| 摘要 |
PURPOSE:To obtain a ship speed approximating an actual ship speed by correcting a last log ship speed which is obtained by the Doppler speed log system before accuracy deterioration as the shift speed of a ship body. CONSTITUTION:A comparative arithmetic module 12 compares a wave coefficient W outputted by a fixed data storage module 10 with a work coefficient W0 outputted by a wake coefficient arithmetic module 11 and outputs a current log ship speed V0 which is outputted from a computing element 2b for a Doppler speed log to a display device 4 when W-epsilon<=W0+epsilon. When W0<W-epsilon or when W0>W+epsilon, it is judged that the Doppler speed log is abnormal and the comparative arithmetic module 12 outputs a buffer data display command signal to a log ship speed storage buffer 13. Then the latest log ship speed data stored in the buffer 13 is outputted on the display board 4 as the log ship speed V1. |
