一种基于小波包变换的反辐射导弹检测技术

ARM detection technique based on wavelet packet transform

针对雷达回波中的载机为单频信号且占主导地位,而导弹为宽带调频信号,应用正交小波包变换可以分离不同频带的回波信号的特点,提出了一种应用小波包变换检测反辐射导弹(ARM)的方法。其中小波包系数反映信号在相应频段的能量分布,依据小波包能量进行自适应阈值处理,小波包重构后即可有效抑制回波中的强载机分量。仿真显示,这种方法能够将微弱的ARM信号有效地检测出来。

A new method for anti-radiation missile(ARM) detection based on WPT (wavelet packet transform) is proposed. Since the aircraft signal in the radar echoes is monochromatic and dominant, and the ARM signal is wide-band chirp, echoed signals may be decomposed into different frequency bands by orthogonal wavelet packet transform. Signal energy in the corresponding frequency band is reflected on the wavelet packet coefficients. Via adaptive thresholding based on the wavelet packet energy, the strong aircraft signal can be well restrained through wavelet packet reconstruction. Computer simulation shows the detection of weak ARM signal can be well accomplished.