CN110068804A - Echo simulation method and system based on Sparse Array - Google Patents
Echo simulation method and system based on Sparse Array Download PDFInfo
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- CN110068804A CN110068804A CN201910461509.9A CN201910461509A CN110068804A CN 110068804 A CN110068804 A CN 110068804A CN 201910461509 A CN201910461509 A CN 201910461509A CN 110068804 A CN110068804 A CN 110068804A
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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
- G01S13/904—SAR modes
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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
-
- 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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of echo simulation method and system based on Sparse Array, by the number segmentation object large scene according to aerial array channel in control information and Sparse Array component, and calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation.It is tested the radar emission signal that synthetic aperture radar SAR is sent by aerial array channel reception, obtains a baseband signal；The modulation intelligence of corresponding sub-goal scene is calculated according to each impulse response range gate information；For each sub-goal scene, echo information is calculated according to baseband signal and corresponding modulation intelligence；The echo information being calculated correspondence is fed back into each aerial array channel, each radiofrequency signal obtained after processing is sent to SAR；The compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation can be completed by the above method, realize the fidelity purpose for improving the SAR radar simulation under target large scene.
Description
Technical field
The present invention relates to simulation technical fields, and in particular to a kind of echo simulation method and system based on Sparse Array.
Background technique
With the development of society, the progress of science, synthetic aperture radar (Synthetic Aperture Radar, SAR)
Echo simulation has become the important tests means of SAR various functions verifying.Specifically, SAR echo simulation is to carry out the side SAR
When the work such as case design, image-processing algorithms verifying, system testing and system preliminary identification, set by SAR echo signal emulation
It is standby to simulate the radar return that SAR is obtained in practical flight, test is carried out to SAR and performance indicator is verified.
SAR echo signal emulator is mainly made of control terminal and receiving end, its working principle is that control terminal receives thunder
Up to the control information of replicating machine, and the object model data and antenna direction diagram data downloaded in advance are combined, according to different scatterings
The difference operation of point oblique distance, obtains Area Objects echo modulation information, by Area Objects echo modulation information and radar emission signal into
Row processing obtains echo-signal, and echo-signal is finally transmitted to SAR by an antenna and is corrected.
In the prior art, SAR echo signal emulator is when the echo-signal to small size scene emulates, due to
The spatial information variation of small size scene is small, therefore can be ignored, and still, carries out in the echo-signal to large scene wide viewing angle
When emulation, due to SAR echo signal emulator default SAR be irradiated to the echo of each beam direction in ground from a point it is anti-
It is emitted back towards SAR, and actually echo is issued from the scattering point of scene all directions.Therefore, to the echo of large scene wide viewing angle
When signal is emulated, mesh can be led to because the echo that default is irradiated to each beam direction in ground returns SAR from a point reflection
Target space angle information is lost, so that the contextual data distortion that SAR echo signal emulator emulates is serious.
Summary of the invention
The present invention provides a kind of echo simulation method and system based on Sparse Array is improved with realizing in target large scene
The fidelity purpose of lower SAR radar simulation.
In order to achieve the above objectives, the present invention provides the following technical scheme that
First aspect present invention discloses a kind of echo simulation method based on Sparse Array, comprising:
According to the number segmentation object large scene in aerial array channel in control information and Sparse Array component, and calculate segmentation
The acquired corresponding impulse response range gate information of multiple sub-goal scenes, the sub-goal scene and the aerial array
Channel corresponds；
It is tested the radar emission signal that synthetic aperture radar SAR is sent by the aerial array channel reception, obtains one
A baseband signal；
The modulation intelligence of the corresponding sub-goal scene is calculated according to each impulse response range gate information；
For each sub-goal scene, echo information is calculated according to the baseband signal and corresponding modulation intelligence；
Each of the echo information being calculated correspondence is fed back into each aerial array channel, will be obtained after processing
Radiofrequency signal is sent to SAR；Wherein, each echo information is obtained the radio frequency of a focusing after the processing of the aerial array channel
Signal.
Optionally, the number segmentation object large scene according to aerial array channel in control information and Sparse Array component, and
Calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by dividing, comprising:
The number for obtaining the control information and the aerial array channel, the target large scene is divided into described more
A sub- target scene；
It is calculated and each sub-goal scene according to the control information, antenna radiation pattern and the target large scene
One-to-one impulse response range gate information.
Optionally, the modulation intelligence of the corresponding sub-goal scene is calculated according to each impulse response range gate information,
Include:
Obtain the corresponding sub-goal scene information of the multiple sub-goal scene；
The corresponding sub-goal scene information of each sub-goal scene and impulse response range gate information are imported and corresponded to
Baseband board card；
In each baseband board card, the impulse response range gate information based on importing to the sub-goal scene information of importing into
Row signal modulation process obtains the modulation intelligence for corresponding to the sub-goal scene；
Correspondingly, being directed to each sub-goal scene, calculated back according to the baseband signal and corresponding modulation intelligence
Wave information, comprising:
For each sub-goal scene, the modulation of the correspondence sub-goal scene is believed in corresponding baseband board card
Breath and the baseband signal carry out process of convolution, obtain the echo information for corresponding to the sub-goal scene.
