| 摘要 |
PURPOSE:To improve the detection capability of a sonar by furnishing the sonar with an ability to indicate simultaneously on the surface of one cathode-ray tube the horizontal distance to an object in the sea-water and the position thereof in a perpendicular section of the sea-water. CONSTITUTION:A pulse is generated every one spiral sweep by utilizing as a synchronizing signal an output from a sweep signal generating circuit 2. A gate circuit 25 is opened to allow a holding voltage of a holding circuit 22 to flow therethrough by the pulse width. When this is applied to a cathode-ray tube 12, the distance to a shoal of fish at an angle of depression, i.e. a perpendicular section of the sea- water can be displayed. A pulse P9 is then generated every one spiral sweep, and the gate circuit 25 is opened by the time width of the pulse P9. As a result, a pulse width in proportion to the holding voltage of the holding circuit 22 can be obtained. This pulse is applied to a cathode-ray tube 12 to convert the intensity of an echo signal from the shoal of fish into the length of a bright line and thereby indicate the distance thereto. |
