CN105044714B - A kind of imaging method based on satellites formation - Google Patents
A kind of imaging method based on satellites formation Download PDFInfo
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- CN105044714B CN105044714B CN201510208120.5A CN201510208120A CN105044714B CN 105044714 B CN105044714 B CN 105044714B CN 201510208120 A CN201510208120 A CN 201510208120A CN 105044714 B CN105044714 B CN 105044714B
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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
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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
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- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention relates to a kind of imaging method based on satellites formation, the satellites formation includes multiple satellites, and these satellites are in same orbital plane, forms linear formation；The imaging method includes：Each satellite in the satellites formation flown around celestial body or equivalent center of attraction does intensive sampling in spatial frequency domain；According to the requirement of imaging, sampled data is chosen from sampled result, generate corresponding image.The present invention solves the required spatial frequency domain intensive sampling requirement of high-performance imaging.
Description
Technical field
The present invention relates to satellite imagery field, more particularly to a kind of imaging method based on satellites formation.
Background technology
The passive radio imaging technique of interference formula is to develop very rapid high-resolution radio imaging method in recent years.Microwave
Interference is also referred to as aperture synthesis, and its basic component units is binary interferometer, for detecting high spatial resolution radiation brightness figure
Picture, image angular resolution by binary interferometer the most Long baselines (length that distance is projected in detection direction between two microwave antennas
Degree) determine.Baseline is the necessary condition that interference formula radio telescope carries out high-resolution imaging.During interference type image-forming,
The relatively low component of frequency in short baseline correspondence image spatial spectrum, namely the more slow information of space fluctuation ratio；Long baselines corresponding diagram
Frequency component higher in the spectrum of image space, namely space fluctuation ratio information faster.Spatial image is Fourier with spatial spectrum
Transformation relation, when the baseline profile of radio telescope is covered than more complete from short baseline to Long baselines, by Fourier's series just
The spatial distribution of cosmic radiation can in high quality be recovered.Therefore, the radio telescope of baseline dense distribution is studied, for obtaining
High-quality cosmic emission information has very important application value.At present, formula radio telescope technology has been interfered
One of focus as domestic and international research.The information that two antennas are received is multiplied and is integrated again using cross-correlator, you can
Obtain a sampled point of visibility function.Visibility function in mathematical definition, be object space distribution function in space frequently
The frequency spectrum in rate domain.Interference formula radio imaging technique is by obtaining spatial frequency spectrum, then to recover target by Fourier transformation
Spatially distributed functions.Therefore, briefly, the passive radio imaging technique of interference formula is the spatial frequency letter by detecting target
Number, obtains the technology of object space distribution.
According to above-mentioned theory basis, the detection performance of the passive radio imaging of interference formula is sampled depending on spatial frequency domain
Performance.Spatial frequency domain sampling follows Nyquist's theorem, namely spatial frequency domain sampling density should be less than being equal to instrument space
The half of resolution ratio, and the covering of spatial frequency should meet complete covering from zero-frequency to highest frequency.Then space area image can
By Fourier transformation Exact Reconstruction.
The passive radio imaging technique research of interference formula starts from 1890, and Michelson has been carried out micro- using separate antenna
Wave interference is tested；Nineteen forty-six, Ryle and Vonberg utilize binary radio interferometer, have carried out sun observation；, Ryle in 1962
It is further proposed that using earth rotation, more baseline coverings are realized, so that the method for improving interference imaging quality；, ground in 1967
Base very long baseline interferometer (VLBI) comes into operation；The U.S. in 1986 has carried out star ground using stationary orbit communications satellite TDRSS
Radio interference experiment；1997, Japan's transmitting HALCA satellites carried out star ground interference experiment on elliptic orbit；2009,
European Space Agency transmits SMOS satellites, and its Main Load is the interference type micro-wave radiometer of Y type array layouts.In recent years, Holland etc.
