Elevation inversion method for geosynchronous orbit synthetic aperture radar interference

Abstract

The invention provides an elevation inversion method for geosynchronous orbit synthetic aperture radar interference. The method comprises the steps that step 1, GEO SAR is selected to obtain a track of interference data, and the interference data on the track are collected; step 2, GEO SAR imaging processing is conducted through a BP algorithm according to the interference data obtained in step 1; step 3, a GEO interference model is built according to the GEO SAR image processed in step 2, and when a phase position vector is separated from an imaging plane, the GEO SAR interference elevation inversion is conducted according to the GEO interference model. According to the elevation inversion method for the geosynchronous orbit synthetic aperture radar interference, due to the fact that the reasonable GEO SAR interference model is built, the effective elevation inversion processing under the condition that the phase position vector and the imaging plane are separated is achieved, the core problem of the elevation inversion of the GEO SAR interference processing, namely, the separation problem of the effective phase position vector and the imaging plane is solved, and the elevation inversion of the GEO SAR interference processing at any position is achieved.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar, in particular to an elevation inversion method for geosynchronous orbit synthetic aperture radar interference. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-time high-resolution microwave remote sensing imaging radar that can be installed on aircraft, satellites, missiles and other flying platforms. Since its invention in the 1950s, it has been widely used in many fields, such as disaster control, vegetation analysis, microwave remote sensing and other fields. Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) is a SAR satellite operating on a geosynchronous elliptical orbit at a height of 36000km. Compared with low-orbit SAR (LEO SAR, the orbit height is lower than 1000Km), GEO SAR has the characteristics of large imaging range, short revisit time, and strong anti-strike and anti-destruction capabilities. It has become a research hotsp...

AI Technical Summary

Problems solved by technology

This separation will lead to serious failure of the traditional low-orbit elevation inversion interference model (sometimes the difference can be 10 times); at the same time, because GEO interferometry has the characteristics of large-scene interference processing, but for the target points on the edge of the large scene, the low-orbit elevation is used When the inversion interference model is processed, the calculated fuzzy height will also differ greatly from the real value, which will lead to a multi-period target scene with an elevation error of tens of meters or even hundreds of meters.

Therefore, the core problem of GEO SAR interferometric processing is how to solve the problem of separating the effective phase vector from the imaging plane and achieve better accuracy, which is not mentioned in the existing GEO SAR interferometric processing algorithms

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