宽带声学多普勒流速剖面仪信号中心频率估计  

Center Frequency Estimation of Broadband ADCP Signal

作　　者：汪胜波[1] 姬光荣[1] 杨光兵[2] 吕连港[2] 

机构地区：[1]中国海洋大学,山东青岛266100 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《中国海洋大学学报（自然科学版）》2013年第2期87-92,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40806015);海洋公益行业专项(20100500402)资助

摘　　要：BBADCP(Broadband ADCP)具有空间和时间分辨率高、能够精确测量缓流浅水流速等诸多优点。但是使用FFT方法对其中心频率估计往往存在分辨率低、误差大和精度小等缺点。因此,发现一种能够满足准确性要求的功率谱估计方法就显得意义重大。本文首先运用常用的功率谱估计方法对仿真的BBADCP信号进行功率谱估计求取中心频率,发现MUSIC方法效果最为理想。然后再对测量的BBADCP信号进行估计,同样得出MUSIC算法对中心频率的估计最好。本文旨在找出一种估计BBADCP信号中心频率的最为优化的方法。无论从数学原理上还是实际效果来看,MUSIC方法都比其它方法更适用于BBADCP信号,满足误差要求。BBADCP （Broadband ADCP） has high temporal resolution, high spatial resolution, high accuracy and many other advantages. It can accurately measure the flow velocity of shallow water slow flow. But low resolution, low accuracy, high error and other shortcomings often come along when use FFT method to estimate its center frequency. So finding a method to meet the accuracy requirements of power spectrum estimation isof great significance. Firstly, the power spectrums of the simulated BBADCP signals were estimated with commonly used methods to gain their center frequency. As a result, the MUSIC algorithm power spectrum estimation method was the best one to gain center frequency. And then we utilized these methods to estimate the power spectrums of the measured BBADCP signals and got the same result with the former. The power spectrums of the measured BBADCP signals also show that the MUSIC method is optimal for center frequency estimation. This paper aims at finding out an optimal method of estimating BBADCP center frequency. In terms of mathematical theory and the actual effect, the MUSIC method is more suitable for BBADCP signals than other methods and better meets the error requirement.

关 键 词：BBADCP 功率谱估计 中心频率 

分 类 号：P73[天文地球—海洋科学]