基于波达方向估计的三维前视声像声纳关键技术研究
文献类型：学位论文
| 作者 | 张顺 |
| 学位类别 | 博士 |
| 答辩日期 | 2008-05-29 |
| 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 | 波束形成 波达方向估计 相位法 三维前视声像声纳 |
| 其他题名 | The Research on Key Techniques of 3D Forward Looking Image Sonar Based on Direction of Arrival Estimation (DOA) |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 目前，安装在水下载体上的前视声纳采用的常用技术中，二维波束形成技术是以傅立叶变换为基础的，角度分辨能力受到波束开角Δθ~λ/L的限制，阵面尺寸较大；而二维波达方向估计技术虽然提高了分辨率，但是在空间中同时到达的回波个数较多的复杂情况下，不能有效地分辨出多个目标。 为了克服二维波束形成技术和二维波达方向估计技术的缺点，本文介绍了一种结合常规波束形成技术、相位法和波达方向估计技术的信号处理方法。它采用平面阵作为接收阵，在接收阵的水平方向采用常规波束形成技术，并利用相位法估计出水平方向的入射角，提高水平方向的分辨率；在波束内采用波达方向估计技术获得垂直方向的入射角，提高垂直方向的分辨率，从而形成声纳阵前方目标的三维声像。采用这种方法的前视声纳具有体积小、重量轻并且分辨率高的特点，非常适合安装在水下载体上，用于探测声纳阵前方三维空间中的目标、障碍物和海底。 在理论研究的基础上，结合国家863项目“基于波达方向估计技术的三维前视声像声纳关键技术研究”，我们对该信号处理方法进行了计算机仿真实验，并对结果进行了初步分析。仿真结果表明：在接收阵面面积相同的条件下，这种信号处理方法能够获得优于常规技术的垂直分辨率和水平分辨率，性能到达了预期目标。以上结果在公开文献中未见报道。 |
| 英文摘要 | For conventional forward looking sonar which can be installed on underwater vehicle, the adopted two-dimensional beam forming principle is based on Fourier Transform. The angle resolution is limited by the beam width, i.e., Δθ~λ/L, which results in a too large array for high resolution. Two-dimensional direction of arrival (DOA) estimation can improve the resolution, but in the complicated condition where echoes from several targets arrived at the same time, these targets can’t be distinguished effectively. To overcome the disadvantages of 2D beam forming principle and 2D DOA, this dissertation introduces a signal processing method which combines conventional beam forming principle, phase estimation technique and DOA estimation. It uses a plane array as receive array. The conventional beam forming principle is used in horizontal direction of the receive array, and phase estimation technique is used to estimation the horizontal incident angle to improve horizontal direction resolution. Also in the beam, DOA estimation is used to get vertical incident angle to improve vertical direction resolution. Finally it can get 3D image in the front of sonar array. With this method, forward looking sonar has characteristics of small volume, light and high resolution, so it is suitable to be installed on underwater vehicle to detect targets, obstacles and seabed in the front 3D space of the sonar array. Based on the theory, supported by Chinese National 863 project with item “The research on key technique of 3D forward looking image sonar based on DOA estimation”, we simulated the signal processing method, and analyzed results preliminarily. The results demonstrate that if the areas of receive arrays are the same, this method can get higher vertical and horizontal resolution than conventional techniques, and its performance meets expectation. The results listed above have not been reported in published papers. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 65 |
| 源URL | [http://159.226.59.140/handle/311008/384]  |
| 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 | 张顺. 基于波达方向估计的三维前视声像声纳关键技术研究[D]. 声学研究所. 中国科学院声学研究所. 2008. |
入库方式： OAI收割
来源：声学研究所
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