Data processing: measuring – calibrating – or testing – Calibration or correction system – Position measurement
Patent
1996-12-30
2000-12-05
Shah, Kamini
Data processing: measuring, calibrating, or testing
Calibration or correction system
Position measurement
701207, 701213, 342357D, 34235706, H04B 7185, G01S 500
Patent
active
061578967
ABSTRACT:
A method for determining the geolocation of an object such as a vehicle traversing the earth's surface or airborne thereabove includes employing a device which is capable of operating autonomously to transmit signals to a selected low earth orbit (LEO) satellite for relay to a receiving station whose position is known, identifying the device and its geolocation, speed, altitude and/or heading. The device includes a microcomputer which operates a Global Positioning System (GPS) receiver for receiving GPS signals to identify the device geolocation and the precise time. A nonvolatile memory on board the device stores LEO satellite ephemeris data, satellite operational and message formatting parameters, LEO satellite visibility footprint data and visibility contour information for the device caused by obstacles which are permanently or temporarily in proximity to the device during deployment and which block transmission of signals between the device and the LEO satellite, depending on relative positions. Geolocation information is transmitted to a LEO satellite for relay to the receiving station after calculation of covisibility of the satellite with the receiving station and the transmitter antenna for the device, taking into account the device visibility contour and heading. The device transmitter antenna may have a steering mechanism for causing the antenna to be aimed at a predetermined azimuth and elevation wherein the transmitted signals will be intercepted by the LEO satellite.
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Boyd, Jr. Austin Walker
Castles Milford Pike
Moryl James Andrew
Shah Kamini
Southwest Research Institute
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