Navigation-satellite tracking method and receiving station

A receiving station for use in a satellite navigation system, the receiving station comprising:

• a nearly hemispherical antenna;
• a directive antenna;
• and
• circuitry and associated logic coupled to the nearly hemispherical antenna and to the directive antenna, wherein the circuitry and associated logic cause the receiving station to at least once determine one-way range unambiguous observations for each of a set of satellites in view, wherein standard tracking channels are permanently associated to each of the satellites, wherein determining the one-way range unambiguous observations includes:
• determining one-way range unambiguous and one-way range ambiguous observations with the nearly-hemispherical antenna at a measurement time (tA) for each satellite out of the set of satellites in view simultaneously;
• sequentially determining an additional one-way range unambiguous observation with the directive antenna at respectively different further measurement times (tA+kΔt), wherein:
• one additional one-way range unambiguous observation is determined for each satellite out of the set of satellites, and
• additional tracking channels different from the standard tracking channels are used for this sequential determination;
• sequentially determining an additional one-way range ambiguous observation with the nearly-hemispherical antenna at the further measurement times tA+kΔt for each satellite out of the set of satellites in view;
• and
• transforming, satellite per satellite, the additional one-way range unambiguous observations in one-way range unambiguous observations referred to a common future time (tB), wherein this transformation is achieved by adding to each of the one-way range unambiguous observations the temporal evolution of the one-way range ambiguous observations of the respective satellite.