自适应Notch滤波器四元平面方阵定向性能

为了提高四元平面方阵定向性能,减小其运算量,提出了用自适应Notch滤波器相位差时延估计法进行定向。方法可以动态更新参考信号频率,减小估计方差并实现无偏估计,是实现目标定向的重要途径。与通常所用的互谱法相比,在相位估计方差下界相同时,运算量显著减小。将其应用于四元平面方阵的定向,对水下主动发射信号的回波进行仿真分析,仿真结果表明,在相同的实验条件与精确度下,运算量比通常定向所用的互谱法小,有很强的工程应用价值。

Directional Performance of Four-cell-square-array in Plane Decided by Adaptive Notch Filter

To improve the directional performance of four-cell-square-array in plane,decrease its operation cost,a new method is put forward. Adaptive Notch filter phase-difference time delay estimation method can dynamically update reference signal frequency,decrease estimate variance and realize unbiased estimate,which is an important approach to realize target direction. Compared with cross-spectra,when phase estimate variance lower bound is the same,its cost is dramatically reduced.This method is used in the direc...