CN105527622B - For the layout method at single ground calibration station of GEOSAR phases calibration - Google Patents

For the layout method at single ground calibration station of GEOSAR phases calibration Download PDF

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Publication number
CN105527622B
CN105527622B CN201510988916.7A CN201510988916A CN105527622B CN 105527622 B CN105527622 B CN 105527622B CN 201510988916 A CN201510988916 A CN 201510988916A CN 105527622 B CN105527622 B CN 105527622B
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station
ground calibration
geosar
calibration station
single ground
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CN105527622A (en
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江冕
胡文龙
丁赤飚
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Institute of Electronics of CAS
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Institute of Electronics 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
    • G01S13/9058—Bistatic or multistatic 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/42—Diversity systems specially adapted for radar
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention belongs to satellite-borne synthetic aperture radar signal processing technology fields, geostationary orbit synthetic aperture radar (Geosynchronous Synthetic Aperture Radar are used for more particularly to one kind, GEOSAR) the layout method at single ground calibration station of phase calibration, the method includes：Choose the cloth station track at single ground calibration station for the calibration of GEOSAR phases；The rough site at the single ground calibration station of selection；Optimize the rough site at single ground calibration station.Using method proposed by the present invention, on the one hand pointedly solves the location problem at single ground calibration station of geostationary orbit SAR phase scaling systems；On the other hand the limited land resources in China be both rationally utilized, and had met the phase scaling requirements of the specific observed objects of GEOSAR, and reduce ground calibration station deployment cost, reduce the complexity of GEOSAR phase scaling systems.

