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1. US20020132578 - Interactive fixed and mobile satellite network

Office United States of America
Application Number 10103070
Application Date 21.03.2002
Publication Number 20020132578
Publication Date 19.09.2002
Publication Kind A1
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 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 7/204
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
204Multiple access
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.
Agents PAUL D. GREELEY, ESQ. OHLANDT, GREELEY, RUGGIERO &; PERLE, L.L.P.
Title
(EN) Interactive fixed and mobile satellite network
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 and a switching matrix for relaying a user communication between the at least one gateway 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. 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.