CN106646473A - Geosynchronous orbit SAR satellite burst imaging work method - Google Patents
Geosynchronous orbit SAR satellite burst imaging work method Download PDFInfo
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- CN106646473A CN106646473A CN201710056721.8A CN201710056721A CN106646473A CN 106646473 A CN106646473 A CN 106646473A CN 201710056721 A CN201710056721 A CN 201710056721A CN 106646473 A CN106646473 A CN 106646473A
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- Prior art keywords
- geostationary orbit
- orbit sar
- image forming
- satellite
- sar satellite
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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
- G01S13/904—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
- G01S13/904—SAR modes
Abstract
The invention provides a geosynchronous orbit SAR satellite burst imaging work method which comprises the following steps: in a first step, an orbit of a geosynchronous orbit SAR satellite is designed according to system task requirements; in a second step, based on orbit parameters, a geosynchronous orbit SAR satellite wave beam ground speed change law and an SAR satellite Doppler bandwidth change law are obtained via simulation analysis, and a geosynchronous orbit SAR satellite orientation resolution change law can also be obtained; in a third step, based on the geosynchronous orbit SAR satellite wave beam ground speed change law and a geosynchronous orbit SAR satellite burst imaging work mode, a work subaperture timing sequence is designed, a geosynchronous orbit SAR satellite full orbit work timing sequence can be obtained, and continuous observation of a full plotting band can be fulfilled. Application of the method disclosed in the invention can help improve application effectiveness of a geosynchronous orbit SAR satellite, and application prospects of the geosynchronous orbit SAR satellite can be widened.
Description
Technical field
The present invention relates to a kind of method of image forming job of bursting, in particular it relates to a kind of geostationary orbit SAR satellites are sudden
The method for sending out image forming job.
Background technology
The maximum feature of geostationary orbit SAR (Synthetic Aperture Radar, synthetic aperture radar) satellite
It is that it possesses higher temporal resolution, with the quasi real time observing capacity to key area, this requires that SAR system possesses
The ability of continuous work.However, by spaceborne power technology and energy power restriction, if according to traditional satellite-borne SAR working system, nothing
Method meets the energy demand that SAR system is high-power, work long hours.Accordingly, it would be desirable to appointing according to geostationary orbit SAR satellites
Business demand and technical characterstic, carry out New System, new industrial research, break through traditional working system, are ensureing energy requirement balance
On the premise of technical requirement, and full mapping band Continuous Observation can be realized.
The orbit altitude of the approximate six times of earth radius of geostationary orbit SAR satellites result in that earth rotation becomes can not
The factor ignored, so as to cause the scrambling of wave beam ground speed and target Doppler course, ultimately results in satellite fortune
Full aperture azimuth resolution is also differed on capable diverse location, should not adopt traditional star ground equivalent model, need to be using accurate
Satellite orbit model and ellipsoid model of globe analysis target Doppler characteristic, carry out full track azimuth resolution analysis.In addition,
Although full aperture observation can reach high-resolution, its data transfer rate is too high, and range migration amount is excessive so that imaging is difficult to reality
It is existing.In order to ensure the uniformity of the resolution ratio observed in band and simplify the difficulty of imaging, it is also desirable to study and design and be new
Working system.
Currently without the explanation or report that find technology similar to the present invention, money similar both at home and abroad is also not yet collected
Material.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of geostationary orbit SAR satellites are burst into
As the method for work, above-mentioned technical problem is solved, and adapt to geostationary orbit continuous monitoring demand, sequential rationally, meets skill
Art index and energy demand.
According to an aspect of the present invention, there is provided a kind of geostationary orbit SAR satellites are burst the method for image forming job, its
It is characterised by, the burst method of image forming job of the geostationary orbit SAR satellites is comprised the following steps：
Step one, according to the track of system task Demand Design geostationary orbit SAR satellites；
Step 2, according to orbit parameter, simulation analysis obtain geostationary orbit SAR satellite beams ground speed variations rule
Rule and SAR Satellite Doppler Method bandwidth Changing Patterns, and obtain geostationary orbit SAR satellite position change resolution rules；
Step 3, according to geostationary orbit SAR satellite beams ground speed variations rules and according to geostationary orbit
SAR satellites are burst image forming job pattern, and design work sub-aperture sequential finally gives geostationary orbit SAR satellite full track works
Make sequential, realize full mapping band Continuous Observation.
