基于Wigner-Hough变换的P3／P4多相码雷达信号检测研究

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

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。

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 waveforrns in the presence of strong noise effectively.