一种有效估计着陆引导信号多径时延的方法  

Efficient Time Delay Estimation Algorithm for Multipath Signal of Landing System

作　　者：李睿[1] 田孝华[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077

出　　处：《系统仿真学报》2011年第7期1441-1445,共5页Journal of System Simulation

基　　金：陕西省自然科学基金(SJ08F06)

摘　　要：利用导航信号收发已知且具有周期性的特点,提出了一种对着陆引导信号多径时延进行有效估计的方法。该方法首先计算相关函数,而后对相关函数进行二次微分,对时延值进行初步估计。最后通过直线拟合算法和比例拟合算法提高估计精度。通过计算机仿真,验证了算法的有效性。该算法具有在低采样率的条件下,估计精度高的特点。Based of known waveform and period of navigation signal,an efficient time delay estimation algorithm for multipath signal of landing system was proposed.Firstly,the correlated function was calculated.Then the second derivative of correlated function was computed in order to estimate the time delay initially.Finally,performance of estimation was improved by straight line fitting and proportion fitting.Its effectiveness was verified by the simulation results.The method has little error of time delay estimation in case of low sample rate.

关 键 词：导航信号 时延 相关函数 直线拟合 比例拟合 

分 类 号：TN953[电子电信—信号与信息处理]