| 摘要 |
<p>PURPOSE:To detect the distance and relative velocity to a detected object with accuracy even in the case of the detected object being in far distance and the receive signal level being in the low state, and cope rapidly with the situation such as interruption. CONSTITUTION:Reflected wave from a detected object is received by an receiving antenna 20 and combined with a part of a transmission signal in a mixer 22 so as to generate a beat signal. The beat signal is converted into a pulse signal in a waveform shaper 28 and subjected to signal processing in a distance- relative speed computing element 32, and distance data and relative velocity data are supplied to an averaging processor 34. Part of a receive signal is supplied to a receive signal level detector 36 and a receive signal level differentiating circuit 38, and the number of sampling for averaging in the averaging processor 34 is increase-decrease adjusted according to the receive signal level and its change rate.</p> |