Optionally, the echo information being calculated correspondence is fed back into each aerial array channel, will be obtained after processing
To each radiofrequency signal be sent to SAR, comprising:
The echo information being calculated correspondence is fed back into each aerial array channel；
Each aerial array channel carries out digital-to-analogue conversion and upconversion process, and benefit to received echo information
Width is carried out with the echo information after upconversion process with the conversion of predetermined width phase change code table logarithmic mode mutually to adjust, and obtains one
The radiofrequency signal of a focusing；Wherein, the width phase change code table is that wave beam algorithm model is precalculated according to the control information
It obtains；
Obtained each radiofrequency signal is sent to SAR.
Optionally, each aerial array channel carries out at digital-to-analogue conversion and up-conversion received echo information
Reason, and carry out width with the echo information after upconversion process using the conversion of predetermined width phase change code table logarithmic mode and mutually adjust
It is whole, obtain the radiofrequency signal of a focusing, comprising:
Each aerial array channel carries out digital-to-analogue conversion to received echo information, obtains corresponding simulation letter
Number；
Each aerial array channel carries out up-conversion to obtained analog signal using the channel instruction frequency of input；
Width corresponding with the control information is determined from the width phase change code table in each aerial array channel
Phase change control word carries out width to the analog signal after up-conversion using the width phase change control word and mutually adjusts, obtains one
The radiofrequency signal of focusing, the control information change with the variation of the SAR moving scene emulated.
Second aspect of the present invention discloses a kind of echo simulation system based on Sparse Array, comprising: control equipment and sparse
Battle array component；The control equipment includes control unit and Base Band Unit, and the Sparse Array component includes mutiple antennas array channel；
Described control unit controls the number segmentation object large scene of information and the aerial array channel for foundation,
And calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation, the sub-goal scene and institute
State aerial array channel one-to-one correspondence；Each impulse response range gate information being calculated is sent to the Base Band Unit；
The Base Band Unit, for being tested the thunder that synthetic aperture radar SAR is sent by the aerial array channel reception
Up to transmitting signal, a baseband signal is obtained；According to from the received each impulse response range gate information meter of the Base Band Unit
Calculate the modulation intelligence of the corresponding sub-goal scene；For each sub-goal scene, according to the baseband signal and right
The modulation intelligence answered calculates echo information；And the echo information being calculated correspondence is fed back into each aerial array and is led to
Road；
The Sparse Array component for handling the echo information received from the Base Band Unit, and will obtain after processing
Each radiofrequency signal be sent to SAR；Wherein, each echo information is obtained a focusing after the processing of the aerial array channel
Radiofrequency signal.
Optionally, described control unit is specifically used for: the number of the control information and the aerial array channel is obtained,
The target large scene is divided into the multiple sub-goal scene；According to the control information, antenna radiation pattern and the mesh
Mark large scene is calculated and each one-to-one impulse response range gate information of sub-goal scene；It is each by what is be calculated
Impulse response range gate information is sent to the Base Band Unit.
Optionally, the Base Band Unit includes multiple baseband board cards, and baseband board card and the sub-goal scene correspond；
Described control unit is specifically used for: the number segmentation according to aerial array channel in control information and Sparse Array component
Target large scene, and calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation；Obtain institute
State the corresponding sub-goal scene information of multiple sub-goal scenes；By the corresponding sub-goal scene of each sub-goal scene
Information and impulse response range gate information import corresponding baseband board card；
The Base Band Unit is specifically used for: in each baseband board card, the impulse response range gate information pair based on importing
The sub-goal scene information of importing carries out signal modulation process, obtains the modulation intelligence for corresponding to the sub-goal scene；For every
A sub-goal scene believes the modulation intelligence of the correspondence sub-goal scene and the base band in corresponding baseband board card
Number carry out process of convolution, obtain the echo information for corresponding to the sub-goal scene；By the corresponding feedback of the echo information being calculated
To each aerial array channel.
Optionally, the Sparse Array component is specifically used for using each aerial array channel to received echo
Information carries out digital-to-analogue conversion and upconversion process, and utilizes at the conversion of predetermined width phase change code table logarithmic mode and up-conversion
Echo information after reason carries out width and mutually adjusts, and obtains the radiofrequency signal of a focusing, obtained each radiofrequency signal is sent to
SAR；Wherein, the width phase change code table is that wave beam algorithm model precalculates to obtain according to the control information.
Optionally, the Sparse Array component includes: multichannel digital-to-analogue DA board and multichannel frequency-variable module, multichannel digital-to-analogue
Channel in DA board and multichannel frequency-variable module corresponds, and each aerial array channel includes that a pair has corresponding relationship
Multichannel digital-to-analogue DA board and multichannel frequency-variable module in channel；
Each channel carries out digital-to-analogue conversion to received echo information in multichannel digital-to-analogue DA board, and digital-to-analogue is turned
The analog signal obtained after changing inputs the corresponding channel in the multichannel frequency-variable module；
Each channel carries out obtained analog signal using the channel instruction frequency of input in multichannel frequency-variable module
Frequency conversion；Width phase change control word corresponding with the control information is determined in each channel from the width phase change code table, benefit
Width is carried out to the analog signal after up-conversion with the width phase change control word mutually to adjust, and obtains the radiofrequency signal of a focusing；
Obtained radiofrequency signal is sent to SAR by each channel；The control information becomes with the variation of the SAR moving scene emulated
Change.
