Geo-SAR satellite front-side view imaging attitude angle calculation method based on single reflector antenna

Abstract

The invention discloses a Geo-SAR satellite front-side view imaging attitude angle calculation method based on a single reflector antenna. The method comprises the steps: determining a mechanism for generating SAR satellite squint angle formation and deviation through satellite-ground geometric relation modeling, carrying out simulation analysis on the squint angle characteristics of a geosynchronous orbit SAR under typical orbit parameters, and based on an SAR satellite zero Doppler surface vector analysis algorithm, calculating a pitch angle and a rolling angle which need to be adjusted in atwo-dimensional pitch rolling guidance method, and a squint angle value after guidance. According to the pitching and rolling two-dimensional attitude guidance algorithm provided by the invention, the pitching angle and the rolling angle required to be adjusted by the satellite can be accurately calculated, the attitude angle required to be adjusted is reduced by at least one order of magnitude compared with a two-dimensional yaw guidance method, and the maneuvering speed of the satellite is improved by at least one order of magnitude.

Description

technical field [0001] The invention belongs to the technical field of the overall design of geosynchronous orbit microwave remote sensing satellites, and in particular relates to a method for calculating the attitude angle of front-view and side-view imaging of Geo-SAR satellites based on a single reflector antenna. Background technique [0002] When a satellite operates in a geosynchronous orbit with a fixed number of six orbits, it will produce a yaw angle due to the influence of the earth's rotation, and further produce a pitch angle under the action of the orbital eccentricity. Under the combined action of the two, the satellite beam will produce a constant period of inclination. Angle of view, which changes periodically with the orbital position of the satellite. In order to realize the front and side view of the satellite, it is necessary to correct the center of the radar beam so that it is always perpendicular to the satellite heading, so as to reduce the distance / a...

AI Technical Summary

Problems solved by technology

However, due to the orbital characteristics of geosynchronous orbit SAR, its yaw angle is usually at least one order of magnitude larger than that of low-orbit SAR satellites, and the rate of change of this angle is extremely fast, so it is necessary to study new methods to solve this problem

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