CN108037504A - A kind of method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets - Google Patents

A kind of method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets Download PDF

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CN108037504A
CN108037504A CN201711213866.0A CN201711213866A CN108037504A CN 108037504 A CN108037504 A CN 108037504A CN 201711213866 A CN201711213866 A CN 201711213866A CN 108037504 A CN108037504 A CN 108037504A
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correction
represent
reference target
polarization
synthetic aperture
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陈锟山
杨晓峰
王苏芸
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Institute of Remote Sensing and Digital Earth of CAS
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Institute of Remote Sensing and Digital Earth of CAS
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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
    • G01S13/9076—Polarimetric features in SAR
    • 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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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a kind of method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets, this method passes through trihedral corner reflector, Dihedral Corner Reflectors and three point targets for rotating 22.5 degree of Dihedral Corner Reflectors, according to target actual measurement correction matrix is obtained with theoretical collision matrix, then the echo data of polarimetric synthetic aperture radar is corrected using correction matrix, so as to be corrected to the amplitude between each POLARIZATION CHANNEL of polarimetric synthetic aperture radar with unbalance in phase and crosstalk.The method of the present invention correction process process is simple, highly practical, cost is low, precision is high, easily operated, it is not need to rely on the priori of imaging region, and system performance is not required to do it is any it is assumed that available under laboratory environment and wild environment to the polarization correction of polarimetric synthetic aperture radar system.

Description

A kind of polarimetric synthetic aperture radar rapid polarization correction based on three point targets Method
Technical field
The present invention relates to a kind of polarimetric synthetic aperture radar, more particularly, refer to a kind of based on three point targets The method of polarimetric synthetic aperture radar rapid polarization correction.The method of the present invention can be realized each to polarimetric synthetic aperture radar The correction of the imbalance and crosstalk of amplitude and phase between POLARIZATION CHANNEL, it is true to be extracted from the amplitude and phase after correction Real, accurate target polarization scattering characteristics.
Background technology
Synthetic aperture radar (Synthetic Aperture Radar, SAR) is a kind of round-the-clock, round-the-clock active Information Acquisition System.As shown in Figure 1, the full chain-circuit system of synthetic aperture radar can be divided into three parts, i.e. radar carrier is put down Echo data fetching portion, space segment TCP data segment and ground segment data processing section on platform.Synthetic aperture radar System obtains synthetic aperture radar raw radar data by transmitting and return pulse signal.
Polarimetric synthetic aperture radar combines the advantages of high-resolution imaging technology and Polarimetry, to ground object target The physical features such as shape, direction, structure, texture have high susceptibility, and abundant polarization information can be used for the pole for portraying target Change scattering properties, in agriculture large area terrain classification, forest species identification, geologic structure description, soil moisture estimation, sea ice inspection Survey, oceanography and military target detection have a wide range of applications with fields such as identifications.However, in actual polarization measurement process In, polarimetric synthetic aperture radar system is vulnerable to amplitude and unbalance in phase and the influence of crosstalk between each polarization so that The data that polarimetric synthetic aperture radar obtains can not reflect target property and scattering mechanism, therefore, polarization correction exactly It is the premise and basis that polarimetric radar accurately obtains target polarization scattering characteristics.
The polarization correction technology of polarimetric synthetic aperture radar can realize that polarimetric synthetic aperture radar is " quantitative " over the ground and see Survey, reduce the real polarization scattering characteristics of target, there is important reality and engineering significance.
The content of the invention
Made to solve the amplitude in polarimetric synthetic aperture radar between each POLARIZATION CHANNEL with unbalance in phase and crosstalk Into echo-signal distortion, the present invention propose a kind of polarimetric synthetic aperture radar rapid polarization school based on three point targets Positive method.This method is by trihedral corner reflector, Dihedral Corner Reflectors and rotates three of 22.5 degree of Dihedral Corner Reflectors Point target, is obtained correction matrix with theoretical collision matrix according to target actual measurement, then complete polarization is synthesized using correction matrix The echo data of aperture radar is corrected, so as to amplitude and phase between each POLARIZATION CHANNEL of polarimetric synthetic aperture radar Uneven and crosstalk is corrected.The method of the present invention correction process process is simple, highly practical, cost is low, precision is high, is easy to grasp Make, it is not necessary to be not required to do any it is assumed that can be used for laboratory environment dependent on the priori of imaging region, and to system performance With under wild environment to the polarization correction of polarimetric synthetic aperture radar system.
