CN109917388A - Biradical synthetic aperture radar phase synchronization method, device, equipment and storage medium - Google Patents
Biradical synthetic aperture radar phase synchronization method, device, equipment and storage medium Download PDFInfo
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Abstract
A kind of biradical synthetic aperture radar phase synchronization method based on encoded signal, applied to Radar Technology field, include: the echo-signal of the radar signal generation of the first SAR transmitting by the first SAR and the 2nd SAR while receiving, obtains the first echo received signal and the second echo received signal；First SAR receives the phase synchronized signal sent by the 2nd SAR, obtains the first synchronous reception signal；2nd SAR receives the phase synchronized signal sent by the first SAR, obtains the second synchronous reception signal；It determines that the first synchronous reception signal and the second synchronous peak phase for receiving signal are poor, and is determined according to peak phase difference using the first preset rules and compensate phase；According to compensation phase, phase compensation is carried out to the second echo received signal.The invention also discloses a kind of biradical synthetic aperture radar phase synchronous device based on encoded signal can be avoided and interrupt normal radar work, and then improves the working efficiency of radar.
Description
Technical field
The present invention relates to Radar Technology field more particularly to a kind of biradical synthetic aperture radar phases based on encoded signal
Synchronous method, device, electronic equipment and storage medium.
Background technique
Synthetic aperture radar (Synthetic Aperture Radar, SAR) is a kind of active microwave imaging radar, it
It may be mounted on the flying platforms such as aircraft, satellite, guided missile.Due to SAR can round-the-clock, it is round-the-clock implement to observe, and
With certain ground penetrating ability, therefore, SAR is in disaster monitoring, resource exploration, marine monitoring, environmental monitoring, mapping and army
Thing scouting etc. has unique advantage using upper.
Compared with monostatic radar, the particular arrangement of bistatic radar bistatic, which makes it have, configures flexible, acquisition letter
Breath is abundant, anti-the advantages that intercepting, is anti-interference, these advantages and application prospect make bistatic radar in recent years increasingly by
To favor.Double-base SAR system is a kind of new important radar system, and the system more that radar is mounted in formation flight defend
On star, constitute bistatic radar system, it is common complete wide swath high-resolution imaging, terrian elevation measurement, ocean current test the speed and
The tasks such as ground moving target monitoring；Double Satellite emits signal by primary, and auxiliary star receives signal realization simultaneously.But due to
Major-minor star uses different crystal oscillators, thus it is possible, on the one hand, can have the phase error introduced due to crystal oscillation frequency error in orientation
And it accumulates at any time；It on the other hand, cannot be as offset low-frequency phase in the case of single station since transmitting, receiving phase noise are uncorrelated
It makes an uproar component, the echo domain phase error of the asynchronous generation of phase will affect imaging and focusing and interferometric phase precision.
Summary of the invention
The main purpose of the present invention is to provide a kind of biradical synthetic aperture radar Phase synchronization side based on encoded signal
Method, device, electronic equipment and storage medium send phase using transmitting radar signal and the time slot for receiving radar echo signal
Bit synchronization signal receives radar echo signal and Phase synchronization in the initial time for receiving the echo window of radar echo signal simultaneously
Signal is able to achieve the Phase synchronization of echo-signal in Double Satellite's SAR system, improves image quality.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of biradical synthetic aperture based on encoded signal
Radar phase synchronization method, comprising:
First synthetic aperture radar receives the first phase synchronization signal sent by the second synthetic aperture radar, obtains first
Synchronous to receive signal, it is synchronous that second synthetic aperture radar receives the second phase sent by first synthetic aperture radar
Signal obtains the second synchronous reception signal；
Determine that the described first synchronous peak phase for receiving signal reception signal synchronous with described second is poor, and according to described
Peak phase difference determines compensation phase using the first preset rules；
According to the compensation phase, phase compensation is carried out to second echo received signal.
Second aspect of the embodiment of the present invention provides a kind of biradical synthetic aperture radar Phase synchronization dress based on encoded signal
It sets, comprising:
It is synchronous to receive the first phase sent by the second synthetic aperture radar for the first synthetic aperture radar for receiving module
Signal obtains the first synchronous reception signal, and second synthetic aperture radar is received to be sent by first synthetic aperture radar
Second phase synchronization signal, obtain second and synchronous receive signal；
Determining module, for determining the described first synchronous peak phase for receiving signal reception signal synchronous with described second
Difference, and compensation phase is determined using the first preset rules according to the peak phase difference；
Compensating module, for carrying out phase compensation to second echo received signal according to the compensation phase.
The third aspect of the embodiment of the present invention provides a kind of electronic equipment, comprising:
Memory, processor and storage are on a memory and the computer program that can run on a processor, feature exist
In the processor realizes the biradical conjunction based on encoded signal that first aspect of the embodiment of the present invention provides when executing described program
At aperture radar phase synchronization method.
