海洋波导中水平阵列和垂直阵列抑干扰研究
文献类型：学位论文
| 作者 | 黄晓砥 |
| 学位类别 | 博士 |
| 答辩日期 | 2004 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 中国科学院声学研究所 |
| 关键词 | 干扰 阵列信号处理 声传播 波导不变性 匹配场 |
| 其他题名 | Study on the interference suppression in waveguide for horizontal array and vertical array |
| 中文摘要 | 实际应用中，‘干扰’往往是制约阵列信号处理性能的重要因素，因此抑制干扰成为阵列处理的重要研究内容。海洋波导中的阵列抑制干扰处理有其特殊性。本文讨海洋论波导（以下简称波导）中水平阵列和垂直阵列抑制干扰的方法。波导中传播的声波为简正波而非平面波。无论水平阵还是垂直阵，阵列接收信号是以简正波的形式传播到达接收阵列，因而，严格适用的阵列处理方法是匹配场阵列处理方法。但在许多情况下，波导中传播的声信号可以近似为平面波到达阵列，这时自由空间的常规阵列处理方法是适用的。给出接收信号到达阵列形式的判据是必不可少的。论文首先分析并给，匹配场阵列处理方法和常规阵列处理方法的适用条件，即阵列接收信号平面波假设的成立条件。在水平阵抑制干扰的研究中，论文提出了零点展宽的稳健波束形成方法。这种方法基于接收信号平面波假设，用重构阵列接收信号的互谱矩阵，使其不含有期望信号成份。通过最大化阵列输出的信干噪比，得到抑制干扰的阵列权矢量。波导中传播到达的声波由多个简正波组成。简正波间的干涉使接收声波在空间一频率（r-ω，z-ω）、空间一时间（r-t，z-t）平面上呈现出特定的干涉结构。本文分析r-ω 平面上的干涉结构，即波导不变性，研究波导不变性在阵列匹配场处理中的应用。垂直阵列的接收信号一般需考虑简正波传播形式，其抑制干扰的方法与水平阵的处理方法有显著的区别且与波导中声传播的规律有关。本文分析了阵列接收信号互谱矩阵的波导不变性，提出了r-ω。平面上聚焦的匹配场定位自适应方法。这种方法将不同频率的互谱矩阵汇聚形成瞬时的互谱矩阵估计，能够对瞬态目标和运动目标实施高分辨的匹配场定位处理。本文还提出了匹配场处理中将垂直阵零点指向干扰的方法，用以垂直阵波束形成中的干扰抑制。通过海上实验验证了本文提出的系列阵列抑制干扰方法。 |
| 英文摘要 | In practice, interference is always the major cause of the performance degradation for array signal processing. Interference suppression is a focus in array signal processing accordingly. This thesis gives an intensive study on how to suppress interference for horizontal arrays and vertical arrays in the waveguide. In the waveguide, sound wave propagates in normal modes instead of plane wave. Strictly, the matched field processing (MFP) is the best method in this case. However, normal mode waves can be approximated as plane waved in many cases, the conventional array signal processing methods can be used again at this time. First of all, this thesis gives the applicable conditions for MFP and conventional array signal processing. Secondly, the thesis gives a study on interference suppression for horizontal arrays. A null broaden beamforming method is proposed to tackle this problem. In this method, a cross-spectrum matrix is reconstructed by utilizing the prior knowledge about the interference and the noise. The array weight matrix is obtained by maximizing the signal to interference and noise ratio (SINR) of the cross-spectrum matrix for interference suppression. The propagated sound wave in the waveguide is composed of several normal mode waves. Some certain interference effects would occur to the spatial-frequency plane and spatial-temporal plane due to the interference among the normal mode waves. Thirdly, waveguide invariant is introduced to analyze the interference effects and study the matched field processing for arrays. An adaptive method for MFP localization is proposed finally by analyzing the waveguide invariant of the cross-spectrum matrix of the receiving signals. This method can fulfil an accurate MFP localization for instantaneous targets and moving targets by focusing the cross-spectrum matrices of different frequency bins on a cross-spectrum matrix of instantaneous frequency. The efficiency of the interference suppression methods proposed in this thesis are testified by the sea test. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 78 |
| 源URL | [http://159.226.59.140/handle/311008/848]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 黄晓砥. 海洋波导中水平阵列和垂直阵列抑干扰研究[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2004. |
入库方式： OAI收割
来源：声学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。