基于Wigner-Hough变换的P3/P4多相码雷达信号检测研究

Wigner-Ville分布是分析非平稳信号的常用时频分析方法,它将一维时间信号映射到二维时频平面上,而Hough变换在图像处理和计算机视觉中经常被用来提取图像中的图形特征。文章将这2种方法结合,提出了一种检测多相码雷达信号的方法,该方法首先计算信号的Wigner-Ville分布,得到二维时频分布图,然后在时频平面上再进行Hough变换,从而检测由LFM信号得到的多相码信号,如P3和P4多相码。仿真结果证明,此方法可有效地对线性调频类多相码信号进行检测,并且有较好的抗噪声性能。

On detection of radar polyphase coded waveform based on Wigner-Hough Transform

The Wigner-Ville distribution is widely used to analyze non-stationary signals,and it maps one-dimensional time or spatial domain signal to a two-dimensional time-frequency plane.The Hough transform is an often used method to extract the graphic feature in image processing and computer vision.By combing these two methods,a new method is presented to detect the polyphase coded pulse compression waveforms.The Wigner-Ville distribution of the signal is computed firstly to obtain the 2D time-frequency image,and then the Hough transform is performed in the time-frequency plane.The detection of lines in the time-frequency plane is then reduced to a 2D searching for the peaks in the Hough transform parameter domain.Computer simulation results indicate that the method can detect the chirp-like polyphase coded waveforms in the presence of strong noise effectively.