The Boeing Company

Mcdonnell Douglas Corporation

Theboeing Company

Christopher J Martens

Gregory M Gutt

David Arthur Whelan

Robert W Brumley

Anne T Haddad

Jeong-Beom Ihn

Barton G Ferrell

Michael Eglington

James Joseph Meany

Rachel Rané Schmalzried

A method and system are disclosed for providing an estimate of a location of a user receiver device. The method and system involve emitting from at least one vehicle at least one spot beam on Earth, and receiving with the user receiver device a signal from at least one spot beam. In one or more embodiments, at least one vehicle may be a satellite and/or a pseudolite. The method and system further involve calculating with the user receiver device the estimate of the location of the user receiver device according to the user receiver device's location within at least one spot beam. In some embodiments, when the user receiver device receives signals from at least two spot beams, the user receiver device calculates the estimate of the location of the user receiver device to be located in the center of the intersection of at least two spot beams.

Geolocation leveraging spot beam overlap

The disclosed method and system is used to determine the position of a user device. The user device can receive data signals and/or carrier signals from orbiting space vehicles. These data signals can be used for positioning calculation and/or track maintenance of the user device. The disclosed method and system can account for time and frequency biases of the user device. For the track maintenance, a Kalman filter state estimator can be extended to include a velocity of the user device.

Method for positioning determinations of receivers

Positioning determinations of receivers

A method is present for processing a signal. A response signal is received from a structure. The response signal is decomposed into a plurality of signals based on a number of characteristics. A mode in the plurality of signals is identified based on a number of known characteristics for the mode, wherein the mode has a velocity.

Mode identification and decomposition for ultrasonic signals

Various techniques are provided for calibrating a frequency of a local clock using a satellite signal. In one example, a method of transferring frequency stability from a satellite to a device includes receiving a signal from the satellite. The method also includes determining a code phase from the satellite signal. The method further includes receiving aiding information. In addition, the method includes calibrating a frequency of a local clock of the device using the code phase and the aiding information to substantially synchronize the local clock frequency with a satellite clock frequency.

Local clock frequency calibration using low earth orbit (LEO) satellites

The error resilient method and apparatus for encoding data includes an encoder including a code word generator for generating a plurality of code words representative of respective portions of the data. The code word generator encodes data pursuant to split field coding in which each code word includes a prefix field and an associated suffix field. The prefix field includes information representative of a predetermined characteristic of the associated suffix field, such as the predetermined number of characters which form the associated suffix field. In addition, the suffix fields include information representative of at least some of the original data. Consequently, if the prefix field of a code word is decoded correctly, i.e, without the occurrence of bit error, the error resilient method and apparatus can correctly determine the length of the associated suffix field and the range of coefficient values to be represented by the associated suffix field such that the associated suffix field is resilient to errors. In order to increase the probability that the prefix field will be correctly decoded, the method and apparatus protects the prefix and suffix fields of the encoded data to greater and lesser degrees, respectively, such that the data can be more efficiently compressed.

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Creve Coeur, MO, United States of America

Christopher J Martens