Country proposes the cubical array distribution scheme based on satellites formation, improves most Long baselines and then improves spatial resolution.
However, the current scheme all Existential Space frequencies for realizing the passive radio imaging of interference formula based on satellites formation both at home and abroad
Domain sampling is excessively sparse, and imaging mainly passes through various estimation algorithms, that is to say, that in spatial frequency domain, sampling can exist a large amount of
Blank, to obtaining the problems such as high-quality picture strip carrys out extreme difficulties, result is not unique.Additionally, satellites formation technology is deposited in itself
In risk of collision, three-dimensional satellite Formation Orbit is more complicated, causes the survey appearance of satellite system, surveys the design implementation such as rail, anticollision
There is high challenge.
The content of the invention
Spatial frequency domain covering it is an object of the invention to overcome existing satellite-borne microwave interference system to exist is excessively dilute
Dredge, different observed direction imaging performances widely different problems, so as to provide a kind of spatial frequency domain intensive sampling that can realize
Imaging method.
To achieve these goals, the invention provides a kind of imaging method based on satellites formation, the satellites formation
Including multiple satellites, these satellites are in same orbital plane, form linear formation；The imaging method includes：
Step 1), each satellite in the satellites formation that is flown around celestial body or equivalent center of attraction do close in spatial frequency domain
Collection sampling；
Step 2), according to the requirement of imaging, from step 1) obtained by sampled result in choose sampled data, generation correspondence
Image.
In above-mentioned technical proposal, the step 1) further include：
Step 101), cross-correlation is done in satellites formation between any pair satellite, form the interference baseline of almost linear distribution；
Each interference baseline under almost linear distribution can do sampling operation in satellites formation in any instant of track plane flying, obtain
To spatial frequency domain visibility function sampled point；The spatial frequency domain visibility function sampled point is also distributed into almost linear；
Step 102), satellites formation along orbital plane flight when, almost linear distribution interference baseline revolved in two-dimensional space
Turn, so that baseline covering is that some concentric circles or helix are distributed by almost linear Distribution evolution, every 1/2 orbital period, complete
Once two dimension dish baseline covering；Each interference baseline does sampling operation in once two dimension dish baseline overwrite procedure, this
Sampling operation is referred to as the two-dimentional visibility function sampling of spatial frequency domain；
Step 103), in the case where celestial mechanics and dynamics of orbits factor drive, orbital plane Temporal Evolution, each orbital plane
Had angle with previous orbital plane shape so that two dimension dish baseline covering is gradually evolved into threedimensional baseline covering；Each interference base
Line does sampling operation in threedimensional baseline overwrite procedure, and this sampling operation is referred to as the three-dimensional visibility function of spatial frequency domain
Sampling；
Step 104), satellites formation in flight course, be that each satellite in formation applies a thrust so that inter-satellite
Form a speed difference, and then cause that the length of the interference baseline formed two-by-two between satellite is gradually changed, thus obtain it is more not
With the baseline of length；
Step 105), in a cycle of satellites formation expansion and contraction do sampling operation, the sampling operation is referred to as
The ciphering two-dimension visibility function sampling of spatial frequency domain；
Step 106), in a cycle that satellites formation orbital precession returns to preliminary orbit plane, continuous repeatedly satellite
The process of formation expansion and contraction, while doing sampling operation, the encryption three-dimensional that the sampling operation is referred to as spatial frequency domain is visible
Degree function sampling.
In above-mentioned technical proposal, step 104) further include：
Step 104-1), be each satellite apply a speed increment so that satellites formation along orbit plane extend, interference
The length of baseline increases；
Step 104-2), after baseline length reaches most Long baselines requirement, speed is reversely applied to each satellite and is increased
Amount so that satellites formation shrinks along orbital plane, interferes the length of baseline to reduce；
Step 104-3), when interfere baseline length reach most short baseline requirement after, re-execute step 104-1) so that
The two-dimensional projection of three-dimensional interference baseline can realize most Long baselines to the complete covering between most short baseline in orbital precession.
