| 基于FFT的GPS快捕方法设计和实现 |
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| 引用本文： | 陈新, 杨军, 刘新宁,. 基于FFT的GPS快捕方法设计和实现[J]. 电子器件, 2008, 31(3): 938-940 |
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| 作者姓名： | 陈新 杨军 刘新宁 |
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| 作者单位： | 东南大学电子科学与技术工程学院,南京,210096;东南大学电子科学与技术工程学院,南京,210096;东南大学电子科学与技术工程学院,南京,210096 |
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| 摘 要： | 在GPS接收机中扩频信号的捕获是系统的关键技术之一.卫星和接收机的相对运动使GPS信号产生相位延迟和多普勒频移,传统的滑动相关的捕获方法需要很长的捕获实践.通过分析GPS的信号特征,推导出卫星信号和本地信号经过相关累加后成为以多普勒频率变化的正弦信号,证明了运用FFT方法可以快速估计出卫星信号的多普勒频率.同时详细介绍了基于此方法而设计的FPGA硬件方案,提出了一种分时复用的方法使12个通道共用一个FFT捕获硬件,提高了效率节省了面积.通过实验验证了改算法的有效性,缩短了捕获时间.
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| 关 键 词： | GPS 信号捕获 FFT FPGA |
| 文章编号： | 1005-9490(2008)03-0938-03 |
| 修稿时间： | 2007-10-15 |
Design and Implementation for Acquiring of GPS Signal Based on FFT Method |
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| CHEN Xin,YANG Jun,LIU Xin-ning. Design and Implementation for Acquiring of GPS Signal Based on FFT Method[J]. Journal of Electron Devices, 2008, 31(3): 938-940 |
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| Authors: | CHEN Xin YANG Jun LIU Xin-ning |
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| Affiliation: | CHEN Xin,YANG Jun,LIU Xin-ning(College of Electronic Sciecne , Technologices Engineering,Southeast University,Nanjing 210096,China) |
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| Abstract: | For the GPS receiver,acquiring the PRN signal is a crucial technology.The relative velocity between satellite and receiver will produce delay and Doppler frequency.It will take a long time to acquire the signal if adopting the traditional methods.The signal theoretical form is derived to demonstrate that the acquisition time can be reduced by using FFT method. An effective FPGA design which is able to reuse the FFT acquisition module is proposed.This design utilizes fewer resource by making 12 channels shar... |
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| Keywords: | GPS signal acquiring FFT FPGA |
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