公开(公告)号：US3868575A

公开(公告)日：1975-02-25

申请号：US36373073

申请日：1973-05-24

Applicant: THOMSON CSF

Inventor： NARBAITS-JAUREGUY JEAN RAYMOND ,  BILLOTTET HENRI

IPC: G08G1/09 ,  G08C19/12 ,  H04B5/00 ,  H04B5/06 ,  H04B7/26 ,  H04B1/00

CPC classification number: H04B5/06

Abstract: Vehicles traveling along a predetermined route are equipped with mobile receivers picking up traffic information from a radiating transmission line extending along the route, this information being modulated upon a first carrier F1 for vehicles traveling in one direction and upon a second carrier F2 for vehicles traveling in the opposite direction. Two ancillary short-range transmission stations, located at opposite ends of the line, radiate amplitude-modulated carrier waves directly to vehicles in the vicinity thereof whose receivers are tuned to either of the two carriers F1, F2. The first ancillary station emits the two carriers both modulated with a low-frequency signal f1 whereas the second ancillary station emits the same carriers modulated with a different low-frequency signal f2. A discriminating circuit aboard each vehicle, upon the reception of an amplitudemodulated carrier, tunes the receiver thereof either to the carrier F1 in response to a detected signal f1 or to the carrier F2 in response to a detected signal f2.

Abstract translation: 沿着预定路线行驶的车辆配备有从沿着路线延伸的辐射传输线拾取交通信息的移动接收机，该信息被调制在用于在一个方向上行进的车辆的第一行星架F1上，并且在第二行星架F2上行驶 相反的方向。 位于线路两端的两个辅助短距离发射站将幅度调制的载波直接辐射到其接收机调谐到两个载波F1，F2中的任一个的附近的车辆。 第一辅助站发射两个用低频信号f1进行调制的载波，而第二辅助站发射用不同的低频信号f2调制的相同载波。 每个车辆上的识别电路在接收到幅度调制载波时，响应于检测到的信号f1或者响应于检测到的信号f2而将其接收机调谐到载波F1。