Description

For the layout method at single ground calibration station of GEOSAR phases calibration
Technical field
The invention belongs to satellite-borne synthetic aperture radar signal processing technology fields, and in particular to one kind is used for GEOSAR phases The layout method at single ground calibration station of calibration.
Background technology
Geostationary orbit synthetic aperture radar (Geosynchronous Synthetic Aperture Radar, GEOSAR it is) using orbit altitude as satellite-borne SAR of the geostationary satellite of 36000km for platform, geostationary orbit SAR phases Calibration is a kind of technology obtained for GEOSAR echo motion compensation informations, by the accurately known ground calibration station in position, To GEOSAR satellite launch pulsed linear frequency modulation rate-aided signals, and the method that matched filter pulse is compressed is used from calibration echo Phase information is extracted in signal, accurate phase reference is provided for later stage imaging.The precision of GEOSAR phases calibration depends on Residual error, track motion measurement error, ground calibration station arrangement method etc. are corrected in equipment precision, atmospheric propagation disturbance.
GEOSAR phases scaling system is general mainly to establish ground calibration station at home, and ground calibration station is all distributed in north half Ball, ground calibration station are limited to the observation of GEOSAR satellites, ability of tracking, and unreasonable ground calibration station, which will be laid, to be influenced The precision of GEOSAR phases calibration.Therefore, it reasonably selects for the calibration of geostationary orbit satellite-borne synthetic aperture radar phase The site at single ground calibration station, optimization Dan Zhanbu station locations are the calibrations of GEOSAR phases to obtain imaging compensating phase targeted message System first has to one of critical issue solved.About the Optimal Deployment Method at ground calibration station, can be for reference have moonlet Mobile launch distribution of the measurement and control system's stations optimization method, the tracking telemetry and command station layout method of region satellite navigation system and the layout of spaceflight TT＆C system Method etc..
The major defect of the prior art is：Above-mentioned layout method is due to the limitation of specific application, without universality, also not Meet single station arrangement requirement of GEOSAR long synthetic aperture imagings phase calibration.So far, still lack for GEOSAR phases Single station arrangement's method of scaling system.
Invention content
(1) technical problems to be solved
The purpose of the present invention in no mature technology or can propose a kind of same for the earth for reference under conditions of technology The layout method at single ground calibration station of track SAR phases calibration is walked, pointedly solves the calibration of geostationary orbit SAR phases Single station location problem of system, to obtain imaging compensating phase targeted message, provides ground for GEOSAR phase scaling systems and determines Single station arrangement site of labeling station.
(2) technical solution
Technical solution is to provide single station arrangement for GEOSAR phase calibration technologies used by the present invention solves existing issue Scheme, to obtain the accurate echo phase information during image forming job.ECEF coordinate system is used as reference frame, herein The single station arrangement's scheme of GEOSAR phases calibration is formulated under coordinate system.
The present invention provides a kind of layout method at single ground calibration station for the calibration of GEOSAR phases, this method packets It includes：
Choose the cloth station track at single ground calibration station for the calibration of GEOSAR phases；
The rough site at the single ground calibration station of selection；
Optimize the rough site at single ground calibration station.
(3) advantageous effect
Compared with the tracking telemetry and command station layout method of background technology, the present invention obtains single ground for the calibration of GEOSAR phases The scheme for calibrating the placement position at station is to select dedicated phase calibration Dan Zhanbu station tracks, according to Hai Lu, the warp near cloth station track Latitude, the observation elevation angle etc. factors optimizations list station arrangement position acquired have to obtain imaging compensating phase targeted message Beneficial effect includes the following aspects：
1. pointedly solve the location problem at single ground calibration station of geostationary orbit SAR phase scaling systems, The cloth station location at single ground calibration station for the calibration of GEOSAR phases provides reference.
2. only using a ground calibration station, the limited land resources in China have both rationally been utilized, have met GEOSAR spies Determine the phase scaling requirements of observed object, and reduce ground calibration station deployment cost, reduce GEOSAR phase scaling systems Complexity.
Description of the drawings
Fig. 1 is the single ground calibration station arrangement structural representation calibrated for GEOSAR phases according to one embodiment of the invention Figure；
Fig. 2 is the layout method according to the single ground calibration station calibrated for GEOSAR phases of one embodiment of the invention Flow chart；
Fig. 3 is the flow chart according to the optimization method of the ground calibration station site of one embodiment of the invention.
Specific embodiment
Below in conjunction with the specific implementation of the description of the drawings present invention.What the present invention used synthesizes for geostationary orbit Single ground calibration station arrangement structure of aperture radar phase calibration is as shown in Figure 1.
The layout method at single ground calibration station for the calibration of GEOSAR phases of the present embodiment, as shown in Figure 2, tool Body implementation process is as follows：
1. choose the cloth station track at single ground calibration station for the calibration of GEOSAR phases
1. ECEF coordinate system is used as reference frame；
2. in ECEF coordinate system, the substar site of GEOSAR imaging segmental arc middle points is calculated；
3. selection is right by target geodetic coordinates point and geostationary orbit synthetic aperture radar image-forming segmental arc intermediate point institute The big round wires of the earth for the substar answered are cloth station track.
2. choose the rough site at single ground calibration station
1. the rough site at single ground calibration station be located at land on cloth station track or other can cloth station region；
2. rough site is stood in calibration should be as close to the position of observed object.
3. the rough site at the single ground calibration station of optimization
The idiographic flow of the rough site at the single ground calibration station of optimization is as shown in Figure 3.
1. according to geostationary orbit SAR satellites to the visibility principle of earth station, calculate ground calibration station and satellite it Between observation the elevation angle range [Emin-Emax]；
2. calculate the rough site at single ground calibration station and geostationary orbit synthetic aperture radar image-forming segmental arc intermediate point Between the observation elevation angle, if the observation elevation angle be less than minimum angle of elevation Emin, then the increased direction in the elevation angle is observed again along cloth station track The site at ground calibration station is selected, until the observation elevation angle at single ground calibration station is greater than or equal to minimum angle of elevation Emin；It is on the contrary If more than maximum elevation Emax, then the site that the direction that the elevation angle reduces reselects ground calibration station is observed along cloth station track, until The observation elevation angle at single ground calibration station is less than or equal to maximum elevation Emax；So that the observation elevation angle meets Elevation Measure the requirement of range.
3. judging whether the rough site at single ground calibration station meets longitude and latitude condition, the longitude and latitude condition refers to described The site at single ground calibration station is in SOUTHERN CHINA, and longitude makes close to the substar longitude of GEOSAR satellites if being unsatisfactory for The site at single ground calibration station is adjusted as far as possible to SOUTHERN CHINA, and longitude is close to the substar longitude of GEOSAR satellites.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail 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 the guarantor of the present invention Within the scope of shield.