The invention discloses one kind be based on Sparse Array echo simulation method and system, this method pass through according to control information and
The number segmentation object large scene in aerial array channel in Sparse Array component, and it is each to calculate multiple sub-goal scenes obtained by segmentation
Self-corresponding impulse response range gate information.Wherein, sub-goal scene and aerial array channel correspond；Pass through aerial array
Channel reception is tested the radar emission signal that synthetic aperture radar SAR is sent, and obtains a baseband signal；It is rung according to each pulse
Range gate information is answered to calculate the modulation intelligence of corresponding sub-goal scene；For each sub-goal scene, according to baseband signal and
Corresponding modulation intelligence calculates echo information；The echo information being calculated correspondence is fed back into each aerial array channel, it will
The each radiofrequency signal obtained after processing is sent to SAR；Wherein, each echo information is obtained one after the processing of aerial array channel
The radiofrequency signal of a focusing.Target large scene can be divided into multiple sub-goal scenes by the above method, and corresponded to
The echo information of the different spaces angle of multiple sub-goal scenes, and each echo information is handled in aerial array channel
To the radiofrequency signal of focusing, the compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation is completed,
Realize the fidelity purpose for improving the SAR radar simulation under target large scene.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of echo simulation system structure diagram based on Sparse Array provided in an embodiment of the present invention；
Fig. 2 is another echo simulation method flow chart based on Sparse Array provided in an embodiment of the present invention；
Fig. 3 is another echo simulation method flow chart based on Sparse Array provided in an embodiment of the present invention；
Fig. 4 is another echo simulation method flow chart based on Sparse Array provided in an embodiment of the present invention；
Fig. 5 is another echo simulation method flow chart based on Sparse Array provided in an embodiment of the present invention；
Fig. 6 is another echo simulation method flow chart based on Sparse Array provided in an embodiment of the present invention；
Fig. 7 is a kind of echo simulation system structure diagram based on Sparse Array provided in an embodiment of the present invention；
Fig. 8 is another echo simulation system structure diagram based on Sparse Array provided in an embodiment of the present invention；
Fig. 9 is another echo simulation system structure diagram based on Sparse Array provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of echo simulation method and system based on Sparse Array, by the way that target large scene to be divided into
Multiple sub-goal scenes, and obtain corresponding to the echo information of the different spaces angle of multiple sub-goal scenes, the echo that will be obtained
Information correspondence feeds back to each aerial array channel, and each radiofrequency signal obtained after handling in aerial array channel is sent
To SAR, the compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation is completed, realizes and improves in mesh
Mark the fidelity purpose of SAR radar simulation under large scene.Specific implementation process is illustrated with the following examples.
As shown in Figure 1, being a kind of structural representation of the echo simulation system based on Sparse Array disclosed by the embodiments of the present invention
Figure, the echo simulation system include: control equipment 110 and Sparse Array component 120.Wherein, control equipment 110 is echo simulation
The control terminal of system, Sparse Array component 120 are the receiving end of echo simulation system.
Controlling equipment 110 includes: digital signal processor (digital signal processor, DSP) and 37 bases
Band board 111.Digital signal processor is the control unit controlled in equipment 110, and 37 baseband board cards are in control equipment 110
Base Band Unit.
37 baseband board cards 111 are connected with DSP.It include AD conversion module, field-programmable in each baseband board card 111
Array (Field-Programmable Gate Array, FPGA) and digital radiofrequency memory (digaital radio
Frequency memory, DRFM).
Sparse Array component 120 includes: 37 channel digital-to-analogue conversions (Digital to Analog, DA) board 121,37 channels
Frequency-variable module 122, radio-frequency head 123 and spherical surface screen antenna array 130.
37 channel of baseband board card 111 and 37 DA boards 121 are connected, specific connection type are as follows: a baseband board card 111 is corresponding
It is connected with the channel in 37 channel DA boards 121.Each channel of the 37 channel DA board 121 is correspondingly arranged a digital-to-analogue and turns
Parallel operation.
The 37 channel frequency-variable modules 122 of channel DA board 121 and 37 are connected.Specific connection type are as follows: 37 channel DA boards 121
In a channel be correspondingly connected with the channel in 37 channel frequency-variable modules 122.
That is, having 37 aerial array channels in the Sparse Array component 120 altogether.Wherein, each aerial array is logical
Road includes a pair of channel having in the multichannel digital-to-analogue DA board and multichannel frequency-variable module of corresponding relationship.
37 channel frequency-variable modules 122 are connected with radio-frequency head 123.
Radio-frequency head 123 is connected with spherical surface screen antenna array 130, which is Sparse Array antenna array.The spherical surface
37 transceivers are provided on screen antenna array 130.That is, the corresponding aerial array channel of each transceiver.Actually answering
In, the radius of curvature of spherical surface screen can be determined according to the characteristics of target large scene and SAR itself.
Wherein, the number of the transceiver being arranged on the spherical surface screen antenna array 130,37 channel frequency-variable modules 122 port number,
The port number of 37 channel DA boards 121 and the baseband board card number of 37 baseband board cards 111 are identical.
That is, the echo simulation system is specifically using the multichannel frequency converter and multichannel DA plate with how many channel
The port number in card aerial array channel needed for being tested SAR determines.
It should be noted that radio-frequency head 123 with spherical surface screen antenna array 130 is connected by 37 channels, indicated in Fig. 1
For ch1, ch2, ch3 ... ch37.
