| 题名 | 空间谱估计中的阵列误差校正方法研究 |
| 作者 | 叶根 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-26 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 阵列校正 幅相误差 波达方向估计 水声换能器阵 |
| 其他题名 | Research on Array Calibration in Spatial Spectrum Estimation |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 在阵列信号处理中，大多数波达方向（Direction of Arrival,简写为DOA）估计算法在阵列流型精确已知的前提下具有很高的分辨性能。但是在实际的工程应用中，由于阵列误差的存在，会使得阵列流型产生一定的偏差，从而会导致 DOA算法性能急剧下降。因此对于阵列误差校正方法的研究十分必要。 现有的阵列误差校正方法基本是在一定的前提条件下才能得到满意的结果，而水声换能器阵往往不能满足这些前提条件，所以限制了这些方法在水声换能器阵列校正中的应用。本文提出一种针对水声换能器线阵的幅相误差校正方法，利用水池回转机构旋转角度的相对值容易精确控制的特性，使被测阵列逐个接收多个入射角不同的测试信号，准确估计出各测试信号的入射方向，然后估计出阵列中每个阵元幅相误差随入射角变化的曲线，最后可利用这些曲线对回波信号波达方向估计进行校正。通过水池实验研究，得到了高分辨率测深侧扫水声换能器接收线阵各通道幅相误差曲线，并验证了利用该曲线进行DOA校正的有效性。该方法不需对阵列误差进行微扰动假设和各向一致性假设,对水声换能器线阵幅相误差校正具有一定的普遍适用性，尤其适用于高频水声换能器阵的情况。 |
| 英文摘要 | In array signal processing, most DOA (Direction of Arrival, abbreviated as DOA) estimation algorithms have high-resolution performance under the premise of accurately known array manifold. However, in practical engineering applications, due to the existence of the array error, certain deviation will be brought into the array manifold, which would lead to sharp decline in the performance of DOA algorithms. Therefore, the research on array calibration method is necessary. Traditional methods of array calibration can only perform well in certain conditions which can't be fully satisfied for underwater acoustic transducer array, which limit their applications in the underwater sensor array calibration. A new approach of array gain and phase error calibration for sonar sensor array is presented in this paper. Using the rotating machine which can be controlled precisely, testing signals from different angles can be received by the sonar array. Then, the array gain and phase error curves with source directions can be estimated by the signal processing algorithm. These curves can be used to calibrate the sonar array gain and phase error. Gain and phase error curve for each linear receiving channel of high-resolution bathymetric side-scan acoustic transducer array was obtained and the calibration method is validated in water tank tests. This method doesn’t need to assume that the array error is small and same in different angle, which makes it more applicable. It is especially suitable to calibrate the high-frequency sonar sensor array. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 71 |
| 内容类型 | 学位论文 |
| 源URL | [http://159.226.59.140/handle/311008/572]  |
| 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 | 叶根. 空间谱估计中的阵列误差校正方法研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
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