CN107907880A  One kind is spaceborne to condense polarization SAR fuzziness analysis system, method and memory  Google Patents
One kind is spaceborne to condense polarization SAR fuzziness analysis system, method and memory Download PDFInfo
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 CN107907880A CN107907880A CN201710913798.2A CN201710913798A CN107907880A CN 107907880 A CN107907880 A CN 107907880A CN 201710913798 A CN201710913798 A CN 201710913798A CN 107907880 A CN107907880 A CN 107907880A
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 G—PHYSICS
 G01—MEASURING; TESTING
 G01S—RADIO DIRECTIONFINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCEDETECTING 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
 G01S13/9076—Polarimetric features in SAR

 G—PHYSICS
 G01—MEASURING; TESTING
 G01S—RADIO DIRECTIONFINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCEDETECTING 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
One kind is spaceborne to condense polarization SAR fuzziness analysis system, method and memory, spaceborne polarization SAR system of condensing is controlled to generate mapping band, mapping is obtained with the corresponding useful signal energy of interior each point, spaceborne polarization SAR system of condensing is controlled to generate multiple fuzzy regions, the corresponding blurred signal energy of each point in each fuzzy region is obtained, the corresponding fuzziness of current point is obtained according to the corresponding useful signal energy in mapping band midpoint, the corresponding blurred signal energy balane in each fuzzy region midpoint.
Description
Technical field
The present invention relates to Space Microwave remote sensing technology field, particularly a kind of spaceborne polarization SAR fuzziness of condensing analyzes system
System, method and memory.
Background technology
In order to meet the SAR quantification applications such as global biomass disturbance monitoring, marine environmental monitoring, satelliteborne SAR load needs
Possess multipolarization pattern, including single polarization, dual polarization, complete polarization and condense polarization mode.SAR complete polarizations pattern is in the application
Good effect is obtained, but faces the problems such as data transfer rate is big, mapping band is smaller, power consumption is larger.It is a kind of to condense polarization mode
Brandnew operating mode, can obtain the quasi complete polarization information of target, and there is no added due to complete polarization pulse recurrence frequency (PRF)
Cause to survey and draw the problem of band halves again.However, due to condensing the polarization factor shadow such as crosstalk and not rounded polar transmitter in polarization mode
Ring, the fuzziness index of system is poor, have impact on effectiveness, and lack effective fuzziness analysis means.It is existing to condense pole
Changing SAR system method for analyzing ambiguity is divided by establishing the method combination satelliteEarth model of target polarization scattering matrix
Analysis, but the influence that the factors such as the not rounded polar transmitter of antenna present in real system and antenna polarization crosstalk are brought is not considered, lead
Cause condenses SAR system fuzziness under polarization mode and analyzes distortion, and then have impact on and condense polarization mode SAR system in agricultural and sea
The application of foreign aspect.
The content of the invention
Present invention solves the technical problem that it is：Overcome the deficiencies of the prior art and provide and a kind of spaceborne condensed polarization SAR mould
Paste degree analysis system, method and memory, solve existing fuzziness analytical technology and do not consider day present in real system
The influence that the factor such as the not rounded polar transmitter of line and antenna polarization crosstalk is brought, causes to condense SAR system fuzziness under polarization mode
Distortion is analyzed, and then have impact on the application for condensing polarization mode SAR system in terms of agricultural and ocean.
The present invention technical solution be：One kind is spaceborne to condense polarization SAR method for analyzing ambiguity, including following step
Suddenly：
(1) the spaceborne mapping band for condensing the generation of polarization SAR system and multiple fuzzy regions are obtained；
(2) according to the corresponding useful signal energy in mapping band midpoint, the corresponding blurred signal energy in each fuzzy region midpoint
The corresponding fuzziness of current point is calculated in amount.
One kind is spaceborne to condense polarization SAR fuzziness analysis system, including not rounded polar transmitter analysis module, reception crosstalk point
Module, fuzziness computing module are analysed, wherein：
Polarization is condensed in not rounded polar transmitter analysis module, the antenna axial ratio parameter introduced using not rounded polar transmitter, calculating
Pattern issues incident polarization vector, and send to fuzziness computing module；
Crosstalk analysis module is received, using the crosstalk parameters that polarize, polarization scattering matrix under polarization mode is condensed in calculating, and is sent
To fuzziness computing module；
Fuzziness computing module, issues incident polarization vector, condenses Polarization scattering under polarization mode according to polarization mode is condensed
Matrix, useful signal energy of the mapping with midpoint, the blurred signal energy balane at each fuzzy region midpoint obtain current point pair
The fuzziness answered.
