基于空时频联合处理的水下目标宽带声成像

杜金香; 许恒博

doi:10.11993/j.issn.2096-3920.2019.04.005

基于空时频联合处理的水下目标宽带声成像

doi: 10.11993/j.issn.2096-3920.2019.04.005

西北工业大学航海学院, 陕西西安, 710072

基金项目: 国家自然基金项目资助(61301197); 西北工业大学中央高校基本科研业务费基础研究基金(1069920140011)

详细信息

作者简介:
杜金香(1977-), 女, 博士, 副教授, 主要研究方向为阵列信号处理、目标定位以及水下声成像.

中图分类号: TJ630.34; TN911.7
计量
- 文章访问数: 367
- HTML全文浏览量: 3
- PDF下载量: 273
- 被引次数: 0
出版历程
- 收稿日期: 2018-11-22
- 修回日期: 2019-01-07
- 刊出日期: 2019-08-31

Wideband Acoustic Imaging of Underwater Target Using Spatial Time-Frequency Analysis

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

摘要

摘要: 宽带信号的声成像方法需要在距离维度和时间尺度维度进行扫描, 运算量巨大。同时, 对于水下目标探测和识别, 往往希望发射信号具有较好的多普勒宽容性, 在时间尺度维度具有较低的分辨力, 并且对于空间体目标而言, 其回波中不同波形分量对应的尺度差异较小, 因此难以准确估计目标速度, 进而去除声成像过程中由于目标运动产生的距离维误差, 从而导致成像畸变的问题。为了解决以上2个问题, 文中采用发射双向调频多普勒宽容信号的策略, 无需尺度搜索, 可以准确估计目标速度, 消除声图像在距离维度上的误差, 提高宽带信号声成像的准确性。对多亮点模型的运动目标声成像仿真结果证实了双向调频波形策略具有更好的成像性能。

Abstract: Wideband acoustic imaging for moving target needs a large amount of computation because the scan is conducted in both range dimension and time scale dimension. On the other aspect, the waveforms with Doppler tolerance for underwater target detection have low resolution in time scale dimension, which leads to poor speed estimation, as a result, the range error during the acoustic imaging cannot be eliminated effectively and the image will be distorted. To solve these two problems, positive and negative frequency modulation(FM) pulses strategy is utilized in acoustic imaging of underwater target, and the spatial time-frequency analysis, which combines beamforming in spatial domain with wideband cross-correlation in time-frequency domain, is used to analyze the echo signals. Better speed estimation can be achieved without need for scanning in time scale dimension, so the computational load is decreased and better range migration correction performance is obtained. The better performance of the positive and negative FM pulses strategy is verified by simulation results of moving target with multiple highlights.

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参考文献(11)

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