摘要
动物回声定位使用了双曲调频形式的超声波。深入分析了宽带双曲调频信号的时间尺度和时间平移的互换效性。以自小波变换为工具,推导了矩形包络双曲调频信号的时间-尺度峰脊特性。作为比较,对线性调频信号进行了时间-尺度分析。仿真结果验证了宽带双曲调频信号的自小波变换直线峰脊特性优于线性调频信号。实时仿真结果表明了宽带双曲调频信号在水下信号处理中的应用前景。
Ultrasound formed as hyperbolic modulation fi＇equency （HFM） is successfully used in echolocation by some animals. The interchangeability between time scale and time shift of wideband HFM signal was proposed. The self-CWT ridge of the rectangle enveloped HFM signal was derived in detail Also the analysis of the LFMsignal was given as a contrast. Simulation proves that property of self- CWT ridge of rectangle enveloped HFM signal is better than that of LFM signal. The real-time simulation results show the prospect ofwideband HFM signals in underwater signal processing applications.
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2008年第19期5324-5327,共4页
Journal of System Simulation
基金
China Postdoctoral Sciencefoundation (20070411143).
