条带测深系统中使用多子阵的海底探测技术

基金项目:

海司航保部资助项目 H/HCS-017

Sea bottom detection technique using multi-subarrays in swath bathymeter system

School of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China

摘要: 介绍了一种建立在与相位信息相联系的分离孔径方法的基础上的、用于多波束测深声纳的海底探测方法。作为分离孔径方法的推广, 多子阵可用于估计海底回波的到达方向(DOA), 应用图像变换从相位信息中计算海底的深度。利用计算机仿真及研制的多波束条带测深仪记录的数据进行处理, 结果表明, 这种方法改善了非镜向区域的海底检测性能, 有效提高了边缘波束的测深精度, 解决了幅度检测法在大入射角时测量误差较大的问题
- 海底探测 /
- 条带测深系统 /
- 多波束 /
- 多子阵 /
- 相位斜率
Abstract: A bottom detection method used in the multibeam bathymeter sonar is introduced. The method is based on the separate aperture method, which is associated with phase information. As the generalization of the separate aperture method, multi subarrays can be used to estimate DOA of bottom echoes, and the depth is calculated by image transform using phase information. This technique was simulated by computer and tested with experimental data. The results show that this method can improve measurement accuracy of large angles of incidence, efficiently advance depth measurement precision and solve the problem of relative big measurement errors using amplitude based method when angles of incidence is large.
- sea bottom detection /
- swath bathymeter system /
- multi beam /
- multi subarrays /
- phase slope

图 1 利用两个子阵的分离孔径相关器

Figure 1. Phase interferometry using two subarrays

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图 2 控制角度为β, 束宽为θ的波束

Figure 2. A beam with steering angle β and beam width θ

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图 3 计算机仿真实验结果(一)

Figure 3. Computer simulation results (1)

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图 4 计算机仿真实验结果(二)

Figure 4. Computer simulation results (2)

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图 5 多子阵的海试数据处理

Figure 5. Experimental data processing using multi-subarray

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图 6 不同控制角度的FFT波束形成图

Figure 6. FFT beamforming of different control angle

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表 1 若干角度对应的深度值

Table 1. Depths at some angles

下载: 导出CSV

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