gps卫星接收机载波跟踪技术研究与实现-信号与信息处理专业毕业论文.docx

摘要
定的理论及实用价值。关键词:GPS,载波跟踪,开环/闭环,低信噪比
II
ABSTRA(了r
ABSTRACT
GPS statelite navigation-orientation system is a real,all-weather,globe,real time, high—definition navigation system based Call provide precise three-dimensional position,vdocity and satellite navigation system provides high precise time information and navigation service in military and became all important part of
ocean Or and Cal"navigation for civil.
The present papers focus on GPS carrier synchronization,which put a great effect on system performance,especially under the condition of low signal noise ratio and great doppler frequency the paper related methods to carrier synchronization in GPS system is summarized with a systematic view and analyzed to give out a design
guide.
There ar e plenty of researches on low dynamic target track for traditional DS receiver always uses a delay locked loop(DLL)to synchronize the PN code and then USeS a Costas loop to realize the carrier closed—loop structure not only takes long time to realize the synchronization but also has the defect of”hang up”.This paper took a tracking structure which PLL is(Phase locked loop)assisted with
FLL(frequency locked loop)and also dealt with false simulation gave a good
performance.
In recent years,with the development of the DS—SS and the theory of all digital receivers,the open—loop structure based forward estimation attracts more new synthetic frequency estimation algorithm of single—tone is is derived from the interpolated FFT with window bination with correlation result of simulation proves that it can replace the Costas—loop in the traditional DS receiver to realize the carrier synchronization.
The research results of the satellite signal receiver’S carrier-track techniques in this
paper Can be applied in the signal processing techniques of the modern satellite navigation munication systems,which are of great