声速误差对圆走航水下控制点定位影响分析

Analysis of the Influence of Sound Velocity Error on Sailing-Circle Positioning Method for Seafloor Control Points

针对圆走航定位声速剖面测量不准确引起水下控制点坐标解算存在偏差的问题,首先介绍了声速不确定性对测距误差的影响,并将声速测距误差分成背景声速剖面误差、随机误差、测距误差长周期项和测距误差短周期项,再通过分析坐标改正数方程得到不同声速测距误差项对控制点坐标定位的影响。最后,设计2组仿真实验对该理论进行验证,实验结果与理论推导的结论一致。

This paper focuses on the problem of deviation of seafloor control point coordinate solution caused by inaccurate measurement of sound velocity profile when using the sailing-circle positioning method.First,the effect of uncertainty in sound velocity on the ranging error are introduced.Then,the ranging error is divided into four parts:background sound velocity error,ranging random error,long-period term and short-period term of ranging error.The influence of these four parts on the control point coordinates are shown through analyzing the coordinate correction equation.The theoretical results are consistent with the simulation experiments.