It is imitative based on echo disclosed above for wait emulate or be tested SAR during implementing emulation
True system is believed for the echo of multiple and different space angles of each sub-goal scene feedback obtained after segmentation object large scene
Breath, distributes corresponding FPGA and DRFM, and obtain modulated echo information, then modulated to each of different spaces angle
Echo information carries out digital-to-analogue conversion and frequency conversion, retransmits to wait emulate or be tested SAR and is synthesized, and exists to obtain tested SAR
Echo simulation information under target large scene.Wherein, in practical applications, division (the i.e. sub-goal scene of specific space angle
Segmentation) scene specifically simulated according to the resolution ratio and target large scene of SAR determines.
It should be understood that channel number, baseband board card etc. are designed as 37, in reality in specific embodiment shown in Fig. 1
In, the quantity of channel number, baseband board card etc. is not limited to 37.Spherical surface screen antenna array also only preferably designs,
In practical application, spherical surface screen antenna array may be other kinds of aerial array, for example planar antenna battle array etc..
In addition, can be by receiving end in hardware design to adapt to the emulation of different scenes, different synthetic aperture radar
Antenna, frequency-variable module, D/A converter module etc. are designed as expansible design, convenient to change the logical of aerial array according to actual needs
Road number.When receiving end uses expansible design, for the change for adapting to aerial array channel number, a baseband board card may
Need to correspond to more than one aerial array channel, so needing to import or select according to actual needs difference in software algorithm
Allocation strategy.It is easily understood that when receiving end uses expansible design, the quantity of baseband board card and aerial array channel
Data may not be one-to-one, but the quantity of sub-goal scene and the quantity in aerial array channel must be corresponded
's.
Based on echo simulation system disclosed in aforementioned present invention, as shown in Fig. 2, being a kind of base provided in an embodiment of the present invention
In the flow chart of the echo simulation method of Sparse Array, this method comprises the following steps:
Step S201: the number segmentation object large scene in aerial array channel in foundation control information and Sparse Array component,
And calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation.
In step s 201, based on system disclosed in above-mentioned Fig. 1 it is found that being arranged on the spherical surface screen antenna array of tested SAR
There are multiple transceivers, complete in order to collect the echo information in big target scene, therefore, it is necessary to sub-goal scene and antenna arrays
Channel is arranged to correspond.
Control information refer to carrier positions, bearer rate, wavelength direction, wavelength, polarization mode, target range speed and
The information such as emulation command.Carrier is particularly for the aircraft for carrying tested SAR.
Impulse response range gate information specifically includes the information such as delay, width phase and phase.
Step S201 is executed based on DSP disclosed in embodiments of the present invention Fig. 1.Specific implementation procedure as shown in figure 3,
The following steps are included:
Step S301: the number of control information and aerial array channel is obtained, target large scene is divided into multiple specific items
Mark scene.
In step S301, needs first to pre-process the control information got, obtain pretreated information, it should
Information is specifically handled as suitable for the digital information emulated.It should be noted that the control information obtains in real time.
During implementing step S301, based on determining control information, it can determine that tested SAR and target are big
Location information between scene.Under position between determining tested SAR and target large scene, it can determine tested SAR's
Beam range.It therefore, can be by being tested the beam range of SAR and the number in aerial array channel to the big field of target
Scape is split, and obtains multiple sub-goal scenes.
Step S302: according to the control information, antenna radiation pattern and target large scene be calculated and each sub-goal scene one
One corresponding impulse response range gate information.
In step s 302, antenna radiation pattern refers at a certain distance from from antenna, and the relative field strength of radiation field is with direction
The figure of variation, generalling use through two orthogonal plane patterns in antenna greatest irradiation direction indicates.
During implementing step S302, pass through determining control information combination antenna radiation pattern and the big field of target
The information of scape is calculated, and the one-to-one impulse response range gate information of each sub-goal scene is obtained.
In embodiments of the present invention, impulse response range gate information includes delay, width phase and phase etc., it is not limited to
This.
Step S202: the radar emission signal that synthetic aperture radar SAR is sent is tested by aerial array channel reception, is obtained
To a baseband signal.
In step S202, based on the motor pattern of tested SAR, in analogue system, pass through aerial array channel reception
To the radar emission signal for being tested SAR and sending to target large scene is simulated, a baseband signal can be generated, which will
It as input signal, is input in the corresponding baseband board card of each sub-goal scene, in the subsequent each sub-goal scene of calculating
It is used when echo-signal (i.e. echo information).
In the concrete realization, being tested SAR reality to the process that target scene sends radar signal and generates beam information is
It is moved relative to target scene.In analogue system, by simulating tested SAR under beam scanning situation, target field
The target echo in the complicated face in scape is rotated with the angle change of electric scanning, thus simulate over time and present
Two-dimentional echo angle change.Here electric scanning is realized by controlling the real-time change of Sparse Array width phase.
Step S203: the modulation intelligence of corresponding sub-goal scene is calculated according to each impulse response range gate information.
In step S203, during executing step S201, the multiple sub-goal scenes determined are corresponding
Impulse response range gate information calculates the modulation intelligence of corresponding sub-goal scene, in order to the subsequent echo for calculating sub-goal scene
It is used when information.
Step S204: being directed to each sub-goal scene, calculates echo information according to baseband signal and corresponding modulation intelligence.
It, will corresponding son in corresponding baseband board card for each sub-goal scene during executing step S204
The modulation intelligence and baseband signal of target scene carry out process of convolution, obtain the echo information of corresponding sub-goal scene.Namely
It says, each baseband board card handles a modulation intelligence and a baseband signal, obtains corresponding to the modulation intelligence and base
The echo information of the sub-goal scene of band signal.
