CN112327262B - Distributed InSAR satellite SAR beam pointing consistency on-orbit calibration method and system - Google Patents
Distributed InSAR satellite SAR beam pointing consistency on-orbit calibration method and system Download PDFInfo
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Abstract
The invention provides an on-orbit calibration method and system for beam pointing consistency of a distributed InSAR satellite SAR. The invention is suitable for calibrating and maintaining the beam pointing consistency of the distributed InSAR satellite SAR under a two-star (one-shot two-shot) system or a multi-star (one-shot multiple-shot) system, the testing methods, the steps and the basic principle of the two systems are the same, and the description only takes the two-star (one-shot two-shot) system as an example. The implementation of the method can be divided into two parts of coarse adjustment and fine control. The method can be used for designing a distributed InSAR double-star SAR system, and can solve the problems that the beam pointing directions of the distributed InSAR satellite in orbit running double-star SAR are inconsistent, the temperature environments of the double-star SAR are inconsistent due to inconsistent transmitting and receiving states of the double-star SAR in the imaging process, the beam pointing directions of the double-star SAR are deviated, the receiving energy of an auxiliary satellite is reduced, the coherence of the double-star is poor, the surveying and mapping precision is influenced and the like.
Description
Technical Field
The invention relates to the technical field of aerospace systems, in particular to an in-orbit calibration method and system for beam pointing consistency of a distributed InSAR satellite SAR.
Background
Interferometric synthetic aperture radar (InSAR) is an important remote sensing means for obtaining a high-precision ground elevation model (DEM). The method comprises the steps of observing the same area at different visual angles by utilizing two SAR antennas distributed along a vertical course, carrying out interference processing on two acquired complex SAR images, solving the slope distance difference between the phase center of a main radar antenna and a secondary radar antenna and a target, and further obtaining a DEM (digital elevation model) of an observation area. The distributed satellite InSAR system installs two SAR on two flying satellites in formation and simultaneously observes the earth, can overcome the problems of time decoherence and low baseline precision and the like of repeated navigation of the InSAR, and can obtain high-precision DSM.
In order to realize high-precision interference measurement, higher requirements are put forward on the directional consistency of SAR wave beams of two satellites flying in formation. If the pointing consistency of the double-star SAR wave beams is insufficient, the problems that the overlapping band of the double-star SAR echo frequency spectrum becomes small, the coherence is reduced, the auxiliary satellite receiving energy is insufficient and the like are caused, the ground processing effect is influenced, and the results that interference processing cannot be carried out in partial areas and the like are caused.
With the rapid development of the satellite-borne InSAR technology, the application requirements of InSAR mapping products are increasingly raised, the requirements on high-precision products are also increasingly strong, and the on-orbit calibration and maintaining method of SAR beam pointing consistency needs to be intensively researched.
Patent document CN106054185 discloses "a method for calculating an airborne dual-antenna InSAR baseline based on distributed POS", mainly solving the problem that the method for calculating an airborne dual-antenna InSAR baseline is significantly different in application direction, application range and technical approach, and is significantly different from the technical problem solved by the present patent.
Based on the analysis of the influence of the space synchronization of the InSAR of the satellite formation on the system performance, wuhan university Schedule (information science edition), 200710. The main differences are: the patent mainly solves the problem of an on-orbit calibration and maintenance method for beam pointing consistency of a distributed InSAR satellite SAR, and the paper mainly demonstrates the requirement of InSAR elevation measurement on space synchronization under a formation condition and analyzes the influence of the space synchronization on the elevation measurement precision and resolution of an InSAR system, and the application direction, the application range and the technical approach have obvious differences.
An interference SAR satellite formation beam synchronization method, chinese space science and technology, 201005. The main differences are: the patent mainly solves the problem of on-orbit calibration and maintenance of SAR beam pointing consistency of a distributed InSAR satellite, mainly provides an engineering implementation way for completing beam synchronization through satellite formation attitude guidance, solves the problem of how to realize beam synchronization, does not relate to the on-orbit calibration and maintenance of SAR beam pointing consistency, and has obvious differences in application direction and technical ways.
