Measurement method and system of rotation angle of satellite antenna about optical axis

Abstract

The invention discloses a measurement method of a rotation angle of a satellite antenna about an optical axis. Three feed source power sensors are arranged on a satellite, a ground leading beacon station is correspondingly arranged on the ground for three feed source optical axis centers; each antenna optical axis is fixedly pointed to the ground leading beacon station; the method is characterizedby comprising the following steps: setting one or more ground auxiliary beacon stations in an optical axis center beam ground coverage range, wherein a satellite feed source receives a ground beaconsignal, and the receiving signal power is the function of the distance between the feed source center and the beacon station; computing the rotation angle about the optical axis by measuring the signal power of the beacon station. An measurement system disclosed by the invention is mainly composed of the ground leading beacon station, the auxiliary beacon stations and three on-satellite feed source power sensors; the rotation about optical axis of the satellite antenna can be measured and the pointing of the multi-beam satellite antenna can be calibrated, and the computation burden can be greatly reduced when only one ground beacon station is existent.

Description

technical field [0001] The invention belongs to the technical field of satellite antennas, and relates to pointing measurement thereof, in particular to a method and system for measuring the rotation angle of a satellite antenna around a visual axis. Background technique [0002] Geostationary orbit (GEO) satellites usually work in low-inclination orbits, that is, the orbits of satellites around the earth are on the plane of the earth's equator and are in the same direction as the earth. The central boresight of the satellite multi-beam antenna can be kept fixed to the ground pointing point through the attitude bias control. When the satellite antenna rotates around the boresight, it will cause pointing deviation of other beams except the boresight, which will affect the use of satellite multi-beam resources. figure 1 The beam pointing of the satellite antenna rotated around the boresight is shown, with each beam pointing to a specific small area in the terrestrial cellular...

AI Technical Summary

Problems solved by technology

For multi-beam satellites, if only the ground beacon at the center of the boresight is used to measure the antenna pointing, even if it rotates around the boresight, the strength of the received ground beacon signal will not be changed, and the rotation angle around the boresight cannot be measured

If other beams other than the boresight are used to receive ground beacon signals to measure the angle of rotation around the boresight, since the beam centers of other beams other than the boresight move periodically in days, the beam pointing position will deviate far away, resulting in The beacon station is beyond the beam coverage, so it is difficult to establish continuous and effective communication with a ground beacon station

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