公开(公告)号：US4030088A

公开(公告)日：1977-06-14

申请号：US516656

申请日：1974-10-21

申请人： David Jacob McCullough

发明人： David Jacob McCullough

IPC分类号： B66C15/04 ,  G01S11/02 ,  G01S19/48 ,  G08G9/02 ,  G08B21/00

CPC分类号： B66C15/045 ,  G01S11/02 ,  G08G9/02

摘要： A position detecting and control system for a vehicle includes a low frequency transmitter and associated antenna and a receiver and associated antenna, one of the antennas being mounted on the vehicle so the distance between the antenna carried by the vehicle and the other antenna is determined by the amplitude of the signal induced in the receiving antenna. The frequency of the transmitter is such that the distances to be monitored are a small fraction of the wavelength of the frequency involved, and any significant signal variations due to signal reflections which can reinforce or cancel the received signal are avoided. The system monitors at least two different spacings between the transmitting and receiving antennas where the signals received at the receiving antenna are of widely different orders of magnitude. Separate range detecting circuits are coupled to a common point of the receiver, each of which includes an attenuator at the input thereof for adjusting the level of the signal to be fed to an associated signal level detector which operates a control device when the signal at the receiver output point involved reaches a level indicating the associated spacing to be monitored.

摘要翻译： 一种用于车辆的位置检测和控制系统包括低频发射器和相关联的天线以及接收器和相关联的天线，其中一个天线安装在车辆上，使得由车辆携带的天线和另一个天线之间的距离由 在接收天线中感应信号的幅度。 发射机的频率使得要监测的距离是所涉及频率的波长的一小部分，并且避免了由于可以加强或消除接收信号的信号反射引起的任何显着的信号变化。 该系统监测发射天线和接收天线之间至少两个不同的间距，其中在接收天线处接收的信号的幅度差别很大。 单独的范围检测电路耦合到接收机的公共点，每个接收机的输入端包括衰减器，用于调节要馈送到相关联的信号电平检测器的信号的电平，该信号电平检测器操作控制装置，当信号处于 所涉及的接收机输出点达到指示要监视的相关间距的电平。