A practical space synchronization method of a satellite-machine bistatic SAR, 200806, electronic and information science and newspaper. The main differences are: the patent mainly solves the problem of on-orbit calibration and maintenance method for beam pointing consistency of a distributed InSAR satellite SAR, and the paper mainly provides a space synchronization realization way for beam pointing of a satellite and an airplane receiving and transmitting platform, and the application direction, the application range and the technical way are obviously different.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a distributed InSAR satellite SAR beam pointing consistency on-orbit calibration method and a distributed InSAR satellite SAR beam pointing consistency on-orbit calibration system.
According to one aspect of the invention, an in-orbit calibration method for beam pointing consistency of a distributed InSAR satellite SAR is provided, which comprises the following steps:
step 1, the double stars respectively image a flat imaging area in a self-transmitting and self-receiving mode;
step 2, respectively calculating the azimuth direction and the range direction beam pointing direction of the double-star SAR at high, medium and low view angles;
step 3, calculating a direction and distance direction pointing consistency deviation curve of the double-star SAR wave beam;
and 4, calibrating the two-star pointing consistency by adjusting the single/two-star postures.
Preferably, said steps 1 to 4 are performed every 1 to 2 years on an orbiting satellite.
Preferably, during each imaging, the double-star carries out fine adjustment compensation on the posture according to the on-orbit real-time working temperature, and the pointing consistency of the double-star in single imaging is ensured.
Preferably, in the step 3, the calculating of the deviation curve of the beam azimuth pointing consistency of the two-star SAR includes calculating a self-receiving mode, the two stars respectively acquire imaging area data by using the same view angle, and two satellites flying in formation are respectively a satellite a and a satellite B, wherein the yaw angle of the satellite a is psi A With a roll angle of
Angle of pitch theta A Angle of oblique flight of satellite is alpha A SAR azimuth beam pointing to AB A (ii) a Yaw angle of B star psi B At a roll angle of
Pitch angle θ B Angle of oblique flight of satellite is alpha B SAR azimuth beam pointing to AB B (ii) a The directional beam pointing consistency of the double-star SAR is delta AB
AB A ＝θ A cosα A -ψ A sinα A
AB B ＝θ B cosα B -ψ B sinα B
ΔAB＝AB A -AB B
Respectively using high viewing angle (sigma) far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta AB) of the double-star SAR azimuth far1 、ΔAB far2 、ΔAB mid1 、ΔAB mid2 、ΔAB near1 、ΔAB near2 ) Establishing a function
ΔAB＝f 1 (σ)
f 1 And calculating a double-star SAR beam azimuth direction consistency deviation curve for the first-time fitting straight line.
Preferably, in the step 3, the calculating two stars is carried outThe deviation curve of the SAR beam pointing consistency comprises that under a self-sending and self-receiving mode, the imaging area data are respectively obtained by double satellites through the same visual angle, and the yaw angle of the A satellite is psi A With a roll angle of
Angle of pitch theta A Angle of inclination of satellite is alpha A SAR range beam pointing to RB A (ii) a Yaw angle of B star is psi B With a roll angle of
Angle of pitch theta B Angle of oblique flight of satellite is alpha B SAR range beam pointing to RB B (ii) a The distance directional beam pointing consistency of the double-star SAR is delta RB
ΔRB＝RB A -RB B
Using high viewing angles (sigma) respectively far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional consistency (delta RB) of the double-star SAR azimuth beam far1 、ΔRB far2 、ΔRB mid1 、ΔRB mid2 、ΔRB near1 、ΔRB near2 ) Establishing a function
ΔRB＝f 2 (σ)
Wherein f is 2 And calculating a distance direction pointing consistency deviation curve of the double-star SAR wave beams for fitting straight lines once, wherein the fitting method is the same as the direction and is not repeated.
Preferably, when the test sample is obtained, regions of the distributed InSAR satellite passing through the imaging region need to be consistent as much as possible during testing, the difference of the regions of the distributed InSAR satellite passing through the imaging region is required to be not more than 10%, and otherwise, the testing precision is seriously reduced.
Preferably, in the step 4, the yaw angle ψ of the single/double star attitude is adjusted according to the double-star SAR beam azimuth direction consistency deviation curve A Or psi B And a pitch angle theta A Or theta B And calibrating the direction of the double-star azimuth beam to ensure that the double-star azimuth consistency deviation curve is superposed with the 0 line of the vertical axis.
