Use of ultrasonic distance measurement principle, due to low cost, high accuracy, proposed one kind based on the AT89S52ultrasonic reversing radar of the system design.
利用超声波测距原理，出于低成本、高精度的目的，提出了一种基于AT 89s52的超声波倒车雷达系统的设计方案。
The basic principle of the linear frequency modulation absolute distance interferometric plan and the problems existed in beating frequency measurement are described.
论述了线性调频绝对距离干涉测量方案的基本原理以及拍频测量中存在的问题；
This paper can solve the key difficulty of lane detection, car detection and distance measurement based on central perspective principle and image process in order to alarm rear-end collision.
本文利用中心透视原理和图像处理的方法可以解决车道识别，车辆识别和车间距测量的关键难点，达到高速公路汽车追尾预警的目的。
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