite-borne SAR echo according to claim 1 or 2, which is characterized in that the user setting is defended
Star SAR simulation parameter information includes wave position parameter and orbit parameter.
4. a kind of analogy method of satellite-borne SAR echo, the mould based on satellite-borne SAR echo described in any one of claims 1 to 3
The analogue echoes method of quasi- device characterized by comprising
The system operating path of user's input is obtained by human-computer interaction interface；
When getting the system operating path, the satellite of human-computer interaction interface input is read by control operation class ECHO_GPU
SAR simulation parameter information, and start the CSetting class that simulation parameter resolves module, the satellite SAR simulation parameter is believed
Breath is transmitted to CSetting class；
It can be controlled and be started by ECHO_GPU class in the CSetting class that the simulation parameter resolves module, and receive ECHO_GPU
The simulation parameter that class transmitting comes；
Initialization was carried out based on the pre-defined algorithm and radar wave position parameter that encapsulate in CSetting class and radar operation mode
Processing, to obtain the relationship under different working modes between beam area and different scenes；
The CEchoProce class of GPU echo computing module and external interface module is according to the incidence relation determination and target scene
Beam area, and GPU core function and one-dimensional frequency domain method are called, according to the baseband transmission signal of external interface module input, same
Reference clock and PRF pulse are walked, the echo-signal of each arteries and veins is generated；
The file for saving the configuration file of echo-signal file and input/output argument is generated based on CFileOpt class object
Folder.
5. the analogy method of satellite-borne SAR echo according to claim 4, which is characterized in that the system operating path packet
Include the storing path that document scene transfers path and echo-signal output, wherein the document scene transfers the stored text in path
Part defines the target scene of this simulation.
6. the analogy method of satellite-borne SAR echo according to claim 4, which is characterized in that the file is
The file named with current time that CFileOpt class object generates under the system operating path.
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| CN111025246A (en) * | 2019-11-28 | 2020-04-17 | 北京遥测技术研究所 | Simulation system and method for composite scene imaging of sea surface and ship by using stationary orbit SAR |
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| CN114252855B (en) * | 2022-03-01 | 2022-05-06 | 南京雷电信息技术有限公司 | Simultaneous SAR/GMT echo simulation method and system thereof |
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