Preferably, the rolling angle of the single/double star attitude of the satellite is adjusted according to the distance direction pointing consistency deviation curve of the double-star SAR wave beam
Or
And (3) calibrating the beam directions of the double-star azimuth direction to ensure that the consistency deviation curve of the double-star distance direction is superposed with the 0 line of the vertical axis, wherein the processing method is the same as the azimuth direction.
Preferably, the satellite attitude is calibrated in real time, during each imaging, an SAR antenna thermal deformation curve is obtained according to the temperature gradient in the satellite ground test stage, during in-orbit work, the attitude is finely adjusted according to the real-time working temperature to compensate the SAR antenna thermal deformation, and the consistency of double-satellite pointing in single imaging is ensured.
According to another aspect of the invention, a distributed InSAR satellite SAR beam pointing consistency in-orbit calibration system is provided, comprising:
the module M1, the double stars respectively image the flat imaging area in a self-sending and self-receiving mode;
a module M2, which is used for respectively calculating the azimuth direction and the range direction beam pointing direction of the double-star SAR at high, medium and low visual angles;
a module M3 for calculating a beam azimuth direction and distance direction pointing consistency deviation curve of the double-star SAR;
and the module M4 is used for calibrating the two-star pointing consistency by adjusting the single/two-star posture.
Compared with the prior art, the invention has the following beneficial effects:
1. the method solves the problem of influence of the pointing consistency of the two-star SAR beam on the processing performance, deeply excavates the potential of a satellite system, and can effectively calibrate and keep the higher pointing consistency of the two-star SAR beam;
2. the invention improves the coherence of echo data and the reception-to-noise ratio of auxiliary satellites, thereby improving the mapping precision of the InSAR system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a 'rough tuning' processing step of an on-orbit calibration method for SAR beam pointing consistency of a distributed InSAR satellite;
FIG. 2 is a processing step of "fine control" of the distributed InSAR satellite SAR beam pointing consistency on-orbit calibration method;
FIG. 3 is a SAR beam azimuth pointing consistency deviation curve;
fig. 4 shows the result of the adjustment of the azimuth uniformity of the SAR beam.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In this embodiment, the method provided by the present invention is implemented by the following steps:
(1) An in-orbit calibration method for SAR beam pointing consistency of a distributed InSAR satellite comprises the steps of rough adjustment processing, as shown in figure 1, firstly, acquiring rainforest data, and imaging a flat tropical rainforest area by a double-star in a self-sending and self-receiving mode respectively; then, the distributed InSAR satellite SAR beam pointing consistency in-orbit calibration method "fine control" processing steps are further processed as shown in fig. 2.
(2) Calculating a two-star SAR beam pointing azimuth direction consistency deviation curve
Under the self-sending and self-receiving mode, the double stars respectively acquire tropical rainforest data of the similar regions by using the same visual angle. Two satellites respectively named as A star and B star for formation flight, wherein the yaw angle of A star is psi A At a roll angle of
Pitch angle θ A Angle of oblique flight of satellite is alpha A SAR azimuth beam pointing to AB A (ii) a Yaw angle of B star is psi B With a roll angle of
Pitch angle θ B Angle of oblique flight of satellite is alpha B SAR azimuth beam pointing to AB B (ii) a The directional beam pointing consistency of the double-star SAR is delta AB
AB A ＝θ A cosα A -ψ A sinα A
AB B ＝θ B cosα B -ψ B sinα B
ΔAB＝AB A -AB B
Using high viewing angles (sigma) respectively far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional consistency (delta AB) of the double-star SAR azimuth beam far1 、ΔAB far2 、ΔAB mid1 、ΔAB mid2 、ΔAB near1 、ΔAB near2 ) Establishing a function
ΔAB＝f 1 (σ)
f1 is a first-fit straight line, and as shown in fig. 3, a direction-pointing consistency deviation curve of the double-star SAR beam is calculated. In fig. 3, the horizontal axis represents an SAR view angle, and the vertical axis represents an SAR azimuth direction beam pointing consistency deviation point.
