卫星激光测距系统中激光指向偏差测量的图像处理方法研究

Research on image processing methods for measuring laser pointing deviation in satellite laser ranging system

卫星激光测距系统中激光指向子系统与卫星观测子系统同步运行,从而保证激光束与卫星在同一视场,但不能保证激光束精确指向卫星.针对这一问题,需要使用图像处理技术,计算出激光束的光尖与卫星参考位置的偏差,从而调节激光束的发射角,使激光精确指向卫星.通过采用圆形平均滤波法进行图像预处理,提出矢量边界扫描法,在检测出激光图像边缘信息后,利用直线拟合获得了激光束的射入方向,最后计算出偏差.该方法应用于实际系统取得了较好的效果.

Laser pointing subsystem and satellite observing subsystem are synchronous in satellite laser ranging system to make sure that laser beam is in the same field of view with the satellite.While the system can not guarantee that the laser beam points to the satellite accurately.To solve this problem,image processing techniques are required to calculate the deviation between the tip of laser beam and the reference position of satellite,by which the emission angle of the laser beam can be adjusted automatically to point to the satellite accurately.Circular average filter method is adopted for image pre-processing and a vector boundary-scan method is proposed for detecting the edge information of laser images.After the incident direction of laser beam is obtained by straight line fitting,the deviation can be calculated out.Better results have been achieved by the method in actual systems.