一种基于抛物线预测去卷叠的LFM参数估计方法

Parameter Estimation Algorithm of LFM Signal Based on Parabola Prediction Unwrapping

针对受噪声污染的线性调频(LFM)信号参数估计中提取瞬时相位会发生卷叠的问题,本文提出一种快速去卷叠的LFM信号参数估计方法,该方法首先使用希尔伯特变换提取瞬时相位,再利用抛物线预测进行去卷叠处理,最后使用最小二乘对瞬时相位进行二次拟合,从而估计出LFM信号的初始频率和调频率参数。仿真结果验证了本文方法的有效性。

Aiming at the problem that extracting instantaneous phase will occurs wrapping in the parameters estimation of the LFM signal polluted by noise.A fast unwrapping LFM signal parameter estimation method is proposed in this paper,which firstly using the Hilbert transform to extract the instantaneous phase,then unwrapping the phase by using the Parabola Prediction,finally use the least squares to the instantaneous phase quadratic fitting to estimate the initial LFM signal Frequency and frequency tuning parameters.Simulation results verify the effectiveness of the proposed method.