时钟抖动对雷达信噪比和测量精度的影响  

Clock Jitter Effects on SNR and Measurement Accuracy of Radar

作　　者：王伟[1,2,3] 杜劲松 仝盼盼[1,2] 高洁 WANG Wei;DU Jin-song;TONG Pan-pan;GAO Jie(Shenyang Institute of Automation,Chinese Academy of Science,Shenyang 110179,China;Key Laboratory on Radar System Research and Application Technology of Liaoning Province,Shenyang 110179,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院沈阳自动化研究所,辽宁沈阳110179 [2]辽宁省雷达系统研究与应用技术重点实验室,辽宁沈阳110179 [3]中国科学院大学,北京100049

出　　处：《仪表技术与传感器》2018年第11期146-150,共5页Instrument Technique and Sensor

基　　金：国家重点研发计划项目(2016YFB0101101)

摘　　要：为了实现超宽带脉冲信号的高速率采样,雷达液位计采用等效时间采样方法有效降低对系统模数转换器的要求,时钟抖动是采样过程中影响信噪比和测量精度的主要因素之一。文中按照时钟抖动满足高斯随机过程模型,讨论时钟抖动对等效时间采样的脉冲信号的信噪比影响并给出了理论公式。仿真结果验证了计算公式的正确性,并给出了信噪比损失随各种因素变化的趋势以及信噪比损失对测距精度的影响。In order to complete the high rate sampling,radar level meter using the equivalent time sampling method can effectively reduce the system requirements of the analog to digital converter(ADC).Clock jitter is one of the most importation factors that affects the Signal-to-Noise Rate(SNR).This paper discusses the effect on the SNR of the pulse due to clock jitter and derives the theoretical formula based on Gauss random process model.The simulation results verify the formula and shows the change tendency of the SNR following various factors and the impact of the SNR loss which is caused by clock jitter on measurement accuracy.

关 键 词：雷达液位计 时钟抖动 等效时间采样 信噪比 

分 类 号：TN958[电子电信—信号与信息处理]