公开(公告)号：US3760278A

公开(公告)日：1973-09-18

申请号：US3760278D

申请日：1971-12-15

Applicant: THOMSON CSF

Inventor： NARBAITS JAUREGUY J ,  BILLOTTET H

IPC: G08G1/09 ,  G08G1/0967 ,  H04B5/00 ,  H04H20/55 ,  H04H20/61 ,  H04B1/00

CPC classification number: G08G1/096716 ,  G08G1/094 ,  G08G1/096758 ,  G08G1/096775 ,  G08G1/096783 ,  H04B5/0018 ,  H04B5/06 ,  H04H20/55 ,  H04H20/61 ,  Y02D70/00 ,  Y02D70/42

Abstract: A fixed control station in a zone of high traffic density exchanges information with mobile stations aboard vehicles within that zone by short-range radiocommunication. The control station has an antenna in the form of a coaxial cable, with leakage losses, terminated by a dissipative load at one end while its other end is coupled to a transmitter supplying it with a frequency-modulated outgoing carrier destined for the vehicles within range. The outer conductor of the cable is grounded, at its end proximal to the load, through a parallel-resonant network tuned to the frequency of an incoming carrier from transmitterequipped vehicles; the other end of this conductor, remote from the load, is grounded through a similarly tuned circuit whose inductive branch forms the primary of a transformer coupling it to an associated receiver. A vehicle equipped with a car radio may have switchover means for selectively listening in on a radio program or on traffic information from the control station; a monitoring relay may respond to such traffic information to reverse a switch normally positioned for radio reception.

Abstract translation: 高交通密度区的固定控制站通过短距离无线电通信与该区域内的车辆上的移动台交换信息。 控制站具有同轴电缆形式的天线，其泄漏损耗由一端的耗散负载终止，而另一端耦合到向其提供预定用于车辆范围内的调频输出载波的发射机 。 电缆的外导体在靠近负载的端部通过并联谐振网络接地，调谐到来自发射机的车辆的进入载波的频率; 该导体的远离负载的另一端通过类似调谐的电路接地，其电感分支形成将其耦合到相关接收器的变压器的主要部分。 配备有汽车收音机的车辆可以具有用于选择性地收听无线电节目或来自控制站的交通信息的切换装置; 监控中继器可以响应这种业务信息来反转正常定位用于无线电接收的交换机。