| GPS频域并行码捕获改进算法 |
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| 引用本文： | 赵丽,陈小惠,潘树国.GPS频域并行码捕获改进算法[J].电子测量与仪器学报,2011,25(11):985-990. |
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| 作者姓名： | 赵丽 陈小惠 潘树国 |
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| 作者单位： | 1. 南京邮电大学自动化学院,南京,210046
2. 东南大学仪器科学与工程学院,南京,210096 |
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| 摘 要： | 针对基于FPGA平台的GPS L1信号的软件接收机捕获实时性差的问题,设计并实现了改进的GPS信号频域并行码相位捕获算法.首先分析了频域并行码相位捕获的理论模型,在此基础上采用平均采样方法对5 714点的数据进行下采样,平均采样后为1 024点,用Altera FFT IP核实现1 024点数据的FFT计算,实现算法的...
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| 关 键 词： | GPS L1信号 捕获 平均采样 FFTIP核 C/A码 |
Improved Frequency Domain Parallel Code Acquisition Algorithm for GPS Signal |
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| Zhao Li,Chen Xiaohui,Pan Shuguo.Improved Frequency Domain Parallel Code Acquisition Algorithm for GPS Signal[J].Journal of Electronic Measurement and Instrument,2011,25(11):985-990. |
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| Authors: | Zhao Li Chen Xiaohui Pan Shuguo |
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| Affiliation: | 1.Nanjing University of Posts and Telecommunications,Nanjing 210046,China; 2.Southeast University,Nanjing 210096,China) |
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| Abstract: | This paper proposes an improved frequency domain parallel code acquisition algorithm for GPS L1 signal,which could overcome poor acquisition real-time of GPS software receiver based on FPGA.According to the frequency domain parallel code acquisition algorithm,the improved algorithm samples 5 714 points of data to 1 024 points during one period using average sampling technique.Subsequently,we utilize Altera FFT IP core to work out Fourier transform of 1024 points of data.Simulation experiment implemented to test the optimized algorithm by using ModelSim simulator.Simulation results indicate that the proposed approach could obviously reduce the calculating amount and largely increase acquisition speed.It doesn’t affect the final result of tracking process because only a little C/A code phase errors exist. |
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| Keywords: | GPS signal Acquisition Average sampling technique FFT IP core C/A code |
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