Patent ID: 9128176
Filing Date: 2015-09-08
Classification: G01S

Abstract:
1. A method of operating a processor having associated data storage and program code enabling the processor to process a set of GNSS signal data derived from code observations and carrier-phase observations at multiple receivers of GNSS signals of multiple satellites over multiple epochs, the GNSS signals having at least two carrier frequencies, comprising: operating the processor to form an MW (Melbourne-Wübbena) combination per receiver-satellite pairing at each epoch to obtain a MW data set per epoch, the MW data set per epoch including a plurality of MW combinations, each of the plurality of MW combinations formed between one of the multiple receivers and one of the multiple satellites, and operating the processor to estimate from the MW data set per epoch an MW bias per satellite which may vary from epoch to epoch, and a set of WL (widelane) ambiguities, each WL ambiguity corresponding to one of a receiver-satellite link and a satellite-receiver-satellite link, wherein the MW bias per satellite is modeled as one of (i) a single estimation parameter and (ii) an estimated offset plus harmonic variations with estimated amplitudes.