A 3D positioning method for multi-scene interference SAR images

Abstract

The invention discloses a multi-scene interference SAR image three-dimensional positioning method. The positioning method is concise and efficient in flow and convenient for automatic and batched computer processing, realizes the positioning of three-dimensional positions, and can prevent the tediousness of the same name point transmission path design in the prior art by constructing a multi-scene three-dimensional combined sensitivity matrix. The positioning method includes that the three-dimensional positions of the east position (longitude), the north position (latitude) and the elevation are simultaneously positioned, and the three-dimensional positioning is realized by simultaneously performing the three-dimensional position interference scaling on the SAR data of multiple scenes. According to the invention, by constructing the multi-scene three-dimensional combined sensitivity matrix, all of the scaled parameters of the multiple scenes interfering the SAR are subjected to the iterative computation simultaneously, the positioning precision of each scene and the position coherence at the scene adjacency part can be guaranteed, and the tediousness of the same name point transmission path design in the prior art can be prevented.

Description

technical field [0001] The invention relates to the technical field of three-dimensional positioning methods, in particular to a three-dimensional positioning method for multi-scene interference SAR images. Background technique [0002] Interferometric SAR technology is a combination of synthetic aperture radar technology and interferometric technology. Interferometric SAR observes the same scene through two antennas at different positions, and uses radar echo acquisition and data processing to obtain the SAR image and interferometric phase data of the scene. The interferometric phase data is processed by interferometric calibration, and the three-dimensional position of the SAR pixel is retrieved by using the interferometric phase data after interferometric calibration. [0003] Three-dimensional positioning is a necessary prerequisite for the application of interferometric SAR images. The so-called three-dimensional positioning refers to obtaining the east-west position (l...

AI Technical Summary

Problems solved by technology

However, the existing multi-scene joint calibration method usually adopts the transfer of position information of the same point (Tie Point, TP, connection point, also known as the same name point, that is, the pixel corresponding to the same object in different SAR scenes) However, the implementation process is cumbersome and inconvenient for automatic processing; and it is only for elevation positioning, and less involves three-dimensional position positioning at the same time. There are optimizations and improvements related to the processing flow, and it is not convenient to use computers for automated and batch processing

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