Useful signal energy P of the mapping with midpoint_{sig}(i) computational methods are：
P_{av}For the spaceborne average emitted power for condensing polarization SAR system,To survey and draw with interior ith point of corresponding hair
Penetrate directivity of antenna,Condensed for mapping with interior ith point corresponding reception antenna directivity factor, λ to be spaceborne
The transmitting signal wavelength of polarization SAR system, c are the light velocity, and L condenses polarization SAR system loss, V to be spaceborne_{s}Polarization is condensed to be spaceborne
The speed of satellite platform movement, θ where SAR system_{i0}To survey and draw with interior ith point corresponding ground incidence angle, M_{RH}、M_{RV}Respectively
For the spaceborne Polarization scattering parameter for condensing polarization SAR system；
The corresponding blurred signal energy P in the fuzzy region midpoint_{amb}The computational methods of (i, j) are：
Wherein,For ith point in jth of fuzzy region corresponding antenna direction of the launch property coefficient,For
Ith point of corresponding antenna receiving directivity coefficient, θ in jth of fuzzy region_{ij}For ith point of correspondence of jth of fuzzy region
Ground incidence angle, R_{ij}For ith point in jth of fuzzy region oblique distance value formed with satellite.
The spaceborne Polarization scattering parameter M for condensing polarization SAR system_{RH}、M_{RV}Computational methods be：
Wherein, δ_{1}To receive antenna cross talk during vertically polarized wave, δ_{2}To receive antenna cross talk during horizontal polarized wave, f_{1}
It is the degree of unbalancedness between twoway receiving channel, T_{H}Launch polarization vector, T to condense horizontal direction in polarization mode_{V}To condense polarization
Vertical direction launches polarization vector in pattern.
Described condenses horizontal direction transmitting polarization vector T in polarization mode_{H}, condense in polarization mode vertical direction and launch
Polarization vector T_{V}Computational methods be：
Wherein,E_{max}For not rounded polar transmitter when antenna electric field form elliptical major semiaxis, E_{min}To be not rounded
Antenna electric field forms elliptical semiminor axis during polar transmitter.
A kind of nontransitory memory, is stored with computer program, which makes the requirement of computer perform claim
1st, any means in claim 3, claim 4 or claim 5.
The present invention compared with prior art the advantages of be：
(1) compared with prior art, the present invention by establishing the collision matrix under the polarization crosstalk of SAR antenna systems, by it
It is introduced into fuzziness analysis equation, solves the problems, such as the influence that fuzziness is analyzed in antenna polarization crosstalk；
(2) compared with prior art, the present invention by establishing SAR antenna systems since the axis under not rounded polar transmitter is than dissipating
Matrix is penetrated, is introduced into fuzziness analysis equation, solves the influence that antenna analyzes fuzziness due to not rounded polar transmitter
Problem；
(3) compared with prior art, the present invention by the way that antenna transmitreceive position property coefficient is incorporated into fuzziness accounting equation
In, have the advantages that to can be applied to the analysis of digital beam froming SAR system fuzziness.
Brief description of the drawings
Fig. 1 is a kind of spaceborne flow chart for condensing polarization SAR method for analyzing ambiguity；
Fig. 2 (a) is the sequence diagram of complete polarization pattern；
Fig. 2 (b) is the sequence diagram for condensing polarization mode；
Fig. 3 is the satelliteEarth model figure of satelliteborne SAR fuzziness analysis；
Fig. 4 is fuzziness analysis result；
Fig. 5 is spaceborne mapping band and confusion region schematic diagram.
Embodiment
In view of the deficiencies of the prior art, the present invention proposes it is a kind of it is spaceborne condense polarization SAR fuzziness analysis system, method and
Memory, solves existing fuzziness analytical technology and does not consider the not rounded polar transmitter of antenna present in real system and antenna
The influence that the factors such as polarization crosstalk are brought, causes to condense SAR system fuzziness under polarization mode and analyzes distortion, and then have impact on letter
Application of the contracting polarization mode SAR system in terms of agricultural and ocean, below in conjunction with the accompanying drawings carries out the method for the present invention further
Explanation and illustration.
