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GNSS

The add-on uses pesudorange observations measured by GPS reference stations to correct the sharing error of receiver's pesudorange observations by Pesudorange Correction(PSC). Then the corrected pesudorange observations are used to position with improved accuracy[1]. Extended Kalman Filter(EKF) is used as the solution technology to calculate the positioning, the states in solution are position, speed and time in 3-dimensional[2]. Be well noted, the GPS accuracy can be influenced by environments such as in basements, on overpasses or near-by tall buildings; the positioning accuracy could drop due to the satellite signals being shielded. To enhance product performance, used in open space or non-shield space is recommended.

1.Parkinson BW and Spilker J J Jr. (1996) Global Positioning System: Theory and Applications, Volume 2, John Wiley & Sons, Inc.

2.Gelb A (1974) Applied Optimal Estimation, Cambridge, MA: MIT Press. ISBN: 0262570483