Fourth aspect of the embodiment of the present invention provides a kind of computer readable storage medium, is stored thereon with computer journey
Sequence realizes that first aspect of the embodiment of the present invention is provided double based on encoded signal when the computer program is executed by processor
Base synthetic aperture radar phase synchronization method.
From the embodiments of the present invention it is found that the biradical synthetic aperture radar phase provided by the invention based on encoded signal
Synchronous method, device, electronic equipment and storage medium, the reception of the first synthetic aperture radar are sent by the second synthetic aperture radar
First phase synchronization signal, obtains the first synchronous reception signal, and the second synthetic aperture radar is received by the first synthetic aperture radar
The second phase synchronization signal of transmission, obtain second it is synchronous receive signal, determine that the first synchronous signal and second that receives is synchronized and connect
Collect mail number peak phase it is poor, and according to peak phase difference using the first preset rules determine compensation phase, according to compensation phase,
Phase compensation is carried out to the second echo received signal, can be avoided interrupt normal radar work in this way, and then improve radar
Working efficiency.Due to receiving phase synchronization signal while receives echo-signal, the flexibility of system design is increased.
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
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the biradical synthetic aperture radar phase synchronization method based on encoded signal that one embodiment of the invention provides
Flow diagram；
Fig. 2 be another embodiment of the present invention provides the biradical synthetic aperture radar phase synchronization method based on encoded signal
Flow diagram；
Fig. 3 is the biradical synthetic aperture radar phase synchronization method based on encoded signal that further embodiment of this invention provides
Flow diagram；
Fig. 4 is the structural schematic diagram for the double star SAR system that further embodiment of this invention provides；
Fig. 5 is the timing diagram of primary and auxiliary star receiving and transmitting signal that further embodiment of this invention provides；
Fig. 6 is the implementation process schematic diagram for the Phase synchronization compensation that further embodiment of this invention provides；
Fig. 7 is the biradical synthetic aperture radar phase synchronous device based on encoded signal that yet another embodiment of the invention provides
Structural schematic diagram；
Fig. 8 shows the hardware structure diagram of a kind of electronic equipment.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
In embodiments of the present invention, the 2nd SAR receives the second phase synchronization signal sent by the first SAR, obtains second
Synchronous to receive signal, the first SAR receives the first phase synchronization signal sent by the 2nd SAR, obtains the first synchronous reception signal,
It determines that the first synchronous reception signal and the second synchronous peak phase for receiving signal are poor, and uses first according to the peak phase difference
Preset rules determine compensation phase, and according to the compensation phase, the radar signal by the first SAR transmitting received to the 2nd SAR is produced
Raw echo-signal carries out phase compensation.
Referring to Fig. 1, Fig. 1 is the flow diagram of method that one embodiment of the invention provides, this method mainly include with
Lower step:
S101, the pulse width for determining first phase synchronization signal and second phase synchronization signal and emit the first phase
The initial time of synchronization signal and second phase synchronization signal；
Wherein, the initial time of the first phase synchronization signal and second phase synchronization signal is respectively positioned on positioned at radar signal
Free time except the echo samples window of launch time section and echo-signal.
In the present embodiment, pulse width is the duration of pulse, generally with microsecond (μ s) for unit.If first
The distance between SAR and the 2nd SAR farther out when, in order to increase the intensity of synchronization signal, need using wider pulse width, such as
When the distance between fruit the first SAR and the 2nd SAR is closer, relatively narrow pulse width can be used.
When being respectively positioned on radar signal due to the initial time of first phase synchronization signal and second phase synchronization signal
Between free time except the echo samples window of section and echo-signal, then, in order to guarantee that the first SAR and the 2nd SAR can be received
The pulse width of the phase synchronized signal emitted to other side, phase synchronized signal was needed according to pulse-recurrence time, each pulse
The distance between vacant duration and the first SAR and the 2nd SAR in repetition time determine.
S102, emitted according to the first SAR of the pulse width and initial time of second phase synchronization signal control to the 2nd SAR
Second phase synchronization signal.
In the present embodiment, second phase synchronization signal is the encoded signal orthogonal with radar signal, and second phase is synchronous
The carrier frequency of signal and the carrier frequency of radar signal are identical.In this way, can simplify phase synchronized signal when system design
Transceiver setting, thus reduce system design complexity.Simultaneously as the carrier frequency and radar of second phase synchronization signal
The carrier frequency of signal be it is identical, do not need the synchrodata of acquisition proportionally transforming to radar frequency size and carry out phase again
Compensation, so that compensation result is more accurate.