It is a kind of spaceborne flow chart for condensing polarization SAR method for analyzing ambiguity as shown in Figure 1, the first step is to be directed to full pole
Change system, considers antenna transmitreceive position property coefficient, mapping band geological information, target polarization scattering characteristics and satelliteorbit information,
The wave position parameter of SAR system work, and the influence of geometric parameters analysis fuzzy region are established according to star, give fuzziness meter
Calculation method, second step are to be directed to condense polarization SAR system performance, consider the mistake introduced after polarization crosstalk and not rounded polar transmitter
Difference, just improves polarization scattering matrix, so as to obtain condensing the method for analyzing ambiguity under polarization.It is of the invention a kind of spaceborne
Polarization SAR method for analyzing ambiguity is condensed to include the following steps：
First, the fuzziness analytical procedure based on polarization scattering matrix
The fuzzy of satelliteborne SAR image is to be made from the echosignal surveyed and drawn outside band to surveying and drawing the interference with interior echosignal
Into image quality decrease, or even there is socalled " ghost image " phenomenon, difficulty is caused to SAR image application.Fuzzy problem is SAR works
Journey design in the major issue to be solved, particularly borne polarization SAR design in obscure the problem of it is even more important, be star
Carry the important indicator of polarization SAR system design.
For Spaceborne SAR System, in radar reception window, since distance is to the side lobe effect of antenna radiation pattern, it is assumed that survey
It is useful energy signal to paint the echosignal with interior target, then survey and draw with several outer preceding exomonental echosignals or after
Several exomonental echosignals are blurred signal energy, and blurred signal energy weighs in time with useful signal energy
It is folded, cause to surveying and drawing the interference with useful signal.
For Spaceborne SAR System, the satelliteEarth model figure that satelliteborne SAR fuzziness is analyzed is illustrated in figure 3.In figure, defend
The height of star platform is H, R_{n}For the corresponding oblique distance of mapping band nearend, R_{f}For the corresponding oblique distance of mapping band distal end, R_{i0}For to mapping
Band carries out ith point of corresponding oblique distance after discretization.
Signal in satelliteborne SAR mapping band is useful echosignal, and the signal surveyed and drawn outside band is fuzzy energy signal, such as
Fig. 5 show spaceborne mapping band and confusion region schematic diagram.In figure, 0 represents to survey and draw with corresponding region, and 1 ...,j ..., 
∞ and 1 ..., j ..., ∞ represents the corresponding region of blurred signal energy.It is R to survey and draw the oblique distance with and satellite at interior ith point_{i0}, it is right
The ground incidence angle and substar visual angle answered are respectively θ_{i0}And γ_{i0}.Ith point of jth of fuzzy region and the oblique distance of satellite are
R_{ij}, corresponding ground incidence angle and substar visual angle are respectively θ_{ij}And γ_{ij}。
According to the definition of fuzziness, fuzziness is the ratio of blurred signal energy and useful signal energy, obtains mapping band
Interior ith point of fuzziness RASR_{mn}For
Wherein, m and n represents transmitting and the polarization received.For complete polarization system, m represents H or V polar transmitters, n
Represent H or V polarization receptions.
P_{sig}(i) it is mapping with interior ith point corresponding useful signal energy, it is related to wave position parameter, it can be expressed as
Wherein, P_{av}For average emitted power,WithRepresent mapping with interior ith point corresponding day linespacing
Descriscent direction of the launch property coefficient and receiving directivity coefficient, λ are the wavelength of transmitting signal, and c is the light velocity, and L is system loss, V_{s}For
The speed of satellite platform movement.For polarization SAR system, backscattering cross product of the target under HH, HV, VH and VV polarization can
To be expressed asCorresponding Polarization scattering S parameter is respectively S_{HH}、S_{HV}、S_{VH}、S_{VV}。
P_{amb}(i, j) is ith point of corresponding fuzzy energy in jth of fuzzy region, can be expressed as
Wherein,WithRepresent ith point of corresponding antenna direction of the launch property coefficient in jth of fuzzy region
With receiving directivity coefficient.For spaceborne digital beam froming SAR system, since its launching beam is broad beam, covering is whole
Band is surveyed and drawn, distance is to directivity factorReception wave beam is narrow beam, and distance is to directivity factorTherefore
Directivity of antenna, which is subject to, to be emulated or surveys.Represent ith point of corresponding offaxis angle in jth of fuzzy region.
