关于两物标方位定位问题

On the Fixing by Cross Bearings

分析了两方位定位的准确度、物标选择的要求等问题 ,并得出结论 :当两物标观测方位的差等于 90°时 ,观测船位的精度最高 ;选择定位物标时应从方位线的交角考虑 ,即交角等于 90°为最好 ,文献 [1～ 5 ]所述离物标的距离愈近愈好的结论并不是绝对正确的 ,从而纠正了在各种中外《航海学》

This paper analyzes the problems of precision in fixing position by cross bearings and requirements of selected objects for fixing. And it has come to the conclusion: If difference of bearings of two objects is 90°, the precision of observed position is the highest. When selecting objets for fixing, we have to think over the angle of intersection of bearing lines. So the conclusion in literature [1～5] that the shorter the distances between the objects the better, is proved incorrect. Thus we correct the mistakes in the course book “Navigation”.