The temporal dependence of GPS cycle slip in low-latitude region

Cycle slip is a typical anomaly phenomenon for GPS carrier phase measurements and frequent occurrence of cycle slip would greatly degrade the quality of GPS positioning. Although the degradation of GPS signal to noise or even the loss of lock related with radio wave interference have been found during severe solar radio burst event accompanying with solar flare, long-term studies show that for a given GPS receiver, loss of lock or cycle slip with higher satellite elevations is mainly caused by deep signal fade or strong phase fluctuation related to the ionospheric irregularities.