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1. 发明授权

EP0981913B1 SATELLITE APPARATUS WITH OMNIDIRECTIONAL AND MANUALLY STEERABLE DIRECTIONAL ANTENNA 失效
标题翻译：用圆RADIANT天线和单个应税报告卫星天线安排
公开(公告)号：EP0981913B1
公开(公告)日：2002-02-20
申请号：EP98920677.6
申请日：1998-05-13
申请人： Inmarsat Ltd.
发明人： BROUGHTON, John, William
IPC分类号： H04Q1/12 , H04B1/38 , H04B7/185
CPC分类号： H01Q1/241 , H01Q1/24 , H01Q1/38 , H01Q21/28
摘要： A mobile satellite communications terminal (2) comprises a portable computer (68), an interface card (8) containing intermediate frequency (IF) conversion circuitry (28, 52), and an antenna assembly (10) including RF conversion circuitry (34, 50) and an antenna (44). The interface card (8) is connected to the antenna assembly (10) by a detachable cable (32), which carries IF signals. This arrangement reduces RF power losses and interference. The antenna (44) is manually steerable towards a geostationary or quasi-geostationary satellite (12). A navigation signal antenna (56) is mounted on the antenna assembly (10) and is steerable independently of the antenna (44) so as to be vertically aligned, which is the optimum position for receiving navigation signals. The antenna assembly (10) includes orientation sensors (70, 75) which allow the difference between the current and the correct orientation of the antenna (44) to be calculated. This difference is indicated to the user to assist manual steering of the antenna (44).

2. 发明公开

EP0981913A2 SATELLITE APPARATUS WITH OMNIDIRECTIONAL AND MANUALLY STEERABLE DIRECTIONAL ANTENNA 失效
标题翻译：卫星电视台EINER RUNDSTRAHLENDEN ANTENNE UND EINER HANDSTEUERBAREN RICHTANTENNE
公开(公告)号：EP0981913A2
公开(公告)日：2000-03-01
申请号：EP98920677.6
申请日：1998-05-13
申请人： Inmarsat Ltd.
发明人： BROUGHTON, John, William
IPC分类号： H04Q1/12 , H04B1/38 , H04B7/185
CPC分类号： H01Q1/241 , H01Q1/24 , H01Q1/38 , H01Q21/28
摘要： A mobile satellite communications terminal (2) comprises a portable computer (68), an interface card (8) containing intermediate frequency (IF) conversion circuitry (28, 52), and an antenna assembly (10) including RF conversion circuitry (34, 50) and an antenna (44). The interface card (8) is connected to the antenna assembly (10) by a detachable cable (32), which carries IF signals. This arrangement reduces RF power losses and interference. The antenna (44) is manually steerable towards a geostationary or quasi-geostationary satellite (12). A navigation signal antenna (56) is mounted on the antenna assembly (10) and is steerable independently of the antenna (44) so as to be vertically aligned, which is the optimum position for receiving navigation signals. The antenna assembly (10) includes orientation sensors (70, 75) which allow the difference between the current and the correct orientation of the antenna (44) to be calculated. This difference is indicated to the user to assist manual steering of the antenna (44).
摘要翻译：移动卫星通信终端（2）包括便携式计算机（68），包含中频（IF）转换电路（28,52）的接口卡（8）和包括RF转换电路（34,52）的天线组件（10） 50）和天线（44）。接口卡（8）通过携带IF信号的可拆卸电缆（32）连接到天线组件（10）。这种布置降低了RF功率损耗和干扰。天线（44）可手动地引向对地静止卫星或准对地静止卫星（12）。导航信号天线（56）安装在天线组件（10）上，并且独立于天线（44）被引导以便垂直对齐，这是用于接收导航信号的最佳位置。天线组件（10）包括方位传感器（70,75），其允许计算天线（44）的电流和正确取向之间的差异。用户指示这种差异来辅助天线（44）的手动转向。

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