Scaler and satellite pointing alignment determination method

Abstract

Disclosed is a scaler and satellite pointing alignment determination method. The invention provides a novel design idea: when an included angle between a satellite-center of earth line and a satellite-active scaler line, and view angle difference of a satellite are the minimum, an intersection of the beam center of a satellite antenna with the earth is closest to an active scaler. The specific steps include: 1, establishing an earth coordinate system, a geographic coordinate system and a carrier coordinate system; 2, acquiring satellite orbit predicted data and active scaler positional information; 3, calculating a vector of the satellite-scaler line and the included angle alpha of the earth's center-satellite line; 4, locating the satellite; 5, converting the vector to the carrier coordinate system; 6, calculating azimuth psi and pitch angle theta of a scaler antenna relative to the scaler (carrier coordinate system); 7, controlling the antenna to rotate according to the two angles through a servo control system so as to align the scaler with the satellite. According to the coordinate transformation theory, the method has no approximate error and high alignment precision.

Description

technical field [0001] The invention relates to a method for determining alignment between a calibrator and a satellite, and belongs to the technical field of space microwave remote sensing. Background technique [0002] The active calibrator of the spaceborne microwave scatterometer is an equipment for on-orbit testing and calibration of the spaceborne microwave scatterometer, which is of great significance to ensure the continuity of microwave scatterometer observation tasks and the consistency of data standards. Determining the alignment method of the calibrator and the satellite pointing directly affects the success or failure of the active calibrator to the satellite test, and is a key point of the active calibrator. This method has been tested in practical application, and the field test of active scaler was successfully completed in the first half of 2013. [0003] At present, there is no public report on the alignment method of foreign satellite-borne microwave scat...

AI Technical Summary

Problems solved by technology

[0005] (1) The distance from the satellite to the sub-satellite point changes with the movement of the satellite, and this method directly uses the satellite altitude to determine R, which will introduce errors;

[0006] (2) The position of the calibration device is placed at a certain distance from the horizontal plane. This method does not consider the influence of the height of the calibration device and introduces errors;

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