In above-mentioned technical proposal, the step 2) further include：
Step 2-1), based on spatial frequency domain visibility function sampled point with interference baseline information carry out inverting, obtain a little
The image of target；
Step 2-2), the two-dimentional visibility function sampled data based on spatial frequency domain with interference baseline information carry out instead
Drill, obtain the two dimensional image of point target and extension target in two dimensional surface；
Step 2-3), the three-dimensional visibility function sampled data based on spatial frequency domain with interference baseline information carry out instead
Drill, obtain the 3-D view of point target and extension target in three dimensions；
Step 2-4), the ciphering two-dimension visibility function sampled data based on spatial frequency domain with interference baseline information carry out
Inverting, obtains the two dimensional image of point target and extension target in two dimensional surface；The picture quality of the two dimensional image is higher than step 2-
2) picture quality of the two dimensional image obtained by；
Step 2-5), encryption based on spatial frequency domain three-dimensional visibility function sampled data carries out with baseline information is interfered
Inverting, obtains the 3-D view of point target and extension target in three dimensions；The picture quality of the 3-D view is higher than step 2-
3) picture quality of the 3-D view obtained by.
In above-mentioned technical proposal, the inverting uses the transform method of spatial domain-spatial frequency domain, including Fourier transformation
Method, clean algorithm, compressed sensing algorithm, neural network algorithm.
The advantage of the invention is that：
1st, present invention baseline realizes spatial frequency domain two dimension sampling along the motion of track, using the precession reality of satellite orbit
Existing spatial frequency domain three-dimensional sample, the spatial frequency domain intensive sampling requirement needed for solving high-performance imaging；
2nd, satellite of the present invention is linearly formed into columns and simplifies formation control difficulty, also effectively reduces satellites formation
Risk of collision；
3rd, every satellite carries a secondary microwave/radio frequency reception antenna, and it is corresponding receive, amplify, sampling, signal are located in advance
Between reason and star/star earth signal transmission unit etc..The relative position measurement of Satellite Formation Flying using radio frequency range finding, radio frequency interference angle measurement and
Optics angle measurement technique, so as to ensure that the accurate measurement of interference baseline, to realize based on the high-performance of satellites formation, low-risk
The passive interference imaging of microwave/radio frequency.
Brief description of the drawings
Fig. 1 is the around-the-moon flight situation schematic diagram of satellites formation；Wherein,
Fig. 1 (a) is that satellites formation is located at moon right side；
Fig. 1 (b) flies over 1/4 track for satellites formation；
Fig. 1 (c) flies over 1/2 track for satellites formation；
Fig. 2 is the linear satellites formation baseline coverage condition schematic diagram for surrounding lunar flight；Wherein,
Fig. 2 (a) is the baseline coverage condition schematic diagram shown in Fig. 1 (a) corresponding to situation；
Fig. 2 (b) is the baseline coverage condition schematic diagram shown in Fig. 1 (b) corresponding to situation；
Fig. 2 (c) is the baseline coverage condition schematic diagram shown in Fig. 1 (c) corresponding to situation；
Fig. 3 is the relation schematic diagram of threedimensional baseline covering and orbital precession；Wherein,
Fig. 3 (a) is that orbital precession covers schematic diagram to threedimensional baseline at 90 degree；
Fig. 3 (b) is that orbital precession covers schematic diagram to baseline during 180 degree；
Fig. 3 (c) is that orbital precession covers schematic diagram to baseline at 270 degree,
Baseline covering schematic diagram when Fig. 3 (d) is 360 degree of complete track precession period；
Fig. 4 is the flow chart of imaging method of the invention.
Specific embodiment
In conjunction with accompanying drawing, the invention will be further described.
Imaging method of the invention can be not only used for microwave imaging, it can also be used to which radio or other frequency ranges are imaged.To this hair
Before bright imaging method elaborates, the satellites formation that the method is based on is been described by first.
