摘要
在GPS导航定位系统中,多普勒频率偏移直接影响接收机性能。为了克服多普勒频率偏移的影响,提高接收机的GPS信号捕获速度,对多普勒频移估计算法进行研究。通过分析可视卫星的判定、Doppler频移计算方法,基于NewStar 150GPS原理实验平台,使用C++语言编程,开发Doppler频移计算程序。实验结果表明,Doppler频移的大小与α有关。当α<90°时,多普勒频移为正,用户接收机收到的频率比卫星发射的频率要低。当α>90°时,多普勒频移为负;当α=90°时,多普勒频移为0。
In the satellite navigation and positioning that degrade the performance of satellite receiver. system , Doppler frequency shift is the key problems To overcome the influence of Doppler frequency shift and improve the speed of GPS signal acquisition , the paper first studies the algorithm of Doppler frequency shift estimation , and then deduces the mathematic models of satellite movement paremeters and Doppler frequency shift estimation. The paper has analyzed visible satellite＇s determination, the Doppler frequency deviation computational method, principle test platform based on the NewStar 150GPS, using the C＋＋ language programming, and has developed the Doppler frequency deviation computational procedure. The experimental result indicated that the Doppler frequency deviation＇s size and the angle concern. When a〈 90°, Doppler shift for positive, the user receiver receives the frequency must be lower than the satellite launch＇s frequency. When a〉90°, the Doppler shift was negative; when a=90°, the Doppler shift was zero.
出处
《测绘工程》
CSCD
2009年第3期6-8,12,共4页
Engineering of Surveying and Mapping
基金
国家重点基础研究发展规划(973)项目(2007CB209400)
教育部新世纪优秀人才支持计划资助项目(NECT-07-07098)
矿山空间信息技术国家测绘局重点实验室(河南理工大学
河南省测绘局)开放基金资助项目(KLM200816)
