Satellite-borne terahertz detector antenna electric axis on-orbit calibration method and satellite-borne terahertz detector antenna electric axis on-orbit calibration system

Abstract

The invention discloses a satellite-borne terahertz detector antenna electric axis on-orbit calibration method and a satellite-borne terahertz detector antenna electric axis on-orbit calibration system. The on-orbit calibration method comprises the following steps: selecting a radio satellite, and setting a reference standard antenna electric axis; based on the selected radio star, determining anantenna on-orbit directional diagram and a relative relationship between frequency bands by receiving signals of the radio star, and calibrating an antenna electric axis of each frequency band; and according to the relative relationship between the antenna electrical axis of each frequency band and the reference antenna electrical axis, obtaining the relative relationship between the antenna electrical axes of each frequency band, and then outputting the relative calibration relationship between the antenna electrical axes of each frequency band. According to the invention, errors caused by atmospheric attenuation and interference can be avoided, and wide-spectrum and multi-band antenna electrical axes can be calibrated synchronously.

Description

technical field [0001] The invention relates to an on-orbit calibration method for an antenna electric axis of a spaceborne terahertz detector, and relates to a corresponding on-orbit calibration system, belonging to the technical field of satellite remote sensing. Background technique [0002] For microwave loads, the antenna pointing accuracy is an important factor affecting the application of microwave sounding data. It not only directly affects the accuracy of the geographical location of the observation target, but also has an important impact on the radiation calibration accuracy of the sounding data. In particular, with the improvement of application requirements and technical processes, large-aperture antennas have gradually changed from ground-based detection to space-borne detection. How to ensure the antenna pointing accuracy of large-aperture antennas in complex space environments is still a key problem to be solved. [0003] For spaceborne terahertz detectors, ...

AI Technical Summary

Problems solved by technology

The calibration process is mainly carried out in the ground-fixed coordinate system, and the atmospheric interference between the satellite terminal and the observation station during the propagation affects the calibration results. The shortcomings are: 1) The calibration results of the antenna pointing , its essence is not the calibration of the antenna itself, but a calibration of the deviation of the antenna itself coupled with various effects such as atmospheric interference and ground system errors; 2) the calibration results can only be limited to the distance between the ground fixed receiving station and the satellite The calibration of the antenna pointing between the antenna and the calibration result cannot be applied to the calibration between the antenna and other ground observation stations; it cannot be applied to the calibration of the antenna axis under other orientations.

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