超声波测距导盲车关键技术的研究

Research on the key technology of ultrasonic distance measuring guidance.

摘要:

为了确保盲人或者视觉受损人群独自安全出行、真正解决其出行不便的困难,设计一款成本低廉、精度高,能够得到广泛推广使用的盲人辅助产品是很有必要的。通过分析提高测距精度和减小盲区的方法,设计了导盲车系统。系统由超声波测距和语音播报两部分组成。通过旋转云台搭载超声波探头检测障碍物距离和方位以及路面凹坑,车底前方的电极检测路面积水；由STM32微处理器对各信号进行处理。采用较高的时钟频率来提高测距精度,增加温度传感器补偿进一步保证精度；安装多个探头以及使用旋转云台,通过旋转扫描以减小盲区,再由文字转语音芯片SYN6288播报路况信息。由于采用旋转扫描检测,经过设计实物并测试,基本上能够覆盖前方约 、5-300cm扇形区域。测距分辨率可达到1cm。

Abstract:

s: In order to ensure that the blind or the visually impaired people travel independently and solve the difficulty of traveling, it is necessary to design a blind auxiliary product with low cost and high precision, which can be widely used. Analyzed the methods of improving the range precision and reducing the dead zone, the blind guide vehicle system is designed. The system consists of ultrasonic ranging and voice broadcast. The ultrasonic probe is used to detect the obstacle distance and azimuth as well as the road pits. The electrodes in front of the vehicle detect the road surface water and processing signals by STM32 microprocessor. Using a higher clock frequency to improve the ranging accuracy, with the temperature sensor for temperature compensation to further ensure accuracy; through the installation of multiple probes and pan and tilt to reduce the rotation of the blind spot, and then broadcast traffic information prompt the user by the text-to-speech chip SYN6288 and its external circuit. Through the design and testing, as a result of the rotation scan detection, can basically cover the front, 5-400cm fan-shaped area. Ranging resolution of distance detection up to 1cm.