ESTIMATION OF INTER-FREQUENCY BIAS FOR AMBIGUITY RESOLUTION IN GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVERS

摘要

Carrier phase measurements and code measurements are accessed (505) for satellite signals of a global navigation satellite system. An initial set of floating-point ambiguities are determined (510) based on the measurements, the initial set of floating-point ambiguities including inter-frequency bias (IFB). Disclosed example methods further include performing a least squares search process based on the initial set of floating-point ambiguities to determine a set of integer ambiguities and an estimate of the IFB (515). In some examples, an additional (e.g., wide-lane) filter is used to realize a combination of carrier phase and code IFB. In some examples, the resulting IFB estimate and the set of integer ambiguities are used to estimate a position of a receiver (520), determine a satellite correction signal, or otherwise.