| 摘要 |
<p>PURPOSE:To enable relative distances to be constantly accurately detected to improve the function of vehicle safety devices such as collision avoidance devices by switching the magnitude of the output of transmitting signals in response to a relative distance to a target and its circumstance. CONSTITUTION:Based on various pieces of information including relative distance information obtained at an operation part 20, the number of transmitters to be driven is determined at a transmissions determination circuit 15. A switching circuit 14 is used to supply coding pulse signals generated at a coding pulse generator 16 to drive circuits 13a to 13n corresponding to the number of transmissions to drive the corresponding transmitters 11a to 11n.</p> |