The present invention is a kind of method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets, is polarized Correction is completed in SAR signal processors, and the polarization correction step is as follows：
Step 1, launches according to polarimetric synthetic aperture radar and receives model, amplitude and phase between clearly each polarization Echo-signal distortion effect caused by position imbalance and crosstalk, the actual measurement collision matrix for establishing reference target respectively are scattered with theoretical Matrix；
The theoretical collision matrix of the polarimetric synthetic aperture radar is
The actual measurement collision matrix of the reference target is
Step 2, using transmitting and interchannel crosstalk and amplitude and unbalance in phase caused by receive process distortion, a side Face builds correction matrix, on the other hand establishes the relational model of the actual measurement collision matrix and theoretical collision matrix of reference target；
The correction matrix is
Actual measurement and the relational model of theory after the correction are
In step 3, the actual measurement after correction and theoretical relational model are utilized
Carry out amplitude and phase between each POLARIZATION CHANNEL Imbalance and crosstalk correction, obtain the collision matrix S after target correctiona=C-1Sm, SmRepresent target actual measurement collision matrix； C-1Represent the inverse matrix of correction matrix C.
A kind of the advantages of method of polarimetric synthetic aperture radar rapid polarization correction based on three point targets of the present invention It is：
1. the present invention utilizes 22.5 degree of trihedral corner reflector, Dihedral Corner Reflectors and rotation Dihedral Corner Reflectors this three The scattering properties of point target, as with reference to target so that the scattering properties of adjuster is known and controllable, it is not necessary to dependent on imaging The priori in region.
2. application target actual measurement collision matrix of the present invention obtains correction matrix with theoretical collision matrix, biography has been taken into full account Among defeated and receive process, due to echo-signal distortion shadow caused by the amplitude between each polarization and unbalance in phase and crosstalk etc. Ring.
On the one hand 3. the correction matrix of the present invention is obtained using a trihedral corner reflector and a Dihedral Corner Reflectors Six unknown quantitys relevant with same polarization；On the other hand it is relevant to obtain cross polarization using 22.5 degree of Dihedral Corner Reflectors Two unknown quantitys；Do not contain hypothesis parameter to the processing of the echo data of polarimetric synthetic aperture radar, correction process process is simple, Strong applicability, cost are low, precision is high.
4. the present invention can provide four equations of complete polarization using 22.5 degree of Dihedral Corner Reflectors, and can provide same Polarization and cross-polarized relation.
5. the method for the present invention realizes the polarization correction of polarimetric synthetic aperture radar, not only meet that polarization correction precision will Ask and meet the requirement for correcting efficiency.Correction error is wanted completely within zone of reasonableness far above polarization correction precision Ask, disclosure satisfy that the polarization correction required precision of following relationship type polarimetric synthetic aperture radar.
Brief description of the drawings
Fig. 1 is the structure diagram of conventional synthesis aperture radar.
Fig. 2 is the flow chart of polarimetric synthetic aperture radar rapid polarization correction of the present invention based on three point targets.
Fig. 3 A are the co polarization diagrams of synthetic aperture radar raw radar data.
Fig. 3 B are the co polarization diagrams using the echo data after polarization correction of the present invention.
Fig. 3 C are the cross polarization diagrams of synthetic aperture radar raw radar data.
Fig. 3 D are the cross polarization diagrams using the echo data after polarization correction of the present invention.
Embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
The method conduct of polarimetric synthetic aperture radar rapid polarization correction proposed by the present invention based on three point targets The correction means of target echo data, are embedded in SAR signal processors as shown in Figure 1.It can complete complete polarization synthesis hole The correction of the imbalance and crosstalk of amplitude and phase between each POLARIZATION CHANNEL of footpath radar, to from the amplitude and phase after correction Extract true, accurate target polarization scattering characteristics.In the present invention, launched according to polarimetric synthetic aperture radar and receive mould The distortion effect such as type, amplitude and unbalance in phase and crosstalk between clearly each polarization, establishes target actual measurement and theoretical scattering square Relation between battle array；Selection and combined reference target (i.e. 22.5 degree of two trihedral corner reflector, Dihedral Corner Reflectors and rotation face The scattering properties of this three point targets of corner reflector, as with reference to target), utilize actual measurement and the theoretical collision matrix of reference target Relation, solve correction matrix；Using correction matrix go correction polarimetric synthetic aperture radar respectively polarization between amplitude and phase Imbalance and crosstalk.
A kind of method of polarimetric synthetic aperture radar rapid polarization correction based on three point targets of the present invention, the party Method includes the following steps：
Step 1, launches according to polarimetric synthetic aperture radar and receives model, amplitude and phase between clearly each polarization Echo-signal distortion effect caused by position imbalance and crosstalk, the actual measurement collision matrix for establishing reference target respectively are scattered with theoretical Matrix；
The theoretical collision matrix of the polarimetric synthetic aperture radar is
The actual measurement collision matrix of the reference target is
In step 1, the theoretical collision matrix of reference target is built；
Polarimetric synthetic aperture radar image is using different polarization mode alternate emissions and receives radar signal, so that full pole Abundant reference target (also referred to as ground object target) scattering properties can be obtained by being combined to aperture radar, comprising earth's surface object not The information of same polarization amplitude and phase, in order to which the information being included in polarimetric synthetic aperture radar image, analysis is fully utilized Correlation between different passages, polarization, also just needs to establish the theoretical collision matrix of polarimetric synthetic aperture radar, so as to The follow-up polarization correction for carrying out polarimetric synthetic aperture radar, and then the quantitative information of ground object target is obtained, it is more deeply comprehensive Understanding reference target feature and its spatial and temporal variation.
In the present invention, the theoretical collision matrix of polarimetric synthetic aperture radar, is denoted as S.
Subscript hh represents the horizontal identification number received of horizontal emission；Subscript hv represents the mark of horizontal emission vertical reception Knowledge number；Subscript vh represents the horizontal identification number received of Vertical Launch；Subscript vv represents the mark of Vertical Launch vertical reception Number.ShhRepresent the horizontal theoretical Echo Rating received of horizontal emission；ShvRepresent the theoretical Echo Rating of horizontal emission vertical reception；Svh Represent the horizontal theoretical Echo Rating received of Vertical Launch；SvvRepresent the theoretical Echo Rating of Vertical Launch vertical reception.
In the present invention according to formula (1), the theoretical collision matrix for reference target can be obtained, is denoted as Si。
Represent the horizontal theoretical Echo Rating received of horizontal emission of reference target；Superscript i representation theory scattering values Identification number；Represent the theoretical Echo Rating of the horizontal emission vertical reception of reference target；Represent the vertical hair of reference target Jetting flushes the theoretical Echo Rating of receipts；Represent the theoretical Echo Rating of the Vertical Launch vertical reception of reference target.
In step 1, the actual measurement collision matrix of reference target is built；
It is shown in Figure 1, offline echo data is extracted from SAR signal processors.Therefore complete polarization synthesis hole is utilized The echo data of footpath radar builds the actual measurement collision matrix of reference target, is denoted as Sm。
Represent the Echo Rating that reference target measured level emission level receives；Superscript m represents the mark of actual measurement scattering value Knowledge number；Represent the Echo Rating of reference target measured level transmitting vertical reception；Represent reference target actual measurement Vertical Launch The Echo Rating that level receives；Represent the Echo Rating of reference target actual measurement Vertical Launch vertical reception.
In the present invention, by the actual measurement collision matrix S of reference targetmWith theoretical collision matrix SiIt is combined, takes into full account Model is launched and received to polarimetric synthetic aperture radar, caused by the amplitude between clearly each polarization and unbalance in phase and crosstalk Echo-signal distortion effect.
Step 2, using transmitting and interchannel crosstalk and amplitude and unbalance in phase caused by receive process distortion, a side Face builds correction matrix, on the other hand establishes the relational model of the actual measurement collision matrix and theoretical collision matrix of reference target；
The correction matrix is
Actual measurement and the relational model of theory after the correction are
In the present invention, the theoretical collision matrix S of reference targetiTo be subject to respectively to be polarized in transmitting procedure in actual measurement and connect Distortion effect during receipts.The polarization correction of polarimetric synthetic aperture radar is just to determine these distortion effects, so as to from ginseng Examine the actual measurement collision matrix S of targetmMiddle disappearance distortion effect, reduces the true scattering signatures of reference target.Therefore the reality of structure It is formula (4) to survey with theoretical relational model：
RhhRepresent the horizontal amount of unbalance received of distortion matrix horizontal emission in receive process；
RhvRepresent the amount of crosstalk of the distortion matrix horizontal emission vertical reception in receive process；
RvhRepresent the horizontal amount of crosstalk received of distortion matrix Vertical Launch in receive process；
RvvRepresent the amount of unbalance of the distortion matrix Vertical Launch vertical reception in receive process；
ThhRepresent the horizontal amount of unbalance received of distortion matrix horizontal emission in transmitting procedure；
ThvRepresent the amount of crosstalk of the distortion matrix horizontal emission vertical reception in transmitting procedure；
TvhRepresent the horizontal amount of crosstalk received of distortion matrix Vertical Launch in transmitting procedure；
TvvRepresent the amount of unbalance of the distortion matrix Vertical Launch vertical reception in transmitting procedure；
In the present invention, it will survey and quantified with the amount of crosstalk in theoretical relational model with amount of unbalance, obtain school Positive matrices, is denoted as C：
c11Represent TvvAnd RvvAmount；c12Represent ThvAnd RvhAmount；c13Represent ThvAnd RvvAmount；c14Represent TvvAnd Rvh's Amount；c21Represent TvhAnd RhvAmount；c22Represent ThhAnd RhhAmount；c23Represent ThhAnd RhvAmount；c24Represent TvhAnd RhhAmount；c31 Represent TvhAnd RvvAmount；c32Represent ThhAnd RvhAmount；c33Represent ThhAnd RvvAmount；c34Represent TvhAnd RvhAmount；c41Represent TvvAnd RhvAmount；c42Represent ThvAnd RhhAmount；c43Represent ThvAnd RhvAmount；c44Represent TvvAnd RhhAmount.
Correction matrix C is substituted into formula (4), is obtained：
In the present invention, eight unknown numbers of correction matrix C, at least need eight independent equations to solve.Wherein There are six unknown number (c11,c22,c31,c32,c41,c42), two unknown number (cs related with the same polarization of reference target33,c44) with The cross polarization of reference target is related.Therefore six equations related with same polarization, two sides related with cross polarization are needed Journey, but a reference target can only provide four equations, so we need two independences and are capable of providing like-polarized target Thing, one is capable of providing cross-polarized object.In polarization correction, Dihedral Corner Reflectors and trihedral corner reflector often by with Make reference target, because they have enough Radar Cross Sections and the wave beam wide.
Wherein Dihedral Corner Reflectors and trihedral corner reflector can provide two equations relevant with same polarization respectively, rotation 22.5 degree of Dihedral Corner Reflectors can provide four equations of complete polarization, and can provide same polarization and cross-polarized pass System.In the present invention, Dihedral Corner Reflectors are rotated to the Dihedral Corner Reflectors after 22.5 degree of angles to be known as rotating 22.5 degree Dihedral Corner Reflectors.
Therefore a trihedral corner reflector and a Dihedral Corner Reflectors are selected to solve c11,c22,c31,c32,c41, c42, but c can be solved by rotating 22.5 degree of Dihedral Corner Reflectors33,c44, but due to only 22.5 degree of dihedral angle reflections of rotation Device can provide same polarization and cross-polarized relation, therefore 22.5 degree of Dihedral Corner Reflectors are the necessary item in polarization correction.
