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分析了宽带延展目标的时延-时间伸缩效应,及其导致的回波信号在时域和频率域的特性.针对LFM信号的时频分布特点,利用匹配追踪和R adon变换,提出了一种提取LFM信号在时-频域分布特性参数的时延-时间伸缩声成像方法,有效避免了利用W VD时产生的交叉项影响.通过计算机仿真与实验验证,表明该方法是有效的.
The time delay and time scaling effect of the broadband extension target and the characteristics of the echo signal in the time and frequency domain are analyzed. According to the characteristics of the time-frequency distribution of the LFM signal, a match is made between the tracking and the R adon transform The time-delay telescopic acoustic imaging method, which extracts LFM signal’s time-frequency domain distribution parameters, effectively avoids the influence of the cross term caused by the use of WVD. It is proved by computer simulation and experimental verification that this method is effective.