Patent ID: 7877207
Filing Date: 2011-01-25
Classification: G01S

Abstract:
1. A method of obtaining tropospheric delay data for use in increasing the accuracy with which the location of a receiver in a global navigation satellite system (GNSS) can be determined, the method comprising the steps of: generating a first set of approximate tropospheric delay values applicable to various receiver geographical locations from a first model at a location remote from said receiver; generating a second set of accurate tropospheric delay values applicable to said various receiver geographical locations from a second model, which is a meteorological model, at a location remote from said receiver; developing a set of tropospheric delay value modifications applicable to said first model so that together, said first model and said tropospheric delay value modifications can provide a set of tropospheric delay values substantially in agreement with said second set of accurate tropospheric delay values; and communicating said set of tropospheric delay value modifications to said receiver.