CN109782284A - A method of the synchronous interference SAR of Long baselines is realized based on pulse code - Google Patents
A method of the synchronous interference SAR of Long baselines is realized based on pulse code Download PDFInfo
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Abstract
The present invention provides the methods for realizing the synchronous interference SAR of Long baselines based on pulse code, distance is carried out to radar return data to handle to resolving, restore the radar return data of the corresponding different transmission channels of separation, orientation resolving processing is carried out respectively to the radar return data of different transmission channels again, restore the radar return data of the corresponding different receiving channels of separation, the radar return data of two kinds of transmission channels and receiving channel combination are obtained, i.e. A sends out two kinds of interference SAR echo datas that A is received, B hair B is received；SAR imaging and interference processing are carried out to interference SAR echo data, obtain InSAR elevation map.The present invention realizes equivalent long interference baseline schema.
Description
Technical field
The present invention relates to Radar Technology fields, and in particular to one kind realizes the synchronous interference SAR of Long baselines based on pulse code
Method.
Background technique
Synthetic aperture radar (SAR) is a kind of high-resolution microwave imaging radar, can carry out high-resolution on a surface target
The detection of rate, and there is round-the-clock, round-the-clock advantage.Interference synthetic aperture radar (InSAR) is with round-the-clock, whole day
When imaging capability while, can measure target elevation, obtain zone digit hypsographic map, therefore, InSAR is widely used in
The fields such as mapping, Ground Deformation monitoring are limited the application fields such as mapping and the emergency mapping in area in optical survey, have
Irreplaceable role.
Interference baseline length is to influence the key factor of interference SAR height accuracy, is mounted on the interference of Miniature Vehicle platform
SAR system, the mounting condition that interference baseline length is limited to flying platform can use multiple to improve height accuracy
Antenna emits simultaneously while the corresponding received equivalent equivalent long interference baseline schema for increasing interference baseline length, however, traditional
Interference SAR system implementation method, can not under the premise of ensureing signal interference, distinguish different antennae transmitting signal echo
Signal cannot achieve equivalent long interference baseline schema.
Therefore, in order to make interference SAR system realize higher height accuracy on Miniature Vehicle platform, exist in this field
Following demand: changing the system system of conventional interference SAR, enables to be adapted to carry out equivalent long interference baseline schema.
Summary of the invention
In view of above-mentioned technical problem, the purpose of the present invention is to provide one kind based on pulse code, and to realize that Long baselines synchronize dry
The method for relating to SAR, is encoded using continuous impulse, realizes equivalent long interference baseline schema, and can be by traditional interference SAR multi-pass
Road receives system and merges into single channel reception realization.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
According to an aspect of the present invention, it additionally provides and a kind of the synchronous interference SAR of Long baselines is realized based on pulse code
Method, comprising the following steps:
Transmitting uses two transmission channels, including A transmission channel and B transmission channel, and two transmission channels emit tool simultaneously
There are two kinds of multiple-pulse groups of different continuous impulse codings；Or transmitting uses a transmitter and two emitting antennas, including A to emit
Antenna and B transmitting antenna, two emitting antennas switching transmitting have two kinds of multiple-pulse groups of different continuous impulses coding；
A receiving antenna and B receiving antenna in the transmitting gap of continuous impulse code set while receiving radar echo signal；
Two-way receives the carry out phase shift coding all the way in signal, and signal combining is then received with another way, and formation connects all the way
The collection of letters number；Or two-way receives signal and carries out phase shift coding respectively, is then combined, formation receives signal all the way；
The signal of reception all the way formed enters single-channel receiver, changes to form radar return data through digital-to-analogue；
Distance is carried out to echo data to handle to resolving, restores two kinds of radars of the isolated different transmission channels of correspondence
Echo data；
Again orientation resolving processing is carried out to the radar return data of different transmission channels respectively, it is corresponding different to restore separation
The radar return data of receiving channel, obtain two kinds of transmission channels and receiving channel combination radar return data, i.e. A send out A receive,
B sends out B and receives two kinds of interference SAR echo datas；
SAR imaging and interference processing are carried out to interference SAR echo data, obtain InSAR elevation map.
