公开(公告)号：US4445118A

公开(公告)日：1984-04-24

申请号：US266253

申请日：1981-05-22

申请人： Ralph E. Taylor ,  James W. Sennott

发明人： Ralph E. Taylor ,  James W. Sennott

IPC分类号： G01S1/00 ,  G01S5/00 ,  G01S19/02 ,  H04B7/185

CPC分类号： G01S19/05 ,  G01S5/0027 ,  G01S5/0036

摘要： In a global positioning system (GPS), such as the NAVSTAR/GPS system, wherein the position coordinates of user terminals (14) are obtained by processing multiple signals transmitted by a constellation of orbiting satellites (16), an acquisition-aiding signal generated by an earth-based control station (12) is relayed to user terminals via a geostationary satellite (10) to simplify user equipment. The aiding signal is FSK modulated on a reference channel slightly offset from the standard GPS channel. The aiding signal identifies satellites in view having best geometry and includes Doppler prediction data as well as GPS satellite coordinates and identification data associated with user terminals within an area being served by the control station (12) and relay satellite (10). The aiding signal significantly reduces user equipment by simplifying spread spectrum signal demodulation and reducing data processing functions previously carried out at the user terminals (14).

摘要翻译： 在诸如NAVSTAR / GPS系统的全球定位系统（GPS）中，其中通过处理由轨道卫星（16）的星座发送的多个信号来获得用户终端（14）的位置坐标，生成获取辅助信号 由地球控制站（12）通过对地静止卫星（10）中继到用户终端，以简化用户设备。 辅助信号在与标准GPS通道略微偏移的参考通道上进行FSK调制。 辅助信号识别具有最佳几何形状的卫星，并且包括多普勒预测数据以及与由控制站（12）和中继卫星（10）服务的区域内的用户终端相关联的GPS卫星坐标和识别数据。 辅助信号通过简化扩频信号解调并减少先前在用户终端（14）执行的数据处理功能，大大降低了用户设备。