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1. EP0849890 - Satellite low orbital communication system with connection through earth gateway

Office European Patent Office
Application Number 97310320
Application Date 19.12.1997
Publication Number 0849890
Publication Date 24.06.1998
Publication Kind A3
IPC
H04B 7/185
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations
H04B 10/20
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
12Transmission through light guides, e.g. optical fibres
20Arrangements for networking, e.g. bus or star coupling
H04B 7/185
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations
H04B 7/195
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations
195Non-synchronous stations
H04B 7/216
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
204Multiple access
216Code-division or spread-spectrum multiple access
H04B 7/24
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
24for communication between two or more posts
CPC
H04B 7/18558
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations; ; Stations for satellite systems
1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
18558Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
H04B 7/18515
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations; ; Stations for satellite systems
1851Systems using a satellite or space-based relay
18515Transmission equipment in satellites or space-based relays
H04B 7/195
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations; ; Stations for satellite systems
195Non-synchronous stations
H04B 7/216
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
204Multiple access
216Code division or spread-spectrum multiple access
Applicants GLOBALSTAR LP
Inventors WIEDEMAN ROBERT A
Priority Data 08772073 19.12.1996 US
Title
(DE) Kommunikationssystem mit Satelliten mit niedriger Laufbahn und Schaltung durch irdische Zwischenstelle
(EN) Satellite low orbital communication system with connection through earth gateway
(FR) Système de communication par satellite à orbite basse avec connection à travers une interface terrestre
Abstract
(EN)
A communications system includes at least one low earth orbit first satellite (10), at least one second satellite (11) in other than a low earth orbit, and a ground segment (12) that includes a plurality of user transceivers (78, 80, 82, 84) and at least one gateway (76) coupled to a publicly-accessible terrestrial communications system, such as a PSTN and/or a fiber optic network. The first satellite includes a first transceiver for communication with the at least one gateway, a second transceiver for communication with at least one user transceiver, and a third transceiver for communication with the at least one second satellite. The first, second and third transceivers are switchably coupled together on-board the first satellite by on-board processors (36, 38, 56) and a switching matrix (70) for relaying a user communication between the at least one gateway (76) and the at least one user transceiver via the at least one second satellite. The plurality of user transceivers can include a plurality of data processors which are interconnected into a network through the at least one first satellite (10). This network can be considered as a virtual network, and can have a mesh, star, or other topology. In a presently preferred, but not limiting embodiment of this invention, the user transceivers are adapted to transmit and receive direct sequence, code division/multiple access communications. Transmission of signals to and from the user transceivers is accomplished by spreading a digital data stream (e.g., voice, data, image, video) with assigned spreading codes.

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