In certain embodiments of the present invention, described two transmission channels emit two kinds with different pulse codes simultaneously
Multiple-pulse group, in signal transmitting, two kinds of multiple-pulse groups are not overlapped in time.
In certain embodiments of the present invention, the two-way receives the carry out phase shift coding all the way in signal, is to all the way
The encoded interval that signal presses pulse group is received, phase code is carried out.
In certain embodiments of the present invention, the two-way receives signal and carries out phase shift coding respectively, is received to two-way
Signal presses the encoded interval of pulse group, carries out phase code respectively.
In certain embodiments of the present invention, described that orientation is carried out respectively to the radar return data of different transmission channels again
It is handled to resolving, the radar signal for corresponding to different receiving channels positioned at different subspace is separately separated out, recovery obtains generation
The radar return data of table difference receiving channel.
According to another aspect of the present invention, it provides and a kind of the synchronous interference SAR of Long baselines is realized based on pulse code
System, comprising:
Pumping signal module, for generating two kinds of multiple-pulse groups for using subband alternation sum time interleaving to be encoded, point
It is not input to the first transmitter and the second transmitter.
First transmitter and the second transmitter for amplifying two kinds of multiple-pulse groups, and pass through two circulator outputs respectively
To A antenna and B antenna.
A antenna receives echo-signal and B antenna hair that A antenna transmitting signal generates for emitting A antenna encoded signal
Penetrate the echo-signal of signal generation.
B antenna receives echo-signal and B antenna hair that A antenna transmitting signal generates for emitting B antenna encoded signal
Penetrate the echo-signal of signal generation.
Phase shifter, for receiving signal or B antenna reception signal progress phase shift coding to the A antenna by circulator.
Combiner, for by after the coding of phase shift all the way reception signal and another way receive signal synthesis signal all the way.
Receiver, for receiving the reception signal after being combined.
Data acquisition module, for being digitized to the signal that receiver exports.
Imaging and interference processing module, for radar return data carry out signal recovery processing, imaging and
Interference processing；Signal recovery processing includes carrying out distance to radar return data to handle to resolving, restores the corresponding different hairs of separation
The radar return data in channel are penetrated, then orientation resolving processing is carried out respectively to the radar return data of different transmission channels, it is extensive
The radar return data of subdivision receiving channel different from correspondence obtain the radar return of two kinds of transmission channels and receiving channel combination
Data, i.e. A send out two kinds of interference SAR echo datas that A is received, B hair B is received；To interference SAR echo data carry out SAR imaging and
Interference processing, obtains InSAR elevation map.
In certain embodiments of the present invention, a phase shifter, respectively the first phase shifter are replaced using two phase shifters
With the second phase shifter, the first phase shifter receives signal to A antenna and carries out phase shift coding, and the second phase shifter receives signal to B antenna
Carry out phase shift coding；
Combiner phase shift is encoded after the signal of reception all the way and another way receive signal synthesis signal all the way.
In certain embodiments of the present invention, using a transmitter and switching two transmitters of switch in place, by
Emit coded pulse group in A antenna and B antenna transmitting coded pulse group is staggered in time, by switching switch in the time
The subpulse that upper control pumping signal module, transmitter export is separately sent to A antenna and B antenna, realizes two kinds of multiple-pulse groups
Emit respectively in two antennas.
It can be seen from the above technical proposal that the present invention is based on the methods that pulse code realizes the synchronous interference SAR of Long baselines
At least have the advantages that one of them:
(1) echo-signal of different antennae transmitting signal can be distinguished under the premise of signal synchronizes received, realize etc.
The long interference baseline schema of effect；
(2) single receiving channel is only needed, design difficulty is reduced, simplifies system realization；
(3) multi-channel system receiving channel inconsistence problems are eliminated.
