基于FPGA的GPS信号频域捕获算法设计及其实现  

Design and implementation for GPS signal acquisition in frequency domain based on FPGA

作　　者：陈雷[1] 孟维晓[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150001

出　　处：《应用科技》2011年第5期22-26,共5页Applied Science and Technology

基　　金：国家863基金资助项目(2007AA12Z338);国家自然科学基金资助项目(60772010)

摘　　要：GPS信号捕获是GPS接收机的关键技术,针对常用的GPS接收机中采用的串行滑动相关捕获技术速度慢的缺点,设计了基于FPGA的频域快速捕获算法.与传统的时域相关捕获算法相比,采用FFT技术的频域捕获算法可以快速捕获到多普勒频移及C/A码相位延时.同时使用了系统级建模工具System Generator设计快速捕获算法的FPGA硬件方案,并采用时分复用的方式使每次相关运算共用一个FFT核,节省了大量的硬件资源.For the GPS receiver,capturing the GPS signal is one of the key technologies.The conventional GPS receiver employs serial sliding capturing technology which is slow in speed,and therefore,a rapid acquisition method in frequency domain based on FPGA is designed.Compared with the traditional correlation acquisition algorithm in time domain,a signal acquisition approach processing in frequency domain which is based on FFT can fast capture the Doppler frequency shift and the phase delay of C/A code.And at the same time,the system-level modeling instrument—System Generator is used to design the FPGA hardware scheme for implementation of the rapid acquisition algorithm.As applying time division multiplexing technology,only one FFT core is used during each correlation operation,which therefore saves much hardware resources.

关 键 词：GPS 多普勒频移 FFT 频域捕获 System GENERATOR 

分 类 号：TN96[电子电信—信号与信息处理]