| 摘要 |
<p>PURPOSE:To take an accurate measurement by differentiating the demodulated signal of a reflected wave which is received, and displaying an echo image corresponding to the demodulated signal which is differentiated on a display device. CONSTITUTION:A trigger pulse which is generated by a trigger circuit 10 is sent into the ground through a transmitting circuit 11 and an antenna 12 and reflected by a target, and its echo is received 14 through a receiving antenna 13. This received signal is amplified 15, and converted 20 into a specific low frequency signal, which is inputted to and differentiated by a differentiating circuit 30. Then the received signal which is differentiated is converted 31 into a digital signal and applied to a display memory write control circuit 70. A trigger signal from the circuit 10 is converted 20 to low frequency and applied to the circuit 70 through a vertical synchronizing signal generating circuit 40. Further, a range finder measurement signal from a distance sensor 50 is applied to the circuit 70 through a horizontal synchronizing signal generating circuit 60. Then the circuit 70 converts coordinate values obtained corresponding to the horizontal and vertical synchronizing signals into address values of a display memory 71 successively and a display signal generating circuit 80 generates a display signal for a monitor TV, etc.</p> |
