A method for calibrating and compensating fine code errors of coded sun sensors

Abstract

The invention discloses a method for calibrating and compensating the fine code error of an encoding type sun sensor. The method comprises the following steps: calculating optical diffraction error of the fine code of the encoding type sun sensor and building a uniform mathematical model of fine code compensation for the encoding type sun sensor; building an error calibrating system and obtaining data of calibrating points under all angles of the encoding type sun sensor; then respectively substituting the data of the calibrating points into the mathematical model to obtain a parameter value of the mathematical model, and encapsulating the mathematical model after the parameter is determined into an inner processor of the encoding type sun sensor; and outputting measuring angles after compensating the fine code error in time under any measuring angle by the encoding type sun sensor. By virtue of the method, the problem that the measurement error of the encoding type sun sensor regularly changes in a sine mode along with the angles can be solved; the constant error of the encoding type sun sensor system can be effectively improved; the encoding type sun sensor can be simply mounted; and the calibrating efficiency of the system is improved.

Description

technical field [0001] The invention relates to a method for calibrating and compensating a sun sensor, in particular to a method for calibrating and compensating a small code error of a coded sun sensor, and belongs to the field of calibrating the code error of a coded sun sensor. Background technique [0002] The sun sensor is an important measurement component of the satellite attitude control system, and it is also the earliest attitude sensor used for satellite attitude measurement. It is used to measure the incident angle of the sun relative to the sensor. [0003] The coded sun sensor uses a dedicated integrated silicon photocell as the core device, with a field of view greater than 120°×120° and a comprehensive measurement accuracy of better than 0.1° for the entire field of view. [0004] The optical assembly of the coded sun sensor is used as the angle measuring part. It is mainly composed of a piece of prism glass. Coding patterns with transparent and opaque inte...

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, a method for calibrating and compensating coded sun sensor fine code errors is proposed, which solves the sinusoidal regular change of the measurement error of the current sun sensor with the angle and the sun sensitive There is a problem of constant measurement error in the sun sensor, and the measurement accuracy of the sun sensor is improved by calibrating and compensating the small code error of the sun sensor

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