Claims (4)

1. the layout method at a kind of single ground calibration station for the calibration of GEOSAR phases, which is characterized in that this method includes：
Choose the cloth station track at single ground calibration station for the calibration of GEOSAR phases；
The rough site at the single ground calibration station of selection；
Optimize the rough site at single ground calibration station；
Wherein, the rough site at the optimization single ground calibration station includes：
According to geostationary orbit SAR satellites to the visibility principle of earth station, the sight between ground calibration station and satellite is calculated Survey elevation coverage [Emin-Emax]；If the rough site at the list ground calibration station and geostationary orbit synthetic aperture radar The observation elevation angle being imaged between segmental arc intermediate point is less than minimum angle of elevation Emin, then the increased direction weight in the elevation angle is observed along cloth station track The rough site at the new single ground calibration station of selection, until the observation elevation angle at single ground calibration station is faced upward more than or equal to the minimum Angle Emin, otherwise if more than maximum elevation Emax, then the direction that the elevation angle reduces is observed along cloth station track and reselects ground calibration station Rough site, until the observation elevation angle at single ground calibration station is less than or equal to the maximum elevation Emax；
If the longitude and latitude of the rough site at the list ground calibration station is unsatisfactory for condition, i.e., the site at described single ground calibration station In SOUTHERN CHINA, and longitude then adjusts the site at single ground calibration station, makes close to the substar longitude of GEOSAR satellites The site at single ground calibration station is obtained in SOUTHERN CHINA, and longitude is close to the substar longitude of GEOSAR satellites.
2. according to the method described in claim 1, it is characterized in that, described choose is determined for single ground of GEOSAR phases calibration The step of cloth station track of labeling station, further comprises；
ECEF coordinate system is used as reference frame；
In ECEF coordinate system, the substar position of GEOSAR imaging segmental arc middle points is calculated；
Star of the selection corresponding to by target geodetic coordinates point and geostationary orbit synthetic aperture radar image-forming segmental arc intermediate point The big round wires of the earth of lower point are cloth station track.
3. the according to the method described in claim 1, it is characterized in that, item that the rough site at the list ground calibration station is met Part is：
The rough site at the list ground calibration station be located on cloth station track can cloth station region, and the position of close observed object It puts.
4. according to the method described in claim 3, it is characterized in that, the rough site at the list ground calibration station is located at cloth station track On land area.
CN201510988916.7A 2015-12-24 2015-12-24 For the layout method at single ground calibration station of GEOSAR phases calibration Active CN105527622B (en)

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CN107064935B (en) * 2017-06-13 2019-12-03 中国科学院电子学研究所 A kind of Spaceborne SAR System and its construction method
CN112946590B (en) * 2021-02-02 2023-01-13 中国科学院空天信息创新研究院 Efficient site selection method and device for multi-satellite shared Synthetic Aperture Radar (SAR) comprehensive calibration field

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US4758838A (en) * 1984-09-07 1988-07-19 Hitachi, Ltd. Method of reconstructing images from synthetic aperture radar's data
US5495248A (en) * 1992-11-25 1996-02-27 Sachio Uehara, Director General, Technical Research And Development Institute, Japan Defence Agency Stabilizing method of synthetic aperture radar and position determining method thereof
CN101692128A (en) * 2009-09-23 2010-04-07 北京航空航天大学 Synthetic aperture imaging method based on geostationary and geosynchronous orbit satellites
EP1674884B1 (en) * 2004-12-21 2010-08-11 EADS Deutschland GmbH Method of signal processing in an airborne radar with synthetic aperture and device therefor

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US4758838A (en) * 1984-09-07 1988-07-19 Hitachi, Ltd. Method of reconstructing images from synthetic aperture radar's data
US5495248A (en) * 1992-11-25 1996-02-27 Sachio Uehara, Director General, Technical Research And Development Institute, Japan Defence Agency Stabilizing method of synthetic aperture radar and position determining method thereof
EP1674884B1 (en) * 2004-12-21 2010-08-11 EADS Deutschland GmbH Method of signal processing in an airborne radar with synthetic aperture and device therefor
CN101692128A (en) * 2009-09-23 2010-04-07 北京航空航天大学 Synthetic aperture imaging method based on geostationary and geosynchronous orbit satellites

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