CN108761453A - A kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions - Google Patents
A kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions Download PDFInfo
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- CN108761453A CN108761453A CN201810271654.6A CN201810271654A CN108761453A CN 108761453 A CN108761453 A CN 108761453A CN 201810271654 A CN201810271654 A CN 201810271654A CN 108761453 A CN108761453 A CN 108761453A
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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
- G01S13/9027—Pattern recognition for feature extraction
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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Abstract
A kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions, it is determined by the imaging region collectively covered to SAR satellites and optical satellite, overlay area is obtained to overlay area progress rasterizing again and corresponds to geocentric angle sequence, calculate separately to obtain resolution ratio after SAR satellites and optical satellite side view finally by geocentric angle sequence, it is optimal to achieve the purpose that optical imagery in SAR image merges common imaging effect, it is high to calculate accuracy, reliability is high.
Description
Technical field
The present invention relates to the imaged viewing angle optimization methods of a kind of optical satellite and SAR Satellite Images Fusions, belong to remote sensing and defend
Star field.
Background technology
In remote sensing satellite field, optical satellite and SAR satellites are two kinds of the most commonly used imaging satellites, most right
Satellite remote sensing images have the use of demand to have a large amount of demand to Optical satellite images and SAR image per family.Optical remote sensing be imaged with
The advantage and disadvantage of SAR remotely sensed images have certain complementarity and an irreplaceability, therefore by remote sensing image and SAR remote sensing images
It is of great value to carry out fusion application, and satellite remote sensing engineering and a frontier of application study in recent years.In order to carry
The syncretizing effect of high remote sensing image and SAR remote sensing images, on the one hand can in satellite system design by two class satellites into
On the other hand row co-design then needs to take appropriate measures in terms of image fusion technology.Satellite engineering system is set
It for meter, is used cooperatively on operating mode using optical satellite and SAR satellites, it will for melting for optics and SAR remote sensing images
The development of conjunction technology provides important condition.
In recent years, the engineer and researcher of domestic and international application system are at optics is merged with SAR remote sensing images
Research, application and exploration have been carried out in terms of reason, different airborne and spaceborne remotely-sensed datas are carried out fusion treatment, are achieved certain
Achievement and application effect.However, optical satellite and SAR design of satellites both domestic and external and imaging use are all relatively independent at present,
That is, be used for doing the optics of remote sensing image fusion at present and SAR image derives from incoherent design vector, it is this not
The image that relevant carriers are provided objectively is causing certain difficulty to image co-registration, also largely affects figure
The syncretizing effect and application value of picture.Currently, the design of optical satellite and SAR satellites in engineering also in relatively independent shape
State, it is primary premise that the determination of design scheme, which is still based on the independent best performance of respective satellite, there is no for image co-registration and
The constellation of progress or formation flight design.
Invention content
Present invention solves the technical problem that being：For in currently available technology not towards optical satellite and SAR satellite mappings
As the joint imaging pattern of fusion, it is proposed that a kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions is filled out
The blank of the optimal optical satellite side-sway of oriented integration network image quality and SAR satellite side view best match angle computational methods is mended.
The present invention solves above-mentioned technical problem and is achieved by following technical solution：
A kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions, steps are as follows：
(1) resolution ratio after SAR satellite side views is determined according to the local incident angle α of SAR satellites；
(2) according to the real-time track height of SAR satellites and optical satellite, SAR satellite beams central sides visual angle, optical satellite
Lateral swinging angle, the real-time field angle of SAR satellite beams angle, optical satellite calculate the overlay area of SAR satellites and optical satellite accordingly
Heart angle；
(3) rasterizing segmentation is carried out to the overlay area size that step (2) determines, and obtains all grid points pair after segmentation
The geocentric angle sequence answered；
(4) SAR satellites and optical satellite are calculated when the point is imaged according to geocentric angle sequence obtained by step (3), SAR satellites
The earth's core subtended angle sequence corresponding with optical satellite；
(5) resolution ratio sequence after obtaining SAR satellites side view corresponding with the earth's core subtended angle sequence when SAR satellite imageries is calculated
Row；
(6) according to the field angle of optical satellite, optical satellite lateral swinging angle, optical satellite real-time track height and optical satellite
Lateral swinging angle and resolution sequence after the incidence angle transforming relationship calculating optical satellite side view of optical satellite ground；
(7) according to resolution sequence calculating difference square sequence obtained by step (5), step (6), the minimum in sequence is chosen
It is worth corresponding optical satellite lateral swinging angle and SAR satellite side views angle as optimal angle.
