低信噪比下线性调频信号检测与参数估计

对低信噪比下线性调频信号的参数估计方法进行了分析 ,提出了首先由信号分段相关解线调的方法得到调频斜率的粗略估计 ,再以此估计值为初值 ,采用局部解线调的技术在一定范围内搜索计算 ,从而快速实现局部Radon Wigner变换检测 ,并给出了线性调频信号参数的极大似然估计。计算机模拟仿真证明了此方法的有效性。

Linear Frequency-Modulated Signal Detection and Parameter Estimation in Low Signal-to-Noise Ratio Condition

A method for linear frequency modulated (LFM) signal detection and parameter estimation is proposed. Based on the segmented correlation dechirp method, we get a rough estimation of the frequency rate. After that, we take it as an initial value of the direct dechirp method, and then search the accuracy value in a certain scope. Thus we can detect signal by local Radon Wigner transform and get the parameter maximum likelihood (ML) estimation quickly. The effectiveeness of this method has been shown by computer simulation.;