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2. 发明授权

US5835057A Mobile satellite communication system including a dual-frequency, low-profile, self-steering antenna assembly 失效
标题翻译：移动卫星通信系统包括双频，低调，自转天线组件
公开(公告)号：US5835057A
公开(公告)日：1998-11-10
申请号：US792932
申请日：1997-01-22
申请人： Martin Kits van Heyningen
发明人： Martin Kits van Heyningen
IPC分类号： H01Q1/32 , H01Q3/08 , H01Q5/00 , H01Q5/40 , H01Q5/50 , H01Q5/55 , H01Q15/00 , H01Q19/10 , H01Q19/13 , H01Q21/06 , H04B7/185 , H01Q3/00
CPC分类号： H04B7/18571 , H01Q1/3216 , H01Q15/0006 , H01Q19/10 , H01Q19/132 , H01Q21/065 , H01Q3/08 , H01Q5/40 , H01Q5/50 , H01Q5/55
摘要： A mobile satellite communication system includes an antenna assembly mountable on a vehicle and a satellite tracking assembly. The antenna assembly includes an antenna device for receiving first satellite signals from a first satellite in a first frequency band and for transmitting and receiving second satellite signals to and from a second satellite in a second frequency band, and a drive subassembly for rotating the antenna device relative to the vehicle in response to a control signal. The satellite tracking assembly maintains the antenna device pointed at the first and second satellites as the vehicle moves. The system further includes a receiver coupled to the antenna device for receiving the first satellite signals and a transceiver coupled to the antenna device for transmitting and receiving the second satellite signals. The first satellite signals may be video and imagery data signals transmitted in the Ku band by a direct broadcast satellite. The second satellite signals may be two-way digital communication signals transmitted and received in the L band by an AMSC satellite.
摘要翻译：移动卫星通信系统包括可安装在车辆上的天线组件和卫星跟踪组件。天线组件包括天线装置，用于从第一频带中的第一卫星接收第一卫星信号，并用于在第二频带中向第二卫星发射和接收第二卫星信号;以及驱动子组件，用于旋转天线装置响应于控制信号而相对于车辆。当车辆移动时，卫星跟踪组件将天线装置维持在第一和第二卫星上。所述系统还包括耦合到所述天线装置的用于接收所述第一卫星信号的接收机和耦合到所述天线装置的用于发射和接收所述第二卫星信号的收发器。第一卫星信号可以是通过直接广播卫星在Ku频带中发送的视频和图像数据信号。第二卫星信号可以是由AMSC卫星在L频带中发送和接收的双向数字通信信号。

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