The invention relates to a method comprising receiving at least one set of data on satellite signals from at least one first GNSS receiver 22, each received set of data being associated to a particular instant of time. The method further comprises estimating data for at least one additional set of data associated to a respective additional instant of time based on the at least one received set of data. The method further comprises providing data from the at least one additional set of data in addition to data from the at least one received set of data for a determination of a position of at least one second GNSS receiver 12 relative to a position of the at least one first GNSS receiver 22.