• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Signal processing >Instantaneous frequency tracking of a sinusoidally frequency-modulated signal with low modulation index: application to laser measurements in acoustics
【24h】

Instantaneous frequency tracking of a sinusoidally frequency-modulated signal with low modulation index: application to laser measurements in acoustics

机译：具有低调制指数的正弦频率调制信号的瞬时频率跟踪：在声学中的激光测量中的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, the problem of the instantaneous frequency (IF) estimation of sinusoidally frequency-modulated signals has been addressed, especially when small modulation indices are involved. Such a problem is encountered when laser-Doppler velocity measurements are carried out in acoustics. The amplitude and phase of the sine-wave IF law are then the searched parameters. A new time-frequency transform, specifically designed for tracking sine wave IF variations has been developed, using as a starting point the formalism of the Polynomial Wigner-Ville distributions. The computation of this transform, quick and simple, followed by an amplitude and phase estimation of the IF law, is the so-called Time-Frequency Synchronous Detector (TFSD). After a derivation of the Cramer-Rao bounds for the estimation of the searched parameters, the performances of the detector are studied and compared to those of the Cross Wigner-Ville-based estimator (CWV) and those of a parametric estimator based on the maximum likelihood (ML), For moderate SNR, the TFSD represents a better compromise in terms of bias, variance and computational time than the CWV. The ML performances are slightly better for synthesized signals than those of the time-frequency methods, but the latter provide significantly better estimates for experimental signals.
机译：在本文中，正弦频率调制信号的瞬时频率（IF）估计问题已得到解决，特别是在涉及小的调制指数时。当在声学中进行激光多普勒速度测量时会遇到这样的问题。然后，搜索到的参数是正弦波IF律的幅度和相位。已经开发了一种新的时频变换，专门设计用于跟踪正弦波IF变化，使用多项式Wigner-Ville分布的形式主义作为起点。这种转换的计算既快速又简单，随后是IF律的幅度和相位估计，即所谓的时频同步检测器（TFSD）。在推导用于估计搜索参数的Cramer-Rao边界后，研究了检测器的性能，并将其与基于Cross Wigner-Ville的估计器（CWV）以及基于最大值的参数估计器的性能进行了比较。对于中等SNR，TFSD在偏差，方差和计算时间方面表现出比CWV更好的折衷。合成信号的ML性能比时频方法的ML性能稍好，但是后者为实验信号提供了更好的估计。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号