Abbreviation formula (6), actual measurement and theoretical relational model, i.e. formula (7) after being corrected：
Superscript ref_1 represents the identification number of trihedral corner reflector, and superscript ref_2 represents the mark of Dihedral Corner Reflectors Number, superscript ref_3 represents the identification number of 22.5 degree of Dihedral Corner Reflectors of rotation.
Represent the Echo Rating that the reference target measured level emission level of trihedral corner reflector output receives；
Represent the Echo Rating that the reference target measured level emission level of Dihedral Corner Reflectors output receives；
Represent the Echo Rating of the reference target measured level transmitting vertical reception of trihedral corner reflector output；
Represent the Echo Rating of the reference target measured level transmitting vertical reception of Dihedral Corner Reflectors output；
The reference target measured level for representing to rotate 22.5 degree of Dihedral Corner Reflectors outputs launches vertical reception Echo Rating；
Represent the horizontal Echo Rating received of reference target actual measurement Vertical Launch of trihedral corner reflector output；
Represent the horizontal Echo Rating received of reference target actual measurement Vertical Launch of Dihedral Corner Reflectors output；
Represent what the reference target actual measurement Vertical Launch level for rotating 22.5 degree of Dihedral Corner Reflectors outputs received Echo Rating；
Represent the Echo Rating of the reference target actual measurement Vertical Launch vertical reception of trihedral corner reflector output.
Represent the Echo Rating of the reference target actual measurement Vertical Launch vertical reception of Dihedral Corner Reflectors output.
In step 3, amplitude and phase between the actual measurement after correction and theoretical each POLARIZATION CHANNEL of relational model progress are utilized The imbalance of position and the correction of crosstalk, obtain the collision matrix after target correction；
In the present invention, the echo data obtained is removed in correction polarimetric synthetic aperture radar using formula (7), obtains mesh Collision matrix after calibration just, is denoted as Sa。
Sa=C-1Sm (8)
SmRepresent target actual measurement collision matrix；C-1Represent the inverse matrix of correction matrix C；SaTarget after representing calibrated dissipates Penetrate matrix.
Embodiment 1
Advantages of the present invention is verified below by the processing example of real data.
Example 1:On April 10th, 2000, the airborne Pi-SAR full polarimetric SAR datas of L-band.
Using Japanese aerospace research institution (Japan Aerospace Exploration Agency, JAXA) and state Family Intelligence Newsletter mechanism (National Institute of Information and Communications Technology, NICT) it is complete in the airborne Pi-SAR of L-band that Ribenniaoqu County Sand dune Region obtains on April 10th, 2000 Polarization data, applicability of the verification the method on polarimetric synthetic aperture radar echo data.In imaging region, taken in bird Eight reference targets have been set up on sand dune, have been specially four trihedral corner reflectors, two Dihedral Corner Reflectors, a rotation 22.5 Spend 45 degree of Dihedral Corner Reflectors of Dihedral Corner Reflectors and a rotation.SAR signal processors extract angle from raw radar data The collision matrix of reflector, utilizes one of trihedral corner reflector, a Dihedral Corner Reflectors and 22.5 degree of two faces Corner reflector is reference target, and correction matrix C is obtained according to the flow of Fig. 2, using this correction matrix, removes correction Pi-SAR images Collision matrix.Known by experiment, mesh can be correctly described after the collision matrix of Pi-SAR images is calibrated in the present embodiment Target polarization scattering characteristics, demonstrate the applicability of method.
In embodiment 1, the replacement that formula (9), formula (10) and formula (11) carry out reference target theory collision matrix value is quoted.
SDiRepresent the theoretical collision matrix of Dihedral Corner Reflectors, subscript DiFor the mark of Dihedral Corner Reflectors；STriRepresent The theoretical collision matrix of trihedral corner reflector, subscript TriFor the mark of trihedral corner reflector；SRotRepresent 22.5 degree of two face of rotation The theoretical collision matrix of corner reflector, subscript Rot are the mark of 22.5 degree of Dihedral Corner Reflectors of rotation.
