一种快速的GPS软件接收机信号捕获方案设计  

A Scheme Design for Fast Signal Acquisition in GPS Software Receiver

作　　者：王献中[1] 杨静[1,2] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191 [2]北京航空航天大学控制一体化技术国家级重点实验室,北京100191

出　　处：《系统仿真学报》2010年第A01期25-29,共5页Journal of System Simulation

摘　　要：为了提高GPS软件接收机信号捕获的速度,设计了一种快速的GPS信号捕获方案。对比分析了两种常用的GPS(GlobalPositionSystem)信号粗捕获实现方法,设计了一种优化的实现方法;同时对常用的两种精细载波频率算法进行了比较分析,设计了一种二次曲线拟合的方法计算精细载波频率;基于多普勒频移的分布特点,改变以往顺序搜索的方式,采用跳频搜索的方法。最后,将优化的粗捕获方法、精细载波频率算法和多普勒频移跳频搜索方式组合成一个完整的GPS捕获方案,仿真结果表明所设计的实现方案运算量小、速度快,捕获的结果满足跟踪要求。In order to quicken signal acquisition in GPS software receiver, a fast acquisition scheme is designed here. Two common methods of GPS signal coarse acquisition are analyzed and compared, and an optimized method is adopted. Two common algorithms of calculating fine frequency are analyzed and compared and the conics fitting is designed to calculate the fine frequency. Based on the distributing character of Doppler frequency shift, swing frequency style of Doppler frequency shift search is employed. At last, a whole acquisition scheme are combined from optimized coarse acquisition、fine frequency algorithms and swing frequency style of Doppler search. Simulation results show that the designed scheme is of the advantage of less calculation、shorter acquisition time and the acquisition results can satisfy tracking needs.

关 键 词：GPS 方案设计 粗捕获 精细捕获 多普勒频移 

分 类 号：TN228.4[电子电信—物理电子学]