潜望镜式卫星光通信终端的CCD粗跟踪

由于轻小型卫星光通信系统中潜望镜的光学结构随粗瞄机构姿态变化而发生改变,使得相应的跟踪算法变得较为复杂,本文对潜望镜式星间激光通信终端粗跟踪算法进行研究以提高粗瞄机构的跟踪精度.利用矩阵光学方法,建立了潜望镜式光通信终端中光学器件的矩阵模型,在获得CCD测角模型后,推导了基于CCD测角的粗瞄装置自动跟踪算法模型,实现了潜望镜式光通信终端粗瞄装置对目标光束的快速跟踪,并对模型进行了相应的实验验证.实验结果表明,该CCD测角跟踪模型正确地反应了实际终端中的光学传递关系,能够正确地对CCD图像位置信号进行处理并获得稳定跟踪角度,平均跟踪精度优于10 μrad,满足卫星激光通信中稳定可靠、高精度粗跟踪的要求.本文提出的方法对类似的光学系统具有借鉴意义.

Coarse tracking of periscope-type satellite optical communication terminals

Many small aperture satellite optical communication terminals utilize a periscope as the Coarse Pointing Appliance(CPA),however,the model of coarse tracking arithmetic becomes much complex since the optic structure of the periscope-type CPA varies with the angle of attitude in the CPA.To improve the tracking accuracy of the CPA,this paper researches coarse tracking arithmetic of periscope-type satellite optical communication terminals.Based on the optical matrix method,a matrix model with geometric optics for tracking in the periscope-type inter-satellite optical communication terminals was established.After obtaining the CCD-based angle measuring model,an automatic tracking model of the CPA was derived to implement the fast tracking for the target beams.A test was performed to testify the arithmetic.The test results prove that the tracking arithmetic can express the configuration of optical system exactly,and can process the information of locality from CCD accurately.The average tracking accuracy is less than 10 μrad.The test results also show that the tracking model can meet the requirements of the satellite optical communication.The method proposed in this paper would supply some helps for similar optical study.