Patent ID: 8072373
Filing Date: 2011-12-06
Classification: G01S

Abstract:
1. A method for accuracy estimation with continuous representation of network based corrections for a satellite-aided positioning system, with a network of reference stations for receiving signals transmitted by satellites of the positioning system and transmitting corrections to a rover, wherein the method comprises: recording code and phase measurements by the reference stations; transferring the measurements to a network processing center; converting the measurements to dispersive and/or non-dispersive observables; correcting the measurements for the geometric range, ambiguity, antenna phase centre variations, tropospheric path delays using a standard atmosphere model and clock error; calculating single-differences between a master station and at least one auxiliary station selected for each reference station; generating estimates of single-difference between each reference station and the corresponding master station; calculating slant residuals for each reference station and satellite by using the difference between calculated single-differences and estimates; forming double-differences by differencing between the slant residuals for each satellite s and the slant residuals of a reference satellite k; calculating zenith residuals by mapping the double-differences to the zenith direction; computing dispersive and/or non-dispersive error values for each reference station by using the zenith residuals; and estimating the residual dispersive and/or non-dispersive error values for a potential or actual rover position after the network corrections have been applied by combining dispersive and/or non-dispersive error values of all reference stations.