基于H_∞滤波器的多分量线性调频信号参数估计

Estimation of the Parameters of the Multiple LFM Signals Based on H_∞ Filter

针对多分量线性调频信号数据长度较短的情况,利用多分量线性调频信号的时空域信息,将其分解成多个单分量线性调频信号。针对未知噪声的情况,利用有限长H∞滤波器的良好瞬时特性和鲁棒特性,对每个单分量线性调频信号的参数进行估计,进而实现多分量线性调频信号参数估计。由于采用H∞平方根估计算法,此方法能够抑制递推计算的发散。计算机仿真表明了此方法的有效性。

In case of less sample data for the multiple linear frequency modulation （LFM） signals, the multiple LFM signals are decomposed into a few of the single LFM signal by time-space rotational techniques. Based on the better transient and robust performance of the finite-horizon H∞ filter, the parameter of each single LFM signal is estimated in case of the unknown noise. Because of adopting H∞ square-root algorithm for H∞ filter, this algorithm is numerically more stable than conventional ones. Simulations are presented to show the capabilities of this parameter estimate algorithm.