【摘要】 为了克服因极区地理经线快速收敛而产生的惯导系统无法准确定位的难题,对极区格网导航在大圆航行中的应用进行了研究,提出将过大圆顶点的子午线作为格网北的极区格网导航方法,根据格网北进行了航向推算,分别对大圆顶点相对于大圆端点对称的特殊情况以及大圆顶点相对于大圆端点非对称的常规情况进行了航向推算,并分析了航向误差产生的原因。理论分析证明该方法能够为船舶高纬度航行提供准确的位置信息。更多还原

【Abstract】 The convergence of geographic meridians at the Arctic Ocean makes steering and positioning extremely difficult when utilizing conventional inertial navigation system. The polar grid navigation method adopted in great-circle sailing is discussed to cope with above problems. The polar grid navigation method which takes the meridian through the vertex of the great circle as the reference meridian is presented. Heading reckoning is studied with reference to the grid north. Heading reckoning is also studied in consideration of the event that the two points of great circle lie symmetrically and non-symmetrically to the vertex. The reason of course error is expounded. Theory analysis indicates that the method in this paper can provide the accurate position information for ship navigation in high latitude.更多还原