An Optimal Phase Estimation Method for Full-polarization Interferometric Synthetic Aperture Radar Image Based on Hybrid Mode
A technique of interferometric synthetic aperture and mixed mode, applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc.
Active Publication Date: 2016-05-11
CHINESE ACAD OF SURVEYING & MAPPING
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[0005] The purpose of the present invention is to develop a new optimal phase estimation technology for the mixed-mode full-polarization interferometric synthetic aperture radar system, reduce the influence of baseline error on elevation error in the existing polarization optimal coherent phase estimation technology, Overcome the disadvantage of large phase error caused by low coherence area in multi-baseline technology
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[0048] The optimal phase estimation method based on mixed-mode full-polarization interferometric synthetic aperture radar image provided by the present invention is to process the mixed-mode full-polarization interferometric synthetic aperture radar image, and the mixed mode includes alternating single-shot and double-receive mode, or the integrated mode of single transmission and double reception and single transmission and single reception, this method can reduce the influence of baseline error on elevation error, and can also overcome the disadvantage of large phase error caused by low coherence area. On the one hand, it ensures that the interferometric phase has the highest coherence, on the other hand, it has the advantages of easy phase unwrapping processing for short baseline interferometry and high elevation sensitivity for long baseline interferometry, thereby improving the accuracy of elevation measurement.
[0049] Attached below figure 1 The present invention is de...
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The invention provides an optimal phase-position estimating method for a complete polarization interferometric synthetic aperture radar image based on a mixed mode, and the complete polarization interferometric synthetic aperture radar image based on the mixed mode is processed. The method comprises the first step of obtaining the complete polarization interferometric synthetic aperture radar image based on the mixed mode, the second step of generating a single scattering mechanism vector, the third step of generating an optimal coherent image of a single scattering mechanism, the fourth step of establishing a complete polarization interferometric phase position model and the fifth step of estimating a maximum likelihood phase position. According to the method, existing synthetic aperture radar interferometry and complete polarization interferometric measuring precision can be improved, the optimal phase-position estimating method can play an important role in the aspect that a complete polarization interferometric synthetic aperture radar system based on an onboard or satellite borne mixed mode is applied to carrying out the earth surface three-dimensional reconstruction, and the method has the optimal technology effect.
Description
technical field [0001] The invention belongs to the field of digital photogrammetry of remote sensing images, in particular to an optimal phase estimation method of full polarization interference synthetic aperture radar images based on mixed modes. Background technique [0002] As an active microwave remote sensing technology, Interferometric Synthetic Aperture Radar (InSAR) has shown more and more advantages in terrain mapping. The phase estimation of synthetic aperture radar images is a key step in extracting high-precision terrain information. It obtains the interferometric phase representing terrain information through a certain phase estimation method, but it is usually affected by various errors, mainly as follows: (1) orbit / attitude (2) errors caused by time, space decorrelation and thermal noise; (3) errors caused by the disturbance of the atmospheric difference caused by interference on the imaging time of the image. [0003] Generally speaking, there are two main...
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IPC IPC(8): G01S13/90
CPCG01S7/024G01S13/9023G01S13/904G01S13/935G01S13/9076
Inventor 卢丽君张继贤燕琴黄国满赵争杨书成
Owner CHINESE ACAD OF SURVEYING & MAPPING