| 一种改进的高动态扩频信号捕获方法 |
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| 引用本文： | 黄健,张德海,孟进,闫大帅.一种改进的高动态扩频信号捕获方法[J].电子测量技术,2015,38(9):116-120. |
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| 作者姓名： | 黄健 张德海 孟进 闫大帅 |
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| 作者单位： | 1.中国科学院空间科学与应用研究中心北京100190;2.中国科学院大学北京100190,中国科学院空间科学与应用研究中心北京100190,1.中国科学院空间科学与应用研究中心北京100190;2.中国科学院大学北京100190,1.中国科学院空间科学与应用研究中心北京100190;2.中国科学院大学北京100190 |
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| 摘 要： | 针对传统方法对高动态大多普勒信号捕获存在的困难，本文提出的基于FFT的捕获方法，充分考虑了高动态性的影响，改进了接收信号模型，引入了多普勒频率变化率。算法将传统的二维搜索化为了先捕获多普勒频偏及频率变化率，再捕获伪码延时的二步搜索。频偏估计方面分析了匹配傅里叶变换法和延时自相关FFT估计法，码相位估计方面分析了伪码循环相关捕获法，并对两个阶段各个方案的复杂度、抗噪声性能进行了分析和改进，降低了算法复杂度、提高了抗噪声性能，最后用MATLAB仿真验证了方法的正确性和有效性。
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| 关 键 词： | FFT 高动态 多普勒频偏 伪码捕获 |
Improved acquisition method of the high dynamic spread spectrum signals |
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| Huang Jian,Zhang Dehai,Meng Jin and Yan Dashuai.Improved acquisition method of the high dynamic spread spectrum signals[J].Electronic Measurement Technology,2015,38(9):116-120. |
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| Authors: | Huang Jian Zhang Dehai Meng Jin and Yan Dashuai |
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| Affiliation: | 1.Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
2.University of Chinese Academy of Sciences, Beijing 100190, China,Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China,1.Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
2.University of Chinese Academy of Sciences, Beijing 100190, China and 1.Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
2.University of Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Traditional PN code acquisition algorithm is effectless for high dynamic Doppler shift signals.This paper presents acquisition methods based on FFT . It considers Doppler frequency change rate in high dynamic environment and improves the model of the received signal. It divides traditional two dimensional search algorithm into the separate estimation of Doppler frequency offset and frequency change rate as well as pseudo code phase. The complexity and signal to noise ratio of Doppler frequency shift estimation method, Matching Fourier Transform and Delay Self correlation, and code phase circular correlation estimation method are analysed and improved. The simulation by using MATLAB verifies that the algorithm is correct and effective. |
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| Keywords: | FFT high dynamic Doppler frequency shift PN code acquisition |
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