| 王超,王忠康.对无临近点信息干涉条纹的参数估计[J].声学技术,2016,35(2):162~166 |
| 对无临近点信息干涉条纹的参数估计 |
| Parameter estimation from interference striation under no information on the most approaching point |
| 投稿时间：2015-09-25 修订日期：2015-12-10 |
| DOI：10.16300/j.cnki.1000-3630.2016.02.014 |
| 中文关键词: 干涉条纹|无临近点信息|广义radon变换|宽容性参数估计|波导不变量 |
| 英文关键词: interference striation|without the information of MAP|generalized radon transforms|robust parameter estimation|waveguide invariant |
| 基金项目:国家高技术研究发展计划(2011AA09A107) |
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| 中文摘要: |
| 用广义radon变换可以从运动目标产生的干涉条纹中估计出目标的运动参数和波导不变量。但是当干涉条纹中没有出现临近点时,用此方法估计不出真实值。为了解决此问题,提出了一种新的估计方法。主要过程是先从时频图中提取出干涉条纹轨迹,再去搜索与此轨迹误差最小的最优曲线,此曲线的参数值代表目标的运动参数和波导不变量。仿真和海试结果表明,在干涉条纹无临近点信息情况下,用广义radon变换估计的参数值与真实值偏差很大,但是文中提出的方法仍能估计出较准确的结果。 |
| 英文摘要: |
| An interference structure can be observed in low frequency continuous spectral sound field. The interference striations are a set of quasi hyperbolas as the source goes through the receiving hydrophone. The motion parameter of the source and the waveguide invariant can be estimated by using generalized radon transforms. The vertex of the quasi hyperbola represents the closest distance between source and receiving hydrophone, and the vertex is called the most approaching point (MAP). The generalized radon transforms need the vertex information, namely t0 and f0 (t0 is the time of the target arriving at MAP and f0 is the corresponding frequency at the quasi hyperbolas vertex). Without the vertex information, the estimation error is large. This paper presents a new way to estimate parameters under no information on MAP. In this way, the trajectory of the interference striation is first extracted for subsequently searching out the optimal parameter values. The error can be represented by a tolerance cost function. The simulation and sea-trial results show that this method can get an accurate result of parameter estimation under no information on the most ap-proaching point. |
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