Satellites formation includes a female satellite and some subsatellites.The female satellite for carrying subsatellite enters planned orbit
Afterwards, female satellite discharges subsatellite to same direction one by one, and release stepmother's satellite is in same orbital plane with each subsatellite, shape
Linear formation.Every satellite carries a secondary microwave or radio frequency reception antenna, and corresponding receiving unit, amplifying unit, adopts
Signal transmission unit, star earth signal transmission unit between sample unit, Signal Pretreatment unit, star.
An interference baseline is formed between any pair satellite in satellites formation, if satellites formation has N satellite, should
Satellites formation forms N (N-1)/2 independent interference baseline.These interference baselines form almost linear distribution.
Imaging method of the invention is comprised the following steps：
Step 1), flown around celestial body or equivalent center of attraction, each in satellites formation in same orbital plane defend
Star does intensive sampling in spatial frequency domain；
Step 2), according to the requirement of imaging, from step 1) obtained by sampled result in choose sampled data, generation correspondence
Image.
In the step 1) in, do intensive sampling in spatial frequency domain and further include：
Step 101), cross-correlation is done in satellites formation between any pair satellite, form interference baseline, these interference baselines
Into almost linear distribution；Lower each of almost linear distribution interfere baseline can satellites formation track plane flying any instant
Sampling operation is done, spatial frequency domain visibility function sampled point is obtained；The spatial frequency domain visibility function sampled point also into
Almost linear is distributed；
Step 102), satellites formation along orbital plane flight when, almost linear distribution interference baseline revolved in two-dimensional space
Turn, so that baseline covering is that some concentric circles or helix are distributed by almost linear Distribution evolution, every 1/2 orbital period, complete
Once two dimension dish baseline covering；Each interference baseline does sampling operation in once two dimension dish baseline overwrite procedure, this
Sampling operation is referred to as the two-dimentional visibility function sampling of spatial frequency domain；
Step 103), in the case where celestial mechanics and dynamics of orbits factor drive, orbital plane Temporal Evolution, each orbital plane
Had angle with previous orbital plane shape so that two dimension dish baseline covering is gradually evolved into threedimensional baseline covering；Each interference base
Line does sampling operation in threedimensional baseline overwrite procedure, and this sampling operation is referred to as the three-dimensional visibility function of spatial frequency domain
Sampling；
Step 104), satellites formation in flight course, be that each satellite in formation applies a thrust so that inter-satellite
Form a speed difference, and then cause that the length of the interference baseline formed two-by-two between satellite is gradually changed, thus obtain it is more not
With the baseline of length；
Step 105), in a cycle of satellites formation expansion and contraction do sampling operation, the sampling operation is referred to as
The ciphering two-dimension visibility function sampling of spatial frequency domain；
Step 106), in a cycle that satellites formation orbital precession returns to preliminary orbit plane, continuous repeatedly satellite
The process of formation expansion and contraction, while doing sampling operation, the encryption three-dimensional that the sampling operation is referred to as spatial frequency domain is visible
Degree function sampling.
Step 104) can further include：
Step 104-1), be each satellite apply a speed increment so that satellites formation along orbit plane extend, interference
The length of baseline increases；
Step 104-2), after baseline length reaches most Long baselines requirement, speed is reversely applied to each satellite and is increased
Amount so that satellites formation shrinks along orbital plane, interferes the length of baseline to reduce；
Step 104-3), when interfere baseline length reach most short baseline requirement after, re-execute step 104-1) so that
The two-dimensional projection of three-dimensional interference baseline can realize most Long baselines to the complete covering between most short baseline in orbital precession.
