CN110196424A - Airborne multichannel CSSAR ground moving object movement and location parameter estimation method - Google Patents
Airborne multichannel CSSAR ground moving object movement and location parameter estimation method Download PDFInfo
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Classifications
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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
- G01S13/9021—SAR image post-processing techniques
- G01S13/9023—SAR image post-processing techniques combined with interferometric techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S13/9021—SAR image post-processing techniques
- G01S13/9029—SAR image post-processing techniques specially adapted for moving target detection within a single SAR image or within multiple SAR images taken at the same time
-
- 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
- G01S13/9088—Circular SAR [CSAR, C-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
- G01S13/9094—Theoretical aspects
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- 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 present invention provides a kind of airborne multichannel CSSAR ground moving object movement and location parameter estimation methods, the ATI phase of the image area echo signal in adjacent two channel of multichannel CSSAR system is obtained first, based on ATI phase, estimated using iterative processing target along course speed, radial velocity and positive side apparent time carve target to radar distance.The present invention releases the coupling between target position parameter and kinematic parameter using an iterative processing, is able to achieve the accurate estimation to the parameters of target motion and location parameter, and the development for airborne multichannel CSSAR-GMTI system provides technical support.
Description
Technical field
The present invention relates to radar signal processing field, especially a kind of ground moving object movement and location parameter estimation side
Method.
Background technique
Airborne Circular test band synthetic aperture radar (Circular Stripmap Synthetic Aperture
Radar, CSSAR) have many advantages, such as that wide coverage and revisiting period are short, thus suitable for air to surface wide area scout and when
Quick target (such as ground moving object) monitoring.
It is airborne compared with conventional airborne straight path synthetic aperture radar (Synthetic Aperture Radar)
The circular motion profile of CSSAR causes the relative motion between radar and target more complicated, and causes to go through in target phase
Cheng Zhong, the movement of target and location parameter couple, this makes the movement of the ground moving object under airborne CSSAR and position ginseng
Also therefore number estimation is relatively difficult, and the target movement and location parameter estimation method suitable for conventional airborne straight path SAR
It cannot be used directly for airborne CSSAR.Therefore, there is an urgent need to study the accurate action reference variable side that can be used for airborne CSSAR
Method.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention for airborne multichannel CSSAR provide it is a kind of using target along course
The accurate ground moving object movement of interference (Along-Track Interferometry, ATI) phase and location parameter are estimated
Meter method.The present invention copes with the coupling between target movement and location parameter using an iterative processing.
The step of the technical solution adopted by the present invention to solve the technical problems are as follows:
Step 1, the ATI phase of the image area echo signal in adjacent two channel of multichannel CSSAR system is obtained；
Step 2, based on the ATI phase of the echo signal obtained in step 1, target is estimated using an iterative processing
Along course speed vta, radial velocity vtrAnd positive side apparent time carve target to radar distance Rb, detailed step are as follows:
(a) parameter initialization in iteration: n=1, Wherein, n indicates nth iteration,Indicate the
The v that n times iteration obtainstaEstimated value,Indicate the R that nth iteration obtainsbEstimated value, RbIt is located at radar positive side for target
Distance of the target to radar, R when apparent directionimgIndicate the distance of target in SAR image to coordinate,Indicate that nth iteration obtains
The r arrivedbEstimated value, rbFor target to the distance of coordinate origin, d is baseline length, λ when being located at radar positive side-looking direction for target
For wavelength, l2For the two-term coefficient of target range equation, M is target Doppler fuzzy number, and PRF is pulse recurrence frequency, h table
Show radar platform height, raIndicate that the flying radius of radar platform, α are an intermediate variable, ω is the movement angle of radar platform
Speed,Indicate the estimated value for the α that nth iteration obtains,
Indicate the v that nth iteration obtainstrEstimated value,For the ATI phase of echo signal；
(b) R when calculating nth iteration using following formulabAnd rbEstimated value:
(c) the orientation speed v of target when calculating nth iteration using following formulataEstimated value:
(d) estimated value of α when calculating nth iteration using following formula:
(e) distance of target is to speed v when calculating nth iteration using following formulatrEstimated value:
(f) compareWith the size of γ, ifMore than or equal to γ, then n is enabled to add 1, return step
(b), continue iteration, ifLess than γ, then iteration is terminated, enter step 3, wherein γ is a constant；
Step 3, it enablesObtain target along course speed, radial velocity and
Positive side apparent time carve target to radar distance estimated value, wherein vta,est、vtr,estAnd Rb,estRespectively vta、vtrAnd RbEstimate
Evaluation.
