星间激光通信中四象限探测器的定位精度研究  

Research on Positioning Accuracy of Four Quadrant Detector in Inter-satellite Laser Communication

作　　者：李树德 刘彩霞 徐林[2] 安建欣[2] 刘政 LI Shu-de;LIU Cai-xia;XU lin;AN Jian-xin;LIU Zheng(School of Electronic Information and Automation,Guilin University of Aerospace Technology,Guilin 541004,China;The 34th Research Institute of CETC,Guilin 541004,China)

机构地区：[1]桂林航天工业学院电子信息与自动化学院,广西桂林541004 [2]中国电子科技集团公司第三十四研究所,广西桂林541004

出　　处：《光通信研究》2021年第4期61-65,共5页Study on Optical Communications

基　　金：桂林航天工业学院2020年度校级基金资助项目(XJ20KT06);广西自然科学基金资助项目(2020JJA170017)。

摘　　要：在星间激光通信中,精跟踪单元常采用四象限探测器用于光斑位置定位,定位误差的大小直接影响精跟踪单元的测角精度。为实现微弧度量级的测角精度,文章研究了影响探测器定位误差的各个噪声因素,并根据星间光通信的实际情况进行了简化分析,提出了定位误差的具体计算方法,最后通过具体算例评估了各噪声因素的影响程度。研究结果表明,提高发射功率可以在一定范围内提高接收端信号的信噪比,减小定位误差,进而减小测角误差,提高测角精度。但定位误差并非随发射功率的增大而线性减小,当发射功率增大到一定程度之后,定位误差的减小有限,这时再单纯通过增大发射功率来提高测角精度代价将非常大。In inter-satellite laser communication,four-quadrant detector is often used in precise tracking unit for spot location.The positioning error directly affects the angular measurement accuracy of fine tracking unit.In order to achieve the tracking precision of micro-radian magnitude,this paper studies various noise factors that affect the positioning accuracy of the detector,simplifying the analysis according to the practice of inter-satellite laser communication,and putting forward the specific calculation method of positioning error.Finally,we evaluate the influence degree of each factor through a specific example.The results show that the signal-to-noise ratio of the received signal increases with the increasing of emitting power in a certain range with reduced positioning error.However,positioning error does not decrease linearly with the increase of transmitting power.When the transmitting power increases to a certain extent,the reduction of tracking error is limited.At this time,it will be very expensive to improve the tracking precision simply by increasing the transmitting power.

关 键 词：四象限光电探测器 定位误差 噪声因素 精跟踪单元 

分 类 号：TN256[电子电信—物理电子学]