In the step (1), imaging point pixel resolution ρ after SAR satellite side viewsgCalculation formula be：
In formula, θ1For SAR satellite side views angle, H1For SAR satellite real-time track height, α is current time SAR satellite imagery
The ground incidence angle of point, c is the light velocity, and T is pulse width, and R is earth radius, and α ' is the ground of current time optical satellite imaging point
Face incidence angle.
In the step (2), the overlay area of SAR satellites and optical satellite corresponds to geocentric angle d0Computational methods be：
In formula, H1For SAR satellite real-time track height, θ1For SAR satellite beams central sides visual angle, SOV is SAR satellite waves
Beam angle, R are earth radius.
In the step (4), the covering area range obtained by step (3), which carries out rasterizing, makes it be evenly dividing for N
A point simultaneously obtains grid point sequence { ξ }, and the earth's core is obtained according to each point and its former point and the corresponding the earth's core subtended angle of the earth's core point
Angle sequence { d0}。
In the step (5), the corresponding the earth's core subtended angle sequence { d of SAR satellitesSARCalculation formula is as follows：
In formula, d1For distance SAR sub-satellite point closest approaches corresponding SAR satellites the earth's core subtended angle in fusion of imaging region；
The corresponding the earth's core subtended angle sequence { d of optical satelliteOpticsCalculation formula is as follows：
In formula, d2To be opened apart from the corresponding optical satellite the earth's core of optical satellite substar closest approach in fusion of imaging region
Angle；
In the step (7), optical satellite lateral swinging angle θ2With optical satellite ground incident angle α ' conversion formula it is as follows：
In formula, FOV is the field angle of optical satellite, H2For optical satellite real-time track height, R is earth radius, and R is ground
The radius of a ball, θ2For optical satellite lateral swinging angle, α ' is the ground incidence angle of current time optical satellite imaging point.
In the step (7), pixel resolution GSD after optical satellite side viewCCalculation formula be：
In formula, IFOV is the instantaneous field of view angle of optical satellite.
In the step (8), to imaging point pixel after pixel resolution sequence, SAR satellite side views after optical satellite side view
Resolution sequence optimizes calculating, and calculation formula is as follows：
Φmin(θ2)=min [Φ (θ2)]
In formula, [GSDc (ξ, θ2)] it is pixel resolution sequence after optical satellite side view, [ρg(ξ)] for after SAR satellite side views
Imaging point pixel resolution sequence, Φ (θ2) be optimization calculate after optical satellite be imaged side view angle corresponds to resolution ratio difference put down
Fang Xulie, Φmin(θ2) it is that optimal optical satellite imaging side view angle corresponds to resolution ratio.
The advantages of the present invention over the prior art are that：
(1) it the present invention provides the imaged viewing angle optimization method of a kind of optical satellite and SAR Satellite Images Fusions, solves
In the engineering design of optical satellite and SAR satellites it is relatively independent and cannot be directed to fusion of imaging carry out universal design the problem of, fill out
The blank of the optical satellite side-sway and the design of SAR satellite side view best match angle of fusion of imaging optimal quality is mended；
(2) present invention, which can be calculated fast and accurately, defends towards the optimal satellite side view angles SAR of image co-registration with optics
Star lateral swinging angle sequence；It is directed to the arbitrary side view angle of SAR satellites of the same area imaging, calculates matching optical satellite most
Excellent lateral swinging angle, the picture quality after the acquired double star image of side-sway imaging will be such that it merges at this angle are optimal.
Description of the drawings
Fig. 1 is the satellite imagery schematic diagram that invention provides；
Specific implementation mode
A kind of imaged viewing angle optimization method of optical satellite and SAR Satellite Images Fusions, SAR satellites are imaged with optical satellite
Situation is as shown in Figure 1, be as follows：
(1) computational methods of resolution ratio after SAR satellite side views are determined according to the ground incident angle α of SAR satellites, wherein SAR
Pixel resolution ρ after satellite side viewgCalculation formula be：
In formula, α is current time SAR satellite ground incidence angle, i.e., the angle of wave beam and local vertical, c are the light velocity, and T is
Pulse width；
(2) according to the real-time track height of SAR satellites and optical satellite, SAR satellite beams central sides visual angle, optical satellite
Lateral swinging angle, the real-time field angle of SAR satellite beams angle, optical satellite calculate the overlay area of SAR satellites and optical satellite accordingly
Heart angle, wherein the overlay area of SAR satellites and optical satellite corresponds to geocentric angle d0Computational methods be：
In formula, H1For SAR satellite real-time track height, θ1For SAR satellite beams central sides visual angle, SOV is SAR satellite waves
Beam angle, R are earth radius.
