Hughes Aircraft Company

Hughes Electronics Corporation

Gregory C Busche

Harold A Rosen

Parthasarathy Ramanujam

Victor S Reinhardt

Andrew L Strodtbeck

Jennifer L Vollbrecht

Armando Montalvo

Henry V Bazak, Jr

Pauline C Bennett

Samuel Prum

A navigation and mobile communication satellite system including a Geo-Mobile (GEM) satellite (,) and a plurality of Global Position System (GPS) satellites (,). The GEM satellite (,) is in operative communication with at least one ground segment (,) and at least one user segment (,), and includes a GEM processor for providing communication services to the user segments (,). The GPS network is also in operative communication with at least one of the user segments (,) and at least one of the ground segments (,). The GPS network provides navigation data to the user segment (,). Each of the ground segments (,) include a gateway station (,) for receiving the navigation data and uplinking the navigation data to the GEM satellite (,) such that the navigation data is rebroadcast to the user segments (,) at a higher power than from the GPS network alone. In this manner, the GEM system provides a navigation signal at a much higher power than the present GPS system. This signal is of sufficient strength to overcome the effects of a lower power signal jammer, which may be effective against the weaker GPS signal.

Combined navigation and mobile communication satellite architecture

A satellite-based communication system providing high rate transfer of data between linked terminals. The system comprises a plurality of user terminals (VSAT's) that are linked by and that communicate with each other by way of a satellite-based relay system. A network control center provides configuration signals that control the satellite relay system and coordinate linking of terminals to each other. Frequency division multiplexing uplinks are used from the terminals and the network control center to the satellite relay system. Time division multiplexing are used on downlinks from the satellite relay system to the terminals and the network control center. Each user terminal comprises a data compression and decompression circuit, a transceiver, and an antenna for transmitting and receiving data to and from the satellite relay system. The satellite relay system comprises a satellite, a wide area antenna, a plurality of receive antennas, a plurality of transmit antennas, and a signal processor. The wide area antenna is provided for communicating control signals between the user terminals and the network control center. The plurality of receive antennas operate in a first frequency band and produce a first plurality of beams that cover a service area. The plurality of receive antennas receive time domain modulated data from the user terminals. The plurality of transmit antennas operate in a second frequency band and produce a second plurality of beams that cover the service area. The plurality of transmit antennas transmit frequency domain modulated data to the user terminals. The signal processor demodulates the time domain modulated data received from a user terminal, routes the demodulated data so that it is transmitted to a second user terminal, remodulates the data to provide frequency domain modulated data, and transmits the frequency domain modulated data to the second user terminal. Video cameras and monitors are coupled to the user terminals to provide for video teleconferencing.

High data rate satellite communication system

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Manhattan Beach, CA, United States of America

Gregory C Busche