| 基于FFT的GPS快速并行捕获算法 |
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| 引用本文： | 陈希,张锐,帅涛.基于FFT的GPS快速并行捕获算法[J].宇航学报,2011,32(1). |
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| 作者姓名： | 陈希 张锐 帅涛 |
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| 作者单位： | 1. 中国科学院上海微系统与信息技术研究所,上海,200050;上海微小卫星工程中心,上海,200050
2. 上海微小卫星工程中心,上海,200050 |
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| 摘 要： | 为了提高GPS接收机的捕获速度和捕获精度,提出了一种新的基于FFT的并行捕获方案.采用一次FFT运算和多次IFFT运算同时完成频域和码相位域的二维搜索,将运算量减少一半.在通过判决捕获到相关峰后,通过简单内插精确确定载波频率,提高频率的分辨率.
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| 关 键 词： | GPS接收机 快速捕获 多项式内插 |
A New Rapid Acquisition Algorithm Based on FFT for GPS Signals |
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| CHEN Xi,ZHANG Rui,SHUAI Tao.A New Rapid Acquisition Algorithm Based on FFT for GPS Signals[J].Journal of Astronautics,2011,32(1). |
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| Authors: | CHEN Xi ZHANG Rui SHUAI Tao |
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| Institution: | CHEN Xi1,2,ZHANG Rui2,SHUAI Tao2(1.Shanghai Institude of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China,2.Shanghai Engineering Center for Microsatenites,China) |
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| Abstract: | To improve speed and accuracy of the GPS signal acquisition,a new parallel acquisition algorithm based on FFT is proposed.The new algorithm only takes one time of FFT and multiple times of IFFT to complete the two-dimensional search,and operation time reduces the half as compared with that of the traditional algorithm based on FFT.A new algorithm based on polynomial interpolation is proposed to improve the precision of the acquisition accuracy after the coarse acquisition.Simulation results prove it well. |
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| Keywords: | GPS receiver Fast acquisition Polynomial interpolation |
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