宽带多普勒计程仪速度解模糊方法研究 .pdfVIP

学兔兔 第31卷 第8期 仪 器 仪 表 学 报 Vo1．31 No．8 2010年8月 Chinese Journal of Scientific Instrument Aug．2010 宽带多普勒计程仪速度解模糊方法研究 黄雄飞，苑秉成，林 伟 (海军T程大学兵器工程系 武汉 430033) 摘 要：为了解决宽带多普勒计程仪在较高速度下存在的速度模糊问题，建立了宽带多普勒计程仪的回波模型，分析了回波 的自相关特性。在不改变系统结构的基础上，提出了采用回波自相关的第1个峰值位置的方法确定速度范围，并与复协方差 方法结合实现无模糊地估计速度，从而解决测速模糊问题，同时提出采用 点相关插值算法估计自相关峰的位置。最后采用 湖试数据分析和数字仿真证明了这种解模糊方法的有效性。 关键词：声学；多普勒计程仪；相位编码；速度模糊 中图分类号：TB551 文献标识码：A 国家标准学科分类代码：120．60 Solution to velocity ambiguity of broadband Doppler velocity log Huang Xiongfei，Yuan Bingcheng，Lin Wei (Department of Weaponry Engineering，Naval University of Engineering，Wuhan 430033，China) Abstract：To solve the problem of velocity ambiguity under high speed in broadband Doppler velocity log，an echo model of broadband Doppler velocity log was established，and the autocorrelation characteristic of echo was analyzed． A solution to velocity ambiguity is proposed，which does not change the structure of Doppler velocity log．The veloci— ty can be estimated unambiguously using the first peak of autocorrelation of echo；and the velocity range is decided， which is combined with complex covanance method and the velocity can be measured unambiguously，thus velocity ambiguity is solved．At the same time，a method of three—point interpolation of correlation for estimating the first peak of autocorrelation is proposed．Analyses of lake experiment data and digital simulation prove that the proposed solution to velocity ambiguity is effective． Key words：acoustics；Doppler velocity log；phase coding；velocity ambiguity 小，因此，解决速度模糊问题变得更加重要。Tigrek等 1 引 言