数据通道对伪码跟踪环跟踪性能的影响  

Impact of data channel on tracking performance of pseudo-code tracking loop

作　　者：金小军[1] 张朝杰[1] 郁发新[1] 郑阳明[1] 金仲和[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第3期466-470,共5页Journal of Zhejiang University：Engineering Science

基　　金：教育部科学技术研究重点资助项目(104096);高等学校全国优秀博士学位论文作者专项资金资助项目(200035)

摘　　要：针对再生伪码测距应用中测距通道和数据(遥控或遥测)通道同时工作时的不同功率分配情况,分析了数据通道在PCM/PSK/PM和SP-L/PM两种调制方式下对伪码跟踪环跟踪精度的影响,同时还考虑了频率参考源不稳定引入的影响.理论分析和仿真结果表明,跟踪性能的下降取决于测距信噪比和信号干扰比,而信号干扰比又同数据速率与伪码速率之比有关,而且随着这个比值的增大呈现出极大值和极小值有规律的交替变化.通过合理选择数据速率,以及在正常的再生伪码测距信噪比条件下,跟踪性能损失很小,同时频率参考源不稳定的影响可以忽略.Considering different power divisions of the ranging channel and the data channel in regenerative pseudo-noise ranging applications, the impact of the data channel with two modulation modes of PCM/ PSK/PM and SP-L/PM on the tracking accuracy of pseudo-code tracking loop was investigated, and the effect of frequency reference instability was also discussed. Analysis and simulation show that the degradation of tracking performance depends on ranging SNR and signal-to-interference ratio （SIR）. SIR is further relative to the ratio of data rate to pseudo-code chip rate, and SIR changes with a law of maximum-minimum alternation as this rate ratio increases. With appropriate selection of the data rate and under normal SNR conditions, the degradation of tracking performance is quite small, and the effect of frequency reference instability can be ignored.

关 键 词：再生伪码测距 伪码跟踪环 跟踪性能 信号干扰比 

分 类 号：V566[航空宇航科学技术]