交差方位法,三点両角法による測定船位の精度分布-II

概要

論文の詳細を見る
As the accuracy of a ship's position fixed by the cross bearing or the horizontal sextant angle method is determined by way of functions of distances and intersecting angles, in most cases, the closer one stands near any object the better he can get a highly accurate position, and on the contrary the farther away from it the poorer the accuracy he can obtain. The extent of inadequate accuracy is subject to the relation between three objects and the observation point, therefore it is not easy to know the entire aspect of the problem. In a former paper, the author calculated the probability densities of every point, and drew accuracy contours of the ship's positions, when the distance between A and B equals the distance between A and C. In this paper, he draws accuracy contours of the ship's positions, when the ratio of the distance between A and C to the distance between A and B is 2:1 (Fig.1 and Fig.3) The process of map drawing is troublesome, but if one examines those maps and the former ones closely, he can obtain the main point of these papers.
社団法人日本航海学会の論文
1973-12-30