The step 2) further include：
Step 2-1), based on spatial frequency domain visibility function sampled point with interference baseline information carry out inverting, obtain a little
The image of target；Wherein, the inverting using spatial domain-spatial frequency domain transform method, such as fourier transform method (FFT),
Clean algorithm (CLEAN), compressed sensing algorithm, neural network algorithm etc.；
Step 2-2), the two-dimentional visibility function sampled data based on spatial frequency domain with interference baseline information carry out instead
Drill, obtain the two dimensional image of point target and extension target in two dimensional surface；Wherein, the inverting uses spatial domain-spatial frequency
The transform method in domain, such as fourier transform method (FFT), clean algorithm (CLEAN), compressed sensing algorithm, neural network algorithm；
Step 2-3), the three-dimensional visibility function sampled data based on spatial frequency domain with interference baseline information carry out instead
Drill, obtain the 3-D view of point target and extension target in three dimensions；Wherein, the inverting uses spatial domain-spatial frequency
The transform method in domain, such as fourier transform method (FFT), clean algorithm (CLEAN), compressed sensing algorithm, neural network algorithm；
Step 2-4), the ciphering two-dimension visibility function sampled data based on spatial frequency domain with interference baseline information carry out
Inverting, obtains the two dimensional image of point target and extension target in two dimensional surface；The picture quality of the two dimensional image is higher than step 2-
2) picture quality of the two dimensional image obtained by；Wherein, the inverting uses the transform method of spatial domain-spatial frequency domain, such as
Fourier transform method (FFT), clean algorithm (CLEAN), compressed sensing algorithm, neural network algorithm etc.；
In this step, it is because when ciphering two-dimension visibility function sampled data is gathered, baseline covering is intensive therefore empty
Between Inversion in frequency domain spatial domain inversion error it is smaller, inversion accuracy is higher, and the secondary lobe of compound direction figure is smaller so that final
Resulting two-dimensional image quality be higher than step 2-2) obtained by two dimensional image picture quality；
Step 2-5), encryption based on spatial frequency domain three-dimensional visibility function sampled data carries out with baseline information is interfered
Inverting, obtains the 3-D view of point target and extension target in three dimensions；The picture quality of the 3-D view is higher than step 2-
3) picture quality of the 3-D view obtained by；Wherein, the inverting uses the transform method of spatial domain-spatial frequency domain, such as
Fourier transform method (FFT), clean algorithm (CLEAN), compressed sensing algorithm, neural network algorithm etc.；
In this step, because three-dimensional encryption sampling causes that the sampling density of its two-dimensional projection is very high, therefore encryption three
Picture quality highest obtained by dimension visibility function sampled data inverting.
In one embodiment, satellites formation includes a female satellite and some subsatellites；Ripple is installed on each satellite
Length, in the ultralow frequency radiation meter of 0.1MHz-30MHz, also carries a secondary microwave in 10 meters to 3000 meters, working frequency range on satellite
Or radio frequency reception antenna, and corresponding signal biography between receiving unit, amplifying unit, sampling unit, Signal Pretreatment unit, star
Defeated unit, star earth signal transmission unit.
Female satellite carries subsatellite in transmitter section and Orbit Transformation section, into after target track, subsatellite is discharged one by one
To same orbital plane；
After subsatellite launches to form linear formation, using wireless distance finding, wireless angle measurement, optics angle measurement, laser ranging angle measurement
Etc. technological means, the accurate measurement of three dimensions baseline is realized；
Technology is captured/tames using clock, the clock synchronization of all satellites in realizing forming into columns；
The payload of each subsatellite is distributed under synchronised clock driving, synchronous reception gathers echo signal；
The signal of each subsatellite collection is sent to main satellite and is focused on by inter-satellite link.Or each height
The signal of satellite collection is sent to other subsatellites by inter-satellite link, carries out distributed treatment；
The signal of subsatellite collection, real-time or time delay is transmitted to female satellite or other subsatellites；
Female satellite reception carries out in-orbit relevant treatment to after the signal of all subsatellites, and result is passed through into star ground chain
Ground receiving equipment is transmitted under road；
All subsatellite signals of female satellite reception can also be without treatment, directly by initial data by under satellite-ground link
It is transmitted to ground receiving equipment；
The threedimensional baseline information of in-orbit real-time measurement under satellite-ground link by being transmitted to ground receiving equipment；
After central station receives payload data, with reference to base line measurement information, realize to celestial body into
Picture.
