マイクロ・プロセッサによる簡易型速度計

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タイトル別名
  • On the Low Cost Log Using Microprocessor
  • マイクロ プロセッサ ニヨル カンイガタ ソクドケイ

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抄録

A Microprocessor is very available in various fields, and authors have paid attention to the applications in navigational equipments. One navigational equipment was producted in order to examine the method of application: that was the low cost log. Listed below were several basic requirements to product the log for small boats and vessels. (i) It is easy to equip with regard to the cost and the size. (ii) It is necessary that no special sensor should be equipped under the bottom of boat. (iii) The relative error of speed is less than 0.5 knots on comparison with E.M. Log. (iv) It is easy to add another functions to this log. Under these basic requirements, the method of estimating speed from propeller revolutions was adopted. The speed was estimated from the propeller revolutions in basic, the slip ratio and manual correction. According to the results of experiments, authors could obtain that the low cost log could indicate the speed less than 0.5knots on comparison with E.M. Log in either monotonous state of speed or state of speed increasing with pertinent adjustment.

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