Gps multipath detection method and system

G - Physics – 01 – S

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G01S 1/04 (2006.01) G01S 1/00 (2006.01)

Patent

CA 2273157

A multipath detection method for use in a GPS position determination system includes providing a code pseudorange measurement representative of a range of an antenna to a space vehicle and a carrier phase pseudorange measurement representative of the range of the antenna to the space vehicle. A code-carrier measurement difference is then generated between the code pseudorange measurement and the carrier phase pseudorange measurement. This code-carrier measurement difference is examined to determine if a multipath component is present. If the difference indicates that multipath is likely to be present, use of such measurements in computing position solutions, such as attitude solutions, is avoided. A multipath detection system for carrying out the method is also described.

Un procédé de détection de trajets multiples destiné à un système GPS de détermination de la position, consiste à fournir une mesure de pseudodistance de code représentative d'une distance entre une antenne et un véhicule spatial, et une mesure de pseudodistance de phase de porteuse représentative de la distance entre l'antenne et ledit véhicule. Une différence de mesure code-porteuse est ensuite générée entre la mesure de pseudodistance de code et la mesure de pseudodistance de phase de porteuse. On étudie cette différence de façon à déterminer si une composante de trajets multiples est présente. Si la différence indique que les trajets multiples sont susceptibles d'être présents, on évite d'utiliser lesdites mesures pour calculer les déterminations de position, telles que les déterminations d'orientation. L'invention concerne également un système de détection de trajets multiples permettant de mettre en oeuvre le procédé.

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