The system in conjunction with disclosed in attached drawing 1, the baseband board card are the baseband board card in echo simulation system shown in fig. 1.It should
It include FPGA and DRFM in baseband board card.Believed in baseband board card based on the wave beam of AD conversion module, FPGA and DRFM to importing
Breath and corresponding sub-goal scene information are handled.Specifically, the baseband signal for importing same baseband board card is carried out modulus
Baseband signal and modulation intelligence progress convolution after obtained analog-to-digital conversion is obtained the echo of corresponding sub-goal scene by conversion
Information.
Step S205: the echo information being calculated correspondence is fed back into each aerial array channel, will be obtained after processing
Each radiofrequency signal be sent to SAR.
In step S205, each echo information obtains the radiofrequency signal of a focusing after being handled by aerial array channel.
It should be noted that SAR is more by what is obtained after executing step S205 and each radiofrequency signal is sent to SAR
A radiofrequency signal is weighted, the available echo-signal for having space angle information.
The process for implementing step S205, as shown in figure 4, specifically comprising the following steps:
Step S401: the echo information being calculated correspondence is fed back into each aerial array channel.
Step S402: each aerial array channel carries out at digital-to-analogue conversion and up-conversion received echo information
Reason, and carry out width with the echo information after upconversion process using the conversion of predetermined width phase change code table logarithmic mode and mutually adjust
It is whole, obtain the radiofrequency signal of a focusing.
The specific process for executing step S402, as shown in figure 5, including the following steps:
Step S501: each aerial array channel carries out digital-to-analogue conversion to received echo information, obtains corresponding
Analog signal.
The system in conjunction with disclosed in attached drawing 1, during executing step S501, each channel in multichannel DA board is defeated
Enter an echo information, and digital-to-analogue conversion is carried out to the echo information received, obtained analog signal is sent to multichannel and is become
Frequency module.
Step S502: each aerial array channel carries out obtained analog signal using the channel instruction frequency of input
Frequency conversion.
In step S502, the channel instruction frequency inputted in aerial array channel is obtained from control information.
During executing step S502, because the frequency of the analog signal received by multichannel DA board is unsatisfactory for
It is required that therefore, based on respectively simulation of the corresponding channel instruction inputted to receiving of each channel in multichannel frequency-variable module
Signal carries out upconversion process, obtains corresponding radiofrequency signal.
Step S503: width phase transformation corresponding with control information is determined from width phase change code table in each aerial array channel
Change control word, width is carried out to the analog signal after up-conversion using width phase change control word and is mutually adjusted, obtains penetrating for a focusing
Frequency signal.
In step S503, control information changes with the variation of the SAR moving scene emulated.
During specific implementation, the generation of width phase change code table can consider wave beam variation range, stepping, beam position essence
The parameters such as degree, wave beam reduction degree.Usual wave beam variation range is -3~3 degree of degree, and stepping is 0.01 degree.
The real-time control process of width phase change code table is with certain precision, and by microwave control panel, real time down is led to each
In the frequency-variable module in road, the real-time control to analog signal width phase can be completed, to realize compression and the antenna of beam angle
The scanning in direction.
For example, the system in conjunction with disclosed in attached drawing 1, in the concrete realization, the real-time control process of width phase change code table with
The precision of 10us in the frequency-variable module of real time down to each channel, can be completed to 37 aerial arrays by microwave control panel
The real-time control of analog signal width phase in channel, to realize the compression of beam angle and the scanning of antenna direction.
In practical applications, width phase change code table can be pre-generated in host computer, and is imported into microwave control panel.
Step S403: obtained each radiofrequency signal is sent to SAR.
The invention discloses a kind of echo simulation method and system based on Sparse Array, by according to controlling information and sparse
The number segmentation object large scene in aerial array channel in battle array component, and it is respectively right to calculate multiple sub-goal scenes obtained by segmentation
The impulse response range gate information answered.The radar emission that synthetic aperture radar SAR is sent is tested by aerial array channel reception
Signal obtains a baseband signal；The modulation letter of corresponding sub-goal scene is calculated according to each impulse response range gate information
Breath；For each sub-goal scene, echo information is calculated according to baseband signal and corresponding modulation intelligence；It is returned what is be calculated
Wave information correspondence feeds back to each aerial array channel, and each radiofrequency signal obtained after processing is sent to SAR；By above-mentioned
Method can complete the compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation, realize and improve
The fidelity purpose of SAR radar simulation under target large scene.
With reference to Fig. 6, for another echo simulation method based on Sparse Array provided in an embodiment of the present invention, this method includes
Following steps:
Step S601: the number segmentation object large scene in aerial array channel in foundation control information and Sparse Array component,
And calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation.
Step S602: the radar emission signal that synthetic aperture radar SAR is sent is tested by aerial array channel reception, is obtained
To a baseband signal.
It should be noted that the implementation principle and specific implementation procedure of step S601 and step S602 and as shown in Figure 2
The implementation principle and specific implementation procedure of step S201 and step S202 is identical, reference can be made to above-mentioned corresponding description, here no longer into
Row repeats.
Step S603: the corresponding sub-goal scene information of multiple sub-goal scenes is obtained.
Step S604: the corresponding sub-goal scene information of each sub-goal scene and impulse response range gate information are imported
Corresponding baseband board card.