S103, the first SAR receives echo-signal, obtain the first echo received signal, and first echo signal constitutes first and connects
The collection of letters number.
First echo received signal is the echo-signal that the received radar signal by the first SAR transmitting of the first SAR generates.
S104, the 2nd SAR receives echo-signal obtain the second echo received signal, and it is synchronous that the 2nd SAR receives second phase
Signal obtains second phase synchronization signal, and the second echo received signal and second phase synchronization signal collectively form the second reception letter
Number.
In the present embodiment, the radar signal of the first SAR transmitting is the linear FM signal of negative frequency modulation.Second echo reception letter
Number with second phase synchronization signal together constitute the second reception signal.Due to the second echo received signal and the second synchronous reception
Signal in orthogonal, therefore the second echo can be minimized when the synchronous peak phase for receiving signal of carry out second extracts and connect
It is synchronous can to minimize second when carrying out the imaging of the second echo received signal for influence of the collection of letters number to peak phase
Receive influence of the signal to imaging.First echo received signal and the second synchronous signal that receives share an echo reception time
Window can increase the flexibility of system design.
S105, it is sent out according to the 2nd SAR of the pulse library width and initial time of first phase synchronization signal control to the first SAR
Penetrate first phase synchronization signal.
S106, the first SAR receives echo-signal obtain the first echo received signal, and it is synchronous that the first SAR receives first phase
Signal obtains the first synchronous reception signal, and the first echo received signal reception signal synchronous with first collectively forms the first reception letter
Number.
Identical as second phase synchronization signal in the present embodiment, first phase synchronization signal is orthogonal with radar signal
Encoded signal, and the carrier frequency of first phase synchronization signal and the carrier frequency of radar signal are also identical.
S107, the 2nd SAR receives echo-signal obtain the second echo received signal, and second echo signal constitutes second and receives
Signal.
S108, the received according to the first SAR the first synchronous peak phase for receiving signal received and the 2nd SAR
The synchronous peak phase for receiving signal of two SAR, determines compensation phase.
During realizing S108, it can be the peak phase of first phase synchronization signal letter synchronous with second phase
Number peak phase subtract each other to obtain difference, then the difference is obtained into compensation phase divided by 2.
S109, phase compensation is synchronized to received second echo received signal of the 2nd SAR according to the compensation phase.
In the present embodiment, since the operating mode of Double Satellite's SAR system is double war modes: the first SAR emits radar letter
Number, the first SAR and the 2nd SAR receive radar signal.In this operating mode, then it only needs to defend to not emitting radar signal
The radar signal that star receives carries out Phase synchronization compensation, i.e., only needs to carry out phase compensation to the second echo received signal.
In other embodiments of the present invention, before step 103, this method further include: obtain the carrier frequency of radar signal；Root
Second phase synchronization signal is determined according to the carrier frequency of the pulse width of second phase synchronization signal, initial time and radar signal,
Wherein, the carrier frequency of second phase synchronization signal and the carrier frequency of radar signal are identical.In the present embodiment, it is being determined that second phase is same
After the pulse width, initial time, carrier frequency that walk signal, then second phase synchronization signal is assured that.
In other embodiments of the present invention, before step 106, this method further include: wide according to the pulse of first phase
Degree, initial time and radar signal carrier frequency determine first phase synchronization signal, wherein the carrier frequency of first phase synchronization signal with
The carrier frequency of radar signal is identical.
In other embodiments of the present invention, before step 108, this method further include: determine the first SAR is received first
The synchronous peak phase for receiving signal；Determine the 2nd SAR is received second synchronous peak phase for receiving signal.It was realizing
Cheng Zhong can be and carry out pulse compression to the first phase synchronization signal and second phase synchronization signal received respectively, in turn
Extract peak phase.
In embodiments of the present invention, it is first determined the pulse widths of the first and second phase synchronized signals and transmitting described the
One and second phase synchronization signal initial time, wherein at the time of initial time is located at adjacent twice emitting radar signal it
Between；Then, the first SAR is controlled to the 2nd SAR transmitting second according to the pulse width of second phase synchronization signal and initial time
Phase synchronized signal；The 2nd SAR is controlled according to the pulse width of second phase synchronization signal and initial time to emit to the first SAR
First phase synchronization signal；It is received further according to the first SAR the first synchronous peak phase for receiving signal received and the 2nd SAR
The synchronous peak phase for receiving signal of second arrived, determines compensation phase；Finally, being connect according to compensation phase to the 2nd SAR
The second echo received signal received carries out Phase synchronization compensation.In this way, due to transmitting first phase synchronization signal and the second phase
When the initial time of bit synchronization signal is located at vacant except the echo samples window of radar signal period and echo-signal
Between, it can be avoided interrupt normal radar work in this way, and then improve the working efficiency of radar.Due in receives echo-signal
Receiving phase synchronization signal simultaneously increases the flexibility of system design.
