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    • 1. 发明申请
    • METHOD AND APPARATUS FOR DETERMINING DIRECTION
    • 用于确定方向的方法和装置
    • WO1995034101A1
    • 1995-12-14
    • PCT/GB1995001300
    • 1995-06-06
    • INTERNATIONAL MOBILE SATELLITE ORGANIZATIONFELDMAN, Howard, Ray
    • INTERNATIONAL MOBILE SATELLITE ORGANIZATION
    • H01Q01/12
    • G01C17/04G01C1/00H01Q1/125
    • A map is provided for indicating the direction of a fixed point (S), such as a sub-satellite point, from any point (P) within a specified area which is a substantial fraction of the earth's surface. The map projection is such that the actual direction to the fixed point (S) is the same as the direction shown on the map, when the map is aligned with a reference direction such as magnetic north. Optionally, the distance to the fixed point on the map represents the elevation of the satellite. Apparatus for using the map includes a holder (10) for the map and for a magnetic compass (18). A scale (22) which rotates about the fixed point on the map has a marker (32) which is positioned over the user's location on the map. The azimuthal direction of the satellite is indicated by an arrow (28) on the scale, while the elevation of the satellite is read off the scale by means of a pointer (34) located on the fixed point on the map.
    • 提供了用于从指定区域内的任何点(P)指示诸如子卫星点的固定点(S)的方向的地图,该点在地球表面的相当大的一部分中。 地图投影使得当地图与诸如磁北的参考方向对准时,到固定点(S)的实际方向与图上所示的方向相同。 可选地,到地图上固定点的距离表示卫星的高度。 用于使用地图的装置包括用于地图和磁罗盘(18)的保持器(10)。 围绕地图上的固定点旋转的刻度(22)具有位于地图上用户位置之上的标记(32)。 卫星的方位方向由刻度上的箭头(28)表示,而卫星的仰角通过位于地图上的固定点上的指针(34)从比例尺读出。
    • 2. 发明申请
    • COMMUNICATION METHOD AND APPARATUS USING DATA COMPRESSION
    • 使用数据压缩的通信方法和设备
    • WO1997000561A1
    • 1997-01-03
    • PCT/GB1996001415
    • 1996-06-14
    • INTERNATIONAL MOBILE SATELLITE ORGANIZATIONOBRADORS, JoanFELDMAN, Howard, RayREMAEL, François-Arnaud
    • INTERNATIONAL MOBILE SATELLITE ORGANIZATION
    • H04B07/185
    • H04B7/18528
    • A communications link for data communication via satellite includes interface apparatus (12) comprising a satellite link interface (20) for connection to a satellite link and a PSTN interface (22) for connection to a PSTN (14). The interface apparatus (12) supports different data compression modes in the communications link. Mode A allows data compression over the PSTN (14) but not over the satellite link. Mode B allows data compression over the PSTN (14) and over the satellite link, but enables decompression and recompression of data flowing in each direction through the interface apparatus (12). Mode C allows compressed data to pass transparently between the PSTN (14) and the satellite link, while the interface apparatus performs error correction on the satellite link and on the PSTN (14).
    • 用于通过卫星进行数据通信的通信链路包括接口设备(12),包括用于连接到卫星链路的卫星链路接口(20)和用于连接到PSTN(14)的PSTN接口(22)。 接口装置(12)在通信链路中支持不同的数据压缩模式。 模式A允许通过PSTN(14)进行数据压缩,但不能通过卫星链路进行数据压缩。 模式B允许通过PSTN(14)和卫星链路上的数据压缩,但是能够通过接口设备(12)对在每个方向上流动的数据进行解压缩和重新压缩。 模式C允许压缩数据在PSTN(14)和卫星链路之间透明地通过,而接口装置在卫星链路和PSTN(14)上执行纠错。