船舶航迹标绘仪中的海图坐标投影及误差分析

Chart Projection Algorithm and Error Analysis for Ship Track Plotter

船舶航迹标绘仪取代了人工海图标绘作业,提高了舰船作业的自动化和信息化程度。由于海图坐标投影算法影响了航迹标绘仪的绘图精度,通过对墨卡托海图坐标正算过程产生的误差在理论上进行的分析,推导了两点间经、纬度差的极限公式,在仿真实验中提出了经、纬度分段计算方法。通过对算法的改进,大大提高了航迹标绘作业的精度。

Track plotter has replaced manual chart plotting operation and improved the extent of ship automation and information. The errors from machine and algorithm will influence plotting precision of track plotter. The detailed mapping process of track plotter is explained in the paper and the algorithm of charts coordinates projection is illuminated. The errors in the conversion process of charts coordinates are analyzed theoretically, the limitation formula of longitude and latitude differences between two points are deduced. In simulation experiments subsection plotting method is presented. In this way the precision of track plotting operation is increased greatly by the improvement of software algorithms.