| 摘要 |
<p>PURPOSE:To alter an S/N ratio. CONSTITUTION:In an underground radar, a reflected wave is converted to a low speed signal (signal extended in time axis) and the low speed signal is converted to a digital signal by and A/D converter 21 and the digital low speed signal at every reference pulse is cumulated and added at every sampling points (in this example, the number of sampling points; 4096) by an adder 32 and a buffer memory 33. This cumulated and added value is latched at every reference pulse by a latch circuit 35. The buffer memory 33 is cleared by the data obtaining pulse at each time when an antenna is moved by a predetermined distance and the content of the latch circuit 35 is divided by the cumulative addition frequency (n) to be outputted as one low speed signal and this signal is used in display or recording.</p> |