Embodiment two
Referring to Fig. 2, Fig. 2 is the biradical synthetic aperture radar based on encoded signal that another embodiment of the invention provides
The flow diagram of phase synchronization method, is applied to double star SAR system, which includes at least the first SAR and second
SAR, this method mainly comprise the steps that
S201, the pulse width for determining the first and second phase synchronized signals.
In the present embodiment, the pulse width of first phase synchronization signal is identical as the synchronous pulse width of second phase.
S202, the initial time for emitting first and second phase synchronized signal is determined.
Between at the time of the initial time is located at adjacent twice emitting radar signal.
S203, the carrier frequency for obtaining radar signal.
The carrier frequency of radar signal can be obtained from radar parameter.
S204, is determined according to the carrier frequency of the pulse width of second phase synchronization signal, initial time and radar signal
Two-phase bit synchronization signal.
The carrier frequency of the second phase synchronization signal and the carrier frequency of radar signal are identical.The second phase synchronization signal is and thunder
Up to the encoded signal of signal in orthogonal.
S205, the first SAR of control emit second phase synchronization signal to the 2nd SAR.
S206, is determined according to the pulse width and initial time of first phase synchronization signal and the carrier frequency of radar signal
One phase synchronized signal.
The carrier frequency of the first phase synchronization signal and the carrier frequency of radar signal are identical.The first phase synchronization signal is and thunder
Up to the encoded signal of signal in orthogonal.
S207, the 2nd SAR of control emit first phase synchronization signal to the first SAR.
S208, the received according to the first SAR the first synchronous peak phase for receiving signal received and the 2nd SAR
The two synchronous peak phases for receiving signal, determine compensation phase.
S209, Phase synchronization compensation is carried out to the second echo reception that the 2nd SAR is received according to the compensation phase.
In other embodiments of the present invention, S201 can be realized by following steps:
S2011, the wave position data parameters for obtaining double star SAR system；
S2012, two adjacent pulse-recurrence time (Pulse- are determined respectively according to the wave position data parameters
Recurrence-Time, PRT) in the first vacant duration and the second vacant duration；
First vacant duration is radar signal end time opening to radar return sample window in two adjacent PRT
The vacant duration to begin between the time, the second vacant duration is the end time of two adjacent radar return sample windows to next
Vacant duration between at the beginning of PRT；
S2013, is determined according to the signal-to-noise ratio of the first vacant duration, the second vacant duration and preset phase synchronized signal
The pulse width of one Phase synchronization and second phase synchronization signal.
Maximum value in PRT previous in two adjacent PRT in the first vacant duration and the second vacant duration is determined
For first threshold；Maximum value in two adjacent PRT in the latter PRT in the first vacant duration and the second vacant duration is true
It is set to second threshold；Minimum value in first threshold and second threshold is determined as third threshold value；According to the first SAR and second
The distance between SAR determines the transmission duration of first phase synchronization signal and second phase synchronization signal；According to third threshold value and
The transmission duration of first phase synchronization signal and second phase synchronization signal determines the maximum value of pulse width；According to preset phase
The signal-to-noise ratio of bit synchronization signal determines the minimum value of pulse width；The first phase is determined according to the maximum value of pulse width and minimum value
Bit synchronization signal and second phase synchronous signal impulse width.
First phase synchronization signal and first phase synchronization signal are determined according to the maximum value of pulse width and minimum value
Pulse width can be there are many implementation: for example, the median of minimum value and maximum value can be determined as pulse width,
It can be one numerical value of random selection between minimum value to maximum value and be determined as pulse width.It is of course also possible to generate one
Prompt information prompts user to input a minimum value to the numerical value between maximum value, by the minimum value of staff's input and most
Numerical value between big value is determined as pulse width.
In the embodiment of the present invention and other embodiments, the realization process of the initial time of first phase synchronization signal is determined
It is similar with the process for determining second phase synchronization signal.Here, for determining first phase synchronization signal, illustrate to realize
Process.
In other embodiments of the present invention, S202 determines that the initial time of transmitting first phase synchronization signal is further wrapped
It includes:
S2021, the wave position data parameters for obtaining double star SAR system；
S2022, according to the wave position data parameters determine transmitting first phase synchronization signal PRT in the first vacant duration
With the second vacant duration；
First vacant duration be in PRT at the beginning of the radar signal end time to radar return sample window between
Vacant duration, at the beginning of the end time to next PRT that the second vacant duration is radar return sample window between
Vacant duration；
S2023, when determining the starting of transmitting first phase synchronization signal according to the first vacant duration and the second vacant duration
Between.
