说明：  提供了一个基于prescan场景做的FCW逻辑算法，是用simulink搭建的，用MATLAB 做的GUI，可以实时显示出车辆在运行时的一些结果值，包括distance、TTC、vehicleSpeed等
(This paper provides a FCW logic algorithm based on prescan scenario, which is built by Simulink and GUI made by MATLAB. It can display some results of vehicle running in real time, including distance, TTC, vehicleSpeed and so on.)