Radar beam center irradiation point determination method and device and storage medium

Abstract

The invention relates to a radar beam center irradiation point determination method and device and a storage medium. The method comprises the steps: reading coded disc data of a servo platform and measurement data of a position attitude measurement unit; constructing an antenna beam center direction unit vector; calculating a coordinate vector of the antenna beam center direction unit vector in an earth-centered earth-fixed coordinate system according to the coded disc data and the measurement data; constructing an antenna beam center direction linear equation and an earth surface ellipsoid equation according to the coordinate vectors under the earth-centered earth-fixed coordinate system; determining a radar beam center irradiation point according to coordinates of an intersection point of the antenna beam center direction linear equation and the earth surface ellipsoid equation; and determining the radar beam center irradiation point through the coordinates of the intersection point of the linear equation and the earth surface ellipsoid equation. The bending factor of the earth is considered, accurate determination of the synthetic aperture radar beam center irradiation point can be achieved, practicability is high, errors are small, and the method serves as a key step in synthetic aperture radar imaging and is suitable for achieving a real-time processing board card.

Description

technical field [0001] The invention relates to the field of synthetic aperture radar, in particular to a method, a device and a storage medium for determining an irradiation point at the center of a radar beam. Background technique [0002] Synthetic Aperture Radar (SAR) can achieve flexible observation by controlling the beam pointing during the working process, especially in the scanning mode to achieve coverage of a large area. However, in data post-processing and engineering applications, if local imaging of an area of ​​interest is to be performed, it is necessary to judge from the data whether the area is covered by the beam. Therefore, it is necessary to calculate the beam center irradiation point according to the radar antenna pointing and position attitude parameters. exact location. [0003] In view of this problem, the current method can only solve the position of the irradiation point of the center of the beam through the assumption of a flat earth; however, at...

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Problems solved by technology

[0003] In view of this problem, the current method can only solve the position of the irradiation point of the center of the beam through the assumption of a flat earth; however, at a large observation distance, the curvature of the earth is a factor that needs to be considered. Solving the position of the irradiation point of the center of the beam through the assumption of a flat earth will introduce a large The position calculation error of

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