Star Map Recognition Algorithm Based On The Star Sensor

In recent years, with the development of China’s space science, the aircraft attitudedetermination system in real-time, accuracy and reliability of the increasingly highdemand, while China’s current attitude determination system are more or lessdisadvantages, in real-time, most of the state output rate is low, the current our country isadvanced star sensor attitude control system attitude output rate is about1HZ in accuracy,which can provide the pointing precision basically maintained at10angle seconds;reliability, most of the current attitude based on star sensor to determine the system mostlywork in the celestial equator star more place, recognition in high Chiwei celestial less arearate decline very rapidly, and the number of star diagram of stars have certainrequirements, the algorithm also has many defects.This paper from the current actual situation of star sensor system, seek a kind ofsuper high real-time, accuracy and reliability of attitude determination system, which is ofgreat significance to improve the aircraft attitude determination. In real-time aspect, firstly,by improving the attitude determination system hardware conditions, in order to improvethe processing speed of the whole system, secondly by improving the recognitionalgorithm, to solve the star pattern recognition algorithm takes up a lot of time; in theaspect of precision, first using CCD high pixel position of star sensor based on, in order toimprove the determination of star on the map the location, followed by improving the starpattern recognition algorithm and the construction of navigation star database to improvethe recognition accuracy; in terms of reliability, mainly through the improvement ofalgorithm to solve the star pattern recognition algorithm can not solve the problem, inorder to improve the reliability of the whole system.In this paper, in combination with the actual situation to design a kind of softwareand hardware system core processor and CCD star sensor based on DSP, and a moreefficient circular compression algorithms of star map identification and navigation stardatabase construction method is proposed on the basis of the previous, this will improvethe real-time attitude output attitude control system to5HZ, the precision of the system upto3arc-second, improve the system of star map identification to99.999%.