Wigner-Hough变换在毫米波防撞雷达信号处理中的应用

毫米波车载防撞雷达的中频信号是包含目标距离和相对速度信息的信号,针对中频信号通常是被噪声和干扰污染的非平稳信号,在频域内无法获取高质量的中频信号的难题,提出了利用时频分析中的Wigner-Hough变换来提取中频信号的方法.方法根据中频信号、chirp类干扰信号和噪声在Wigner-ville时频平面上的不同统计分布特性达到进行信号区分和检测的目的,能够有效地抑制Wigner分布中交叉项的干扰,提取带有距离和速度信息的中频信号.计算机仿真结果表明该方法在检测被污染的中频信号方面是有效的.

Application of Wigner-Hough Transform in Signals Processing of Millimeter Wave Anti-collusion Radar

The target range and speed information are included in intermediate frequency signals for millimeter wave anti-collision radar. But intermediate frequency signals are usually corrupted by interferences and noises and it is difficult to get high-quality intermediate frequency signals in frequency-domain analysis. The method applying Wigner-hough transform to get intermediate frequency signals is proposed. The method detected signals according to their statistical distribution in time-frequency fields and can suppress cross term interferences effectively. Computer simulation results show thatthe proposed method is reasonable and effective to detect the corrupted intermediate fre- quency signals for radar.