Preferably, the geostationary orbit SAR satellites burst image forming job method using bursting image forming job system.
Preferably, the geostationary orbit SAR satellites burst image forming job method adopt sub-aperture working system.
Preferably, the track of the geostationary orbit SAR satellites is wanted according to overlay area, coverage, revisit time
Ask, fixed position main to satellite orbit, orbit inclination angle and orbital eccentricity are designed；Then according to the track of design,
Covering performance is analyzed with reference to load parameter.
Preferably, the step 3 analyzes geostationary orbit SAR system full aperture based on earth model and model trajectory
Change resolution situation；And the two kinds of mode of operations of band imaging and scanning imagery for index request calculate specified resolution bar
Work sub-aperture sequential under part, design meets observation with the consistent geostationary orbit SAR satellite operation systems of intrinsic resolution.
Compared with prior art, the present invention has following beneficial effect：The present invention is solved first due to synthetic aperture
Time length and the difficult problem such as weak relevant, curved in tracks that the imaging that brings faces, so that existing imaging algorithm passes through
Appropriate modification is applicable to the imaging of geostationary orbit SAR, greatly reduces geostationary orbit SAR imagings and opens
The difficulty of research is sent out, the engineer applied process of geostationary orbit SAR is promoted.Secondly present invention reduces geostationary orbit
The synthetic aperture imaging working time of SAR satellites so as to be reduced in the attainable works scope of satellite power supply, so as to solve
The problem of the continuous work of geostationary orbit SAR, realizes the engineering problem for persistently observing key area imaging, improves
The effectiveness of geostationary orbit SAR satellites, extends the application prospect of geostationary orbit SAR satellites.
Description of the drawings
The detailed description by reading non-limiting example made with reference to the following drawings, the further feature of the present invention,
Objects and advantages will become more apparent upon：
Fig. 1 bursts image forming job schematic diagram for geostationary orbit SAR satellites.
Fig. 2 is the schematic diagram of geostationary orbit SAR satellite beams ground speed variations rules.
Fig. 3 is the schematic diagram of SAR Satellite Doppler Method bandwidth Changing Patterns.
Fig. 4 is the schematic diagram of geostationary orbit SAR satellite position change resolution rules.
Fig. 5 is the schematic diagram of geostationary orbit SAR satellite full aperture Time Changes.
Fig. 6 is the schematic diagram of geostationary orbit SAR satellite full aperture Time Changes.
Fig. 7 be sub-aperture pattern adjust the distance migration improvement schematic diagram.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, some deformations and improvement can also be made.These belong to the present invention
Protection domain.
The burst method of image forming job of geostationary orbit SAR satellites of the present invention is comprised the following steps：
Step one, according to the track of system task Demand Design geostationary orbit SAR satellites, track mainly includes track
Fixed position, orbit inclination angle and orbital eccentricity；
The Track desigh of specific geostationary orbit SAR satellites can be wanted according to overlay area, coverage, revisit time
The system requirements such as seek, three key parameters such as fixed position main to satellite orbit, orbit inclination angle and orbital eccentricity are carried out
Design；Then according to the track of design, with reference to load parameter (visual angle, sweep limits) covering performance is analyzed.
Step 2, according to the orbit parameter of the geostationary orbit SAR satellites of above-mentioned design, it is same that simulation analysis obtain the earth
Step track SAR satellite beams ground speed variations rules and SAR Satellite Doppler Method bandwidth Changing Patterns, as shown in Figures 2 and 3,
And geostationary orbit SAR satellite position change resolution rules are obtained, as shown in Figure 4.
By analysis, it is seen that it is different with low orbit SAR satellites, the wave beam ground speed of geostationary orbit SAR satellites with
SAR Satellite Doppler Methods bandwidth changes with the change of track argument (i.e. satellite position), and excursion is than larger, so as to
Geostationary orbit SAR satellite positions resolution ratio is caused to change also with the change of track argument (i.e. satellite position).
