| 摘要 |
PURPOSE:To enable beams to match with a target portion by a method wherein emission and receipt of ultraviolet beams for a Doppler are effected by using a vibrator group for a fault mode, and the position and the direction of beams for a Doppler are variable through selective control of a drive element and a delay amount. CONSTITUTION:During a Doppler mode, by moving a track ball on a key board 21, Doppler beams shown by a dotted line is moved on a mode B. Namely, by moving the track ball, a control signal is outputted to a drive element selecting circuit 4 from a control circuit 20, and a drive element responding to a command by the track ball. For example, beams for a Doppler located in a position B1 is moved to a position B2 through rightward movement of the track ball, and through further rightward movement of the track ball, the direction of beams is varied to a direction shown by B3. When the track ball is further moved rightward, the position and the direction of beams are varied in order of B4, B1, B2, and B3. |
