一种基于三正交主轴平面的快速星图模拟方法

为在地面上进行星图模拟以测试星图识别算法和星敏感器性能,提出了一种新的快速星图模拟方法.该方法利用截面圆和固定区域的性质,将单位天球按照三个正交主轴平面进行等分,根据赤纬值求解恒星矢量与主轴平面夹角来确定选星条件,进而根据坐标变换原理进行星图模拟.为验证所提方法与现有方法相比的优势,进行了大量的仿真实验.实验结果表明,与现有星图模拟方法相比,本文方法在保证星图模拟精度的条件下,选星速度提高了3倍以上.

A High-speed Simulation Method of Star Map Based on Three Orthogonal Axis Planes

In order to test the algorithms of star map identification and the performance of star sensor by simulating star map on the ground,a new and high-speed method for simulating star map is presented.This method makes use of the property of sectional circle and fixed field to divide the unit celestial according to three orthogonal axis planes and derive the angles between the vectors of stars and the axis planes based on latitude and longitude value as the condition for selecting stars. And then,star map can be simulated according to the principle of coordinate transformation.In order to verify the advantages of the proposed method compared with current methods,a lot of simulation is conducted.The simulation results show that compared with current common star map simulation methods,the proposed method guarantees the accuracy of choosing guide stars and its speed of choosing guide stars is three times faster than other methods.