| 摘要 |
PURPOSE:To decide the kind of fishes by displaying its water temperature together with a display of a sudden variation layer (the junction line between two ocean currents) of the water temperature. CONSTITUTION:A reflected wave from an ultrasonic wave transmitter receiver 1 is passed through an amplifying and detecting circuit 2 and a signal of the junction line between two ocean currents is extracted 3, A/D-converted 4, and inputted to RAM5. Further, a clock pulse generating circuit 8 sends a pulse train as a reference of the sampling, etc., of said signal and both output counted values of an X counter 9 and an Y counter 10 are inputted to the RAM5 through a changeover switch 11. Further, a clock pulse generating circuit 12 sends out a reference pulse train for determining a scanning speed, etc., for displaying and both output counted values of an X counter 13 and a Y counter 14 are led to the RAM5 through the switch 11. Data obtained from water temperature and depth sensors 17 and 18, on the other hand, are sent to a computer 19, which sends a signal for displaying the water temperature in a RAM20. Then, the junction line signal from the RAM5 and the water temperature signal from the RAM20 are passed through a D/A converter 6 and then displayed 7. |
