| 摘要 |
PURPOSE:To recognize a static obstacle existing in the advance direction by judging the existence based on the period when the spectrum peaks of a stationary body are continuously kept at a high-intensity level. CONSTITUTION:A stationary body spectrum detecting means 3 extracts peaks caused by a stationary body from the beat spectrum detected by an FM-CW radar 1 based on the speed of a vehicle detected by a vehicle speed sensor 2. When a stationary obstacle exists in the advance direction of the vehicle, peaks continuously kept at a relatively high-intensity level are extracted. When the radar 1 receives the reflected wave caused by the stationary obstacle on a roadside zone, the intensity of the reflected wave is fluctuated along with the advance of the vehicle because the vehicle does not face the obstacle. A stationary body judging means 5 judges the peaks continuously detected at a high-intensity level by a level measuring means 4 as an obstacle existing in the advance direction of the vehicle, and it judges the peaks discontinuously detected at a high-intensity level as a stationary obstacle existing not in the advance direction. |