(3) Calculating a deviation curve of the pointing distance direction consistency of the double-star SAR wave beams
Under the self-sending and self-receiving mode, the double stars respectively acquire tropical rainforest data of the similar regions by using the same visual angle. Yaw angle of A starIs phi A With a roll angle of
Angle of pitch theta A Angle of inclination of satellite is alpha A SAR range beam pointing to RB A (ii) a Yaw angle of B star psi B With a roll angle of
Angle of pitch theta B Angle of inclination of satellite is alpha B SAR range beam pointing to RB B (ii) a The distance directional beam pointing consistency of the two-star SAR is delta RB
ΔRB＝RB A -RB B
Respectively using high viewing angle (sigma) far1 、σ far2 ) Middle viewing angle (σ) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta RB) of the double-star SAR azimuth far1 、ΔRB far2 、ΔRB mid1 、ΔRB mid2 、ΔRB near1 、ΔRB near2 ) Establishing a function
ΔRB＝f 2 (σ)
Wherein f is 2 And (5) calculating a distance direction pointing consistency deviation curve of the double-star SAR beam for straight line fitting.
(4) Pointing consistency calibration
And adjusting the yaw angle A or B and the pitch angle A or B of the single/double star posture according to the double-star SAR beam azimuth direction consistency deviation curve, calibrating the double-star azimuth beam direction, and enabling the double-star azimuth direction consistency deviation curve to be overlapped with the vertical axis 0 line, as shown in figure 4.
The specific scheme of fine control is as follows:
and in the satellite ground test stage, a thermal deformation curve of the SAR antenna is obtained according to the temperature gradient, and when the SAR antenna works in an orbit, the attitude is finely adjusted and compensated according to the real-time working temperature, so that the consistency of double-star pointing in single imaging is ensured, and the fine control work needs to be carried out every imaging.
The in-orbit implementation process of the distributed InSAR satellite is as follows: firstly, an application system determines a test task and sends the test task to an operation control system, and the operation control system makes a task plan, compiles a load instruction packet and injects the satellite. The satellite SAR subsystem and the data transmission subsystem are started to operate according to the parameters of the instruction packet, and echo data of the tropical rainforest are recorded and recorded; the attitude control subsystem corrects the star sensitive pointing in real time along with the temperature rise of the SAR antenna array surface until the SAR subsystem and the data transmission subsystem are shut down; the SAR array surface is cooled, and the temperature balance can be ensured; the data transmission subsystem transmits data to the ground receiving station in the available arc section. And the ground receiving station forwards the received satellite data to an application system. The ground application system calculates SAR beam pointing deviation by processing satellite data; meanwhile, the system error of the beam pointing consistency of the double-star SAR and the error of the attitude compensation algorithm can be obtained, the satellite attitude adjustment quantity is determined, and the satellite attitude adjustment quantity is sent to the operation control system. And the operation control system compiles and annotates a satellite attitude adjustment instruction packet, and the satellite completes the final attitude adjustment.
It is well within the knowledge of a person skilled in the art to implement the system and its various devices, modules, units provided by the present invention in a purely computer readable program code means that the same functionality can be implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. An in-orbit calibration method for SAR beam pointing consistency of a distributed InSAR satellite is characterized by comprising the following steps:
step 1, the double stars respectively image a flat imaging area in a self-transmitting and self-receiving mode;
step 2, respectively calculating the azimuth direction and the range direction beam pointing direction of the double-star SAR at high, medium and low view angles;
step 3, calculating a direction and distance direction pointing consistency deviation curve of the double-star SAR wave beam;
step 4, calibrating the double-star pointing consistency by adjusting the single/double-star postures;
performing the steps 1 to 4 every 1 to 2 years on an orbiting satellite;
