Method for determining the position of a satellite navigation system receiver, and associated system

A method for determining the position of a satellite navigation system receiver in which use is made of a probabilistic weighting of the signals received, the said weighting using a coefficient Ki, for each satellite of index i, the said coefficient Ki being a product of factors each comprising a probability of existence of a disturbance, the said coefficient Ki, for each satellite of index i, comprising at least one factor of the form (1−Pji)ai, j varying from 1 to 6 in which:

• P1i represents, for the satellite of index i, a first probability that the signal received comprises a combination of a non-reflected signal component and of a multi-path signal component,
• P2i represents, for the satellite of index i, a second probability that the signal received comprises solely a multi-path signal component,
• P3i represents, for the satellite of index i, a third probability that the signal received is jammed by terrestrial interference,
• P4i represents, for the satellite of index i, a fourth probability that the signal received comprises a combination of a component of a signal generated by a jammer on the ground and of a component of the nominal signal,
• P5i represents, for the satellite of index i, a fifth probability that the signal received is not in coherence with previous conditions of reception of the said signal,
• P6i represents, for the satellite of index i, a sixth probability that the signal received is not in coherence with a mapping of the environs, and
• ai represents a positive real.