Represent the horizontal theoretical Echo Rating received of horizontal emission of the reference target in Dihedral Corner Reflectors；Table Show the theoretical Echo Rating of horizontal emission vertical reception of the reference target in Dihedral Corner Reflectors；Represent reference target two The horizontal theoretical Echo Rating received of Vertical Launch in face angle reflector；Represent reference target in Dihedral Corner Reflectors The theoretical Echo Rating of Vertical Launch vertical reception.
Represent the horizontal theoretical Echo Rating received of horizontal emission of the reference target in trihedral corner reflector；Table Show the theoretical Echo Rating of horizontal emission vertical reception of the reference target in trihedral corner reflector；Represent reference target three The horizontal theoretical Echo Rating received of Vertical Launch in face angle reflector；Represent reference target in trihedral corner reflector The theoretical Echo Rating of Vertical Launch vertical reception.
Represent that the horizontal theory received of horizontal emission of the reference target in 22.5 degree of Dihedral Corner Reflectors are rotated is returned Wave number；Represent the theoretical echo of horizontal emission vertical reception of the reference target in 22.5 degree of Dihedral Corner Reflectors are rotated Value；Represent the horizontal theoretical Echo Rating received of Vertical Launch of the reference target in 22.5 degree of Dihedral Corner Reflectors are rotated；Represent the theoretical Echo Rating of Vertical Launch vertical reception of the reference target in 22.5 degree of Dihedral Corner Reflectors are rotated.
In the present invention, SDiNumeric reference " Calibration of Spaceborne CTLR CompactPolarimetric Low-Frequency SARUsing Mixed Radar Calibrators ", page 2713, IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,VOL.49,NO.7,JULY 2011。STri And SRotNumeric reference " Polarimetric Calibration Experiment of ALOSPALSAR with Polarization-Selective Dihedrals ", page 1596,2007IEEE.
The actual measurement collision matrix of reference target is obtained by airborne Pi-SAR in the present invention, and result is explained in embodiment To release, the airborne Pi-SAR polarimetric synthetic aperture radars image capturing time is on October 4th, 2000, and research area takes for the day island proper, Flying height is 8000 meters, and incidence angle is fixed as 53 degree, and it is four trihedral corner reflectors, two to study the reference target set up in area 45 degree of a Dihedral Corner Reflectors, 22.5 degree of Dihedral Corner Reflectors of rotation and a rotation Dihedral Corner Reflectors.Present invention choosing It is with reference to mesh to take 22.5 degree of one of trihedral corner reflector, a Dihedral Corner Reflectors and a rotation Dihedral Corner Reflectors Mark, 45 degree of Dihedral Corner Reflectors of one of trihedral corner reflector and a rotation are target to be corrected.
Referring to shown in Fig. 3 A, Fig. 3 B, Fig. 3 C, Fig. 3 D, the polarization response front and rear using trihedral corner reflector correction is used as inspection Correct result example, before correction the polarization response of trihedral corner reflector due between each polarization channel imbalance and crosstalk cause to turn round Song, the polarization response of trihedral corner reflector is consistent with theoretical polarization response after correction.
Embodiment 2
Example 2：Point target is emulated using moment method (Method of Moments, MOM).One of trihedral angle reflection Device, for 22.5 degree of dihedral angle transmitters of a Dihedral Corner Reflectors and a rotation as target is referred to, setting frequency is 5.3GHz, Size is 56cm, and 37 degree of incidence angle, actual measurement collision matrix and theoretical collision matrix based on point target, are obtained according to the flow of Fig. 2 Correction matrix C is taken, using this correction matrix, goes correction point target.Known by experiment, point target is emulated in the present embodiment through school Error demonstrates the applicability of method completely within zone of reasonableness after just.
The present invention is a kind of method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets, be for The amplitude in polarimetric synthetic aperture radar between each POLARIZATION CHANNEL is solved with echo caused by unbalance in phase and crosstalk to believe The technical problem of number distortion, seven inventive methods pass through 22.5 degree of trihedral corner reflector, Dihedral Corner Reflectors and rotation dihedral angles Three point targets of reflector, obtain correction matrix with theoretical collision matrix according to target actual measurement, then utilize correction matrix The echo data of polarimetric synthetic aperture radar is corrected, so that between each POLARIZATION CHANNEL of polarimetric synthetic aperture radar Amplitude be corrected with unbalance in phase and crosstalk.So as to fulfill the polarization correction to polarimetric synthetic aperture radar system.

