多径和互相关项对GNSS射频兼容性评估的影响  

The effect of multipath and cross-correlation items on GNSS radio frequency compatibility assessment

作　　者：陈冰雪[1,2] 岳岫峪 张振荣[1,2] 李唐超 覃团发[1,2] CHEN Bing-xue;YUE Xiu-yu;ZHANG Zhen-rong;LI Tang-chao;QIN Tuan-fa(School of Computer and Electronic Information,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Multimedia Communications and Network Technology,Nanning 530004,China)

机构地区：[1]广西大学计算机与电子信息学院,广西南宁530004 [2]广西多媒体通信与网络技术重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2018年第2期589-595,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(61563004;61004123;61661004)

摘　　要：L1频段上CDMA体制的全球四大卫星导航系统的频谱严重重叠,不可避免地带来干扰问题。等效载噪比及其衰减值(C/N0)eff、谱分离系数(SSC)是评估全球卫星导航系统间干扰程度的重要参数。传统评估模型中,为了简化分析过程和计算复杂性,在计算时忽略一些影响因素,如接收机输出端目标信号和干扰信号的多径效应和互相关性。为了进一步提高导航系统射频兼容性(RFC)评估的准确性,这些因素都应该进行考虑。本文将推导考虑多径效应和互相关项下的等效载噪比衰减值的计算表达式,并计算GPS C/A码在L1频带的系统间和系统内干扰,以说明互相关项和多径对GNSS之间的RFC评估的影响。The spectrum of four global satellite navigation systems allocated on the L1 band are severely overlapped,which makes signal interfere inevitably.The effective carrier power-to-noise density ratio(C/N 0)eff,the degradation of effective carrier power-to-noise density ratioΔ(C/N 0)eff and the spectral separation coefficient(SSC)are important criteria for evaluating the degree of interference among Global Navigation Satellite Systems(GNSS).In order to simplify the analysis process and computational complexity,traditional assessment models may ignore some impacted factors in the calculation,such as the multipath effect and the cross-correlation items between desired signal and interference signals outputted from the receiver.In order to further enhance the accuracy of radio frequency compatibility(RFC)assessment among multi-GNSS,those factors should be considered more.In this paper,the expression of equivalent carrier noise ratio attenuation value considering multipath effect and cross-correlation is derived.The interference of GPS C/A codes between inter-system and intra-system on L1 band is calculated to explain the effect of cross-correlation and multipath on RFC evaluation between GNSS.

关 键 词：射频兼容性 等效载噪比 谱分离系数 互相关性 RFC 

分 类 号：P228[天文地球—大地测量学与测量工程]