during each imaging, the double stars perform fine adjustment compensation on the postures according to the on-orbit real-time working temperature, and the pointing consistency of the double stars in single imaging is ensured;
in the step 3, the calculating of the bistatellite SAR beam azimuth direction consistency deviation curve includes that in a self-sending and self-receiving mode, the bistatellite respectively acquires area data of an imaging area by using the same visual angle, two satellites flying in formation are respectively an A satellite and a B satellite, wherein the yaw angle of the A satellite is psi A With a roll angle of
Angle of pitch theta A Angle of oblique flight of satellite is alpha A SAR azimuth beam pointing to AB A (ii) a Yaw angle of B star psi B With a roll angle of
Angle of pitch theta B Angle of inclination of satellite is alpha B SAR azimuth beam pointing to AB B (ii) a The directional beam pointing consistency of the double-star SAR is delta AB
AB A ＝θ A cosα A -ψ A sinα A
AB B ＝θ B cosα B -ψ B sinα B
ΔAB＝AB A -AB B
Using high viewing angles (sigma) respectively far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta AB) of the double-star SAR azimuth far1 、ΔAB far2 、ΔAB mid1 、ΔAB mid2 、ΔAB near1 、ΔAB near2 ) Establishing a function
ΔAB＝f 1 (σ)
f 1 Calculating a double-star SAR wave beam azimuth direction consistency deviation curve for the primary fitting straight line;
in the step 3, the calculating of the deviation curve of the beam pointing consistency of the two-satellite SAR comprises that the two satellites respectively acquire the area data of the imaging area by using the same visual angle in the self-sending and self-receiving modes, and the yaw angle of the A satellite is psi A With a roll angle of
Pitch angle θ A Angle of oblique flight of satellite is alpha A SAR range beam pointing to RB A (ii) a Yaw angle of B star psi B At a roll angle of
Angle of pitch theta B Angle of inclination of satellite is alpha B SAR range beam pointing to RB B (ii) a The distance directional beam pointing consistency of the two-star SAR is delta RB
ΔRB＝RB A -RB B
Using high viewing angles (sigma) respectively far1 、σ far2 ) Middle viewing angle (σ) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta RB) of the double-star SAR azimuth far1 、ΔRB far2 、ΔRB mid1 、ΔRB mid2 、ΔRB near1 、ΔRB near2 ) Establishing a function
ΔRB＝f 2 (σ)
Wherein f is 2 And calculating a distance direction pointing consistency deviation curve of the double-star SAR wave beams for the linear fitting at one time.
2. The in-orbit calibration method for the SAR beam pointing consistency of the distributed InSAR satellite according to claim 1, characterized in that when a test sample is obtained, regions of the distributed InSAR satellite passing through an imaging region need to be consistent as much as possible during testing, the difference of two-star testing regions is required to be not more than 10%, otherwise, the testing precision is seriously reduced.
3. The distributed InSAR satellite SAR beam pointing consistency in-orbit calibration method according to claim 2, wherein in the step 4, the yaw angle ψ of the single/double star attitude is adjusted according to the double star SAR beam azimuth pointing consistency deviation curve A Or psi B And a pitch angle theta A Or theta B And calibrating the direction of the double-star azimuth beam, so that the consistency deviation curve of the double-star azimuth coincides with the longitudinal axis 0.
4. The distributed of claim 3The method for calibrating the beam pointing consistency of the InSAR satellite SAR is characterized in that the rolling angle of the single/double star attitude of the satellite is adjusted according to the distance direction pointing consistency deviation curve of the double-star SAR beam
Or
And (3) calibrating the direction of the double-star azimuth beam, so that the distance direction consistency deviation curve of the double-star coincides with the longitudinal axis 0.
5. The on-orbit calibration method for the beam pointing consistency of the distributed InSAR satellite SAR beam according to claim 4, characterized in that the satellite attitude is calibrated in real time, during each imaging, a thermal deformation curve of the SAR antenna is obtained according to a temperature gradient in a satellite ground test stage, and during in-orbit work, the attitude is finely adjusted according to a real-time working temperature to compensate the thermal deformation of the SAR antenna, so that the consistency of the two-star pointing in a single imaging is ensured.
