一种限定虚警概率的PN码捕获自适应门限估计算法  

An Adaptive Threshold Estimation Algorithm for PN code Acquisition with Limitative False Alarm Rate

作　　者：张爱民[1] 韩方景[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《航空电子技术》2008年第4期11-14,22,共5页Avionics Technology

基　　金：航空科学基金资助项目(20060112005)

摘　　要：提出了一种限定虚警概率的PN码捕获的自适应门限估计算法,首先在对判决变量的统计特性分析的基础上,计算出了判决门限的有偏估计量;然后分析了估计偏差对捕获系统检测概率和虚警概率的影响;最后,计算机仿真表明,在限定虚警概率的前提下,捕获系统在高斯白噪声信道和瑞利衰落信道下具有较高的检测概率,自适应门限的估计方法易于实现,且适合工程应用。A new adaptive threshold estimation algorithm for PN code acquisition with limitative false alarm rate is proposed. On the basis of analyzing the statistical property of the decision variable, the biased estimation of decision threshold is computed; and then the biased estimation of threshold which has effect on false alarm probability and detection probability of acquisition system is analyzed. Finally, the computer simulation shows that the detection probability of acquisition system is higher over additive Gaussian white noise channels and Rayleigh fading channels under the condition of limitative false alarm rate. The proposed method for estimating adaptive threshold can be easily implemented and is very applicable to practical engineering.

关 键 词：数字匹配滤波 PN码捕获 检测概率 限定虚警概率 自适应门限估计 

分 类 号：TN914.4[电子电信—通信与信息系统]