Positioning equipment

Abstract

The invention relates to a receiver of a satellite positioning system. In order to obtain reliable positions with a low sampling rate said receiver comprises: reception means (3) for receiving signals from satellites (S1, S2) in order to calculate the locations and the speeds of said satellites, measuring means (4) for measuring the doppler shifts of said signals, calculating means (5) for calculating preliminary positional coordinates of said receiver based on the locations of the satellites, the speeds of the satellites and the measured doppler shifts of said signals, pseudo-distance calculation means (6) for calculating pseudo-distances between the receiver and said satellites based on propagation times of signals transmitted at predetermined moments from said satellites to said receiver, comparison means (7) for comparing the calculated pseudo-distances with distances calculated based on said preliminary positional coordinates and the locations of the satellites, and for controlling said pseudo-distance calculation means for recalculating the pseudo-distances under predetermined conditions, and means (8) for calculating the position of said receiver based on the calculated pseudo-distances and the locations of said satellites.

Dependencies are inferred from the claim text.