レーダー航法における最も近づく距離の変化について(日本航海学会第25回講演会)

抄録

The author has investigated how the nearest approach changes when own vessel alters her course and speed. When the target vessel is comming down afor the beam, the ratio of the initial nearest approach to that after the alteration of own vessel is given by following formula.[numerical formula] Where m=the ratio of the nearest approach. ΔC=the amount of course alteration. r_1=the ratio of the initial nearest approach to the distance between the two ships. k=the coefficient due to the speed ratio. The value of m is shown in the table 2. The relation between factors to double or treble the nearest approach is shown in the table 3, 4, fig.3, fig.4 and fig.5. When own vessel changes her speed, m is less than the value which is shown in the table 2, so we must change the speed with a large margin, and its rough estimate is shown in the table 6 and 7.