In the present embodiment, satellites formation flies around moon circular orbit, 300 kilometers of orbit altitude, and the orbital period 2.3 is small
When.Fig. 1 illustrates the around-the-moon flight situation of satellites formation, and point A therein represents the current location of satellites formation, and lines B is represented
The flight path of satellites formation.Fig. 2 illustrates the linear satellites formation baseline coverage condition schematic diagram around lunar flight.
In Fig. 1 (a), satellites formation is located at moon right side, and formation is flown vertically upward, and the baseline that the moment obtains is covered as in Fig. 2 (a)
Straight line；In Fig. 1 (b), satellites formation flies over 1/4 track, and baseline now is covered as shown in Fig. 2 (b), due to visibility letter
Several conjugate symmetry matter, now complete baseline is covered as two relative sectors in summit；In Fig. 1 (c), work as satellites formation
When completing for 1/2 orbital period, due to conjugate symmetry, it is possible to achieve the baseline full covering of dish distribution, shown in such as Fig. 2 (c).
Fig. 3 describes the relation of threedimensional baseline covering and orbital precession.Wherein, Fig. 3 (a) is orbital precession at 90 degree
Threedimensional baseline is covered, and Fig. 3 (b) is orbital precession to baseline covering during 180 degree；Fig. 3 (c) is orbital precession at 270 degree
Baseline is covered, baseline covering when Fig. 3 (d) is 360 degree of complete track precession period.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention has been described in detail according to embodiment, it will be understood by those within the art that, to technical side of the invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right in the middle of.
Claims (4)
1. a kind of imaging method based on satellites formation, the satellites formation includes multiple satellites, and these satellites are in same rail
On road face, linear formation is formed；The imaging method includes：
Step 1), each satellite in the satellites formation that is flown around celestial body or equivalent center of attraction do intensive adopting in spatial frequency domain
Sample；
Step 2), according to the requirement of imaging, from step 1) obtained by sampled result in choose sampled data, generate corresponding figure
Picture；Wherein,
The step 1) further include：
Step 101), cross-correlation is done in satellites formation between any pair satellite, form the interference baseline of almost linear distribution；Directrix
Property lower each of distribution interfere baseline can to do sampling operation in any instant of track plane flying in satellites formation, obtain sky
Between frequency domain visibility function sampled point；The spatial frequency domain visibility function sampled point is also distributed into almost linear；
Step 102), satellites formation along orbital plane flight when, almost linear distribution interference baseline rotated in two-dimensional space, from
And it is that some concentric circles or helix are distributed baseline is covered by almost linear Distribution evolution, every 1/2 orbital period, complete one time two
The dish-shaped baseline covering of dimension；Each interference baseline does sampling operation in once two dimension dish baseline overwrite procedure, this sampling behaviour
Work is referred to as the two-dimentional visibility function sampling of spatial frequency domain；
Step 103), in the case where celestial mechanics and dynamics of orbits factor drive, orbital plane Temporal Evolution, each orbital plane with it is preceding
One orbital plane shape has angle so that two dimension dish baseline covering is gradually evolved into threedimensional baseline covering；Each interference baseline exists
Sampling operation is done in threedimensional baseline overwrite procedure, the three-dimensional visibility function that this sampling operation is referred to as spatial frequency domain is adopted
Sample；
Step 104), satellites formation in flight course, be that each satellite in formation applies a thrust so that inter-satellite is formed
One speed difference, and then cause that the length of the interference baseline formed two-by-two between satellite is gradually changed, so as to obtain more different long
The baseline of degree；
Step 105), in a cycle of satellites formation expansion and contraction do sampling operation, the sampling operation is referred to as space
The ciphering two-dimension visibility function sampling of frequency domain；
Step 106), in a cycle that satellites formation orbital precession returns to preliminary orbit plane, continuous repeatedly satellites formation
The process of expansion and contraction, while doing sampling operation, the sampling operation is referred to as the encryption three-dimensional visibility letter of spatial frequency domain
Number sampling.
