Page 44 - 《应用声学》2024年第1期

第 43 卷 第 1 期 Vol. 43, No. 1
2024 年 1 月 Journal of Applied Acoustics January, 2024

⋄ 研究报告 ⋄

波束开角对多普勒测频结果的影响 ∗

陈 茁 1,2 王长红 1,3 邓 锴 1,3†

(1 中国科学院声学研究所 北京 100190)
(2 中国科学院大学 北京 100049)
(3 北京市海洋声学装备工程技术研究中心 北京 100190)
摘要：具有不同波束开角的声学多普勒测速设备未标定的测速结果存在偏差。基于水底椭圆散射模型研究了
波束开角对声学多普勒测速结果的影响，对提高声学测速性能具有实际意义。水底椭圆散射模型下，足印上不
同方位传播损失和散射强度存在差异，导致频谱不对称，测频结果偏小。利用不对称系数量化频谱不对称程
度，若波束开角增大，方位不对称系数随之增大，测频偏差增大, 推导了波束开角导致的测频偏差解析式。分析
仿真和外场试验数据测频结果可知，不同多普勒频移下测频偏差和理论计算值相符，不同波束开角下实际测
频偏差与理论公式计算的测频偏差均随波束开角增大而增大。
关键词：宽带多普勒测速；波束开角；误差分析
中图法分类号: TN911.7 文献标识码: A 文章编号: 1000-310X(2024)01-0040-07
DOI: 10.11684/j.issn.1000-310X.2024.01.005

The influence of beam angle on Doppler frequency measurement result

CHEN Zhuo 1,2 WANG Changhong 1,3 DENG Kai 1,3

(1 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(2 University of Chinese Academy of Sciences, Beijing 100049, China)
(3 Beijing Engineering Technology Research Center of Ocean Acoustic Equipment, Beijing 100190, China)

Abstract: The uncalibrated results of acoustic Doppler velocity measurement equipment with different beam
angles are deviated. The influence of beam angle on the result of acoustic Doppler velocimetry is studied, in
which underwater ellipse scattering model is adopted, and the conclusion is of practical significance to improve
the performance of acoustic velocimetry measurement. When the ellipse scattering model is adopted, there are
differences in propagation loss and scattering intensity from different directions, which result in asymmetric
spectruman and small frequency measurement results. Using the asymmetry coefficient to quantify the degree
of spectrum asymmetry, if the beam angle increases, the azimuth asymmetry coefficient increases, which leads
to the growth of the frequency deviation. Besides, the expression of frequency measurement deviation caused
by beam angle is derived. By analyzing the frequency measurement results of simulation and field test data,
it can be seen that the frequency measurement deviation under different Doppler frequency shifts is consistent
with the calculated value of the formula, and the actual frequency measurement deviation under different beam
angles increases with the increasing beam angle.
Keywords: Broadband Doppler velocimetry; Beam angle; Errors analysis

2022-09-30 收稿; 2022-11-28 定稿
国家重点研发计划项目 (2022YFC3104103)
∗
作者简介: 陈茁 (1998– ), 女, 黑龙江伊春人, 硕士研究生, 研究方向: 信号与信息处理。
† 通信作者 E-mail: dengk@mail.ioa.ac.cn