The beneficial effects of the present invention are released between target position parameter and kinematic parameter using an iterative processing
Coupling, be able to achieve the accurate estimation to the parameters of target motion and location parameter, the present invention can be airborne multichannel CSSAR-
The development of GMTI system provides technical support.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Fig. 2 is the flow diagram of iterative processing of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Step 1, the ATI phase of the image area echo signal in adjacent two channel of multichannel CSSAR system is obtained；
Step 2, based on the ATI phase of the echo signal obtained in step 1, target is estimated using an iterative processing
Along course speed vta, radial velocity vtrAnd positive side apparent time carve target to radar distance Rb, detailed step are as follows:
(a) parameter initialization in iteration: n=1, Wherein, n indicates nth iteration,Indicate the
The v that n times iteration obtainstaEstimated value,Indicate the R that nth iteration obtainsbEstimated value, RbIt is located at radar positive side for target
Distance of the target to radar, R when apparent directionimgIndicate the distance of target in SAR image to coordinate,Indicate that nth iteration obtains
The r arrivedbEstimated value, rbFor target to the distance of coordinate origin, d is baseline length, λ when being located at radar positive side-looking direction for target
For wavelength, l2For the two-term coefficient of target range equation, M is target Doppler fuzzy number, and PRF is pulse recurrence frequency, h table
Show radar platform height, raIndicate that the flying radius of radar platform, α are an intermediate variable, ω is the movement angle speed of radar platform
Degree,Indicate the estimated value for the α that nth iteration obtains,Table
Show the v that nth iteration obtainstrEstimated value,For the ATI phase of echo signal；
(b) R when calculating nth iteration using following formulabAnd rbEstimated value:
(c) the orientation speed v of target when calculating nth iteration using following formulataEstimated value:
(d) estimated value of α when calculating nth iteration using following formula:
(e) distance of target is to speed v when calculating nth iteration using following formulatrEstimated value:
(f) compareWith the size of γ, ifMore than or equal to γ, then n is enabled to add 1, return step
(b), continue iteration, ifLess than γ, then iteration is terminated, enter step 3, wherein γ is a constant；
Step 3, it enablesObtain target along course speed, radial velocity and
Positive side apparent time carve target to radar distance estimated value, wherein vta,est、vtr,estAnd Rb,estRespectively vta、vtrAnd RbEstimate
Evaluation.
Fig. 1 is flow diagram of the invention, and specific step is as follows for the embodiment of the present invention:
Step 1, the ATI phase of the image area echo signal in adjacent two channel of multichannel CSSAR system is obtained.
Echo signal S after i-th of channel Azimuth Compressioni,ac(tr,fa) may be expressed as:
Wherein, trFor apart from fast time, faFor orientation frequency (Doppler frequency), Wa,i() is orientation frequency envelope,
pr,i() is apart from envelope, and c is the light velocity, RbDistance of the target to radar, v when being located at radar positive side-looking direction for targettrTarget
Radial velocity, number M be target Doppler fuzzy number, PRF is pulse recurrence frequency, fcFor carrier frequency, tbIt is being located at radar just for target
The orientation moment of side-looking direction, d are baseline length, and λ is wavelength, Δ KaFor the frequency modulation rate of remaining orientation modulation.l2For target range
The secondary term system of equation, its expression formula areα is an intermediate variable, it
Expression formula is α=(vta-rbω)/Rb, vtaIt is target along course speed, rbTarget when being located at radar positive side-looking direction for target
To the distance of coordinate origin, ω is the movement angular frequency of radar platform.
According to formula (6), the ATI phase of the image area echo signal in adjacent two channelIt may be expressed as:
Step 2, based on the ATI phase of the target obtained in step 1, the edge boat of target is estimated using an iterative processing
To speed vta, radial velocity vtrAnd positive side apparent time carve target to radar distance Rb。
From formula (7) as can be seen that in the expression formula of target ATI phase, vta、vtrAnd RbThere are couplings.In order to overcome this
A coupling, realizes the accurate estimation to these parameters, and the present invention uses a kind of iterative processing strategy, detailed step are as follows:
(a) parameter initialization in iteration: n=1, Wherein, n indicates nth iteration,Indicate the
The v that n times iteration obtainstaEstimated value,Indicate the R that nth iteration obtainsbEstimated value, RimgIndicate mesh in SAR image
Target distance to coordinate,Indicate the r that nth iteration obtainsbEstimated value, h indicate radar platform
Highly, ra indicates the flying radius of radar platform,Indicate the estimated value for the α that nth iteration obtains,Indicate the v that nth iteration obtainstrEstimated value.
(b) expression formula according to target range envelope in formula (6), R when calculating nth iteration using following formulabAnd rb's
Estimated value:
(c) according to l2Expression formula, using following formula calculate nth iteration when vtaEstimated value:
(d) according to the expression formula of α, the estimated value of α when calculating nth iteration using following formula:
(e) expression formula according to target ATI phase in formula (7), v when calculating nth iteration using following formulatrEstimation
Value:
(f) compareWith the size of γ, ifMore than or equal to γ, then n=n+1, return step are enabled
2 (b), continue iteration.IfLess than γ, then iteration is terminated.Wherein γ is a constant, it is acceptable
vtrThe upper limit of evaluated error.In the present embodiment, its value is 10-8m/s.
Step 3, it enablesObtain target along course speed, radial velocity and
Positive side apparent time carve target to radar distance estimated value, wherein vta,est、vtr,estAnd Rb,estRespectively the present invention obtains
vta、 vtrAnd RbEstimated value.