(3) geocentric angle is corresponded to according to step (2) institute overlay area and calculates corresponding covering area range, that is, utilize earth perimeter
Covering area range width is determined with the ratio relation of geocentric angle；
(4) rasterizing segmentation is carried out to the overlay area size that step (3) determines, so that it is evenly dividing for N number of point and obtained
To grid point sequence { ξ }, the earth's core subtended angle answered according to each pair of point obtains the earth's core subtended angle sequence { d0}；
(5) SAR satellites and optical satellite are calculated when the point is imaged according to geocentric angle sequence obtained by step (4), SAR satellites
The earth's core subtended angle sequence corresponding with optical satellite, wherein the corresponding the earth's core subtended angle sequence { d of SAR satellitesSARCalculation formula
It is as follows：
In formula, d1For distance SAR sub-satellite point closest approaches corresponding SAR satellites the earth's core subtended angle in fusion of imaging region；
The corresponding the earth's core subtended angle sequence { d of optical satelliteOpticsCalculation formula is as follows：
In formula, d2To be opened apart from the corresponding optical satellite the earth's core of optical satellite substar closest approach in fusion of imaging region
Angle；
(6) SAR is calculated according to SAR satellites obtained by resolution ratio computational methods obtained by step (1), step (2) and step (5) to defend
Resolution sequence after star side view；
(7) light is calculated according to the instantaneous field of view angle of optical satellite, optical satellite lateral swinging angle, optical satellite real-time track height
Resolution sequence line passes through optical satellite lateral swinging angle θ after learning satellite side view2With optical satellite ground incident angle α ' angular relationship
It is converted, conversion formula is as follows：
Pixel resolution GSD after optical satellite side viewCCalculation formula be：
In formula, IFOV is the instantaneous field of view angle of optical satellite, θ2For optical satellite lateral swinging angle, H2For the real-time rail of optical satellite
Road height.
According to the design objective of optical satellite and SAR satellites itself, according to being differentiated after optical satellite side view obtained by step (7)
Resolution sequence optimizes after SAR satellite side views obtained by rate sequence, step (2), then calculates the two towards image co-registration
Imaging pattern in best match side view angle, convenient for user propose optical imagery merged with SAR image demand when,
Optimal imaging side view angle is directly given convenient for satellite.
In the step (8), to imaging point pixel after pixel resolution sequence, SAR satellite side views after optical satellite side view
Resolution sequence optimizes calculating, and calculation formula is as follows：
Φmin(θ2)=min [Φ (θ2)]
In formula, [GSDc (ξ, θ2)] it is pixel resolution sequence after optical satellite side view, [ρg(ξ)] for after SAR satellite side views
Imaging point pixel resolution sequence, Φ (θ2) be optimization calculate after optical satellite be imaged side view angle corresponds to resolution ratio difference put down
Fang Xulie, Φmin(θ2) it is that optimal optical satellite imaging side view angle corresponds to resolution ratio.With SAR satellites side view angle theta1A system
Row changing value can obtain optical satellite lateral swinging angle θ2A series of optimal respective values.
The content that description in the present invention is not described in detail belongs to the known technology of those skilled in the art.