Knowable to the Changing Pattern, the azimuth resolution of some orbital positions has reached 1-2 rice scopes, significantly larger than system
The requirement of 10 meters of resolution ratio, therefore, the synthetic aperture time can be reduced in the position, so as to reduce resolution ratio, you can meet full track
The requirement of 10 meters of resolution ratio.
Step 3, according to the change of geostationary orbit SAR satellite beams ground speeds, doppler bandwidth and azimuth resolution
Rule, and image forming job pattern is burst (as shown in figure 1, A representatives " part aperture ", B generations according to geostationary orbit SAR satellites
Table " full aperture ", C represents " invalid image ", and D represents " effective imaging region "), design work sub-aperture sequential is (such as Fig. 6 institutes
Show), geostationary orbit SAR satellite full track work schedules are finally given, by the sequential rule, propose that system power supply design is needed
Ask, so as to realize full mapping band Continuous Observation.
Based on earth model and model trajectory, geostationary orbit SAR system full aperture change resolution situation is analyzed；And
The work sub-aperture under the conditions of two kinds of mode of operations calculating specified resolutions of band imaging and scanning imagery for index request
Sequential, design meets observation with the consistent geostationary orbit SAR satellite operation systems of intrinsic resolution.
Dimensional orientation resolution ratio ρ of SAR satellitesaFor following formula (1)：
Wherein, BaFor doppler bandwidth,For wave beam ground speed.If semi-major axis of orbit is a, satellite velocities areThe earth
Spin velocity isBeam position is with the position of earth's surface intersection pointAnd the intersection point and satellite position vectors angle are θ,
ThenIt is represented by following formula (2)：
For geo-synchronous orbit satellite, satellite motion speed is about 3000m/s, and above formula Section 1 isNo
500m/s can be exceeded, it is suitable with earth rotation linear velocity, it means that system of the earth rotation to geostationary orbit SAR satellites
Performance becomes apparent from the impact of imaging.It is the amount closely related with orbit inclination angle and observation visual angle, is expressed as follows formula
(3)：
Wherein,For latitude argument, i is orbit inclination angle, and ψ is satellite yaw angle, θLFor antenna look angle, ReIt is average for the earth
Radius.
Simulation analysis obtain under different visual angles satellite ground velocity with latitude argument Changing Pattern.Due to geostationary orbit SAR
The Doppler history of satellite is complicated, it is impossible to simply use quadratic polynomial approximate expression, and the method for simulation analysis can be adopted to obtain
Geostationary orbit SAR satellite beams ground speed variations rules and doppler bandwidth Changing Pattern.Synthesized beam ground speed
And doppler bandwidth, geostationary orbit SAR satellite position change resolution rules are obtained according to formula (1).Such as Fig. 5 institutes
Show, due to the aperture time that wave beam ground speed result in slowly geostationary orbit SAR satellites it is very long.Geostationary orbit SAR
Satellite orbital altitude is high, and its ground speed, satellite velocities, velocity equivalent affect big to resolution ratio, doppler bandwidth.According to the earth
The running track feature and working method of geo-stationary orbit SAR satellites, fully analyzes and obtains its ground speed variations rule.Due to
Geostationary orbit SAR satellite grounds running orbit is complicated, and its Doppler history is complicated, it is impossible to simple near with quadratic polynomial
Like expressing, according to the running track feature and working method of geostationary orbit SAR satellites, its Doppler is fully analyzed and obtained
Bandwidth Changing Pattern.Because geostationary orbit SAR satellite grounds running orbit is complicated, its azimuth resolution is in-orbit with satellite
Diverse location change it is obvious, synthesized beam ground speed and doppler bandwidth are obtained the complete of geostationary orbit SAR satellites
The Changing Pattern of track azimuth resolution.
Geostationary orbit SAR satellite positions resolution ratio is can be seen that by analysis above to be continually changing with track operation,
Thus cause azimuth resolution inconsistent in scene, traditional band pattern will no longer be suitable for, need for different resolutions
Rate requires to redesign working system.
Analysis obtains a full aperture time and specified resolution corresponding aperture time.Due to geostationary orbit SAR
The resolution ratio of most of the time is higher when satellite full aperture works, while complicated movement, this all causes imaging difficulty to increase.
