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1. 发明授权

US6011515A System for measuring average speed and traffic volume on a roadway 失效
标题翻译：用于测量道路上的平均速度和交通量的系统
公开(公告)号：US6011515A
公开(公告)日：2000-01-04
申请号：US944798
申请日：1997-10-06
申请人： Scott T. Radcliffe , Eric D. Holm
发明人： Scott T. Radcliffe , Eric D. Holm
IPC分类号： G01P3/64 , G08G1/042 , G01S3/02
CPC分类号： G08G1/042 , G01P3/64
摘要： A vehicular traffic sensor capable of measuring traffic speed and volume in all weather conditions and at a low installed cost. The sensor makes use of multi-path interference of ambient radio frequency (RF) signals. The ambient RF signals can be, for example, control signals constantly transmitted by cellular telephone base stations. As vehicles travel along the roadway, they reflect RF signals in all directions. An antenna mounted near the side of the road will detect signals from the transmitter and signals reflected off the vehicle. Variations in the amplitude of the combination of the two signals can be processed using a method that allows the sensor to determine traffic speed and volume. This information can then be sent directly to a traffic management center. This provides an inexpensive sensor for wide-area traffic monitoring.
摘要翻译：一种能够在所有天气条件下以低安装成本测量交通速度和体积的车辆交通传感器。传感器利用环境射频（RF）信号的多径干扰。环境RF信号可以是例如由蜂窝电话基站不断发送的控制信号。当车辆沿着道路行驶时，它们会反射所有方向的射频信号。安装在道路旁边的天线将检测到发射机的信号和从车辆反射的信号。可以使用允许传感器确定交通速度和体积的方法来处理两个信号的组合的振幅的变化。该信息可以直接发送到交通管理中心。这为广域流量监控提供了便宜的传感器。

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