In other embodiments of the present invention, S208 determines that compensation phase further comprises:
The first reception signal that S2081, the first SAR are received contains the first echo received signal and the first synchronous receive is believed
Number, the radar signal of radar emission is the linear FM signal of negative frequency modulation, and the synchronization signal of radar emission is the linear of negative frequency modulation
FM signal.The matched filter for constructing the linear FM signal of positive frequency modulation receives signal to first and carries out pulse compression, extracts
The first synchronous peak phase for receiving signal.
The second reception signal that S2082, the 2nd SAR are received contains the second echo received signal and the second synchronous receive is believed
Number, the matched filter of the linear FM signal of positive frequency modulation is constructed, signal is received to second and carries out pulse compression, it is same to extract second
Step receives the peak phase of signal.
S2083, the first synchronous peak phase peak phase for receiving signal synchronous with second for receiving signal is made the difference and is removed
With 2, compensation phase is obtained.
In other embodiments of the present invention, determine that transmitting first phase is same according to the first vacant duration and the second vacant duration
The initial time for walking signal further comprises: if the first vacant duration is greater than the second vacant duration, by radar signal knot
The beam time is determined as the initial time of first phase synchronization signal；If the first vacant duration is less than or equal to the second vacant duration,
The end time of radar return sample window is determined as to the initial time of first phase synchronization signal.
It should be noted that can refer in the present embodiment with the explanation of same steps in other embodiments or concept other
Description in embodiment, details are not described herein again.
In phase synchronization method provided in an embodiment of the present invention, it is first determined the arteries and veins of the first and second phase synchronized signals
It rushes width and emits the initial time of the first and second phase synchronized signals, wherein initial time is located at adjacent twice emitting thunder
Between at the time of up to signal；Then, the first SAR is controlled to the according to the pulse width of second phase synchronization signal and initial time
Two SAR emit the second phase synchronization signal；According to the pulse width of first phase synchronization signal and initial time control the
Two SAR emit first phase synchronization signal to the first SAR；The the first synchronous peak for receiving signal received further according to the first SAR
The peak phase of value phase and the second synchronous reception signal that the 2nd SAR is received, determines compensation phase；Finally, according to compensation
Phase carries out Phase synchronization compensation to the second echo received signal that the 2nd SAR is received.In this way, since transmitting first phase is same
The initial time of step signal and second phase synchronization signal is located at the echo samples of radar signal period and echo-signal
Free time except window can be avoided interrupt normal radar work in this way, and then improves the working efficiency of radar.Due to
Receiving phase synchronization signal while receives echo-signal increases the flexibility of system design.
Referring to Fig. 3, Fig. 3 is the biradical synthetic aperture radar phase based on encoded signal that further embodiment of this invention provides
The flow diagram of bit synchronization method, is applied to double star SAR system, and double star SAR system includes at least primary and auxiliary star, wherein
Primary emits radar signal, and primary and auxiliary star receive radar signal.Method includes the following steps:
S1, the linear FM signal that phase synchronized signal is positive frequency modulation, radar signal are the linear FM signal of negative frequency modulation,
Phase synchronized signal is identical as Carrier Frequency on Radar Signal.
Fig. 4 is the composed structure schematic diagram of double star of embodiment of the present invention SAR system, as shown in figure 4, including primary 30 and auxiliary
Star 31；Wherein, primary 30, for emitting radar signal, auxiliary star 31, for receiving the echo-signal of radar signal；Primary 30 wraps
Include: primary Global Navigation Satellite System (GNSS, Global Navigation Satellite System) tame module 301,
Primary reference frequency source 302, primary frequency modulation signal source 303, primary synchronize transceiver 304, primary synchronizes antenna 305, in primary
Scaler 306, primary microwave combination 307, primary receiver 308, primary data shaper 309；Auxiliary star 31 includes: auxiliary star GNSS
Tame the synchronous transceiver 314 of module 311, auxiliary star reference frequency source 312, auxiliary star frequency modulation signal source 313, auxiliary star, the synchronous day of auxiliary star
Line 315, auxiliary star internal calibrator 316, auxiliary star microwave combination 317, auxiliary star receiver 318 and auxiliary sing data shaper 319, in which:
Primary GNSS tames module 301, for providing frequency time signal for primary reference frequency source 302；
Primary reference frequency source 302, for generating multiple works on the basis of the frequency that primary GNSS tames the offer of module 301
Working frequency signal is to be supplied to primary frequency modulation signal source 303；
Primary frequency modulation signal source 303, for providing linear tune for the synchronous transceiver 304 of primary and primary internal calibrator 306
