摘要
为了精确实现对空间物体的测量,提出了利用线激光、单CCD相机、小孔成像与激光面约束模型的激光线测量法。引进三维信息已知的标准阶梯块作为激光面约束的标定块;由计算机控制摄像头对实物连续拍摄和实时处理,提取激光线上的像素坐标;利用建立的模型将二维坐标转换成三维坐标,再以点云的形式重构出物体,实现三维自动测量。实践中检测系统测量精度可达到0.05mm。
Based on the estimated channel state information, a new iterative maximum posterior probability （MAP） decoding algorithm of Turbo coded BPPM is proposed to improve the performance of atmospheric optical communication with long burst error by atmospheric scintillation. And the channel reliability factor and its estimation are presented. Finally, bit error rate of Turbo code with the proposed algorithm is presented and simulated. Compared with the traditional algorithm without estimation of channel state information, the proposed algorithm improves the error performance of Turbo code.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2006年第4期63-67,共5页
Opto-Electronic Engineering
关键词
大气光通信
TURBO码
MAP译码
可靠性因子
Atmospheric optical communication
Turbo code
MAP decoding
Channel reliability factor