Detailed description of the invention
By the explanation below in conjunction with attached drawing, and with to more comprehensively understanding of the invention, other objects of the present invention
It will become clearer and should be readily appreciated that with effect, in which:
Fig. 1 is conventional interference SAR imaging geometry schematic diagram.
Fig. 2 is conventional interference SAR system structural schematic diagram.
Fig. 3 is that the structure of system of the first embodiment of the invention based on the synchronous interference SAR of pulse code realization Long baselines is shown
It is intended to.
Fig. 4 is the work original for the system that first embodiment of the invention realizes the synchronous interference SAR of Long baselines based on pulse code
Manage schematic diagram.
Fig. 5 is the transmitting volume for the system that first embodiment of the invention realizes the synchronous interference SAR of Long baselines based on pulse code
Code schematic diagram.
Fig. 6 is the reception volume for the system that first embodiment of the invention realizes the synchronous interference SAR of Long baselines based on pulse code
Code schematic diagram.
Fig. 7 is that the structure of system of the second embodiment of the invention based on the synchronous interference SAR of pulse code realization Long baselines is shown
It is intended to.
Fig. 8 is that the structure of system of the third embodiment of the invention based on the synchronous interference SAR of pulse code realization Long baselines is shown
It is intended to.
Fig. 9 is that the structure of system of the fourth embodiment of the invention based on the synchronous interference SAR of pulse code realization Long baselines is shown
It is intended to.
Specific embodiment
Before the present invention is described in detail, the image-forming principle and system structure of conventional interference SAR are first introduced.
As shown in Figure 1, A and B respectively indicate the position of interference SAR antenna, H indicates the height of interference SAR, and P indicates ground
One target point, the oblique distance R of P to antenna A1It indicates, the oblique distance R of P to antenna B2It indicates, h indicates the landform of measured target point P
Highly.Length between antenna A and antenna B is interference baseline length, true in imaged viewing angle, interference baseline angle and relative altitude
In the case where fixed, interference baseline length is to influence the mostly important factor of height accuracy.
At work, using single-antenna transmission, multiple antennas receives conventional interference SAR.Equivalent long interference baseline schema uses
Multi-antenna transmission, multiple antennas is corresponding to be received, and the interference baseline length of this scheme is the interference base length of conventional interference SAR scheme
Twice of degree.
As shown in Fig. 2, the system of conventional interference SAR includes 1 transmitter；2 dual-mode antennas, respectively A dual-mode antenna
With B dual-mode antenna；2 receivers；2 data acquisition modules；The pumping signal module and imaging module of transmission channel swash
It encourages signaling module and imaging module is common sparing.As can be seen that the receiving channel of conventional interference SAR can be regarded as substantially
It is made of the receiving channel of two SAR, system structure is more complicated, is unfavorable for realizing small light.
The present invention is described in detail below, bright to make the object, technical solutions and advantages of the present invention clearer
White, Yi Xiajiehejutishishili,Bing Canzhaofutu,Dui Benfamingjinyibuxiangxishuoming.
First embodiment:
In the present embodiment, a kind of system that the synchronous interference SAR of Long baselines is realized based on pulse code is provided.Such as Fig. 3
It is shown, the present invention is based on the system that pulse code realizes the synchronous interference SAR of Long baselines include: pumping signal module, transmitter one,
Transmitter two, A antenna, B antenna, receiver, phase shifter, combiner, data acquisition module, imaging and interference processing mould
Block.
Pumping signal module is used to generate the two kinds of multiple-pulse groups encoded using subband alternation sum time interleaving, respectively
It is input to transmitter one and transmitter two.
Transmitter one and transmitter two are output to A days by two circulators respectively for amplifying two kinds of multiple-pulse groups
Line and B antenna.
A antenna receives echo-signal and the transmitting of B antenna that A antenna transmitting signal generates for emitting A antenna encoded signal
The echo-signal that signal generates.
B antenna receives echo-signal and the transmitting of B antenna that A antenna transmitting signal generates for emitting B antenna encoded signal
The echo-signal that signal generates.
