Patent ID: 8378887

Claim:
A method for synthesizing global navigation satellite system (GNSS) measurements, the method comprising: receiving, by a navigation device, a GNSS signal from a signal source; calculating pseudoranges (PRs) and delta pseudo ranges (DPRs) associated with the GNSS signal; identifying the signal source as a lost signal source when the GNSS signal is not being received; estimating PRs and DPRs for the lost signal source based on previously calculated PRs and DPRs of the lost signal source; determining a position of the navigation device using dead reckoning; determining a validity of the estimated PRs and DPRs based on the dead reckoning; and calculating a position fix using the calculated PRs and DPRs, and the estimated PRs and DPRs in a navigation solution based on the determined validity of the estimated PRs and DPRs.