Method for Accurately Obtaining Beam Pointing of Satellite Radar Antenna

Abstract

The present invention provides a method for accurately obtaining satellite radar antenna beam pointing, including the following: (1) the satellite is equipped with a microwave transmitting antenna, a laser transmitter and a star sensor, wherein the transmitting antenna and the laser transmitter have a common reference Baseline, the transmitting antenna is located in front of the satellite radar antenna and points to the radar antenna; (2) The transmitting antenna transmits microwaves to the radar antenna, and the radar antenna receives and obtains the direction of the microwave beam in the transmitting antenna coordinate system, and inverts to obtain the external direction of the radar antenna in the transmitting antenna coordinate system. Beam pointing when emitting microwaves; (3) At the same time as (2), the laser transmitter emits laser light into the star sensor, and the star sensor obtains the beam pointing and the position of the laser transmitter in the star sensor coordinate system. The invention converts the on-board optical reference and the microwave electrical reference, directly converts the microwave beam pointing information into the satellite star sensor coordinate system for description, and accurately obtains the on-orbit pointing information of the beam.

Description

technical field [0001] The invention relates to the field of satellites, in particular to a method for accurately obtaining the beam direction of a satellite radar antenna. Background technique [0002] Synthetic aperture radar is an active earth observation system that can be installed on aircraft, satellites and other flying platforms to implement all-day and all-weather earth observation. Because of its unique advantages in disaster monitoring, environmental monitoring, ocean observation and resource exploration, it has attracted more and more attention from all over the world. Especially with the rapid development of aerospace technology in recent years, more and more radar payloads have been applied to space observation of the earth, and spaceborne microwave radar payloads in the form of phased arrays and paraboloids have appeared one after another. [0003] For spaceborne microwave radar payloads, its primary application is earth observation imaging. Therefore, whethe...

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Problems solved by technology

[0005] Although many researches and engineering implementation attempts have been made to improve the pointing accuracy of microwave beams of spaceborne radar payloads, there are still some problems, such as high degree of simplification of system principles, complex engineering application implementation, and the influence of space environment such as orbital thermal environment. Larger and other deficiencies

[0006] Aiming at these application deficiencies, the present invention provides a method for accurately obtaining satellite radar antenna beam pointing, in order to solve many constraints and deficiencies in the prior art from the engineering implementation level

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