Abstract: The invention relates to methods, apparatuses and computer programs for generating receiver-specific correction information for correcting pseudorange observations. The method comprises: receiving raw observations obtained by the NSS receiver observing NSS multiple frequency signals from a plurality of NSS satellites over multiple epochs; obtaining precise satellite information on: (i) the orbit position of each of the satellites, (ii) a clock offset of each of the satellites, and (iii) a set of biases associated with each of the satellites; estimating ambiguities in the carrier phase of the received raw observations, using the precise satellite information, or information derived therefrom; computing combination values based on the received raw observations together with the estimated ambiguities, to cancel out the effects of the geometry, the effects of the clocks, troposphere and ionosphere; and generating the correction information per satellite, based on the computed combination values.

Abstract: The invention relates to methods, apparatuses and computer programs for generating receiver-specific correction information for correcting pseudorange observations. The method comprises: receiving raw observations obtained by the NSS receiver observing NSS multiple frequency signals from a plurality of NSS satellites over multiple epochs; obtaining precise satellite information on: (i) the orbit position of each of the satellites, (ii) a clock offset of each of the satellites, and (iii) a set of biases associated with each of the satellites; estimating ambiguities in the carrier phase of the received raw observations, using the precise satellite information, or information derived therefrom; computing combination values based on the received raw observations together with the estimated ambiguities, to cancel out the effects of the geometry, the effects of the clocks, troposphere and ionosphere; and generating the correction information per satellite, based on the computed combination values.