6. A distributed InSAR satellite SAR beam pointing consistency in-orbit calibration system, comprising:
the module M1, the double stars respectively image the flat imaging area in a self-transmitting and self-receiving mode;
a module M2, which is used for respectively calculating the azimuth direction and the range direction beam pointing direction of the double-star SAR at high, medium and low visual angles;
the module M3 is used for calculating a direction and distance direction pointing consistency deviation curve of the double-star SAR wave beam;
the module M4 is used for calibrating the two-star pointing consistency by adjusting the single/two-star postures;
in the module M3, the calculating of the bisexual SAR beam azimuth direction consistency deviation curve includes calculating a self-sending and self-receiving mode, the bisexual satellites respectively acquire imaging region area data by using the same view angle, and two satellites flying in formation are respectively an a satellite and a B satellite, wherein the yaw angle of the a satellite is psi A With a roll angle of
Pitch angle θ A Angle of oblique flight of satellite is alpha A SAR azimuth beam pointing to AB A (ii) a Yaw angle of B star psi B At a roll angle of
Angle of pitch theta B Angle of inclination of satellite is alpha B SAR azimuth beam pointing to AB B (ii) a The directional beam pointing consistency of the double-star SAR is delta AB
AB A ＝θ A cosα A -ψ A sinα A
AB B ＝θ B cosα B -ψ B sinα B
ΔAB＝AB A -AB B
Respectively using high viewing angle (sigma) far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta AB) of the double-star SAR azimuth far1 、ΔAB far2 、ΔAB mid1 、ΔAB mid2 、ΔAB near1 、ΔAB near2 ) Establishing a function
ΔAB＝f 1 (σ)
f 1 Calculating a double-star SAR beam azimuth direction consistency deviation curve for the first-time fitting straight line;
in the module M3, the calculating of the deviation curve of the beam pointing consistency of the two-satellite SAR includes that in a self-sending and self-receiving mode, the two satellites respectively acquire the area data of the imaging area by using the same view angle, and the yaw angle of the satellite a is psi A With a roll angle of
Angle of pitch theta A Angle of oblique flight of satellite is alpha A SAR range beam pointing to RB A (ii) a Yaw angle of B star psi B With a roll angle of
Angle of pitch theta B Angle of oblique flight of satellite is alpha B SAR range beam pointing to RB B (ii) a The distance directional beam pointing consistency of the double-star SAR is delta RB
ΔRB＝RB A -RB B
Using high viewing angles (sigma) respectively far1 、σ far2 ) Middle viewing angle (sigma) mid1 、σ mid2 ) Low viewing angle (σ) near1 、σ near2 ) Respectively acquiring echo data twice, and calculating the directional beam pointing consistency (delta RB) of the double-star SAR azimuth far1 、ΔRB far2 、ΔRB mid1 、ΔRB mid2 、ΔRB near1 、ΔRB near2 ) Establishing a function
ΔRB＝f 2 (σ)
Wherein f is 2 And calculating a distance direction pointing consistency deviation curve of the double-star SAR wave beams for the linear fitting at one time.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6184825B1 (en) * | 1999-06-29 | 2001-02-06 | Trw Inc. | Method and apparatus for radio frequency beam pointing |
| CN103033812A (en) * | 2012-12-18 | 2013-04-10 | 电子科技大学 | space pursing synchronization method of airborne bistatic synthetic aperture radar (SAR) beam |
| CN109507667A (en) * | 2018-12-21 | 2019-03-22 | 曲卫 | Dual station SAR receiver kinematic error compensation method based on navigation satellite signal |
| CN110501734A (en) * | 2019-08-14 | 2019-11-26 | 上海卫星工程研究所 | Double Satellite SAR satellite combined test system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004104630A1 (en) * | 2003-05-21 | 2004-12-02 | Eads Astrium Limited | Improvements relating to an imaging apparatus and method |
-
2020
- 2020-10-30 CN CN202011197194.0A patent/CN112327262B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6184825B1 (en) * | 1999-06-29 | 2001-02-06 | Trw Inc. | Method and apparatus for radio frequency beam pointing |
| CN103033812A (en) * | 2012-12-18 | 2013-04-10 | 电子科技大学 | space pursing synchronization method of airborne bistatic synthetic aperture radar (SAR) beam |
| CN109507667A (en) * | 2018-12-21 | 2019-03-22 | 曲卫 | Dual station SAR receiver kinematic error compensation method based on navigation satellite signal |
| CN110501734A (en) * | 2019-08-14 | 2019-11-26 | 上海卫星工程研究所 | Double Satellite SAR satellite combined test system and method |
Non-Patent Citations (3)
| Title |
|---|
| 主星带伴随分布式小卫星雷达系统的波束同步分析;刘建平等;《国防科技大学学报》;20060425(第02期);全文 * |
| 分布式星载SAR波束同步误差对合成双程天线方向图的影响分析;吴华铠等;《科学技术与工程》;20110708(第19期);全文 * |
| 非合作式星载双站雷达波束同步设计;黄海风等;《宇航学报》;20050930(第05期);全文 * |
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