根据小波分析理论，针对无源北斗导航定位系统初始校频问题，提出了一种基于小波分析的信号特征提取算法。

According to wavelet analysis theory, a signal picking up algorithm based on wavelet analysis is proposed to solve problem of passive CNS initial frequency calibration.

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本论文分析了基于北斗导航定位系统的三星定位系统总体结构和工作原理，对卫星导航中与定位精度有关的部分进行了研究。

This thesis analyzes the principle and architecture of three-star navigation system based on "Beidou" system and investigates the problems related with positioning precision.

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本文在对现有的GPS差分技术进行分析的基础之上，提出了一种适合北斗导航定位系统的差分定位技术，以提高其定位精度。

This article analyses current GPS difference technology and puts forward a difference position technology which can apply in BEIDOU system for improving the position precision.

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