Motorola Corporation

Michael Dane Ince

Thomas Peter Emmons, Jr

Jonathan Henry Gross

Shawn Wesley Hogberg

James William Startup

Robert Anthony Peters

Craig L Fullerton

John Richard Erlick

Jim E Helm

Cynthia C Matthews

John G Lambrou

Robert H Smith

David L Krueger

Susan L Harris

Allen H &lsquo;Skip&rsquo; Nelson

A method of increasing satellite communication quality by using a MEO satellite constellation ( ) and a LEO satellite constellation ( ) in combination with a decision algorithm which selects the appropriate constellation to route a communication signal through. The decision algorithm can be embodied in three ways: gateway based ( ), individual subscriber unit based ( ) and satellite based ( ). The MEO constellation ( ) and LEO ( ) constellation may be cross-linked, allowing for switching of service between satellites, as needed, during a communication session.

System for providing optimal satellite communication via a MEO/LEO satellite constellation

A space vehicle uses a signal received from a global positioning system (GPS) satellite (51, FIG. 1) to determine the attitude of a space vehicle. The signal is received through a pair of antennas (10, 11) and converted to sum and difference outputs by a sum and difference circuit (30). These outputs are then conveyed to down converter/correlators (55), and then to envelope detectors (60). The outputs of the envelope detectors (60) are then converted to a digital format by an analog to digital converter (70). The digitally formatted sum and difference amplitudes are then used by a processor (80) to calculate the required attitude adjustment to the space vehicle.

Method and system for attitude sensing using monopulse GPS processing

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Chandler, AZ, United States of America

Michael Dane Ince