Method for determining wheel-track type reflector antenna pointing error

Abstract

The invention discloses a method for determining a wheel-track type reflector antenna pointing error. The problems that an existing analysis method cannot give complete consideration to factors of out-of-level tracks, non-plumb azimuth axes, non-vertical pitch axes, non-vertical pitch azimuth axes and non-vertical mechanical axes and pitch axes, and the relationship between a comprehensive axial system error and the antenna pointing error cannot be built are solved. The method includes the implementation steps that according to wheel-track type reflector antenna model parameters, a conversion matrix of a geodetic coordinate system to a reflector coordinate system under the ideal condition, namely the axial-system-error-free condition is built, and the pointing vector quantity under the ideal condition is obtained; then according to the axial system error distribution condition, a conversion matrix under the condition that the error exists is built, and the pointing vector quantity at the time is obtained; the azimuth and pitching pointing errors are accordingly obtained. According to the method, the influences of the comprehensive axial system error on the antenna pointing error are systematically considered, a foundation is laid to designing a follow-up high-pointing-accuracy antenna, and the development period is shortened.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a method for determining the pointing error of a wheel-rail reflector antenna, which is used to guide the design of a large-scale wheel-rail reflector antenna. Background technique [0002] In order to detect more and weaker celestial bodies, reflector antennas are required to have higher angular resolution and sensitivity, which makes antennas develop in the direction of high-frequency bands and large apertures. Many radio telescope antennas with apertures up to 100 meters have been established at home and abroad. Pointing accuracy is an extremely important performance index of a radio telescope, reflecting the ability of the antenna system to accurately point to the target azimuth. Its level not only affects the throughput of the telescope communication system, the system accuracy of laser ranging, and the operational efficiency of the tracking system, but also affects its ab...

AI Technical Summary

Problems solved by technology

Through the study of the above method, the disadvantages are summarized as follows: (1) Most of the literature considers the method based on experimental measurement to analyze the influence of shafting error on pointing error after the antenna is built. This method is only applicable to a specific antenna , is not general, and has no guiding significance for the design of other antennas; (2) Although some literatures have established the influence relationship between the shafting error and the pointing error, they have not considered the influence of the track irregularity

[0005] To sum up, there is currently no analysis method that considers the orbit error of the antenna and the comprehensive axis system errors such as the azimuth axis, pitch axis, and mechanical axis to study its impact on the antenna pointing error.

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