Abstract
Automatic Radar Plotting Aids (ARPA) is one of the instruments effective for safe navigation. ARPA information is caluculated using target's position (ARPA position) and own ship's course and speed. It is assumed that the fluctuation of ARPA position has an influence on the accuracy of ARPA information. So the authors have tackled this problem. In this report we show distance characteristic of ARPA position's fluctuation and performed a Monte-Carlo analysis to find the effect of 4 different target positions on the accuracy of ARPA information. The results are as follows. 1. The radar echo signals of T. S.FUKAE MARU were collected at the three distances of 2, 4 and 6 nautical mile. 2. The distance dependence of the fluctuation of the echo position was found at the 18 aspect angles from the 63 scan radar echo signal data of FUKAE MARU. 3. Monte-Carlo simulation was carried out for four IMO's scenarios and used to evaluate the effect of the distance of four ARPA positions on ARPA information.
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