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31. 发明授权

US4910793A Two-way transmission system for ground/mobile station communications 失效
标题翻译：用于地面/移动台通信的双向传输系统
公开(公告)号：US4910793A
公开(公告)日：1990-03-20
申请号：US130122
申请日：1987-12-08
申请人： Jacques Mainardi
发明人： Jacques Mainardi
IPC分类号： H04B7/26 , B61L3/12 , B61L3/22 , B61L3/24 , B61L23/22 , H04B5/00 , H04B7/00
CPC分类号： B61L3/227
摘要： Information is transmitted at microwave frequencies, the ground station being connected to a waveguide (25) and the station aboard a railway vehicle being connected to an antenna (26). Each station comprises a microwave generator (19) supplying a carrier, transmitters (3 through 7) supplying subcarriers, receivers (28 through 32) and a pilot generator (1). The carrier and subcarrier frequencies are multiples of the pilot frequency and the frequency difference between adjacent subcarriers equals the pilot frequency. A transmitter mixer (MTX) receives the carrier and the subcarriers and is connected to a circulator (24), itself linked to the waveguide (25) in the ground station and to the vehicle station antenna. A receiver mixer (MRX) is connected via a filter (23) to the circulator (24) and receives the carrier from the microwave generator; the latter mixer is connected to the receivers (28 through 32) to which it sends the subcarriers transmitted by the other station.
摘要翻译：信息以微波频率传输，地面站连接到波导（25），铁路车辆上的车站连接到天线（26）。每个站包括提供载波的微波发生器（19），提供子载波的发射机（3至7），接收机（28至32）和导频发生器（1）。载波和副载波频率是导频的倍数，相邻子载波之间的频差等于导频。发射机混合器（MTX）接收载波和子载波，并连接到本地连接到地面站中的波导（25）的循环器（24）和车站天线。接收机混合器（MRX）通过滤波器（23）连接到环行器（24），并从微波发生器接收载波; 后一个混频器连接到发送由另一个站发送的子载波的接收机（28至32）。

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