Research on Measurement Technique of Star Simulator
|School||Changchun University of Science and Technology|
|Course||Instrument Science and Technology|
|Keywords||star simulator angular distance between stars CCD magnitude|
The star simulator is one kind equipment of simulating starry sky in the ground and calibration the star sensor.This article is research about the measuring of angular distance between the star and the star magnitude.According to the star simulator’s major qualification,studied in the angular distance between star and the star magnitude, this article propsed the method of measuring the angular distance between the star with theodolite and CCD,as well as measure the star magnitude with CCD.We established the geometric model of measuring the angular distance between star with theodolite,and inferred the mathematical formula of using the theodolite to measure the angular distance between star,and theoretical analyzed the reasult of measuring the angular distance between star,the precision is 3.5";For certain dynamic and static star simulator,we used the theodolite to measure the angular distance between star,and according to the measurement reasult, we proposed one kind correction mathod of the star position error’s about the dynamic star simulator.We discussed the feasibility of using CCD to measure the angular distance between star and star magnitude,preliminary designed the CCD objective lens’ optical system,established the geometrc model of measuring the angular distance between star with CCD,inferred the mathematical formula of using CCD to measure the angular distance between star;Used the CCD segmentation technology,determined the mass center position of the star point,and theoretical analyzed the result,the precision is 14".Meanwhile used the grey level of the star’s mess center position in the CCD image,we obtained the star magnitude value.Used the Canon CCD camera to measure the angular distance between star of certain static star simulator,the measurement result indicated:the different is most greatly 13.7" between the CCD measurement value and the theodolite.