Claims (4)

  1. A kind of 1. method of the polarimetric synthetic aperture radar rapid polarization correction based on three point targets, it is characterised in that including There is following polarization correction step：
    Step 1, according to polarimetric synthetic aperture radar transmitting and receives model, and the amplitude and phase between clearly each polarization are not Echo-signal distortion effect caused by balance and crosstalk, establishes the actual measurement collision matrix of reference target and theoretical scattering square respectively Battle array；
    The theoretical collision matrix of the polarimetric synthetic aperture radar is
    The actual measurement collision matrix of the reference target is
    Step 2, using transmitting and interchannel crosstalk and amplitude and unbalance in phase caused by receive process distortion, one side structure Positive matrices for school building, on the other hand establishes the relational model of the actual measurement collision matrix and theoretical collision matrix of reference target；
    The correction matrix is
    Actual measurement and the relational model of theory after the correction are
    Superscript ref_1 represents the identification number of trihedral corner reflector, and superscript ref_2 represents the identification number of Dihedral Corner Reflectors, Superscript ref_3 represents the identification number of 22.5 degree of Dihedral Corner Reflectors of rotation；
    Represent the Echo Rating that the reference target measured level emission level of trihedral corner reflector output receives；
    Represent the Echo Rating that the reference target measured level emission level of Dihedral Corner Reflectors output receives；
    Represent the Echo Rating of the reference target measured level transmitting vertical reception of trihedral corner reflector output；
    Represent the Echo Rating of the reference target measured level transmitting vertical reception of Dihedral Corner Reflectors output；
    Represent that the reference target measured level for rotating 22.5 degree of Dihedral Corner Reflectors outputs launches the echo of vertical reception Value；
    Represent the horizontal Echo Rating received of reference target actual measurement Vertical Launch of trihedral corner reflector output；
    Represent the horizontal Echo Rating received of reference target actual measurement Vertical Launch of Dihedral Corner Reflectors output；
    Represent to rotate the echo that the reference target actual measurement Vertical Launch level of 22.5 degree of Dihedral Corner Reflectors outputs receives Value；
    Represent the Echo Rating of the reference target actual measurement Vertical Launch vertical reception of trihedral corner reflector output；
    Represent the Echo Rating of the reference target actual measurement Vertical Launch vertical reception of Dihedral Corner Reflectors output；
    In step 3, the actual measurement after correction and theoretical relational model are utilized
    Carry out amplitude and phase between each POLARIZATION CHANNEL Uneven and crosstalk correction, obtains the collision matrix S after target correctiona=C-1Sm, SmRepresent target actual measurement collision matrix；C-1 Represent the inverse matrix of correction matrix C.
  2. 2. the side of the polarimetric synthetic aperture radar rapid polarization correction according to claim 1 based on three point targets Method, it is characterised in that：Polarization correction is completed in SAR signal processors.
  3. 3. the side of the polarimetric synthetic aperture radar rapid polarization correction according to claim 2 based on three point targets Method, it is characterised in that：SAR signal processors extract the collision matrix of corner reflector from raw radar data, and the angle is anti- Emitter refers to a trihedral corner reflector, a Dihedral Corner Reflectors and 22.5 degree of Dihedral Corner Reflectors.
  4. What 4. the polarimetric synthetic aperture radar rapid polarization based on three point targets according to claim 1 or 3 corrected Method, it is characterised in that：The reference target theory collision matrix value that polarization correction uses is respectively the theory of Dihedral Corner Reflectors Collision matrixThe theoretical collision matrix of trihedral corner reflectorWith 22.5 degree of two face of rotation The theoretical collision matrix of corner reflector
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN111948615A (en) * 2020-06-30 2020-11-17 中国资源卫星应用中心 Polarization calibration method and device for satellite-borne fully-polarized SAR data
CN115629552A (en) * 2022-03-18 2023-01-20 北京遥感设备研究所 Method and device for verifying main target identification full-link model of radio frequency detection system

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