Position determination using two low-earth orbit satellites

G - Physics – 01 – S

Patent

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Details

G01S 5/14 (2006.01) G01S 5/00 (2006.01) G01S 5/12 (2006.01) H04B 7/185 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2267335

A system and method for passively determining the position of a user terminal (for example, a mobile wireless telephone) in a low-Earth orbit satellite communications system (100). The system includes a user terminal (106A, 106B, 106C), at least two satellites (104A, 104B) with known positions and known velocities, and a gateway (102) (that is, a terrestrial base station) for communicating with the user terminal (106A, 106B, 106C) through the satellites (104A, 104B). The method includes the steps of determining a range difference parameter (804) and a range-rate difference parameter (806). A range difference parameter represents the difference between (1) the distance between a first one of the satellites (104A, 104B) and the user terminal (106A, 106B, 106C) and (2) the distance between a second one of the satellites (104A, 104B) and the user terminal (106A, 106B, 106C). A range- rate difference parameter represents the difference between (a) a relative radial velocity between a first one of the satellites (104A, 104B) and the user terminal (106A, 106B, 106C) and (b) a relative radial velocity between a second one of the satellites (104A, 104B) and the user terminal (106A, 106B, 106C). The position of the user terminal (106A, 106B, 106C) on the Earth's surface is then determined (810) based on the known positions and known velocities of the satellites, the range difference parameter, and the range-rate difference parameter.

L'invention concerne un système et un procédé destinés à déterminer de façon passive la position d'un terminal utilisateur (par ex., d'un téléphone sans fil mobile) dans un système de communications (100) par satellite sur orbite terrestre basse. Ce système comprend un terminal utilisateur (106A, 106B, 106C), au moins deux satellites (104A, 104B) dont les positions et les vitesses sont connues, et une passerelle (102) (c'est-à-dire une station de base terrestre) pour communiquer avec le terminal utilisateur (106A, 106B, 106C) via les satellites (104A, 104B). Ce procédé comprend les étapes consistant à déterminer un paramètre (804) de différence de distances et un paramètre (806) de différence de vitesses radiales. Un paramètre de différence de distances représente la différence entre (1) la distance entre un premier satellite (104A, 104B) et le terminal utilisateur (106A, 106B, 106C), et (2) la distance entre un second satellite (104A, 104B) et le terminal utilisateur (106A, 106B, 106C). Un paramètre de différence de vitesses radiales représente la différence entre (a) une vitesse radiale relative entre un premier satellite (104A, 104B) et le terminal utilisateur (106A, 106B, 106C), et (b) une vitesse radiale relative entre un second satellite (104A, 104B) et le terminal utilisateur (106A, 106B, 106C). La position du terminal utilisateur (106A, 106B, 106C) sur la surface de la terre est ensuite déterminée (810) sur la base des positions et des vitesses connues des satellites, le paramètre de différence de distances, et le paramètre de différence de vitesses radiales.

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