基于FFT/iFFT的GPS信号捕获算法研究 |
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引用本文: | 任记达.基于FFT/iFFT的GPS信号捕获算法研究[J].现代导航,2013,4(6):407-410. |
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作者姓名: | 任记达 |
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作者单位: | 中国电子科技集团公司第二十研究所,西安710068 |
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摘 要: | 利用快速傅立叶变换和反变换(FFT/iFFT)在频域实现循环相关是一种GPS C/A码快速捕获的有效方法,其可以将时频二维的联合滑动相关搜索转化为一维频域搜索,实现了伪码的并行搜索,可以有效地缩短GPS信号的捕获时间。同时,针对弱信号捕获提出了相关和非相干累积的方法,并给出了试验结果。
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关 键 词: | GPS 伪码快速捕获 FFT iFFT 循环卷积 |
Research on Acquisition Algorithm of GPS Signal Based on FFT/iFFT |
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Authors: | REN Jida |
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Abstract: | Making use of FFT/iFFT to realize circular correlation in frequency domain is an effective method for GPS C/A code rapid acquisition. It can help translate 2D Time-frequency joint sliding correlation searching into 1D frequency domain searching, and realize parallel searching for pseudo-code, which can shorten the acquisition time of GPS signal. Meanwhile, the cumulative methods of coherent integration and non-coherent integration which according to the weak signal acquisition are presented, and the test results are given. |
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Keywords: | GPS C/A Code Rapid Acquisition FFT/iFFT Circular Convolution |
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