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SAR stereoscopic model construction and measurement method

A stereo model and measurement technology, applied in the field of synthetic aperture radar stereo mapping, can solve the problem of inconsistency in image scale

Active Publication Date: 2015-12-09
CHINESE ACAD OF SURVEYING & MAPPING
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Problems solved by technology

[0004] The purpose of the present invention is to realize the construction of SAR stereo model and three-dimensional measurement, and proposes a method of construction and measurement of SAR stereo model, which can improve the problem of inconsistency of image scale through the conversion of oblique ground distance, and eliminate it through resolution resampling and rotation transformation Stereo image pairs up and down parallax to obtain good stereo vision. At the same time, according to image geometric transformation parameters and stereo positioning model, construct a stereo measurement model for SAR stereo mapping to extract high-precision 3D terrain information

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051] First, using the geometric imaging parameters of the SAR image and the state vector parameters of the sensor platform, a geometric positioning model is established, and the direct conversion relationship between geographic coordinates (X, Y, Z) and image coordinates (x, y) is established. Using the range-Doppler (R-D) model as the geometric positioning model, with F R , F D represent the functions corresponding to the distance condition and the Doppler condition respectively, and the positioning model equation can be expressed as:

[0052] f R (X,Y,Z,x,y)=0

[0053] (F R , F D meaning)

[0054] f D (X,Y,Z,x,y)=0

[0055] Then, according to the azimuth resolution and the range resolution of the left image, resolution resampling is performed on the right image of the SAR stereo pair, so that the resolution of the right image is consistent with th...

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Abstract

The invention relates to an SAR (synthetic Aperture Radar) stereoscopic model construction and measurement method, and the method comprises the steps: firstly carrying out SRGR (the slant range to ground range) transformation of an original SAR stereoscopic image; secondly carrying out the rotation transformation of a right sheet of a stereopair, and obtaining an ideal stereopair; and then building a three-dimensional stereoscopic measurement model according to an original SAR stereoscopic geometric model, thereby obtaining a stereoscopic model for stereoscopic mapping. The method can eliminate the vertical parallax of the SAR stereopair, obtains a better stereoscopic visual effect, and builds a high-precision stereoscopic measurement model which is used for extracting three-dimensional information of a terrain. The scheme provided by the invention plays an important role in the SAR topographic mapping, and the invention has better technical effects.

Description

technical field [0001] The invention belongs to the field of digital photogrammetry of remote sensing images, in particular to synthetic aperture radar (Synthetic Aperture Radar, SAR) stereogrammetry. Background technique [0002] The main purpose of synthetic aperture radar SAR stereo mapping is to use SAR stereo data to extract terrain and surface object information. Stereo SAR and interferometric SAR are both means to extract three-dimensional terrain information. In theory, interferometric SAR can obtain higher-precision three-dimensional terrain information, but it has very strict requirements on system parameters and data time intervals, and the success rate of using interferometric SAR to extract DEM is low. , especially in the western alpine region, due to the large terrain undulations and dense vegetation coverage, it is difficult to obtain ideal interference processing results in a large area. Compared with interferometric data, SAR stereo data is relatively easy ...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9005G01S13/9004
Inventor 杨书成黄国满张继贤赵争段连飞
Owner CHINESE ACAD OF SURVEYING & MAPPING