R_{ij}Represent the ith point of oblique distance value formed with satellite in jth of fuzzy region, be expressed as
Wherein, R_{i0}Represent mapping with interior ith point of corresponding oblique distance；R_{n}And R_{f}The nearend oblique distance in mapping band is represented respectively
With distal end oblique distance；R_{e}Earth radius and orbit altitude are represented respectively with h；R_{max}Represent satellite oblique distance corresponding with earth section, f_{p}For
Pulse recurrence frequency, is provided by wave position parameter.
According to satelliteEarth model, the distance definition of satellite to earth center is R_{s}=R_{e}+h。
γ_{ij}It can be expressed as
Wherein offaxis angle calculation formula is
Wherein, r represents the roll angle of satellite,
And then obtain fuzziness and be
Wherein, A_{j}For FUZZY WEIGHTED coefficient, can be expressed as
2nd, the polarization scattering matrix under polarization is condensed
For condensing polarization SAR system, it is shown with the difference of transmitting sequential such as Fig. 2 (a), Fig. 2 (b) of complete polarization pattern.
Polarization mode transmitting circular polarisation is condensed, is represented with CP, and two receiving channels receive H and V polar echos at the same time.
Spaceborne polarization SAR system of condensing usually launches righthanded circular polarization, is represented with R, and uses H and V polarization to be carried out at the same time
Receive, its corresponding fuzziness can be expressed as
For condensing polar system, m represents righthanded circular polarization transmitting, and n represents H or V polarization receptions.Condense polar system
Fuzziness has two, is respectively RASR_{RH}And RASR_{RV}。
P_{sig}(i) to survey and draw with interior ith point corresponding useful signal energy, can be expressed as
P_{amb}(i, j) is ith point of corresponding fuzzy energy in jth of fuzzy region, can be expressed as
In polarization SAR system is condensed, M_{RH}And M_{RV}There is certain correspondence with polarization scattering matrix in formula (2), can be with table
It is shown as
Wherein, T_{H}And T_{V}To launch polarization vector, can be expressed as
For condensing polarization mode, since receiving polarization isolation is not high, system is caused to there is polarization crosstalk, therefore
Formula (12) can be expressed as after considering to receive crosstalk
Wherein, δ_{1}And δ_{2}It is antenna cross talk (i.e. a kind of polarization of reception when receiving vertically polarized wave and horizontal polarized wave respectively
The ratio of another polar component is mixed into ripple), f_{1}It is the degree of unbalancedness (including amplitude and phase) between twoway receiving channel, can
To be expressed as
For condensing polarization SAR system, it is generally recognized that it meets
Wherein, R_{HH}Represent the polarization of antenna emission level and be received as the power of horizontal polarization, R_{VH}Represent that antenna transmitting is vertical
Polarize and be received as the power of horizontal polarization, R_{HV}Represent the polarization of antenna emission level and be received as the power of vertical polarization, R_{VV}Table
Show antenna transmitting vertical polarization and be received as the power of vertical polarization.
In polarization SAR system is condensed, since the electromagnetic wave of actual antennas transmitting is unlikely to be preferable circularly polarised wave, lead to
Antenna axial ratio is commonly used to weigh circular polarisation degree, can be expressed as
Wherein, E_{max}And E_{min}For not rounded polar transmitter when antenna electric field form elliptical major semiaxis and semiminor axis.
After the not rounded polar transmitter of consideration system, antenna axial ratio can cause transmitting vector distortion, cause formula (13) to represent
For
Formula (10), formula (11), formula (14) are brought into formula (9), the spaceborne fuzziness condensed under polarization SAR pattern can be calculated
Parameter.