The system in conjunction with disclosed in attached drawing 1, the relevant information of each one sub- target scene of baseband board card alignment processing.Cause
This, during executing step S604, by the corresponding sub-goal scene information of each sub-goal scene and impulse response distance
Door information imports in corresponding baseband board card.
Step S605: in each baseband board card, sub-goal of the impulse response range gate information based on importing to importing
Scene information carries out signal modulation process, obtains the modulation intelligence of corresponding sub-goal scene.
Based on the impulse response range gate information that above-mentioned execution step S604 is imported, step S605 is executed, in each base band
In board, the impulse response range gate information based on importing carries out signal modulation process to the sub-goal scene information of importing, can
To obtain the modulation intelligence of corresponding sub-goal scene.
Step S606: being directed to each sub-goal scene, by the modulation of corresponding sub-goal scene in corresponding baseband board card
Information and baseband signal carry out process of convolution, obtain the echo information of corresponding sub-goal scene.
Step S607: the echo information being calculated correspondence is fed back into each aerial array channel, will be obtained after processing
Each radiofrequency signal be sent to SAR.
It should be noted that the implementation principle and specific implementation procedure of step S606 and step S607 and as shown in Figure 2
Step 204 is identical with the implementation principle of step S205 and specific implementation procedure, reference can be made to above-mentioned corresponding description, no longer carries out here
It repeats.
The invention discloses a kind of echo simulation method and system based on Sparse Array, by according to controlling information and sparse
The number segmentation object large scene in aerial array channel in battle array component, and it is respectively right to calculate multiple sub-goal scenes obtained by segmentation
The impulse response range gate information answered.The radar emission that synthetic aperture radar SAR is sent is tested by aerial array channel reception
Signal obtains a baseband signal；The modulation letter of corresponding sub-goal scene is calculated according to each impulse response range gate information
Breath；For each sub-goal scene, echo information is calculated according to baseband signal and corresponding modulation intelligence；It is returned what is be calculated
Wave information correspondence feeds back to each aerial array channel, and each radiofrequency signal obtained after processing is sent to SAR；By above-mentioned
Method can complete the compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation, realize and improve
The fidelity purpose of SAR radar simulation under target large scene.
Corresponding with the echo simulation method based on Sparse Array that foregoing invention provides, the present invention also provides corresponding bases
In the echo simulation system of Sparse Array, as shown in fig. 7, be a kind of echo simulation system based on Sparse Array disclosed by the invention,
The echo simulation system based on Sparse Array includes:
Control equipment 710 and Sparse Array component 720；The control equipment 710 includes control unit 711 and Base Band Unit
712, the Sparse Array component 720 includes mutiple antennas array channel 721.
Described control unit 711 is big for the number segmentation object according to control information and the aerial array channel 721
Scene, and calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation, the sub-goal field
Scape and the aerial array channel correspond, and each impulse response range gate information being calculated is sent to the base band list
Member；
The Base Band Unit 712, for receiving tested synthetic aperture radar SAR hair by the aerial array channel 721
The radar emission signal sent obtains a baseband signal, according to from the received each impulse response distance of the Base Band Unit 712
Door information calculates the modulation intelligence of the corresponding sub-goal scene, for each sub-goal scene, according to the base band
Signal and corresponding modulation intelligence calculate echo information, and the echo information being calculated correspondence is fed back to each antenna
Array channel 721；
The Sparse Array component 720, for handling the echo information received from the Base Band Unit 712, and will processing
The each radiofrequency signal obtained afterwards is sent to SAR；Wherein, each echo information is obtained after the processing of the aerial array channel 721
The radiofrequency signal focused to one.
Optionally, described control unit 711 is specifically used for: obtaining the control information and the aerial array channel 721
Number, the target large scene is divided into the multiple sub-goal scene；According to the control information, antenna radiation pattern and
The target large scene is calculated and each one-to-one impulse response range gate information of sub-goal scene；It will calculate
To each impulse response range gate information be sent to the Base Band Unit 712.
Optionally, as shown in figure 8, the Base Band Unit 712 include multiple baseband board cards 801, baseband board card 801 with it is described
Sub-goal scene corresponds；
Described control unit 711 is specifically used for: according to aerial array channel 721 in control information and Sparse Array component
Number segmentation object large scene, and calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation；
Obtain the corresponding sub-goal scene information of the multiple sub-goal scene；By the corresponding specific item of each sub-goal scene
It marks scene information and impulse response range gate information imports corresponding baseband board card；
The Base Band Unit 712 is specifically used for: in each baseband board card, the impulse response range gate information based on importing
Signal modulation process is carried out to the sub-goal scene information of importing, obtains the modulation intelligence for corresponding to the sub-goal scene；For
Each sub-goal scene, by the modulation intelligence of the correspondence sub-goal scene and the base band in corresponding baseband board card
Signal carries out process of convolution, obtains the echo information for corresponding to the sub-goal scene；The echo information being calculated is corresponding anti-
It feeds each aerial array channel.
Optionally, the Sparse Array component 720 is specifically used for using each aerial array channel 721 to received
Echo information carry out digital-to-analogue conversion and upconversion process, and using the conversion of predetermined width phase change code table logarithmic mode and on
Echo information after frequency-conversion processing carries out width and mutually adjusts, and obtains the radiofrequency signal of a focusing, each radiofrequency signal that will be obtained
It is sent to SAR；Wherein, the width phase change code table is that wave beam algorithm model precalculates to obtain according to the control information.