Frequency signal；
Primary synchronizes transceiver 304, and for being synchronized by primary, antenna 305 emits to auxiliary star 31 or receiving phase synchronizes letter
Number；
Primary synchronizes antenna 305, is used for the transmitting of auxiliary star 31 or receiving phase synchronization signal；
Primary internal calibrator 306 and auxiliary star internal calibrator 316, for sending the synchronization transceiver of primary 30 or auxiliary star 31
Signal calibrated；
Primary microwave combination 307, the phase synchronized signal emitted for receiving the synchronous transceiver 304 of primary, and to primary
Synchronous transceiver 304 emits signal；
Primary receiver 308, for receiving the signal of the transmission of primary microwave combination 307, and to primary data shaper 309
Send signal；
Primary data shaper 309, for the signal received to be carried out data processing；
Auxiliary star GNSS tames module 311, be used for supplemented by star reference frequency source 312 provide frequency time signal；
Auxiliary star reference frequency source 312, for generating multiple works on the basis of the frequency that auxiliary star GNSS tames the offer of module 311
Working frequency signal is to be supplied to auxiliary star frequency modulation signal source 313；
Auxiliary star frequency modulation signal source 313, be used for supplemented by the synchronous transceiver 314 of star and auxiliary star internal calibrator 316 linear tune is provided
Frequency signal；
The synchronous transceiver 314 of auxiliary star, for synchronizing antenna 315 to the transmitting of primary 30 or the synchronous letter of receiving phase by auxiliary star
Number；
The synchronous antenna 315 of auxiliary star is used for the transmitting of primary 30 or receiving phase synchronization signal；
Auxiliary star microwave combination 317, the phase synchronized signal emitted for receiving the synchronous transceiver 314 of auxiliary star, and Xiang Fuxing
Synchronous transceiver 314 emits signal；
Auxiliary star receiver 318, the signal sent for receiving auxiliary star microwave combination 317, and to auxiliary sing data shaper 319
Send signal；
The auxiliary sing data shaper 319, for carrying out data processing to the signal received.
The reference frequency source of primary 30 and auxiliary star 31 can be used GNSS and tame crystal oscillator, can reduce two stars as far as possible in this way
Radar frequency deviation so that the sampling in phase error data collection process meets Nyquist (Nyquist) theorem, in turn
The complexity that phasic synchrony error is extracted and compensated can be simplified, improve phase locked reliability.
S2, for a pulse repetition period, then primary first emits radar signal using echo emitter window and receiving window
Except free time, primary emit synchronization signal, in echo reception time, primary receives echo-signal, auxiliary star receives simultaneously
Echo-signal and synchronization signal.
S3, subsequent next pulse repetition period, primary first emit radar signal and then utilize echo emitter window and reception
Free time except window, auxiliary star emits synchronization signal, and in the echo reception time, primary simultaneously believe with synchronous by receives echo-signal
Number, auxiliary star receives echo-signal.
After the signal that S4, major-minor star receive passes to data shaper, under reach ground, ground can be mentioned by processing
Compensation phase is got, phasic synchrony error is then compensated.
Here, Fig. 5 is the timing diagram of primary of the embodiment of the present invention and auxiliary star receiving and transmitting signal, as shown in figure 5, for an arteries and veins
It rushes the repetition period, primary emits radar signal in radar signal window 401 first, wherein the duration of radar signal window
Add guard time for the pulse width of radar signal；Then the free time primary Xiang Fuxing of 404 front and back of echo reception window is utilized
Transmitter phase synchronization signal 402, then auxiliary star receives the synchronization signal 403 of primary within the reception window time of echo；Under
In one PRT, auxiliary star emits synchronization signal 402 to primary using identical free time, realizes that pulse pair passes.
In other embodiments of the invention, as another alternative of S302, it may be such that in a pulse weight
In the multiple period, radar signal is first emitted by primary, then using the free time except echo emitter window and echo reception window, by auxiliary
Star emits synchronization signal, and primary receives；Then in the next pulse repetition period, the free time before and after echo reception window is utilized
Synchronization signal is emitted by primary, auxiliary star receives.
Fig. 6 is the implementation process schematic diagram of Phase synchronization of embodiment of the present invention compensation, as shown in fig. 6, Phase synchronization compensates
It can be realized by following steps:
S501a receives the data that primary passes down；
S501b receives the data that auxiliary star passes down；
S502a carries out pulse compression to the matched filter for the data configuration synchronization signal that primary passes down, extracts peak value phase
Peak phase is extracted in position；
S502b carries out pulse compression to the matched filter for the data configuration synchronization signal that auxiliary star passes down, extracts peak value phase
Peak phase is extracted in position；
S503, major-minor star peak phase make difference divided by 2, obtain compensation phase；
S504, compensation phase carry out interpolation by radar return orientation points；
S505 compensates auxiliary star echo data using interpolation post-compensation phase point by point.
