背景辐射功率对星载激光高度计信噪比的影响研究  

INFLUENCE OF BACKGROUND RADIANT POWER ON THE SIGNAL-TO-NOISE RATIO OF SPACE-BORNE LASER ALTIMETER

作　　者：黄庚华[1] 欧阳俊华[1] 舒嵘[1] 王建宇[1] 薛永祺[1] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083

出　　处：《红外与毫米波学报》2009年第1期58-61,71,共5页Journal of Infrared and Millimeter Waves

基　　金：上海市科技发展基金月球探测三维数据处理关键技术研究(045115018)

摘　　要："嫦娥一号"卫星的有效载荷激光高度计通过测量发射与接收信号之间的时间间隔,获得星—月距离数据.本文分析了背景辐射功率、倍增因子与激光高度计最佳信噪比之间的关系,并利用积分球进行了不同背景辐射功率下的信噪比试验,验证了背景辐射功率以及雪崩二极管倍增因子对接收系统信噪比的影响.结果表明,在不同的背景辐射功率条件下,存在不同的最佳倍增因子,使接收系统获得最大信噪比.The Chang＇ E lunar observation laser altimeter was designed to provide precise altimeter data to accurately map the lunar surface by measuring the time interval between the emission and receiving signal. The relationships of the background radiant power, the multiplication factor, and the optimum signal-to-noise ratio of the receiving system were analyzed. The signal-to-noise ratio experiment for different background radiant power was conducted by using the integrating sphere. The influences of background radiant power and APD mutipliction factor on the signal-to-noise ratio of the receiving system were validated. The integrating sphere＇ s simulation test shows that there are variant optimum multiplication factors to achieve the maximum signal-to-noise ratio under variant background radiant power conditions.

关 键 词：星载激光高度计 背景辐射功率 雪崩二极管 倍增因子 信噪比 

分 类 号：TN216[电子电信—物理电子学]