Method and system for recreating unavailable GNSS measurements

A method for recreating unavailable measurements in a global navigation satellite system (GNSS) receiver, the method comprising:

• receiving at least one tracking signal from a GNSS satellite in a first frequency band, the first frequency band including a first carrier frequency (fi), the at least one tracking signal providing at least an available pseudorange measurement (Pi) at the first carrier frequency (fi) and an available carrier phase measurement (ϕi) at the first carrier frequency (fi);
• receiving at least one correction signal in a second frequency band, the second frequency band including a target carrier frequency (fk) and not including the first carrier frequency (fi);
• without using any prior measurements from the GNSS satellite at the target carrier frequency (fk):
• deriving, from at least the available pseudorange measurement (Pi), a pseudorange estimate ({circumflex over (P)}k) at the target carrier frequency (fk);
• and
• deriving, from at least the available pseudorange measurement (Pi) and from at least the available carrier phase measurement (ϕi), a carrier phase estimate (ϕk) at said target carrier frequency (fk);
• determining a simulated tracking measurement using the pseudorange estimate ({circumflex over (P)}k) and the carrier phase estimate (ϕk);
• and
• determining a location parameter based on said simulated tracking measurement and said at least one correction signal.

A system for determining a location using a global navigation satellite system (GNSS), the system comprising:

• first receiving means configured to receive at least one tracking signal from a GNSS satellite in a first frequency band, the first frequency band including a target carrier frequency (fk);
• second receiving means configured to receive at least one correction signal providing at least one of an available pseudorange measurement (Pi) or an available carrier phase measurement (ϕi) at a second carrier frequency (fi), wherein the second carrier frequency (fi) is outside of the first frequency band;
• and
• processing means configured to:
• (a) without using any prior measurements from the GNSS satellite at the target carrier frequency (fk), derive, from said available pseudorange measurement (Pi), a pseudorange estimate ({circumflex over (P)}k) at the target carrier frequency (fk);
• (b) without using any prior measurements from the GNSS satellite at the target carrier frequency (fk), derive, from said available pseudorange measurement (Pi) and said available carrier phase measurement (ϕi), a carrier phase estimate ({circumflex over (ϕ)}k) at said target carrier frequency (fk);
• or
• (c) both (a) and (b).