It should be noted that the primary and auxiliary star in the embodiment of the present invention are first in other embodiments of the invention
SAR and the 2nd SAR, but be not one-to-one, for example it is also likely to be auxiliary star that the first SAR, which may be primary, if the first SAR
Primary, then the 2nd SAR be supplemented by star；Similarly, if the first SAR is auxiliary star, the 2nd SAR is primary.
In embodiments of the present invention, phase synchronized signal is the linear FM signal of positive frequency modulation, and radar signal is negative frequency modulation
Linear FM signal, phase synchronized signal is identical as Carrier Frequency on Radar Signal；Radar signal and synchronization signal use time division emission
Mode, a pulse repetition period is first emitted and radar signal and then is utilized except radar emission window and echo reception window
Free time emits synchronization signal by primary, and in the echo reception window time, primary receives echo-signal, auxiliary star receives synchronous letter
Number and echo-signal；It is then received again by auxiliary star transmitting synchronization signal primary in the next pulse repetition period, realizes that phase is same
The alternating of pace pulse is to biography.Since phase synchronized signal carrier frequency is identical as radar signal, radar emission signal can be avoided
Influence to synchronization signal, while the transmitting-receiving of phase synchronized signal is the free time being utilized before and after echo reception window, it can
Normal radar work is not interrupted, improves radar operating frequency.
Echo received signal is with the symbol of the synchronous frequency modulation rate for receiving signal on the contrary, therefore synchronizing reception signal
Peak phase can minimize influence of the echo received signal to peak phase when extraction, carry out echo received signal
When imaging, the synchronous influence for receiving signal to imaging can be minimized.Echo received signal is total with synchronous reception signal
With an echo reception time window, the flexibility of system design can be increased.
Referring to Fig. 7, Fig. 7 is the biradical synthetic aperture radar phase based on encoded signal that yet another embodiment of the invention provides
The structural schematic diagram of bit synchronizer, the device include:
Second receiving module 601 receives sent by the second synthetic aperture radar first for the first synthetic aperture radar
Phase synchronized signal, obtains the first synchronous reception signal, and second synthetic aperture radar is received by first synthetic aperture
The second phase synchronization signal that radar is sent obtains the second synchronous reception signal；
Determining module 602, for determining the described first synchronous peak value for receiving signal reception signal synchronous with described second
Phase difference, and compensation phase is determined using the first preset rules according to the peak phase difference；
Compensating module 603, for carrying out phase compensation to second echo received signal according to the compensation phase.
Fig. 8 is referred to, Fig. 8 shows the hardware structure diagram of a kind of electronic equipment.
Electronic equipment as described in this embodiment, comprising:
Memory 71, processor 72 and it is stored in the computer program that can be run on memory 71 and on a processor, located
Reason device realizes the biradical synthetic aperture radar phase described in aforementioned embodiment illustrated in fig. 1 based on encoded signal when executing the program
Bit synchronization method.
Further, the electronic equipment further include:
At least one input equipment 73；At least one output equipment 74.
Above-mentioned memory 71,72 input equipment 73 of processor and output equipment 77 are connected by bus 75.
Wherein, input equipment 73 concretely camera, touch panel, physical button or mouse etc..Output equipment
74 concretely display screens.
Memory 71 can be high random access memory body (RAM, Random Access Memory) memory, can also
For non-labile memory (non-volatile memory), such as magnetic disk storage.Memory 71 can for storing one group
Program code is executed, processor 72 is coupled with memory 71.
Further, the embodiment of the invention also provides a kind of computer readable storage medium, the computer-readable storages
Medium can be in the terminal being set in the various embodiments described above, which can be shown in earlier figures 8
Memory in embodiment.It is stored with computer program on the computer readable storage medium, when which is executed by processor
Realize the biradical synthetic aperture radar phase synchronization method described in aforementioned embodiment illustrated in fig. 1 based on encoded signal.Into one
Step ground, the computer can storage medium can also be USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory),
Random access memory (RAM, Random Access Memory), magnetic or disk etc. be various to can store program code
Medium.
In multiple embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, embodiments described above is only schematical, for example, the division of the module, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple module or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling or direct-coupling or communication linkage can be through some interfaces, the INDIRECT COUPLING or communication linkage of module can
To be electrically mechanical or other forms.
The module as illustrated by the separation member may or may not be physically separated, aobvious as module
The component shown may or may not be physical module, it can and it is in one place, or may be distributed over multiple
On network module.Some or all of the modules therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
It, can also be in addition, each functional module in each embodiment of the present invention can integrate in a processing module
It is that modules physically exist alone, can also be integrated in two or more modules in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.
It should be noted that for the various method embodiments described above, describing for simplicity, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because
According to the present invention, certain steps can use other sequences or carry out simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related actions and modules might not all be this hair
Necessary to bright.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.