In order to be further illustrated, emulated here with one group of satelliteborne SAR parameter, obtain the mould under wherein RV polarization
It is as shown in Figure 4 to paste curve.In emulation, the height of satellite platform is 850km, mapping swath width 25km, and mapping band center corresponds to
Incidence angle be 35 degree, receive polarize crosstalk δ be 10dB, the axis ratio of antenna is 2.0dB.It is seen that SAR system exists
Condense under polarization mode, fuzziness is superior to 17.5dB, can meet the application requirements such as agricultural and ocean.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (6)
1. one kind is spaceborne to condense polarization SAR method for analyzing ambiguity, it is characterised in that includes the following steps：
(1) the spaceborne mapping band for condensing the generation of polarization SAR system and multiple fuzzy regions are obtained；
(2) according to the corresponding useful signal energy in mapping band midpoint, the corresponding blurred signal energy meter in each fuzzy region midpoint
Calculation obtains the corresponding fuzziness of current point.
2. one kind is spaceborne to condense polarization SAR fuzziness analysis system, it is characterised in that including not rounded polar transmitter analysis module, connects
Crosstalk analysis module, fuzziness computing module are received, wherein：
Polarization mode is condensed in not rounded polar transmitter analysis module, the antenna axial ratio parameter introduced using not rounded polar transmitter, calculating
Incident polarization vector is issued, and is sent to fuzziness computing module；
Crosstalk analysis module is received, using the crosstalk parameters that polarize, polarization scattering matrix under polarization mode is condensed in calculating, and is sent to mould
Paste degree computing module；
Fuzziness computing module, according to condense polarization mode issue incident polarization vector, condense polarization scattering matrix under polarization mode,
Useful signal energy of the mapping with midpoint, the blurred signal energy balane at each fuzzy region midpoint obtain the corresponding mould of current point
Paste degree.
3. one kind according to claim 1 is spaceborne to condense polarization SAR method for analyzing ambiguity, it is characterised in that：Described
Survey and draw the useful signal energy P with midpoint_{sig}(i) computational methods are：
P_{av}For the spaceborne average emitted power for condensing polarization SAR system,To survey and draw with interior ith point corresponding transmitting day
Line directivity factor,For mapping polarization is condensed to be spaceborne with interior ith point corresponding reception antenna directivity factor, λ
The transmitting signal wavelength of SAR system, c are the light velocity, and L condenses polarization SAR system loss, V to be spaceborne_{s}Polarization SAR is condensed to be spaceborne
The speed of satellite platform movement, θ where system_{i0}To survey and draw with interior ith point corresponding ground incidence angle, M_{RH}、M_{RV}Respectively star
Carry the Polarization scattering parameter for condensing polarization SAR system；
The corresponding blurred signal energy P in the fuzzy region midpoint_{amb}The computational methods of (i, j) are：
Wherein,For ith point in jth of fuzzy region corresponding antenna direction of the launch property coefficient,For jth
Ith point of corresponding antenna receiving directivity coefficient, θ in fuzzy region_{ij}It is corresponding for ith point of jth of fuzzy region
Face incidence angle, R_{ij}For ith point in jth of fuzzy region oblique distance value formed with satellite.
4. one kind according to claim 3 is spaceborne to condense polarization SAR method for analyzing ambiguity, it is characterised in that：Described
The spaceborne Polarization scattering parameter M for condensing polarization SAR system_{RH}、M_{RV}Computational methods be：
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Wherein, δ_{1}To receive antenna cross talk during vertically polarized wave, δ_{2}To receive antenna cross talk during horizontal polarized wave, f_{1}It is two
Degree of unbalancedness between the receiving channel of road, T_{H}Launch polarization vector, T to condense horizontal direction in polarization mode_{V}To condense polarization mode
Middle vertical direction launches polarization vector.
5. one kind according to claim 4 is spaceborne to condense polarization SAR method for analyzing ambiguity, it is characterised in that：Described
Condense horizontal direction transmitting polarization vector T in polarization mode_{H}, condense in polarization mode vertical direction transmitting polarization vector T_{V}Meter
Calculation method is：
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Wherein,E_{max}For not rounded polar transmitter when antenna electric field form elliptical major semiaxis, E_{min}Sent out for noncircular polarisation
Antenna electric field forms elliptical semiminor axis when penetrating.
A kind of 6. nontransitory memory, it is characterised in that：Computer program is stored with, which perform computer
Any means in claim 1, claim 3, claim 4 or claim 5.
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