Therefore, it is intended that and uses part aperture data imaging, that is, image forming job pattern of bursting, schematic diagram is as shown in Figure 1.Controlling switch machine
Time so that each sub-aperture time meets the requirement of azimuth resolution, and designs sub-aperture work schedule, meet and adjacent see twice
The orientation subband of survey is capable of achieving orientation splicing.
Using image forming job system of bursting, i.e., using sub-aperture rather than full aperture working system, first advantage be
The satellite energy also can meet in the case of need not continuously powering to be surveyed and drawn with continuous imaging observation entirely, is to ensure satellite energy
Balance creates condition.
It is, with reference to driftage control, range migration can be greatly reduced using another advantage of image forming job system of bursting
Amount (as shown in Figure 7), by kilometers up to a hundred only tens meters are decreased to, and reduce system synthesis aperture time, so as to reduce
Imaging difficulty.
Sub-aperture working system design focal point needs the solve problem to be, beam position track " flex point " region, wave beam meeting
Repeated measures the same area, increased sub-aperture work schedule design difficulty.To be directed to " flex point " region observation feature, accurately
Ground analysis target Doppler frequency Changing Pattern, studies orientation subband splicing, finally realizes the working system of full track.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make various modifications or modification, this not shadow
Ring the flesh and blood of the present invention.
Claims (5)
1. a kind of geostationary orbit SAR satellites are burst the method for image forming job, it is characterised in that the geostationary orbit
The burst method of image forming job of SAR satellites is comprised the following steps：
Step one, according to the track of system task Demand Design geostationary orbit SAR satellites；
Step 2, according to orbit parameter, simulation analysis obtain geostationary orbit SAR satellite beams ground speed variations rules and
SAR Satellite Doppler Method bandwidth Changing Patterns, and obtain geostationary orbit SAR satellite position change resolution rules；
Step 3, defends according to geostationary orbit SAR satellite beams ground speed variations rules and according to geostationary orbit SAR
Star is burst image forming job pattern, design work sub-aperture sequential, when finally giving geostationary orbit SAR satellites full track and working
Sequence, realizes full mapping band Continuous Observation.
2. geostationary orbit SAR satellites according to claim 1 are burst the method for image forming job, it is characterised in that institute
State geostationary orbit SAR satellites burst image forming job method using bursting image forming job system.
3. geostationary orbit SAR satellites according to claim 1 are burst the method for image forming job, it is characterised in that institute
State geostationary orbit SAR satellites burst image forming job method adopt sub-aperture working system.
4. geostationary orbit SAR satellites according to claim 1 are burst the method for image forming job, it is characterised in that institute
The track of geostationary orbit SAR satellites is stated according to overlay area, coverage, revisit time requirement, mainly to satellite orbit
Fixed position, orbit inclination angle and orbital eccentricity be designed；Then according to the track of design, cover with reference to load parameter analysis
Lid performance.
5. geostationary orbit SAR satellites according to claim 1 are burst the method for image forming job, it is characterised in that institute
Step 3 is stated based on earth model and model trajectory, geostationary orbit SAR system full aperture change resolution situation is analyzed；And
The work sub-aperture under the conditions of two kinds of mode of operations calculating specified resolutions of band imaging and scanning imagery for index request
Sequential, design meets observation with the consistent geostationary orbit SAR satellite operation systems of intrinsic resolution.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051808A (en) * | 2017-10-25 | 2018-05-18 | 上海卫星工程研究所 | High rail SAR continuously stares working system design method |
| CN109977760A (en) * | 2019-01-30 | 2019-07-05 | 上海卫星工程研究所 | The intelligent spaceborne task management method of object-oriented Synthetic Aperture Radar satellite |
| CN112379377A (en) * | 2020-10-30 | 2021-02-19 | 上海卫星工程研究所 | Distributed InSAR satellite long strip surveying and mapping optimization SAR task planning method and system |
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| CN109977760B (en) * | 2019-01-30 | 2021-03-16 | 上海卫星工程研究所 | Target-oriented intelligent satellite-borne task management method for synthetic aperture radar satellite |
| CN112379377A (en) * | 2020-10-30 | 2021-02-19 | 上海卫星工程研究所 | Distributed InSAR satellite long strip surveying and mapping optimization SAR task planning method and system |
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Application publication date: 20170510 |