中文摘要：

设计一款汽车主动防护的激光测距防碰撞系统。该系统利用激光探测前方路况,并通过单片机控制预警和防撞系统,帮助驾驶者对险情提前进行预判并采取相关措施（报警或者自动制动）。经仿真表明：该系统可以有效地减少汽车在公路上追尾碰撞等事故。

英文摘要：

A laser ranging anti-collision system which can be used in automobile system is designed. The system detects the road status in the distance by laser beam, and the Single-chip control the system to take early warning and anti-collision system. It can assist the driver to estimate the risk level and brake earlier in a dangerous condition. Example and simulation show that it can efficaciously reduce the automotive rear end collision.