2. the imaging method based on satellites formation according to claim 1, it is characterised in that step 104) further bag
Include：
Step 104-1), be each satellite apply a speed increment so that satellites formation along orbit plane extend, interfere baseline
Length increase；
Step 104-2), after baseline length reaches most Long baselines requirement, to each satellite reversely apply a speed increment, make
Obtain satellites formation to be shunk along orbital plane, interfere the length of baseline to reduce；
Step 104-3), after the length for interfering baseline reaches most short baseline requirement, re-execute step 104-1) so that it is three-dimensional
Interfering the two-dimensional projection of baseline can realize most Long baselines to the complete covering between most short baseline in orbital precession.
3. the imaging method based on satellites formation according to claim 1, it is characterised in that the step 2) further bag
Include：
Step 2-1), based on spatial frequency domain visibility function sampled point with interference baseline information carry out inverting, obtain point target
Image；
Step 2-2), the two-dimentional visibility function sampled data based on spatial frequency domain with interference baseline information carry out inverting, obtain
Take the two dimensional image of point target and extension target in two dimensional surface；
Step 2-3), the three-dimensional visibility function sampled data based on spatial frequency domain with interference baseline information carry out inverting, obtain
Take the 3-D view of point target and extension target in three dimensions；
Step 2-4), the ciphering two-dimension visibility function sampled data based on spatial frequency domain with interference baseline information carry out instead
Drill, obtain the two dimensional image of point target and extension target in two dimensional surface；The picture quality of the two dimensional image is higher than step 2-2)
The picture quality of resulting two dimensional image；
Step 2-5), encryption based on spatial frequency domain three-dimensional visibility function sampled data carries out instead with interference baseline information
Drill, obtain the 3-D view of point target and extension target in three dimensions；The picture quality of the 3-D view is higher than step 2-3)
The picture quality of resulting 3-D view.
4. the imaging method based on satellites formation according to claim 3, it is characterised in that the inverting uses space
The transform method of domain-spatial frequency domain, including fourier transform method, clean algorithm, compressed sensing algorithm, neural network algorithm.
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| CN108008380B (en) * | 2017-11-29 | 2020-03-31 | 中国科学技术大学 | Microwave staring correlated imaging method and system based on satellite formation |
| CN109085586B (en) * | 2018-08-01 | 2020-12-11 | 北京空间飞行器总体设计部 | Four-star Helix formation configuration capable of providing stable long and short baselines |
| CN109188431B (en) * | 2018-09-11 | 2021-04-02 | 合肥工业大学 | Holographic microwave fast imaging method based on compressed sensing |
| CN111017264B (en) * | 2019-10-30 | 2021-12-07 | 中国空间技术研究院 | Efficient three-dimensional remote sensing satellite formation method |
| CN111355899B (en) * | 2020-02-23 | 2021-03-19 | 中国科学院西安光学精密机械研究所 | Space panoramic imaging system and imaging method |
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|---|---|---|---|---|
| CN100344989C (en) * | 2004-11-25 | 2007-10-24 | 中国科学院空间科学与应用研究中心 | Rotary scanning passive microwave imaging primary and secondary satellite system |
| US7413147B2 (en) * | 2005-08-23 | 2008-08-19 | Young Kun Bae | System and method for propellantless photon tether formation flight |
| CN103363959B (en) * | 2013-07-15 | 2015-07-08 | 中国科学院空间科学与应用研究中心 | Stereo surveying and mapping imaging system and method based on separation load satellite formation |
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