The above are to the biradical synthetic aperture radar phase synchronization method provided by the present invention based on encoded signal, dress
It sets, the description of electronic equipment and storage medium, for those of ordinary skill in the art, thought according to an embodiment of the present invention,
There will be changes in the specific implementation manner and application range, and to sum up, the content of the present specification should not be construed as to the present invention
Limitation.
Claims (10)
1. a kind of biradical synthetic aperture radar phase synchronization method based on encoded signal characterized by comprising
First synthetic aperture radar receives the first phase synchronization signal sent by the second synthetic aperture radar, and it is synchronous to obtain first
Signal is received, second synthetic aperture radar receives the synchronous letter of second phase sent by first synthetic aperture radar
Number, obtain the second synchronous reception signal；
Determine that the described first synchronous peak phase for receiving signal reception signal synchronous with described second is poor, and according to the peak value
Phase difference determines compensation phase using the first preset rules；
According to the compensation phase, phase compensation is carried out to second echo received signal.
2. the biradical synthetic aperture radar phase synchronization method according to claim 1 based on encoded signal, feature exist
It receives in, first synthetic aperture radar and second synthetic aperture radar and is emitted by first synthetic aperture radar
The echo-signal that radar signal generates, obtains the first echo received signal and the second echo received signal；
First synthetic aperture radar stores first echo received signal reception signal synchronous with described first simultaneously, obtains
Signal is received to first；
Second synthetic aperture radar stores second echo received signal reception signal synchronous with described second simultaneously, obtains
Signal is received to second.
3. the biradical synthetic aperture radar phase synchronization method according to claim 2 based on encoded signal, feature exist
In the first phase synchronization signal and the second phase synchronization signal are orthogonal with the radar signal respectively.
4. according to claim 1 to the biradical synthetic aperture radar Phase synchronization side described in 3 any one based on encoded signal
Method, which is characterized in that vacant except the launch time section of the radar signal and the echo samples window of the echo-signal
Time carries out the transmission of the first phase synchronization signal and the second phase synchronization signal；
In the echo samples window of the echo-signal, carries out described first and synchronize reception signal reception signal synchronous with described second
Reception.
5. according to claim 1 to the biradical synthetic aperture radar Phase synchronization side described in 3 any one based on encoded signal
Method, which is characterized in that first synthetic aperture radar is same in the free time transmitting second phase of the first pulse-recurrence time
Signal is walked, second synthetic aperture radar is adopted in the echo of the echo-signal of the radar signal of first pulse-recurrence time
Sample window receives the described second synchronous reception signal；
Free time of second synthetic aperture radar in the second pulse-recurrence time emits first phase synchronization signal, described
First synthetic aperture radar receives institute in the echo samples window of the echo-signal of the radar signal of first pulse-recurrence time
State the first synchronous reception signal.
6. according to claim 1 to the biradical synthetic aperture radar Phase synchronization side described in 3 any one based on encoded signal
Method, which is characterized in that the method also includes:
According to the duration for the free time for being used for transmission the first phase synchronization signal and the second phase synchronization signal, with
And the transmission duration of the first phase synchronization signal and the second phase synchronization signal is determined according to the second preset rules
The pulse width maximum value of the first phase synchronization signal and second phase synchronization signal；
The first phase synchronization signal and second phase are determined according to third preset rules according to default snr threshold
The pulse width minimum value of bit synchronization signal.
7. the biradical synthetic aperture radar phase synchronization method according to claim 6 based on encoded signal, feature exist
In the carrier frequency of the first phase synchronization signal and the second phase synchronization signal is identical as the carrier frequency of the radar signal.
8. a kind of biradical synthetic aperture radar phase synchronous device based on encoded signal characterized by comprising
Receiving module receives the synchronous letter of first phase sent by the second synthetic aperture radar for the first synthetic aperture radar
Number, the first synchronous reception signal is obtained, what the second synthetic aperture radar reception was sent by first synthetic aperture radar
Second phase synchronization signal obtains the second synchronous reception signal；
Determining module, for determining that the described first synchronous signal peak phase for receiving signal synchronous with described second that receives is poor,
And compensation phase is determined using the first preset rules according to the peak phase difference；
Compensating module, for carrying out phase compensation to second echo received signal according to the compensation phase.
9. a kind of electronic equipment, comprising: memory, processor and storage are on a memory and the calculating that can run on a processor
Machine program, which is characterized in that when the processor executes the computer program, realize any one of claim 1 to 7 institute
The each step in the biradical synthetic aperture radar phase synchronization method based on encoded signal stated.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
When being executed by processor, the biradical synthetic aperture radar based on encoded signal described in any one of claim 1 to 7 is realized
Each step in phase synchronization method.
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