Phase shifter, which is used to receive signal to the B antenna by circulator, carries out phase shift coding.It should be noted that phase shifter
Signal can also be received to the A antenna by circulator and carry out phase shift coding.
Combiner be used for by after the coding of phase shift all the way reception signal and another way receive signal synthesis signal all the way.
Receiver is used to receive the reception signal after combining.
The signal that data acquisition module is used to export receiver digitizes.
Imaging and interference processing module are used to carry out radar return data signal recovery processing, imaging and do
Relate to processing；Signal recovery processing includes carrying out distance to radar return data to handle to resolving, restores the corresponding different transmittings of separation
The radar return data in channel, then orientation resolving processing is carried out respectively to the radar return data of different transmission channels, restore
The radar return data of the corresponding different receiving channels of separation, obtain the radar return number of two kinds of transmission channels and receiving channel combination
According to i.e. A sends out two kinds of interference SAR echo datas that A is received, B hair B is received；SAR imaging is carried out to interference SAR echo data and is done
Processing is related to, InSAR elevation map is obtained.
It should be noted that A hair A receipts refer to that A antenna transmitting A antenna receives, B hair B receipts refer to that B antenna transmitting B antenna connects
It receives.
As shown in figure 4, Fig. 4 is the working method based on transmitting signal continuous impulse coding, A antenna replaces hair with B antenna
The subpulse transmitting signal of continuous impulse is penetrated, between transmitting subpulse, A antenna and B antenna receive radar echo signal simultaneously,
In A antenna and B antenna end, A antenna receives A antenna transmitting signal and B antenna transmitting signal simultaneously, and B antenna receives A antenna simultaneously
Emit signal and B antenna emits signal.
When signal receives, firstly, the reception signal to an antenna carries out phase shift coding, believe the reception of two antennas
Number be in space encoder two nonoverlapping subspaces；Then, combining carries out data acquisition into receiver all the way again, obtains
The radar return data all the way that four channels mix；Finally, being obtained equivalent by resolving processing and signal recovery processing
Two channel radar echo signals of long interference baseline: A antenna emits the received A hair A of A antenna and receives radar echo signal, B antenna
Emit the received B hair B of B antenna and receives radar echo signal.SAR imaging is carried out to the echo data in the two channels again and is done
Processing is related to, InSAR elevation map is obtained.
As shown in figure 5, this transmitting coding uses continuous impulse coding mode, i.e. the complete echo of target is distributed in multiple
The reception window of subpulse needs to restore by signal just recover complete echo-signal；When pumping signal module uses
Between staggeredly carry out multiple-pulse coding two kinds of multiple-pulse groups, A antenna transmitting coding subpulse composition A antenna emit coded pulse
Group, B antenna transmitting coding subpulse composition B antenna emit coded pulse group；A antenna emits coded pulse group and the transmitting of B antenna
The subpulse of coded pulse group is staggered in time, shares identical reception window；A antenna emits coded pulse group and B
Antenna is emitted coded pulse group and is encoded using independent continuous impulse.
As shown in fig. 6, when interference SAR receives, when carrying out phase code to the reception signal of a receiving antenna, from the 1st
Group continuous impulse code set starts, terminates to recycle for 1 with 2 groups of continuous impulse code sets, and is recycled and encoded with this, method
It is as follows:
For the 1st group of continuous impulse code set, it is labeled as Ma pulse group；
For the 2nd group of continuous impulse code set, it is labeled as Mb pulse group；
The additive phase of Ma pulse group is set as 0；
The additive phase of Mb pulse group is π；
When signal resolves recovery, resolving processing is carried out respectively to two kinds of radar return data of different transmission channels, it will
The radar signal for corresponding to different receiving channels positioned at different subspace is separately separated out, and recovery obtains representing different receiving channels
Radar return data.
The present embodiment is when resolving, progress phase alignment processing first, that is, makes the reception signal of different coding pulse group
Initial phase is identical.It is among frequency spectrum in this way, antenna receives the uncoded signaling protein14-3-3 signal that receives all the way of signal, antenna
The both ends for receiving signaling protein14-3-3 signal all the way and being in frequency spectrum of Signal coding are received, before signal restores, coded pulse group is connect
Script aliasing collect mail number when receiving together, but is handled by the phase alignment to pulse code group signal, in orientation frequency
Become to divide on domain, can be separated using filtering processing.
