线性调频信号参数估计和仿真研究  

Estimation and Simulation Study of LFM Signal Parameters

作　　者：刘昊晨[1] 梁红[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《计算机仿真》2011年第2期157-159,263,共4页Computer Simulation

基　　金：国防科技预研基金项目资助(07J4.2.7)

摘　　要：研究信号处理精度问题,为提高线性调频(LFM)信号参数的估计精度,提出一种广义稳健中国剩余定理(GRCRT)和解线性调频的无模糊估计算法。利用两路欠采样LFM信号和相同时延信号共轭相乘后输出的单频特性,使用FFT和GRCRT估计LFM信号的调制斜率。根据调制斜率合成两路无载频LFM信号对两路欠采样LFM信号解线调处理,利用类似的方法实现LFM信号初始频率的无模糊估计。新方法由于GRCRT在重构被估计整数时精度高的特性和能够有效指导仿真参数的选取,克服了传统余数定理(CRT)估计精度低的缺陷。计算机仿真表明算法可保证信号的有效精度和稳健性。Based on GRCRT and direct dechirp operation,an algorithm to estimate parameters of LFM signals with under-sampling is proposed.Because of the under-sampling LFM signal and its two same time delay conjugation outputs are both single tones,the chirp rate is estimated unambiguously by FFT and GRCRT.Then using the estimated chirp rate,the dechirp operations are carried out by the produced LFM signals with no carrier chirp for two same time delay undersampling LFM signals,and the initial frequency can be estimated by the same method.The proposed method overcomes the drawback when using CRT.The computer simulation results prove the feasibility and robustness of the proposed algorithm.

关 键 词：欠采样 广义稳健中国剩余定理 线性调频信号 调制斜率 初始频率 

分 类 号：TN911.7[电子电信—通信与信息系统]