摘要
星间光通信系统的捕获、瞄准及跟踪(APT)过程构成了一个切换系统,通过电荷藕合器件(CCD)采集的光斑信息决定了切换的序列以及激活的子系统,对通信连续性有重要影响。分析了光通信中的捕获、瞄准及跟踪过程,建立了系统的切换模型;根据所得的系统模型验证了由于光斑噪声引起的系统切换对通信链路的影响;并提出了将均值滤波、最大类间方差法和连通区域选择法结合对光斑噪声信号进行抑制的算法。仿真结果表明CCD采集得到的灰度图像通过该算法处理后,能有效地消除椒盐噪声、高斯噪声以及恒星背景噪声的影响,确保星间光通信过程的连续性。
The inter-satellite laser communication system that implements for acquisition,pointing and tracking（APT） process,is a switch system which influences the continuity of communication widely.The switch sequence and the active subsystem are determined by the spot image collected by charge coupled device（CCD）.In this paper,the process of APT is analyzed in detail.Based on the whole workflow,the switch system model is represented.And the influence of spot noise which mixed into spot image to system performance is verified.The suppression algorithm that cascaded by average value wave filtering,Otsu method and selecting connected area method is proposed for the noise elimination.The simulation indicates that the algorithm is effective for pepper salt noise,Gaussian noise and stellar background noise,and the continuous communication can be got.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第3期743-747,共5页
Chinese Journal of Lasers
基金
黑龙江科技攻关计划(GZ06104A)资助课题
关键词
光通信
切换系统
抑制算法
光斑噪声
optical communications
switch system
suppression algorithm
spot noise
