瞬时频率方差加权导向最小方差波束形成检测器

Variance of instantaneous frequency-weighted steered minimum variance beamforming detector

为了克服传统线谱检测四维显示的难点,根据被动目标辐射噪声中含有高强度的稳定线谱这一特征,提出了一种针对线谱目标检测的阵列信号处理方法.从理论上分析了利用短时傅里叶变换估计含有线谱的辐射噪声的瞬时频率方差特性,将其与导向最小方差波束形成相结合,通过各方位的频率方差对波束输出进行加权,有效地提高导向最小方差波束形成对于线谱目标的检测能力.海试结果验证该方法的可行性与有效性,在多目标、强干扰的环境下,可以探测到弱线谱目标.

In order to overcome the difficulty of a four-dimensional display in traditional line spectrum detection,regarding the fact that the radiated noise of a passive target contains a highly intensive and stable line spectrum,an array processing method for detecting targets with line spectrums was proposed.The estimation of the variance of instantaneous frequency with short-time Fourier transformation was theoretically analyzed,and was integrated with steered minimum variance（STMV） beamforming.Through weighting beam output with its own variance of instantaneous frequency,the detection capacity of original beamforming to the line spectrum target was effectively enhanced.The sea trial results indicate its validity and feasibility,and show that the variance of an instantaneous frequency weighted steered minimum variance beamforming detector is able to detect a weak line spectrum target in the background of multitudinous and strong interference.