亚音速飞行目标气动噪声方位角估计技术

亚音速飞行弹道气动声源是宽带非平稳噪声。提出基于小波函数的波达方向估计算法,并采用时频分析方法进行特征分析,获取气动噪声显著目标特性。通过优化时间-空间谱特征,对在时频域空间谱的目标信号进行优化,从而增强目标信号在空间谱上的显著性,最终有效实现亚音速飞行弹道气动声源的角度估计。实验数据验证表明,基于时频分析阵列信号处理模型,可以更好地实现亚音速飞行目标气动噪声方位角估计。

Azimuth angle estimation technology of subsonic flight vehicle

The aerodynamic noise of subsonic flight trajectory is wideband non-stationary noise. A new direction of arrival estimation algorithm based on wavelet function was proposed. The time-frequency analysis method was used to obtain the significant characteristics of the aerodynamic noise. By optimizing the characteristics of space-time spectrum, the target signal in time-frequency domain was optimized to enhance the significance of the target signal in space spectrum, effectively realizing the azimuth angle estimation of the aerodynamic noise of the subsonic flight vehicle finally. The experimental data shows that array signal processing model based on time-frequency analysis can better achieve the azimuth angle estimation of aerodynamic noise of subsonic flight vehicle.