高斯干扰下GNSS信号码跟踪精度分析  

Analysis of GNSS Signal Code Tracking Accuracy Under Gauss Interference

作　　者：叶旅洋 樊战友[1,2] 张瀚青 刘岩 武文俊[1,2] 胡永辉[1,2] YE Lv-yang;FAN Zhan-you;ZHANG Han-qing;LIU Yan;WU Wen-jun;HU Yong-hui(National Time Service Center,Chinese Academy of Science,Xi’an 710600,China;Key Laboratory of Precision Navigation Positioning and Timing Technology,CAS,Xi’an 710600,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院精密导航定位与定时技术重点实验室,西安710600 [3]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《计算机科学》2020年第1期245-251,共7页Computer Science

基　　金：国家自然科学基金项目(11703030,10773012);中国科学院西部青年学者项目(XAB2017A06);北斗军用定时终端检定规程(Y833ZX1601)~~

摘　　要：码跟踪精度是导航系统兼容互操作评估的重要参数。为定量分析高斯干扰下GNSS信号的码跟踪精度,从常见的高斯干扰信号出发,针对CELP,NELP及DP环路模型,基于MATLAB软件对GNSS信号的码跟踪精度进行仿真分析,并给出了NELP及DP环路的CT-SSC表达式,同时对环路模型的CT-SSC及Cramer-Rao下界进行分析。仿真结果表明:在相同条件下,GNSS信号的码跟踪误差受高斯窄带干扰及宽带干扰比较明显,而在一定信干比范围内,受高斯匹配谱干扰和带限白干扰比较稳定;在DP环路下,GNSS信号的CT-SSC三维曲面较CELP及NELP显得“平滑”,相应的跟踪性能也最好。对GNSS信号的码跟踪性能进行分析,有助于给GNSS系统的兼容与互操作评估及现代GNSS接收机的设计提供重要参考;给出的NELP及DP的码CT-SSC表达式,可作为与CELP的CT-SSC进行并行分析的参照依据。Code tracking accuracy is an important parameter for the compatibility interoperability evaluation of navigation systems.In order to quantitatively analyze the code tracking accuracy of GNSS signals under Gaussian interference,starting from common Gaussian interference signals,the code tracking accuracy of GNSS signals was simulated and analyzed according to the MATLAB software,the CT-SSC expression of NELP and DP loop were given,the CT-SSC and Cramer-Rao lower bounds of the loop model were analyzed meanwhile.The simulation results show that the code tracking error of GNSS signals is more obvious by Gaussian-narrowband interference and wideband interference under the same conditions,while code tracking error of GNSS signal is more stable under Gauss matching spectrum interference and band-limited white interference in a certain signal-to-interference ratio range.Under the model of DP,the three-dimensional surface of GNSS signal is more“smooth”than CELP and NELP model in terms of CT-SSC,and the tracking performance is best.The tracking performance analysis of GNSS signals can provide an important reference for GNSS system on compatibility and interoperability assessment as well as modern GNSS recei-ver design,and the expressions of CT-SSC about NELP and DP model can be analysis parallel with CELP model.

关 键 词：高斯干扰 GNSS 码跟踪 CT-SSC CRAMER-RAO界 

分 类 号：TN961[电子电信—信号与信息处理] P228[电子电信—信息与通信工程]