Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1996-09-30
2000-08-22
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
455 121, G01S 502, H04B 7185
Patent
active
061079596
ABSTRACT:
A system and method for determining the position of a user terminal (for example, a mobile wireless telephone) in a low-Earth orbit satellite communications system. The system includes a user terminal, at least one satellite with a known position and velocity, and a gateway (that is, a terrestrial base station) for communicating with the user terminal through the satellites. The method includes the steps of determining a range parameter and a range-rate parameter. A range parameter represents a distance between the satellite and the user terminal. A range-rate parameter represents a relative radial velocity between that satellite and the user terminal. The position of the user terminal on the Earth's surface is then determined based on the range parameter, the range-rate parameter, and the known position and velocity of the satellite.
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Issing Gregory C.
Ogrod Gregory D.
Qualcomm Incorporated
Wadsworth Philip R.
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