›› 2015, Vol. 35 ›› Issue (4): 10-16.doi: 10.3780/j.issn.1000-758X.2015.04.002

• 研究探讨 • 上一篇    下一篇

全球卫星导航系统兼容性评估方法研究

张建军1,2薛明1,2   

  1. (1中国空间技术研究院,北京100094) (2钱学森空间技术实验室,北京100094)
  • 收稿日期:2015-01-30 修回日期:2015-06-01 出版日期:2015-08-25 发布日期:2015-08-25
  • 作者简介:张建军 1979年生,2010年获中科院光电研究院计算机应用技术专业博士学位,高级工程师。研究方向为先进卫星导航系统兼容与互操作技术,基于认知技术先进空间信息系统。

ResearchonPerformanceAnalysisMethodofGlobalSatelliteNavigationSystemSignal

ZHANGJianjun 1,2 XUEMing 1,2   

  1. (1ChinaAcademyofSpaceTechnology,Beijing100094)
    (2QianXuesenLaboratoryofSpaceTechnology,Beijing100094)
  • Received:2015-01-30 Revised:2015-06-01 Online:2015-08-25 Published:2015-08-25

摘要: 目前,卫星导航系统兼容性评估方法主要是计算机仿真验证,难以复制真正的导航系统运行条件,改变任何一个参数都需要重新进行仿真,计算量和分析量很大,并存在较大误差。文章以卫星导航接收机为落脚点研究导航信号的兼容性。首先,根据干扰信号对全球导航卫星系统接收机捕获、载波跟踪、数据解调等的影响,推导了即时相关器输出的信号功率对噪声功率加干扰功率之比的模型,建立了基于频谱隔离系数的等效载噪比模型,利用相对较简单的等式就获得了干扰的一级评估;其次,具体分析了GPS C/A码自干扰时导航信号到达地面的功率、天线增益,以及星座功率增益等参数;最后,给出GPS C/A码自干扰时等效载噪比衰减的测试结果,在信号捕获时,多普勒频移为kHz的整数倍C/A码自干扰对所需GPS C/A码的等效载噪比衰减程度最大,达到9.6dBHz。该方法可以为中国新一代卫星导航系统信号设计提供参考。

关键词: 全球卫星导航系统, 兼容性, 相关器, 评估, 等效载噪比, 频谱隔离系数

Abstract: Sofar,computersimulationisthemainevaluationmethodforthecompatibilityperformanceofthesatellitenavigationsignals.Themodelingwasusedtosimulatethemeasuringconditionandstep,butitisimpossibletoreproducetheoperatingconditionoftherealnavigationsystem.Anyparameterchangewillleadtotheresimulation,averylargeamountofcomputationandanalysis,andlargeerrors.Basedonthesatellitenavigationreceiver,thecompatibilityofthenavigationsignalwasstudied.Firstly,themodelwasdeducedbytheratiooftheoutputsignalpowerofinstantcorrugatortothesumofthenoisepowerandtheinterferencepower,accordingtotheeffectoftheinterferencesignalonGNSSreceivercapture,carriertrackinganddataconditioning.Toobtaintheoptimalassessmentoftheinference,theequivalentcarriertonoiseratiomodelwasestablishedbyarelativelysimpleformula,basedonaspectralisolationfactor.Secondly,thepower,theantennagainandtheconstellationpowergainofthenavigationsignalswereanalyzedconcretelywhensignalarrivedatthegroundastheGPSC/Acodeself-disturbed.Finally,theattenuationtestingresultoftheequivalentcarriertonoiseratiowasshownwhentheGPSC/Acodeself-disturbed.Itprovidesreferenceforthesignaldesignofthenewsatellitenavigationsystem.

Key words: Globalsatellitenavigationsystem, Compatibility, Assessment, EquivalentCNR, Spectrumseparationcoefficient