【摘要】 该文提出一种简单、实用的PN码捕获门限自适应设置方法 .我们在对判决量统计特性分析的基础上 ,采用最大似然估计准则估计出等效高斯白噪声方差V .由此 ,我们得到了判决门限值的自适应设置方法 .最后 ,我们进行了计算机仿真 .结果表明 ,通过估计门限构造出的PN码捕获装置检测性能与理论值非常吻合 ,从而说明了其有效性 .而且 ,判决门限的估计方法实现非常简单、快捷 ,很适合在工程中应用更多还原

【Abstract】 This paper proposes a simple and practical threshold adaptive estimating method for PN code acquisition.After analyzing the statistical property of the decision variable,we use the Maximum Likelihood (ML) criterion to adaptively estimate the variance of the Gaussian noise.Thus,we get the decision threshold.The performance of the acquisition method using estimated threshold got by computer simulation is very close to the theoretical one’s,which shows that the proposed method is useful.Furthermore,for the threshold’s estimation method is very simple and fast,it is very fit for practical application.更多还原