利用帧头消除测距时标整周期滑动的方法  

The Elimination of Integer-period Ranging Timescale Slidingby Using Frame Headand Reducing Jitter Clock

作　　者：党群[1] 姚通[1] 张炳军 

机构地区：[1]西北工业大学365研究所,陕西西安710072 [2]中国石油技术开发公司,北京100009

出　　处：《信息安全与通信保密》2011年第3期47-48,51,共3页Information Security and Communications Privacy

基　　金：陕西省2010年度工业攻关项目资助(编号:2010K06-09)

摘　　要：在弹载扩频脉冲应答式测距系统中,应答机直接利用捕获脉冲作为时标信号进行测距。此法在高信噪比时测距精度较高,但在低信噪比时,伪码同步脉冲的抖动较大,同时捕获脉冲会产生整数个伪码周期地滑动,导致测距误差较大。为了提高测距精度,提出了一种利用帧头消除脉冲应答式测距时标整周期滑动并降低时钟抖动的方法。在获得伪码捕获脉冲并检测到帧头后,应答机才启动应答信号,可有效降低低信噪比时的测距误差。In missile-borne spread spectrum pulse transponder distance measurement system, transponder measures distance by using the acquisition pulse as timescale. It could achieve high accuracy of distance measurement at high SNR. But at low SNR, with the pseudo-code synchronous pulse jitters and the capture pulse produces an integer number of PN code cycle slide, the distance measurement would result in large ranging error. A method is proposed, thus to eliminate the integer- period ranging timescale sliding by using frame head and reducing clock jittering, and also the distance measurement error could be reduced effectively.

关 键 词：测距时标 整周期滑动 时钟抖动 

分 类 号：TN914.42[电子电信—通信与信息系统]