Effect of the invention is further illustrated by following emulation experiment.
Airborne multichannel CSSAR system parameter is shown in Table 1, and the value that target component is shown in Table 2, γ is set as 10-8m/s.Table 3 provides
vta、vtrAnd RbEvaluated error result.
The airborne multichannel CSSAR system parameter of table 1
| Radar platform speed | 125m/s |
| Flying radius | 2.3km |
| Radar platform height | 8km |
| Carrier frequency | 10GHz |
| Transmitted signal bandwidth | 75MHz |
| Sample frequency | 100MHz |
| Pulse recurrence frequency | 1000Hz |
| Scene center distance | 16km |
| Baseline length | 0.12m |
2 target component of table
| vta(m/s) | vtr(m/s) | Rimg(km) | Rb(km) | l2 | m | |
| Target 1 | 15.00 | 1.73 | 16.00 | 15.96 | 3.32 | 0 |
| Target 2 | -3.00 | -5.20 | 16.00 | 16.00 | 3.45 | 0 |
| Target 3 | 7.00 | 15.60 | 16.01 | 16.04 | 3.38 | -1 |
3 evaluated error of table
From table 3 it can be seen that evaluated error all very littles, the evaluated error of vta is less than 0.01m/s, and the evaluated error of vtr is small
In 0.0001m/s, thus less than half Range resolution unit (distance resolution 1.5m) of evaluated error of Rb can illustrate this hair
Bright estimated accuracy is very high.
Claims (1)
1. a kind of airborne multichannel CSSAR ground moving object movement and location parameter estimation method, it is characterised in that including under
State step:
Step 1, the ATI phase of the image area echo signal in adjacent two channel of multichannel CSSAR system is obtained；
Step 2, based on the ATI phase of the echo signal obtained in step 1, the edge boat of target is estimated using an iterative processing
To speed vta, radial velocity vtrAnd positive side apparent time carve target to radar distance Rb, detailed step are as follows:
(a) parameter initialization in iteration: n=1, Wherein, n indicates nth iteration,Indicate the
The v that n times iteration obtainstaEstimated value,Indicate the R that nth iteration obtainsbEstimated value, RbIt is located at radar positive side for target
Distance of the target to radar, R when apparent directionimgIndicate the distance of target in SAR image to coordinate,Indicate that nth iteration obtains
The r arrivedbEstimated value, rbFor target to the distance of coordinate origin, d is baseline length, λ when being located at radar positive side-looking direction for target
For wavelength, l2For the two-term coefficient of target range equation, M is target Doppler fuzzy number, and PRF is pulse recurrence frequency, h table
Show radar platform height, raIndicate that the flying radius of radar platform, α are an intermediate variable, ω is the movement angle of radar platform
Speed,Indicate the estimated value for the α that nth iteration obtains,
Indicate the v that nth iteration obtainstrEstimated value,For the ATI phase of echo signal；
(b) R when calculating nth iteration using following formulabAnd rbEstimated value:
(c) the orientation speed v of target when calculating nth iteration using following formulataEstimated value:
(d) estimated value of α when calculating nth iteration using following formula:
(e) distance of target is to speed v when calculating nth iteration using following formulatrEstimated value:
(f) compareWith the size of γ, ifMore than or equal to γ, then n is enabled to add 1, return step (b), after
Continuous iteration, ifLess than γ, then iteration is terminated, enter step 3, wherein γ is a constant；
Step 3, it enablesTarget is obtained along course speed, radial velocity and positive side
Apparent time carve target to radar distance estimated value, wherein vta,est、vtr,estAnd Rb,estRespectively vta、vtrAnd RbEstimated value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115291213A (en) * | 2022-09-28 | 2022-11-04 | 中国电子科技集团公司第十四研究所 | Moving target azimuth velocity estimation method based on dual-beam SAR |
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| WO2010056159A1 (en) * | 2008-11-11 | 2010-05-20 | Saab Ab | Sar radar system |
| CN107271997A (en) * | 2017-06-05 | 2017-10-20 | 西北工业大学 | Airborne multichannel CSSAR ground moving object motion parameters estimation methods |
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| WO2010056159A1 (en) * | 2008-11-11 | 2010-05-20 | Saab Ab | Sar radar system |
| CN107271997A (en) * | 2017-06-05 | 2017-10-20 | 西北工业大学 | Airborne multichannel CSSAR ground moving object motion parameters estimation methods |
Non-Patent Citations (2)
| Title |
|---|
| YONGKANG LI ET AL.: ""A New Motion Parameter Estimation and Relocation Scheme for Airborne Three-Channel CSSAR-GMTI Systems"", 《IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115291213A (en) * | 2022-09-28 | 2022-11-04 | 中国电子科技集团公司第十四研究所 | Moving target azimuth velocity estimation method based on dual-beam SAR |
| CN115291213B (en) * | 2022-09-28 | 2022-12-20 | 中国电子科技集团公司第十四研究所 | Moving target azimuth velocity estimation method based on dual-beam SAR |
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