In the present embodiment, a kind of method that the synchronous interference SAR of Long baselines is realized based on pulse code is additionally provided, including
Following steps:
Transmitting uses two transmission channels, including A transmission channel and B transmission channel, and two transmission channels emit tool simultaneously
There are two kinds of multiple-pulse groups of different continuous impulse codings；
A receiving antenna and B receiving antenna in the transmitting gap of continuous impulse code set while receiving radar echo signal；
Two-way receives the carry out phase shift coding all the way in signal, and signal combining is then received with another way, and formation connects all the way
The collection of letters number；
The signal of reception all the way formed enters single-channel receiver, changes to form radar return data through digital-to-analogue；
Distance is carried out to echo data to handle to resolving, restores two kinds of radars of the isolated different transmission channels of correspondence
Echo data；
Again orientation resolving processing is carried out to the radar return data of different transmission channels respectively, it is corresponding different to restore separation
The radar return data of receiving channel, obtain two kinds of transmission channels and receiving channel combination radar return data, i.e. A send out A receive,
B sends out B and receives two kinds of interference SAR echo datas；
SAR imaging and interference processing are carried out to interference SAR echo data, obtain InSAR elevation map.
Wherein, two transmission channels emit two kinds of multiple-pulse groups with different pulse codes simultaneously, in signal transmitting,
Two kinds of multiple-pulse groups are not overlapped in time.
Two-way receives the carry out phase shift coding all the way in signal, is the encoded interval to reception signal all the way by pulse group,
Carry out phase code.
Again orientation resolving processing is carried out to the radar return data of different transmission channels respectively, different subspace will be located at
The radar signal of corresponding different receiving channels is separately separated out, restores the radar return number for obtaining representing different receiving channels
According to.
Second embodiment:
In the present embodiment, a kind of system that the synchronous interference SAR of Long baselines is realized based on pulse code is provided.Such as Fig. 7
Shown, compared with the system for realizing the synchronous interference SAR of Long baselines based on pulse code of first embodiment, the present embodiment is based on arteries and veins
Punching coding realizes that the difference of the system of the synchronous interference SAR of Long baselines is: the present embodiment includes two phase shifters, respectively phase shift
Device one and phase shifter two, phase shifter a pair of A antenna receive signal carry out phase shift coding, phase shifter two to B antenna receive signal into
Row phase shift coding.Combiner phase shift is encoded after the signal of reception all the way and another way receive signal synthesis signal all the way.
When interference SAR receives, phase code is carried out for the reception signal of two receiving antennas, each antenna is with the 1st group
Continuous impulse code set and the 2nd group of continuous impulse coding composition coding cycle:
For the 1st group of continuous impulse code set, it is labeled as Ma pulse group；
For the 2nd group of continuous impulse code set, it is labeled as Mb pulse group；
The additive phase of Ma pulse group is 0；
The additive phase of Mb pulse group is π.
The reception signal absolute coding of two receiving antennas.When signal resolves recovery, to two kinds of different transmission channels
Radar return data carry out resolving processing respectively, and the radar signal for corresponding to different receiving channels positioned at different subspace is individually divided
It separates out and, restore the radar return data for obtaining representing different receiving channels.
In order to achieve the purpose that brief description, any technical characteristic narration for making same application in above-mentioned first embodiment
All and in this, without repeating identical narration.
3rd embodiment:
In the present embodiment, a kind of system that the synchronous interference SAR of Long baselines is realized based on pulse code is provided.Such as Fig. 8
Shown, compared with the system for realizing the synchronous interference SAR of Long baselines based on pulse code of first embodiment, the present embodiment is based on arteries and veins
Punching coding realizes that the difference of the system of the synchronous interference SAR of Long baselines is: using a transmitter and a switching switch in place
Two transmitters pass through since A antenna transmitting coded pulse group and B antenna transmitting coded pulse group are staggered in time
Switching switch controls pumping signal module in time, the subpulse of transmitter output is separately sent to A antenna and B antenna, just
Two kinds of multiple-pulse groups may be implemented to emit in two antennas respectively.
