基于长基线和超短基线联合的拖曳目标定位技术

Towed target positioning technology based on long baseline and ultra-short baseline combination

[目的]为了精确获取水下运动拖曳目标的位置,同时方便试验过程中的基线部署,[方法]将长基线和超短基线水声定位技术结合,通过超短基线定位基阵获取拖曳目标的粗略位置;以此作为长基线定位的先验数据,将甲板单元换能器和超短基线定位基阵作为长基线的阵元,结合超短基线定位先验数据,通过长基线定位技术获取更高精度的目标位置。[结果]湖上定位精度测试结果表明,当仅采用超短基线方法时,目标定位的均方根(RMS)误差为6.8 m;采用长基线和超短基线联合的定位方法时,RMS误差值为2.5 m,提高了水下拖曳目标的定位精度。海上试验表明,该系统在满足精度要求的同时也便于开展海上试验。[结论]该技术融合了甲板单元的测距信息和超短基线的定位结果来进行长基线联合定位,能够对水下拖曳目标实施高精度定位,为特定需求的海上试验或作业提供技术支撑。

[Objectives]This research aims to obtain accurate positioning in underwater towing and facilitate its use and deployment during experiments.[Methods]Long baseline and ultra-short baseline acoustic technology are combined,the rough position of a towed target is obtained using the ultra-short baseline positioning array and the position is used as a priori data for long baseline positioning.On this basis,the long baseline array elements of the deck unit transducer and ultra-short baseline positioning array are combined with the short-term baseline positioning a priori data and long baseline positioning technology so as to obtain higher positioning accuracy.[Results]The long-baseline and ultra-short baseline joint positioning method is used to improve the positioning accuracy of towed underwater targets.The results of positioning accuracy tests conducted on a lake show that the Root-Mean-Square(RMS)error is 6.8 m when the ultra-short baseline method is adopted.However,the RMS value is just 2.5 m when the long baseline and ultra-short baseline are combined,solving the problem of positioning accuracy within short distances.[Conclusions]By combining the long-range baseline information of the deck unit's ranging information and the ultra-short baseline positioning results,this technology can achieve the high-precision positioning of towed underwater targets and provide technical support for the specific needs of offshore testing and operations.