Xm Satellite Radio Inc.

Amsc Subsidiary Corporation

Charles Kittiver

Gary G Churan

Richard Andrew Michalski

David J Ross

A system for and method of providing optimizing the antenna patterns on a first satellite and a second satellite that operate in conjunction to deliver content to a single radio receiver. The process begins by first selecting an objective predictive model for predicting link margin at a first location and a link margin at a second location. The model is used further to determine an initial required transmit power flux densities to achieve the first and second link margins. Then the power flux density is adjusted for the first location by decreasing the power flux density for the first satellite and simultaneously increasing the power flux density for the second satellite. The predicted joint availability for the first location is then predicted. In the event the required power flux density cannot be achieved to achieve a desired joint availability across an entire geographical region, the power flux density for both the first and second satellites for the first location are decreased.

System for and method of jointly optimizing the transmit antenna patterns of two geostationary satellites in a satellite broadcasting system

An antenna mount for a vehicle includes a two axis gimbaled mounting which allows the antenna to rotate in two axes. A pendular mass is provided to maintain the antenna in a particular orientation in the absence of any externally applied acceleration. A chamber is provided attached to the pendular mass for holding a viscous dampening fluid. The dampening fluid allows the antenna mount to rotate in response to an externally applied acceleration but serves to dampen any oscillations induced by an externally applied acceleration. The antenna mount maintains the antenna in substantially a predetermined position despite the influence of externally applied accelerations. Shock absorbers may be supplied to the gimbal mounting to aid in the dampening of large accelerations.

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Vienna, VA, United States of America

Charles Kittiver