In order to achieve the purpose that brief description, any technical characteristic narration for making same application in above-mentioned first embodiment
All and in this, without repeating identical narration.
Fourth embodiment:
In the present embodiment, a kind of system that the synchronous interference SAR of Long baselines is realized based on pulse code is provided.Such as Fig. 9
Shown, compared with the system for realizing the synchronous interference SAR of Long baselines based on pulse code of second embodiment, the present embodiment is based on arteries and veins
Punching coding realizes that the difference of the system of the synchronous interference SAR of Long baselines is: using a transmitter and a switching switch in place
Two transmitters pass through since A antenna transmitting coded pulse group and B antenna transmitting coded pulse group are staggered in time
Switching switch controls pumping signal module in time, the subpulse of transmitter output is separately sent to A antenna and B antenna, just
Two kinds of multiple-pulse groups may be implemented to emit in two antennas respectively.
In order to achieve the purpose that brief description, any technical characteristic narration for making same application in above-mentioned second embodiment
All and in this, without repeating identical narration.
It should be noted that above description is omitted for this field in order to be easier to understand embodiments of the present invention
Technical staff for be that well known or published and for embodiments of the present invention realizations are likely necessary
More specific some technical details.For example, above description be omitted to exomonental continuous impulse encode and resolve
Generality description.It should be understood that the implementation method of embodiment according to the present invention be only exemplary rather than it is restrictive.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
There should be clear understanding to the method for realizing the synchronous interference SAR of Long baselines the present invention is based on pulse code.Utilize the present invention
Multiple-pulse coding method, realize two antennas of interference SAR while emitting the transmitting signal of different continuous impulses coding, connecing
Time receiving receives the signal of corresponding transmitting while respective antenna, forms long interference baseline, and by connecing to different receiving antennas
A number progress continuous impulse coding of collecting mail remerges to be received for a receiving channel, in imaging process, using before
Transmitting coding and receive coding, resolve and isolate the radar signal in different channels, realize interference SAR imaging.
It should be noted that in attached drawing or specification text, the implementation for not being painted or describing is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, the above-mentioned definition to each element and method is simultaneously
It is not limited only to various specific structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can carry out letter to it
It singly changes or replaces.
Furthermore the word of ordinal number such as " first ", " second ", " third " etc. used in specification and claim,
To modify corresponding element, itself simultaneously unexpectedly contains and represents the element and have any ordinal number, does not also represent a certain element and another
The sequence or the sequence in manufacturing method of one element, the use of those ordinal numbers are only used to obtain the element with certain name
Clear differentiation can be made with another element with identical name.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (8)
1. a kind of method for realizing the synchronous interference SAR of Long baselines based on pulse code, which comprises the following steps:
Transmitting uses two transmission channels, including A transmission channel and B transmission channel, and two transmission channels emit simultaneously to be had not
With two kinds of multiple-pulse groups of continuous impulse coding；Or transmitting uses a transmitter and two emitting antennas, including A transmitting antenna
With B transmitting antenna, two emitting antennas switching transmitting has two kinds of multiple-pulse groups of different continuous impulses coding；
A receiving antenna and B receiving antenna in the transmitting gap of continuous impulse code set while receiving radar echo signal；
Two-way receives the carry out phase shift coding all the way in signal, and signal combining is then received with another way, is formed and receives letter all the way
Number；Or two-way receives signal and carries out phase shift coding respectively, is then combined, formation receives signal all the way；
The signal of reception all the way formed enters single-channel receiver, changes to form radar return data through digital-to-analogue；
Distance is carried out to echo data to handle to resolving, restores two kinds of radar returns of the isolated different transmission channels of correspondence
Data；
Again orientation resolving processing is carried out to the radar return data of different transmission channels respectively, restores the corresponding different receptions of separation
The radar return data in channel obtain the radar return data of two kinds of transmission channels and receiving channel combination, i.e. A sends out A receipts, B sends out B
Receive two kinds of interference SAR echo datas；
SAR imaging and interference processing are carried out to interference SAR echo data, obtain InSAR elevation map.
