Precision compensation method for area APS (active pixel sensor) digital sun sensor

Abstract

The invention which discloses a precision compensation method for an area APS digital sun sensor belongs to the spacecraft attitude control measure system field. The precision compensation method comprises the small-angle incidence angle precision compensation and the wide-angle incidence angle precision compensation. The precision compensation method comprises the following steps: 1, carrying out primary rotation correction on the solar faculae center coordinate value which is obtained through the calculation of a sun sensor image processing chip and is input by the sun sensor image processing chip; 2, carrying out secondary correction on the coordinate value of the wide-angle incidence angle, and utilizing the rotarily-corrected coordinate value to do the coordinate mapping of a refraction model; 3, calculating through an uniaxial higher-order polynomial fitting process to obtain the solar angle tangent value, utilizing the rotarily-corrected coordinate value to calculate if the incidence angle is a small angle, and utilizing the secondarily-corrected coordinate value to calculate if the incidence angle is a large angle; and 4, finding the arc tangent to obtain the sun angle value. The precision compensation method which is suitable for the precision compensation of the area APS array digital large-field sun sensor has the advantages of major error factor compensation and high precision.

Description

technical field [0001] The invention relates to attitude sensor technology in a spacecraft attitude control measurement system, in particular to an accuracy compensation method for an area array APS digital sun sensor. Background technique [0002] The sun sensor uses sunlight as a reference to calculate the angle between the sun and a certain axis of the satellite, and then determine the attitude of the satellite, which is a kind of satellite attitude control sensor. The sun sensor has 0-1 type sun sensor, analog sun sensor and digital sun sensor, and the digital type is divided into CCD (electromagnetic coupling device) digital sun sensor and APS (active pixel detector) according to the device. Digital solar sensors can be divided into linear array and area array according to device dimensions. At present, the latest product is the APS digital sun sensor of the area array, which can measure the two-axis sun angle, and has the characteristics of high precision, large field...

AI Technical Summary

Problems solved by technology

In addition, the APS digital solar sensor relies on calibration and fitting to achieve high-precision requirements, but during calibration and installation, errors such as rotation and deflection of the image detector and the optical axis of the solar simulator will inevitably occur, resulting in accuracy errors

[0004] Chinese patent number: 200610103797.3, name: high-precision APS digital sun sensor, this patent proposes a development method of APS digital sun sensor, which involves the calculation of attitude angle, and compensates for the modeling of calibration installation error and processing error , its shortcoming is that this method fails to correct and compensate the errors caused by refraction well, and for the area array APS digital sun sensor, it cannot meet the high precision requirements

[0005] Chinese patent number: 200810057353.X, name: Information processing method of APS sun sensor, this patent describes the information processing flow and method of digital sun sensor, and involves a large-angle attitude angle compensation method, using angle segmented linear interpolation Compensation is done by the method, and the error caused by refraction cannot be well corrected, nor can it meet the high precision requirements.

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