Optionally, as shown in figure 9, the Sparse Array component 720 includes: that multichannel digital-to-analogue DA board 901 and multichannel become
Frequency module 902, the channel in multichannel digital-to-analogue DA board 901 and multichannel frequency-variable module 902 correspond, each antenna
Array channel 721 includes that a pair has leading in the multichannel digital-to-analogue DA board 901 and multichannel frequency-variable module 902 of corresponding relationship
Road；
Each channel carries out digital-to-analogue conversion to received echo information in multichannel digital-to-analogue DA board 901, and will count
The analog signal obtained after mould conversion inputs the corresponding channel in the multichannel frequency-variable module 902；
Each channel carries out obtained analog signal using the channel instruction frequency of input in multichannel frequency-variable module 902
Up-conversion；Width phase change control word corresponding with the control information is determined in each channel from the width phase change code table,
Width is carried out to the analog signal after up-conversion using the width phase change control word mutually to adjust, and obtains the radio frequency letter of a focusing
Number；Obtained radiofrequency signal is sent to SAR by each channel；The information that controls is with the variation of the SAR moving scene emulated
And change.Referring to the discussion of previous embodiment, each channel needs the association of microwave control panel when obtaining width phase change control word
It helps, is that each width phase change control word is issued in corresponding channel by microwave control panel in other words.
It should be noted that in embodiments of the present invention, the structure of Sparse Array component 720 disclosed in Fig. 9 can also be with Fig. 1
Disclosed Sparse Array component 120 is identical, including corresponding radio-frequency head and spherical surface screen antenna array.
It should be noted that each unit and mould in the echo simulation system based on Sparse Array disclosed in aforementioned present invention
The specific principle of block and implementation procedure, it is identical as the echo simulation method disclosed in the embodiments of the present invention based on Sparse Array,
It can be found in corresponding portion in the echo simulation method based on Sparse Array disclosed in the embodiments of the present invention, no longer go to live in the household of one's in-laws on getting married here
It states.
The invention discloses a kind of echo simulation method and system based on Sparse Array, by according to controlling information and sparse
The number segmentation object large scene in aerial array channel in battle array component, and it is respectively right to calculate multiple sub-goal scenes obtained by segmentation
The impulse response range gate information answered.The radar emission that synthetic aperture radar SAR is sent is tested by aerial array channel reception
Signal obtains a baseband signal；The modulation letter of corresponding sub-goal scene is calculated according to each impulse response range gate information
Breath；For each sub-goal scene, echo information is calculated according to baseband signal and corresponding modulation intelligence；It is returned what is be calculated
Wave information correspondence feeds back to each aerial array channel, and each radiofrequency signal obtained after processing is sent to SAR；By above-mentioned
Method can complete the compensation of the object space loss of learning caused by conventional synthesis aperture radar echo simulation, realize and improve
The fidelity purpose of SAR radar simulation under target large scene.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including element.
The above is only a specific embodiment of the invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of echo simulation method based on Sparse Array characterized by comprising
According to the number segmentation object large scene in aerial array channel in control information and Sparse Array component, and calculate segmentation gained
To the corresponding impulse response range gate information of multiple sub-goal scenes, the sub-goal scene and the aerial array channel
It corresponds；
It is tested the radar emission signal that synthetic aperture radar SAR is sent by the aerial array channel reception, obtains a base
Band signal；
The modulation intelligence of the corresponding sub-goal scene is calculated according to each impulse response range gate information；
For each sub-goal scene, echo information is calculated according to the baseband signal and corresponding modulation intelligence；
The echo information being calculated correspondence is fed back into each aerial array channel, each radio frequency that will be obtained after processing
Signal is sent to SAR；Wherein, each echo information is believed by the radio frequency for obtaining a focusing after the processing of the aerial array channel
Number.
2. the method according to claim 1, wherein logical according to aerial array in control information and Sparse Array component
The number segmentation object large scene in road, and calculate multiple corresponding impulse response range gates of sub-goal scene obtained by segmentation
Information, comprising:
The number for obtaining the control information and the aerial array channel, is divided into the multiple son for the target large scene
Target scene；
It is calculated with each sub-goal scene one by one according to the control information, antenna radiation pattern and the target large scene
Corresponding impulse response range gate information.
3. the method according to claim 1, wherein being calculated according to each impulse response range gate information corresponding
The modulation intelligence of the sub-goal scene, comprising:
Obtain the corresponding sub-goal scene information of the multiple sub-goal scene；
The corresponding sub-goal scene information of each sub-goal scene and impulse response range gate information are imported into corresponding base
Band board；
In each baseband board card, the impulse response range gate information based on importing carries out letter to the sub-goal scene information of importing
Number modulation treatment, obtains the modulation intelligence for corresponding to the sub-goal scene；
Correspondingly, being directed to each sub-goal scene, echo letter is calculated according to the baseband signal and corresponding modulation intelligence
Breath, comprising:
For each sub-goal scene, in corresponding baseband board card by the modulation intelligence of the correspondence sub-goal scene and
The baseband signal carries out process of convolution, obtains the echo information for corresponding to the sub-goal scene.
