CN103185887B - 一种卫星导航系统的选星方法 - Google Patents

一种卫星导航系统的选星方法 Download PDF

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CN103185887B
CN103185887B CN201110444326.XA CN201110444326A CN103185887B CN 103185887 B CN103185887 B CN 103185887B CN 201110444326 A CN201110444326 A CN 201110444326A CN 103185887 B CN103185887 B CN 103185887B
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geo satellite
navigation system
selection method
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CN103185887A (zh
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李国贤
谭伟强
王菲
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Techtotop Microelectronics Co Ltd
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Abstract

一种卫星导航系统的选星方法,所述卫星导航系统包括GEO卫星和非GEO卫星,定位时,优先使用非GEO卫星进行定位处理。采用本发明的技术方案后,在接收机进行卫星选择时,可选择定位精度较高的非GEO卫星,从而提高接收机定位的精确度。

Description

一种卫星导航系统的选星方法
技术领域
本发明涉及一种北斗2代卫星导航系统的选星方法。
背景技术
北斗卫星导航系统是中国正在实施的自主发展、独立运行的全球卫星导航系统。其空间段包括地球5颗静止轨道卫星(GEO),和30颗非静止轨道卫星(MEO/IGSO)。地球静止轨道卫星(GEO)分别位于东经58.75度,80度,110.5度,140度和160度。非静止轨道卫星由27颗中圆轨道卫星(MEO)和3颗倾斜同步轨道卫星(IGSO)组成。
GEO卫星由于其运行的轨道高度(三万六千公里)要比MEO卫星的轨道高度(二万一千五百公里)要高,所以一般而言,GEO卫星达到接收机装置的信号强度会比非GEO卫星的信号强度要弱。而弱信号需要更长的积分时间来达到灵敏度的要求,因而增加了定位的时间。
表1:北斗导航电文速率
由表1可知:GEO卫星播发的导航电文速率为500b/s,而非GEO卫星的导航电文速率为50b/s。为了达到捕获的灵敏度要求,在所需的相同积分时间内,GEO卫星的数据变化情况要比非GEO卫星的情况要复杂,因而对GEO卫星的捕获处理需要花更多的时间。
还有,由于GEO卫星是地球静止轨道卫星,所以GEO卫星相对接收机的多普勒接近0,如果用其参与定位计算,接收机定速结果将会有较大误差,从而影响接收机的后处理。
北斗系统中的GEO卫星与非GEO卫星都可以用于定位解算,而在实际应用中必定有可能出现GEO卫星与非GEO卫星同时可见的情况。但GEO卫星与非GEO卫星的信号特性有所不同,接收机内部的处理也有所不同。如果不做任何判断就使用当前捕获到的卫星,必定会影响定位的精度。
发明内容
本发明的目的是,提供一种北斗2代卫星导航系统的选星方法,使接收机根据本方法选择卫星进行定位,从而提高定位精度。。
本发明提供一种卫星导航系统的选星方法,所述卫星导航系统包括GEO卫星和非GEO卫星,并优先使用非GEO卫星进行定位处理。
更进一步,在捕获和跟踪时优先处理所述非GEO卫星。
更进一步,解算时,所述非GEO卫星数目达到定位要求即进行后处理。
更进一步,所述卫星导航系统为北斗2代卫星导航系统。
本发明还提供一种应用上述选星方法的卫星导航接收机。
更进一步,所述卫星导航接收机,在捕获和跟踪时优先处理所述非GEO卫星。
更进一步,所述卫星导航接收机,解算时,所述非GEO卫星数目达到定位要求即进行后处理。
更进一步,所述卫星导航接收机是北斗2代卫星导航接收机。
采用本发明的技术方案后,在接收机进行卫星选择时,可选择定位精度较高的非GEO卫星,从而提高接收机定位的精确度。
附图说明
图1是本发明第一个具体实施例的示意图;
图2是本发明第二个具体实施例的示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
附图1给出了本发明第一个具体实施例。在本实施例中,接收机优先捕获非GEO卫星101,对非GEO卫星的捕获判断过程如下:将原始导航电文与本地伪随机码进行相关处理,通过确定的相关值从而获得北斗卫星信号,并通过该伪随机码判断是否为非GEO卫星。然后判断非GEO卫星数目是否达到定位要求的数目102:是,则进行后处理105,解算得到定位结果;否,则捕获GEO卫星103,其过程与非GEO卫星的捕获判断过程一致。判断非GEO卫星和GEO卫星数目之和是否达到定位要求数目104:是,则进行后处理105,解算得到定位结果;否,则继续捕获非GEO卫星101。
附图2给出了本发明第二个具体实施例。在本实施例中,接收机捕获当前天空的可见卫星201,然后判断捕获卫星中非GEO卫星数目是否达到定位要求的数目202:是,则进行后处理204,解算得到定位结果;否,则判断当前捕获的卫星中非GEO卫星和GEO卫星数目之和是否达到定位要求数目203:是,则进行后处理204,解算得到定位结果;否,则继续捕获可见卫星201。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。

Claims (2)

1.一种卫星导航系统的选星方法,所述卫星导航系统为北斗2代卫星导航系统,包括GEO卫星和非GEO卫星,所述GEO卫星播发的导航电文速率为500b/s,所述非GEO卫星的导航电文速率为50b/s,其特征在于,优先选取所述非GEO卫星进行捕获跟踪,解算时,如果所述非GEO卫星数目达到定位要求即进行后处理;当所述非GEO卫星数目不能满足定位要求时,捕获跟踪所述GEO卫星,解算时,如果所述非GEO卫星和GEO卫星数目之和达到定位要求即进行后处理。
2.一种应用如权利要求1所述方法的卫星导航接收机。
CN201110444326.XA 2011-12-27 2011-12-27 一种卫星导航系统的选星方法 Active CN103185887B (zh)

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CN103823224B (zh) * 2014-03-04 2016-04-06 南京航空航天大学 一种基于北斗卫星导航系统的分轨选星方法
CN106199654B (zh) * 2016-08-23 2019-03-29 东南大学 卫星接收机快速冷启动方法
CN110231637B (zh) * 2018-03-05 2021-04-13 中移物联网有限公司 一种卫星的选取方法、服务器和计算机存储介质

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Publication number Priority date Publication date Assignee Title
CN1155358A (zh) * 1994-06-22 1997-07-23 艾利森公司 使用同步和非同步卫星的无线通信系统
CN101604996A (zh) * 2009-05-08 2009-12-16 中国人民解放军空军工程大学 低轨道/中轨道双层卫星光网络结构系统及设计计算方法
CN101968544A (zh) * 2010-08-05 2011-02-09 东莞市泰斗微电子科技有限公司 一种用于gps和北斗2代双模式卫星导航接收机的快速冷启动方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1155358A (zh) * 1994-06-22 1997-07-23 艾利森公司 使用同步和非同步卫星的无线通信系统
CN101604996A (zh) * 2009-05-08 2009-12-16 中国人民解放军空军工程大学 低轨道/中轨道双层卫星光网络结构系统及设计计算方法
CN101968544A (zh) * 2010-08-05 2011-02-09 东莞市泰斗微电子科技有限公司 一种用于gps和北斗2代双模式卫星导航接收机的快速冷启动方法

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