Design method for installation and pointing of three-field-of-view star sensor for sun-synchronous orbit satellites

Abstract

The invention discloses a designing method for installation orientation of a three-field star sensor on a sun-synchronous orbital satellite. According to the method, vector relation between stray light and a coordinate system of a satellite body is analyzed on the basis of a vector model for stray light and the coordinate system of a satellite body during in-orbit operation of the satellite, and areas free of influence by stray light are resolved by establishing a stray light boundary curve mathematical equation; on the basis of included angle relation of boundary curves, the method determines workable conditions of three star sensors and the scope and equation of installation orientation and calculates relation between a maximum sunlight shielding angle and a maximum earth-atmosphere radiation shielding angle of the light shields of the star sensor for suppressing stray light; and the method brings forward optimal schemes for installation orientation of star sensors to allow at least two star sensors to be in operation under a single condition when installation conditions for double star sensors are not met in areas free of influence by stray light under a variety of working conditions. The method has the advantage that a design scheme of practical application value is provided for installation orientation and designing of star sensors to prevent influence of stray light.

Description

technical field [0001] The invention relates to the field of spacecraft attitude measurement, in particular to a design method for installing and pointing a three-field-of-view star sensor of a sun-synchronous orbit satellite. Background technique [0002] As a spacecraft attitude measurement device, star sensors use stars as attitude measurement references. Compared with other satellite attitude sensors (sun sensors, gyroscopes, magnetometers, etc.), they have high precision, no drift, low power consumption, and The advantage of outputting absolute attitude information is that it is currently the most widely used attitude sensor. During the operation of the satellite, the star sensor may be interfered by sunlight or atmospheric light, which will increase the background noise of the image plane of the star sensor, affect the accuracy of star point extraction, and even the star point will be submerged in the background stray light , causing the star sensor not to work proper...

AI Technical Summary

Problems solved by technology

[0004] In terms of research on star sensor installation and pointing methods, many research institutions have proposed design methods for practical applications. Among them, in view of the satellite's various working conditions and attitude conditions, Aerospace Dongfanghong proposed a star sensor installation angle based on mission planning in 2010 The determination method can solve the installation and pointing problem of a given star sensor under agile maneuvering conditions, but this method determines the appropriate installation angle of the star sensor by continuously adjusting the installation angle of the star sensor and the working conditions, and the design method is very complicated. Cannot give the maximum sunlight and earth-atmospheric light shielding angle of the star sensor hood under different installation pointing conditions

Images