欢迎来到天天文库
浏览记录
ID:10874471
大小:1.35 MB
页数:8页
时间:2018-07-08
《基于矢量跟踪的sins_gps深组合导航方法》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第17卷第6期2009年12月中国惯性技术学报JournalofChineseInertialTechnologyVol.17No.6Dec.2009文章编号:1005-6734(2009)06-0710-08基于矢量跟踪的SINS/GPS深组合导航方法王新龙,于洁(北京航空航天大学宇航学院,北京100191)摘要:为了满足高动态用户及强噪声干扰条件下的应用需求,提出了一种基于矢量跟踪的SINS/GPS深组合导航方案。深组合方案利用组合卡尔曼滤波器反馈回路取代了传统接收机中独立、并行的跟踪环路,能够同时完成所有可视卫星信号跟踪和组合导
2、航信息处理的任务;利用相关器残差来更新导航参数状态,同时根据已有的导航参数和星历信息推测GPS伪码相位和多普勒频移等信号跟踪参数,用以控制接收机的本地伪码、载波数控振荡器(NCO),使本地伪码相位和载波频率与输入信号保持一致。最后,通过仿真验证表明,基于矢量跟踪的深组合方法不仅在GPS信号发生短暂中断期间,能够保证组合系统的导航精度和可靠性,而且在载噪比较低的环境中能够维持较好的伪码相位和载波频率跟踪性能。关键词:矢量跟踪;深组合;载噪比;伪码相位;载波频率中图分类号:U666.1文献标志码:ADeeplySINS/GPSintegr
3、atednavigationmethodbasedonvectortrackingWANGXin-long,YUJie(SchoolofAstronautics,BeijingUniversityofAeronauticsandAstronautics,Beijing100191,China)Abstract:TosatisfytheapplicationrequirementsofGPSreceiversunderhighvehicledynamicsaswellasseverenoisejammingconditions,adee
4、plyintegratednavigationschemeofStrapdownInertialNavigationSystem/GlobalPositioningSystem(SINS/GPS)basedonvectortrackingisproposed.ThedeepintegrationschemeutilizesthefeedbackloopofintegratedKalmanfiltertoreplacetheindependentandparalleltrackingloopsintraditionalreceivers
5、,whichenablesGPSreceiversaccomplishthetasksofavailableGPSsatellitesignalstrackingandintegratednavigationinformationprocessingsynchronously.Theoutputsofcorrelatorareusedtoupdatethenavigationparameters.Meanwhile,thesignalparameterssuchaspseudorandomnoise(PRN)codephaseandD
6、opplerfrequencyarederivedfromtheknownnavigationparametersandbroadcastephemeris,andusedtocontrolthelocalPRNcodeandcarriernumericallycontrolledoscillator(NCO).Consequently,thereferencedcodephaseandcarrierfrequencycouldkeepconsistentwiththecorrespondinginputtingGPSsignals.
7、Finally,thesimulationresultsindicatethatthisdeepintegrationschemecouldnotonlyguaranteethenavigationprecisionandreliabilityoftheintegratedsystemduringbriefsignaloutage,butalsomaintainperfecttrackingperformanceofcodeandcarrierfrequencyatlowcarrier-to-noisepowerdensityrati
8、o(C/N0)level.Keywords:vectortracking;deepintegration;carrier-to-noisepowerdensityratio;pseudorandomnoisecodeph
此文档下载收益归作者所有