海豚声纳信号的脉冲分解及特征分析

Pulse separation and characteristics analysis of dolphin's sonar signal

提出一种海豚声纳目标探测脉冲串信号的脉冲分解方法,在此基础上对海豚声纳脉冲信号的特征进行了分析,其中包括脉冲宽度、脉冲间隔以及脉冲的时间分辨率和频率分辨率,并采用耳蜗滤波对海豚声纳脉冲串信号的时频特征进行了分析。分析结果表明,探测目标的过程中,根据目标距离的不同,海豚会自适应调节脉冲信号的发射频率和信号形式。

A pulse separation method is proposed to decompose dolphin＇s sonar target-detecting pulse sequence signal. The characteristics of the dolphin sonar signal are then analyzed for its duration, interval as well as its time and frequency resolution. Besides, the cochlear filter is applied to obtain the time-frequency distribution of the click pulse. Results show that, dolphin adjusts the emitting frequency and the signal form adaptively according to the distance from the detected target.