基于DPT的非线性调频信号的DOA估计

摘要

A novel algorithm for the direction of arrival (DOA) estimation of wideband nonlinear frequency modulation signal using discrete polynomial-phase transform (DPT) is introduced. In this paper, firstly, a nonlinear FM(NLFM) signal is modeled as a high-order polynomial phase signal (PPS).And then, through high order instantaneous moments,the polynomial phase transformation is carried on.After that,the higher-order polynomial phase signal can be transformed into a single sinusoidal signal and the new noise.The ROOT-MUSIC or ESPRIT algorithm is then used to estimate the DOA of the single sinusoidal signal. Theoretical analysis and simulation results show this method is simply and estimation performance is good.%提出了一种基于DPT的宽带非线性调频信号的DOA估计算法.首先将非线性调频(NLFM)信号建模为高阶多项式相位信号(PPS)模型,然后通过高阶瞬时矩进行多项式相位变换.接收信号将变换为单个正弦信号和新的噪声.再利用ROOT-MUSIC或者ESPRIT算法对变换得到的正弦信号的波达方向进行估计.理论分析和仿真结果表明,该方法计算量小,易于实现,且估计性能好.