高精度定位标定系统水下基准方位误差分析

Error analysis of underwater benchmark for precision positioning system

水下基准(换能器)位置的精确测量是高精度定位标定系统的关键技术,它的方位精度直接影响到水声定位系统定位误差的计量。通过详细分析了水下基准安装柱扰曲形变、GPS定位误差、罗经测向误差、纵倾横摇角测量误差对高精度定位标定系统水下基准位置的影响。通过合理的工程数据假设,提出选用误差小于0.15m的高精度GPS,则水下基准的误差将稍大于0.3m的结论,为工程应用上的误差控制提供了可参考的理论数据。

Accurate positioning of underwater benchmark （transducer） is a key in a high precision positioning system, which influences ultimate quality of the acoustic positioning system. We make in-depth analysis of the positioning errors of the underwater benchmark due to cylinder deformation, positioning error of GPS, angular error of compass, and measurement error of the dynamic motion sensor. With reasonable assumption of the engineering data, we have obtained the result that the error of the underwater benchmark is a little more than 0.3 meter if the GPS error is less than 0.15 meter. The analysis provides useful data for reference of the error control in practical applications.