Hughes Network Systems, LLC

Bahman Salamat

Guy Bryan Montgomery

Jack Lundstedt

John Alfred Schmid

Yezdi F Antia

David Alan Roos

Murali Regunathan

George Eapen

Yeqing Tang

Brian Smith

An apparatus for defining and generating boundaries of satellite coverage. The apparatus includes a processor that is configured to select a plurality of beam points, from a set of points on a coordinate system, to be included within a beam definition, and determine a number of ellipses capable of enclosing the selected beam points while excluding all remaining points of the set of points. The processor then assigns the selected beam points to a corresponding ellipse, and optimizes geometric information for each ellipse to enclose the beam points assigned thereto. A coverage beam is then defined based on a contour resulting from the combined shape of all the ellipses using the optimized geometric information.

Apparatus and method for generating boundaries of satellite coverage beams

Power spectral density in an aeronautical satellite communication system is controlled through the use of adaptive inroute selection and spreading. Once a communication session has been established between the aircraft and the satellite, environmental conditions and aircraft conditions are monitored to detect events capable of affecting transmit/receive properties during the communication session. A maximum allowable transmission output is determined based, at least in part, on governmental regulations and the conditions being monitored. One or more transmit parameters are adjusted during the time interval in order to maintain transmission output power of the aircraft terminal below the maximum allowable transmission output power.

Power spectral density control using AIS and spreading in an aeronautical SATCOM terminal using a low profile antenna

Power spectral density in an aeronautical satellite communication system is controlled through the use of adaptive inroute selection and spreading. Once a communication session has been established between the aircraft and the satellite, environmental conditions and aircraft conditions are monitored to detect events capable of affecting transmit/receive properties during the communication session. A maximum allowable transmission output is determined based, at least in part, on governmental regulations and the conditions being monitored. One or more transmit parameters are adjusted in order to maintain transmission output power of the aircraft terminal below the maximum allowable transmission output power.

A mobile terminal for satellite communications receives communication, e.g., from a gateway via a satellite link. A frequency lock loop unit locks to the carrier frequency of the received communication. The mobile terminal includes a global positioning system for receiving global positioning data. The mobile terminal determines the Doppler frequency shift of the received communications based on the global positioning data. The mobile terminal generates a reference clock for return transmissions based on the frequency of the frequency lock loop, corrected for the Doppler shift. A correction factor of two times the determined Doppler frequency shift is used, to compensate for both a forward and return transmission link.

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Germantown, MD, United States of America

Bahman Salamat