| 摘要 |
<p>PURPOSE:To provide a working machine in a configuration which positively enables monitoring of a body to be monitored over a wide range. CONSTITUTION:The title machine is provided with a first antenna 3b for transmitting a propagating wave in nearly horizontal first direction, a second antenna 3a for transmitting the propagating wave in a second direction which is nearly equal to the first direction, and a switching circuit 2 for switching a transmission antenna so that a propagating wave can be transmitted from an antenna which is selected out of the first antenna 3b and the second antenna 3a and then the spread for vertical directivity of the second antenna 3a is smaller than that of the first antenna 3b. Then, the transmission antennas are switched depending on the distance to a body to be monitored.</p> |
