| 一种用于卫星侦察的直扩信号参数估计方法 |
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| 引用本文： | 江莉,杨润玲,周军妮.一种用于卫星侦察的直扩信号参数估计方法[J].航天电子对抗,2008,24(6):17-20. |
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| 作者姓名： | 江莉 杨润玲 周军妮 |
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| 作者单位： | 西安建筑科技大学信息与控制工程学院,陕西西安,710055 |
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| 摘 要： | 针对卫星通信侦察过程中,信号参数未知的特点,提出了一种直接序列扩频(DS-SS)信号的参数估计算法.首先利用直扩信号中PN序列调制信息码的循环平稳特性,采用循环自相关函数对PN码周期进行估计,再利用相关特性估计出信息码与PN码的同步调制起始点,进行伪码序列的识别.计算机仿真实验验证了该方法的有效性,在极低信噪比条件下可以得到准确的伪码序列估计.
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| 关 键 词： | 直接序列扩频信号 伪随机序列 伪码周期 |
Parameter estimation of DS-SS signal for satellite reconnaissance |
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| Jiang Li,Yang Runling,Zhou Junni.Parameter estimation of DS-SS signal for satellite reconnaissance[J].Aerospace Electronic Warfare,2008,24(6):17-20. |
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| Authors: | Jiang Li Yang Runling Zhou Junni |
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| Institution: | Jiang Li,Yang Runling,Zhou Junni(School of Information , Control Engineering,Xi\'an University of Arch-itecture , Technology,Xi\'an 710055,Shanxi,China) |
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| Abstract: | An algorithm for fast blind estimation of direct-sequence spread-spectrum(DS-SS) signal is proposed,focusing on the(DS-SS) signals with parameters unknown under non-cooperative conditions such as satellite countermeasure and reconnaissance.Firstly,considering the characteristic that pseudo-random noise(PN) sequence modulates the information symbol,a method based on the second-order cyclic-cumulant is used to estimate the period of PN sequence.Then the method of segmented cross-correlation is used to identif... |
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| Keywords: | DS-SS signal PN sequence sequence period |
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