A Wideband HFM Signal Detection Method Based on Wavelet-Radon Transform
-
摘要: 动物回声定位所用超声波具有双曲调频的形式，充分利用仿生信号的特性可以提高水下信号处理系统的性能。阐述了宽带仿生信号的时间-尺度特性，针对直线形式的回波小波峰脊，将宽带目标回波检测问题转化为小波变换2D平面上的直线检测问题，提出了一种基于Wavelet-Radon变换的宽带仿生信号检测方法，并进行了仿真验证。结果表明,该检测方法充分利用了宽带仿生信号的特性，同时也验证了选择宽带双曲调频信号作为发射信号的合理性。
-
关键词:
- 双曲调频 /
- Wavelet- Radon变换 /
- 信号检测 /
- 水下信号处理
Abstract: Some animals uses the ultrasound with hyperbolic frequency modulation (HFM) form for echolocation. Hence the performance of underwater signal processing system can be enhanced by making use of the characteristics of the bionic signal. In this paper, the peak ridge characteristic of wideband bionic signal is described, then a detection method based on wavelet-Radon transform is presented, which converts the wideband echo detection into a linear detection on wavelet transform plain. Simulation results verify that the presented method makes full use of the characteristics of the wideband bionic signal, and the wideband HFM signal is applicable for underwater signal processing system. -
[1] Busnel R G,Fish J F.Animal Sonar System[M].Plenum Press,1980. [2] Young R K.Wavelet Theory and Its Applications[M].Kluwer Academic Publishers,1993. [3] Van Trees H L.Detection, Estimation and Modulation Theory[M].Wiley. Part I, 1968; Part III, 1971. [4] Wang M S,Chan A K,Chui C K.Linear Frequency-Modulated Signal Detection Using Radon-Ambiguity[J]. Transform. IEEE Trans,1998, 46(3):571-586. [5] Deans S R.The Radon Transform and Some of Its Applications[M]. John Wiley and Sons,1983. [6] Kelly B T, Madisetti V K.The Fast Discrete Radon Transform-I:Theory[J].IEEE Trans,1993,2(3): 382-400. -
点击查看大图
计量
- 文章访问数: 2179
- HTML全文浏览量: 2
- PDF下载量: 649
- 被引次数: 0
下载:
