两方位定位时船位标准差问题  

On Standard Error of Fixing Position by Cross Bearings

作　　者：潘琪祥[1] 

机构地区：[1]上海海运学院商船学院,上海200135

出　　处：《上海海运学院学报》2003年第3期217-221,共5页Journal of Shanghai Maritime University

摘　　要：分析了两方位定位时船位标准差问题,并指出当观测船位位于被测物标连线的中垂线上,离被测物标连线的距离约为0.35d时,船位标准差有最小值0.92m_Bd,这时两物标的方位差约等于109°.5。同时建议:两方位定位时,物标的方位差应不小于50°,且不大于150°,区域“Q”是较为合理的两方位定位区域。在该区域内,船位标准差在(0.92～2.00)m_Bd。This paper analyzes the problems of standard error of ship's position in fixing by cross bearings, and get a conclusion: when the position is located in central and vertical line linking up the targets, and keeps at 0.35d , the standard error of ship's position is the least value. And this paper proposes that difference of bearings of two objects is no less then 50 and no bigger then 150in practice of fixing. At the same time it points out that the region 'Q' is reasonable for fixing by cross bearings. In 'Q' region the standard error of ship's position is (0.92~2)mBJ.

关 键 词：两方位定位 船位标准差 航位测定 航海学 观测 

分 类 号：U675.6[交通运输工程—船舶及航道工程]