| 一种提高多普勒测速仪测频精度的方法 |
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| 引用本文： | 杨海东,白书华.一种提高多普勒测速仪测频精度的方法[J].声学技术,2017,36(6):539-544. |
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| 作者姓名： | 杨海东 白书华 |
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| 作者单位： | 南昌理工学院, 江西南昌 330044,南昌理工学院, 江西南昌 330044 |
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| 基金项目： | 江西省教育厅2015年度科学技术项目（GJJ151171） |
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| 摘 要： | 多普勒测速仪是水面或水下平台速度测量的主要设备。提出了利用随机样本一致(Random Sample Consensus,RANSAC)算法来估计多普勒频移,从而使速度测量具有更高的稳定性。多普勒测速仪信号处理的核心是测量多普勒频移,该方法利用回波复相关相位是多普勒频移的一次函数来估计多普勒频移,进而计算得到平台速度,在估计频移时采用RANSAC算法以提高测频精度。为了验证方法有效性,对信号形式为连续波(Continuous Wave,CW)脉冲对的情形进行了仿真。结果表明,提出方法的稳定性得到明显提高。
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| 关 键 词： | 多普勒测速仪 测频 随机样本一致 |
| 收稿时间： | 2017/4/9 0:00:00 |
| 修稿时间： | 2017/8/18 0:00:00 |
A method to improve the frequency measurement accuracy of Doppler velocity log |
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| YANG Hai-dong and BAI Shu-hua.A method to improve the frequency measurement accuracy of Doppler velocity log[J].Technical Acoustics,2017,36(6):539-544. |
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| Authors: | YANG Hai-dong and BAI Shu-hua |
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| Affiliation: | Nanchang Institute of Technology, Nanchang 330044, Jiangxi, China and Nanchang Institute of Technology, Nanchang 330044, Jiangxi, China |
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| Abstract: | Doppler Velocity Log (DVL) is the mainstream equipment for measuring the velocity of surface or underwater platform. In this paper, the RANSAC (Random Sample Consensus) algorithm is used to estimate the Doppler frequency shift, so that the velocity measurement has higher stability. The main step of DVL''s signal processing is to measure the Doppler frequency shift according to the principle that the phase of complex correlation is a liner function of the Doppler frequency shift. Then, the speed of the platform is calculated and the measurement accuracy is improved by using RANSAC algorithm. In order to verify the effectiveness of the method, the simulation is made in which the signal form of CW (Continuous Wave) pulse pairs is used. The results show that the stability using the proposed method is obviously improved. |
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| Keywords: | Doppler velocity log frequency measurement random sample consensus |
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