Station transmitting correction signals to a navigation...

G - Physics – 01 – S

Patent

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G01S 5/14 (2006.01)

Patent

CA 2315899

The invention concerns a station transmitting correction signals to a navigation receiver of the differential type determining the position of a mobile station based on the measurement of distances separating said mobile from at least three satellites or beacons. Each measurement is corrected by a correction signal, transmitted by the station, which represents the difference between the distance, measured at the station, from said station to the satellite concerned and the real value of said difference. The station comprises, for measuring the distances to the satellites, at least two sets of receiver equipment so arranged as to minimise the probability that the two sets of equipment simultaneously receive signals affected by multi-paths. Each receiver equipment (10, 12, 14) comprises a navigation receiver (20¿1?, 20¿2?, 20¿3?), for example of the differential type, designed to supply a signal representing said equipment measured position, and the station comprises means (16) for comparing with a threshold the distance separating each equipment measured position from said equipment real position and for controlling the transmission of correction signals based on the results of the comparisons. The threshold takes into account the importance given to each direction.

L'invention est relative à une station émettrice de signaux de correction vers un récepteur de navigation de type différentiel qui détermine la position d'un mobile à partir de la mesure de distances séparant le mobile d'au moins trois satellites ou balises. Chaque mesure est corrigée par un signal de correction, émis par la station, qui représente la différence entre la distance, mesurée à la station, de cette station au satellite concerné et la valeur réelle de cette même distance. La station comporte, pour la mesure des distances aux satellites, au moins deux équipements de réception disposés de façon à minimiser la probabilité que ces deux équipements reçoivent simultanément des signaux affectés de multi-trajets. Chaque équipement de réception (10, 12, 14) comporte un récepteur de navigation (201, 202, 203), par exemple du type différentiel, destiné à fournir un signal représentant la position mesurée de cet équipement, et la station comprend un moyen (16) pour comparer à un seuil la distance séparant la position mesurée de chaque équipement à la position réelle de cet équipement et pour commander l'émission des signaux de correction en fonction du résultat des comparaisons. Le seuil tient compte de l'importance accordée à chaque direction.

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