4. the method according to claim 1, wherein the echo information being calculated correspondence is fed back to each institute
Aerial array channel is stated, each radiofrequency signal obtained after processing is sent to SAR, comprising:
The echo information being calculated correspondence is fed back into each aerial array channel；
Each aerial array channel carries out digital-to-analogue conversion and upconversion process to received echo information, and using in advance
First determining width phase change code table logarithmic mode conversion carries out width with the echo information after upconversion process and mutually adjusts, and obtains one and gathers
Burnt radiofrequency signal；Wherein, the width phase change code table is that wave beam algorithm model precalculates to obtain according to the control information
's；
Obtained each radiofrequency signal is sent to SAR.
5. according to the method described in claim 4, it is characterized in that, each aerial array channel is to received echo
Information carries out digital-to-analogue conversion and upconversion process, and utilizes at the conversion of predetermined width phase change code table logarithmic mode and up-conversion
Echo information after reason carries out width and mutually adjusts, and obtains the radiofrequency signal of a focusing, comprising:
Each aerial array channel carries out digital-to-analogue conversion to received echo information, obtains corresponding analog signal；
Each aerial array channel carries out up-conversion to obtained analog signal using the channel instruction frequency of input；
Width phase transformation corresponding with the control information is determined from the width phase change code table in each aerial array channel
Change control word, width is carried out to the analog signal after up-conversion using the width phase change control word and is mutually adjusted, obtains a focusing
Radiofrequency signal, the control information changes with the variation of the SAR moving scene emulated.
6. a kind of echo simulation system based on Sparse Array characterized by comprising control equipment and Sparse Array component；It is described
Controlling equipment includes control unit and Base Band Unit, and the Sparse Array component includes mutiple antennas array channel；
Described control unit for the number segmentation object large scene according to control information and the aerial array channel, and is counted
Acquired multiple corresponding impulse response range gate information of sub-goal scene, the sub-goal scene and the day are cut in point counting
Linear array channel corresponds；Each impulse response range gate information being calculated is sent to the Base Band Unit；
The Base Band Unit is sent out for being tested the radar that synthetic aperture radar SAR is sent by the aerial array channel reception
Signal is penetrated, a baseband signal is obtained；It is calculated pair according to from the received each impulse response range gate information of the Base Band Unit
The modulation intelligence for the sub-goal scene answered；For each sub-goal scene, according to the baseband signal and corresponding
Modulation intelligence calculates echo information；And the echo information being calculated correspondence is fed back into each aerial array channel；
The Sparse Array component, it is every for handling the echo information received from the Base Band Unit, and by what is obtained after processing
A radiofrequency signal is sent to SAR；Wherein, each echo information is obtained penetrating for a focusing after the processing of the aerial array channel
Frequency signal.
7. system according to claim 6, which is characterized in that described control unit is specifically used for: obtaining the control letter
The number of breath and the aerial array channel, is divided into the multiple sub-goal scene for the target large scene；According to described
Control information, antenna radiation pattern and the target large scene are calculated to be rung with each one-to-one pulse of sub-goal scene
Answer range gate information；Each impulse response range gate information being calculated is sent to the Base Band Unit.
8. system according to claim 6, which is characterized in that the Base Band Unit includes multiple baseband board cards, baseband board
Card is corresponded with the sub-goal scene；
Described control unit is specifically used for: the number segmentation object according to aerial array channel in control information and Sparse Array component
Large scene, and calculate multiple corresponding impulse response range gate information of sub-goal scene obtained by segmentation；It obtains described more
A corresponding sub-goal scene information of sub- target scene；By the corresponding sub-goal scene information of each sub-goal scene
Corresponding baseband board card is imported with impulse response range gate information；
The Base Band Unit is specifically used for: in each baseband board card, the impulse response range gate information based on importing is to importing
Sub-goal scene information carry out signal modulation process, obtain the modulation intelligence for corresponding to the sub-goal scene；For each institute
State sub-goal scene, in corresponding baseband board card by the modulation intelligence of the correspondence sub-goal scene and the baseband signal into
Row process of convolution obtains the echo information for corresponding to the sub-goal scene；The echo information being calculated is corresponded to and is fed back to respectively
A aerial array channel.
9. system according to claim 6, which is characterized in that the Sparse Array component is specifically used for utilizing each day
Linear array channel carries out digital-to-analogue conversion and upconversion process to received echo information, and utilizes predetermined width phase transformation
Change the conversion of code table logarithmic mode mutually to adjust with the echo information progress width after upconversion process, obtain the radiofrequency signal of a focusing,
Obtained each radiofrequency signal is sent to SAR；Wherein, the width phase change code table is wave beam algorithm model according to the control
What information precalculated.
10. system according to claim 9, which is characterized in that the Sparse Array component includes: multichannel digital-to-analogue DA board
With multichannel frequency-variable module, the channel in multichannel digital-to-analogue DA board and multichannel frequency-variable module is corresponded, each day
Linear array channel includes a pair of channel having in the multichannel digital-to-analogue DA board and multichannel frequency-variable module of corresponding relationship；
Each channel carries out digital-to-analogue conversion to received echo information in multichannel digital-to-analogue DA board, and will be after digital-to-analogue conversion
Obtained analog signal inputs the corresponding channel in the multichannel frequency-variable module；
Each channel carries out up-conversion to obtained analog signal using the channel instruction frequency of input in multichannel frequency-variable module；
Width phase change control word corresponding with the control information is determined in each channel from the width phase change code table, using described
Width phase change control word carries out width to the analog signal after up-conversion and mutually adjusts, and obtains the radiofrequency signal of a focusing；It is each logical
Obtained radiofrequency signal is sent to SAR by road；The control information changes with the variation of the SAR moving scene emulated.
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