2. the method according to claim 1, wherein described two transmission channels emit simultaneously has different pulses
Two kinds of multiple-pulse groups of coding, in signal transmitting, two kinds of multiple-pulse groups are not overlapped in time.
3. the method according to claim 1, wherein the two-way receives the carry out phase shift volume all the way in signal
Code is to carry out phase code to signal is received all the way by the encoded interval of pulse group.
4. being the method according to claim 1, wherein the two-way receives signal carries out phase shift coding respectively
The encoded interval that signal presses pulse group is received to two-way, carries out phase code respectively.
5. the method according to claim 1, wherein described again to the radar return data of different transmission channels point
Not carry out orientation resolving processing, different subspace will be located at correspond to the radar signals of different receiving channels and be separately separated out,
Recovery obtains representing the radar return data of different receiving channels.
6. a kind of system for realizing the synchronous interference SAR of Long baselines based on pulse code characterized by comprising
Pumping signal module, it is defeated respectively for generating two kinds of multiple-pulse groups for using subband alternation sum time interleaving to be encoded
Enter to the first transmitter and the second transmitter；
First transmitter and the second transmitter for amplifying two kinds of multiple-pulse groups, and are output to A days by two circulators respectively
Line and B antenna；
A antenna receives echo-signal and B antenna transmitting letter that A antenna transmitting signal generates for emitting A antenna encoded signal
Number generate echo-signal；
B antenna receives echo-signal and B antenna transmitting letter that A antenna transmitting signal generates for emitting B antenna encoded signal
Number generate echo-signal；
Phase shifter, for receiving signal or B antenna reception signal progress phase shift coding to the A antenna by circulator；
Combiner, for by after the coding of phase shift all the way reception signal and another way receive signal synthesis signal all the way；
Receiver, for receiving the reception signal after being combined；
Data acquisition module, for being digitized to the signal that receiver exports；
Imaging and interference processing module, for carrying out signal recovery processing, imaging and interference to radar return data
Processing；Signal recovery processing includes carrying out distance to radar return data to handle to resolving, and it is logical to restore the corresponding different transmittings of separation
The radar return data in road, then orientation resolving processing is carried out respectively to the radar return data of different transmission channels, restore to divide
The radar return data of receiving channels different from correspondence obtain the radar return number of two kinds of transmission channels and receiving channel combination
According to i.e. A sends out two kinds of interference SAR echo datas that A is received, B hair B is received；SAR imaging is carried out to interference SAR echo data and is done
Processing is related to, InSAR elevation map is obtained.
7. system according to claim 6, which is characterized in that replace a phase shifter using two phase shifters, respectively
First phase shifter and the second phase shifter, the first phase shifter receive signal to A antenna and carry out phase shift coding, and the second phase shifter was to B days
Line receives signal and carries out phase shift coding；
Combiner phase shift is encoded after the signal of reception all the way and another way receive signal synthesis signal all the way.
8. system according to claim 6 or 7, which is characterized in that use a transmitter and a switching switch in place
Two transmitters pass through since A antenna transmitting coded pulse group and B antenna transmitting coded pulse group are staggered in time
Switching switch controls pumping signal module in time, the subpulse of transmitter output is separately sent to A antenna and B antenna, real
Existing two kinds of multiple-pulse groups emit in two antennas respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112346058A (en) * | 2020-10-30 | 2021-02-09 | 西安电子科技大学 | Imaging method for improving signal-to-noise ratio of high-speed SAR platform based on continuous pulse coding |
| CN113111758A (en) * | 2021-04-06 | 2021-07-13 | 中山大学 | SAR image ship target identification method based on pulse neural network |
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