基于Cortex-M3的TFT屏在车距信号采集系统中的应用

Application of Signal Acquisition System in Auto Distance Based on the Cortex-M3 with TFT Screen

探讨了一种基于Cortex-M3内核芯片的TFT屏显示汽车距离的系统,论述了系统的工作原理、硬件结构和软件流程,以毫米波FMCW调频连续波雷达作为数据的收发模块并通过DSP对数据进行准确有效的处理。可以检测前方目标的距离并实时显示到TFT屏上且会有三个参考图片来直观的表示距离在动态变化,当超过设定的安全值时可以及时起到提醒驾驶员的作用,降低交通事故的发生率。

To discuss a system based on Cortex-M3 kernel chip with TFT for displaying distance between two moved cars, the paper expounds the system work principle, the hardware structure and software process and the millimeter wave FMCW FM continuous wave radar was used to transceiver data.Then data was treated accurately and effectively through the DSP.The system can detect the distance from front target cars and the distance displaying is real-time in the TFT.AIso, it display three reference pictures in the TFT for telling driver the car is getting closer or further to the front obstacle.When the distance exceed secure value, the system can help drivers to know road condition and deal with situation timely.So it can reduce the incidence of traffic accidents.