Pointing accuracy calculation method for spaceborne deployable antenna system

Abstract

The invention provides a pointing accuracy calculation method for a spaceborne deployable antenna system. The deployable antenna system comprises a feed source and a reflection surface, wherein the feed source is fixedly mounted on a satellite body, and the reflection surface is connected with the satellite body through M cascaded deployment arms. The method includes the following steps that: (1)a feed source body coordinate system SigmaF, each of deployment arm body coordinate systems Sigma1 to SigmaM, and a reflection surface body coordinate system SigmaA are defined; (2) with the reflection surface adopted as a datum, an ideal parabolic antenna system is established, so that the theoretical pointing of the deployable antenna system can be obtained; (3) the installation accuracy of thefeed source and the first-stage deployment arm is measured, and the actual pointing of the deployable antenna system is calculated through a transfer matrix method according to inherent error transferrelationships between various components of the deployable antenna system, inherent error being angular error which is brought by manufacturing tolerances after the deployment arms are deployed, andthe actual pointing of the deployable antenna system is determined; and (4) the actual pointing and theoretical pointing of the deployable antenna system are compared with each other, so that the pointing accuracy of the antenna system can be obtained.

Description

technical field [0001] The invention belongs to the field of satellite analysis and calculation, and relates to a pointing accuracy calculation method of a space-borne deployable antenna system. Background technique [0002] With the rapid development of aerospace technology, the demand for large-aperture, high-gain antenna systems is becoming more and more urgent. The space-borne deployable antenna system is folded into the satellite body during launch, which can not only adapt to the effective carrying space of the rocket, but also has the function of autonomous deployment in orbit, so it has been widely used in various satellites. The space-borne deployable antenna system usually works in a higher frequency band, so the structural index and electrical performance index of the system are required to be stable and reliable. Therefore, the on-orbit working accuracy of the spaceborne deployable antenna system has become a key concern, and its pointing accuracy and other perf...

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Problems solved by technology

[0003] The spaceborne deployable antenna is a rootless tree system that is sent into space to operate. Unlike other antennas, its reflective surface can be indirectly installed on the star through multiple links. After the antenna is installed on the star, it cannot be simulated or measured in the ground test. Therefore, a pointing accuracy calculation method for a spaceborne deployable antenna system is needed to realize the system accuracy estimation after the satellite is installed

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