基于线性预测的多普勒频率估计方法研究  

Research on a Doppler Frequency Estimation Method Based on Linear Forecast

作　　者：刘志华[1] 党宏杰[1] 陶业荣[1] 杨潇[2] 

机构地区：[1]中国人民解放军63880部队 [2]中国人民解放军63921部队

出　　处：《无线电工程》2010年第10期20-23,共4页Radio Engineering

摘　　要：PCM/FM是遥测系统中广泛采用的一种编码调制方式。分析了基于DSTFT解调PCM/FM信号时采用逐频点搜索修正多普勒频率的方法存在的不足,提出了基于线性预测的多普勒频率估计方法,该方法通过对单一码元内的数据进行线性预测,扩展了有效数据的长度,在降低运算量的同时提高了频率分辨率。理论分析与仿真结果表明,这种方法能够利用较短的数据完成较高精度的多普勒频率估计。PCM/FM is a coded modulated mode applied abroad in TTC system.Analyzed the shortage of the method of searching frequency point by point and modifying the Doppler frequency as demodulated the PCM/FM signal based on DSTFT,proposed a new method of Doppler frequency estimation based on linear forecast,this method enlarged length of available data and advanced frequency resolution by forecasting the data in one code.The theoretic analysis and simulation＇s result indicated that the new method could achieve higher precision of Doppler frequency estimation with less data.

关 键 词：PCM/FM DSTFT 线性预测 频率估计 

分 类 号：TN91[电子电信—通信与信息系统]