Claims (8)
1. the imaged viewing angle optimization method of a kind of optical satellite and SAR Satellite Images Fusions, it is characterised in that steps are as follows：
(1) resolution ratio after SAR satellite side views is determined according to the local incident angle α of SAR satellites；
(2) according to the real-time track height of SAR satellites and optical satellite, SAR satellite beams central sides visual angle, optical satellite side-sway
Angle, SAR satellite beams angle, the real-time field angle of optical satellite calculates SAR satellites and the overlay area of optical satellite corresponds to geocentric angle；
(3) rasterizing segmentation is carried out to the overlay area size that step (2) determines, and all grid points are corresponding after obtaining segmentation
Geocentric angle sequence；
(4) SAR satellites and optical satellite are calculated when the point is imaged according to geocentric angle sequence obtained by step (3), SAR satellites and light
Learn the corresponding the earth's core subtended angle sequence of satellite；
(5) resolution sequence after obtaining SAR satellites side view corresponding with the earth's core subtended angle sequence when SAR satellite imageries is calculated；
(6) according to the field angle of optical satellite, optical satellite lateral swinging angle, optical satellite real-time track height and optical satellite side-sway
Angle and resolution sequence after the incidence angle transforming relationship calculating optical satellite side view of optical satellite ground；
(7) according to resolution sequence calculating difference square sequence obtained by step (5), step (6), the minimum value pair in sequence is chosen
The optical satellite lateral swinging angle answered and SAR satellite side views angle are as optimal angle.
2. the imaged viewing angle optimization method of a kind of optical satellite according to claim 1 and SAR Satellite Images Fusions, special
Sign is：In the step (1), imaging point pixel resolution ρ after SAR satellite side viewsgCalculation formula be：
In formula, θ1For SAR satellite side views angle, H1For SAR satellite real-time track height, α is current time SAR satellite imagery point
Ground incidence angle, c are the light velocity, and T is pulse width, and R is earth radius, and α ' is that the ground of current time optical satellite imaging point enters
Firing angle.
3. the imaged viewing angle optimization method of a kind of optical satellite according to claim 1 and SAR Satellite Images Fusions, special
Sign is：In the step (2), the overlay area of SAR satellites and optical satellite corresponds to geocentric angle d0Computational methods be：
In formula, H1For SAR satellite real-time track height, θ1For SAR satellite beams central sides visual angle, SOV is SAR satellite beams angle,
R is earth radius.
4. the imaged viewing angle optimization method of a kind of optical satellite according to claim 3 and SAR Satellite Images Fusions, special
Sign is：In the step (4), the covering area range obtained by step (3) carries out rasterizing it is made to be evenly dividing being N number of
Grid point sequence { ξ } is put and obtained, the earth's core subtended angle is obtained according to each point and its former point and the corresponding the earth's core subtended angle of the earth's core point
Sequence { d0}。
5. the imaged viewing angle optimization method of a kind of optical satellite according to claim 4 and SAR Satellite Images Fusions, special
Sign is：In the step (5), the corresponding the earth's core subtended angle sequence { d of SAR satellitesSARCalculation formula is as follows：
In formula, d1For distance SAR sub-satellite point closest approaches corresponding SAR satellites the earth's core subtended angle in fusion of imaging region；
The corresponding the earth's core subtended angle sequence { d of optical satelliteOpticsCalculation formula is as follows：
In formula, d2For in fusion of imaging region apart from the corresponding optical satellite the earth's core subtended angle of optical satellite substar closest approach.
6. the imaged viewing angle optimization method of a kind of optical satellite according to claim 1 and SAR Satellite Images Fusions, special
Sign is：In the step (7), optical satellite lateral swinging angle θ2With optical satellite ground incident angle α ' conversion formula it is as follows：
In formula, FOV is the field angle of optical satellite, H2For optical satellite real-time track height, R is earth radius, and R is the earth half
Diameter, θ2For optical satellite lateral swinging angle, α ' is the ground incidence angle of current time optical satellite imaging point.
7. the imaged viewing angle optimization method of a kind of optical satellite according to claim 6 and SAR Satellite Images Fusions, special
Sign is：In the step (7), pixel resolution GSD after optical satellite side viewCCalculation formula be：
In formula, IFOV is the instantaneous field of view angle of optical satellite.
8. the imaged viewing angle optimization method of a kind of optical satellite according to claim 7 and SAR Satellite Images Fusions, special
Sign is：In the step (8), to imaging point pixel after pixel resolution sequence, SAR satellite side views after optical satellite side view point
Resolution sequence optimizes calculating, and calculation formula is as follows：
Φmin(θ2)=min [Φ (θ2)]
In formula, [GSDc (ξ, θ2)] it is pixel resolution sequence after optical satellite side view, [ρg(ξ)] be SAR satellite side views after be imaged
Point pixel resolution sequence, Φ (θ2) it is to optimize the optical satellite imaging side view angle after calculating to correspond to resolution ratio squared difference sequence
Row, Φmin(θ2) it is that optimal optical satellite imaging side view angle corresponds to resolution ratio.
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