正弦调制型微波测距系统的不确定度分析  

Uncertainty analysis for sinusoidal modulation microwave ranging system

作　　者：李存龙[1] 陈伟民[1] 章鹏[1] 严蓉[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044

出　　处：《仪器仪表学报》2014年第1期23-29,共7页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51078369)资助项目

摘　　要：设计搭建微波测距系统的首要任务是根据测距设计要求在各组成部件中完成合理的精度分配;按照测距信号在测距系统中的传播过程,将微波测距系统划分为5个环节,依次分析了各个环节的噪声对信号不确定度的影响,得到了整体系统总不确定度与子环节不确定度之间的理论公式;根据各子环节不确定度对系统总不确定度的影响程度分析,提出了总不确定等权分配的理论原则;搭建了微波实验系统,对各子环节不确定度及整体系统总不确定度进行了测量,得出发射、接收环节的不确定度在实际系统中占主要地位,从而提出降低对其他环节不确定度要求的非等权分配原则;对于实际应用的测距系统,需要根据实际场合的设计要求,也需要考虑不确定度与成本的平衡对精密度进行合理分配。The uncertainty allocation of microwave ranging system is the foremost task of the system design, which gives out the uncertainty of each component according to the total uncertainty of the system. The system is divided in- to five parts in accordance with the signal propagation process in the ranging system. The influence of the noise of each component on the signal uncertainty is analyzed. The formula between the total uncertainty of the whole system and the uncertainties of the sub-components is obtained, which implies the equally weighted uncertainty allocation theoretically. A microwave experiment system was built to measurement the uncertainties of the sub-components and the total uncertainty of the whole system. The experiment results indicate that the uncertainties of the transmitter ＆ receiver parts are the major components in the uncertainty of the actual system, from which the criterion of unequal weighted uncertainty allocation is proposed, and the uncertainty requirement of the other parts is reduced. For the ac- tual applicable ranging system, the reasonable uncertainty allocation should be under the consideration of balancing the uncertainty and cost of the components as well as the actual design requirement.

关 键 词：微波测距 相位测量 不确定度 分配原则 

分 类 号：TN953.2[电子电信—信号与信息处理] TM930.115[电子电信—信息与通信工程]