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中文摘要：
分析了传统的航迹计算法存在的缺陷,为提高航迹计算精度,给出基于地球椭球模型的改进的墨卡托航法;从中分纬度的几何定义出发,导出地球椭球体上改进的中分纬度公式,在此基础上给出改进的中分纬度航法。本文所给算法公式均为符号形式,可以解决航海中不同参考椭球下的航迹精确计算问题。
英文摘要：
The deficiencies of the traditional track calculation methods were analyzed in this paper.In order to improve the accuracy of track calculation,the modified Mercator sailing method was given based on the ellipsoidal model.The calculating formula of middle latitude was derived from its geometrical definition based on an elliptical earth,and the modified middle latitude sailing method was also available.The two methods are both symbolic expressions,so they could solve the problem of accurate track calculation when different reference ellipsoids are used,and thereby provide a theoretical model for the development of accurate automatic navigation.
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