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中文摘要：
直接序列扩频信号（DSSS）具有抗干扰抗截获等特性，对其参数的有效估计具有重要意义。针对直扩信号的伪码周期估计的问题，在现有的自相关估计方法基础上引入二阶矩概念，提出了一种基于二阶矩的伪码周期估计算法，并对其进行了理论分析和实验仿真。仿真结果表明，该算法能适用于低信噪比情况，并且与自相关估计方法相比，估计性能更好。
英文摘要：
It isimportant to estimate the parameter of DSSS,which is jamproof and low probability of intercept.Aiming at the problem of paratemter estimation for the period of PN sequence,the second order moment based on autocorrelation methods are synthesized,a new method which can estimate period of PN sequence is proposed.The result of computer simulation show that these methods can work well on the lower S/N ratio input signals,and works well than autocorrelation method.
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