基于正交匹配追踪的欠采样LFM信号参数估计

摘要

Restricted by the current A/D sampling, parameter estimation of sub-sampling wideband Linear Frequency Modulated (LFM) signal has important research value. Based on that the LFM signal has approximate rectangular spectrum, the differentiation spectrum is used to extract the edge of sub-sampling LFM spectrum by Orthogonal Matching Pursuit (OMP) in this paper. It can estimate the initial frequency and final frequency of sub-sampling wideband LFM signal and has higher estimation precision. The effectiveness of this method is confirmed with numerical simulation.%　　受限于目前数字采样水平，对宽带线性调频(LFM)信号进行欠采样参数估计具有重要的研究价值。该文基于线性调频信号具有近似矩形的幅频特性，对其频谱的差分过程进行处理，采用正交匹配追踪算法有效提取欠采样信号频谱的边缘信息，实现在欠采样环境下的宽带线性调频信号起始频率和终止频率的估计，具有较高的估计精度，仿真实验证明了其有效性。