The nature of GPS differential receiver bias variability: An examination in the polar cap region

摘要: While modern GPS receiver differential code bias estimation techniques have become highly refined, they still demonstrate unphysical behavior, namely, notable solar cycle variability. This study investigates the nature of these seasonal and variabilities in polar cap region using single-station methods. It is shown that minimization standard deviation technique linearly dependent on user's choice shell height, where sensitivity this dependence varies significantly from 1 total electron content unit (1 TECU = 1016 el m−2) per 4000 km minimum winter to excess TECU 90 km during maximum summer. Using an ionosonde, we find appreciable height variability resulting up 2 TECU. Comparing northward face Resolute Incoherent Scatter Radar (RISR-N) measurements a collocated station, RISR-derived biases vary seasonally but not with cycle. RMS differences between methods observation 2009 2013 were found range 2.7 TECU 3.4 TECU, depending method. To account for erroneous approaches, fit sunspot number, removing trend. errors after detrending are reduced 1.91 TECU. Also, ISR-derived sunspot-detrended ambient temperature, significant correlation found. By temperature-fitted further reduce 1.66 TECU. These results can be taken as evidence temperature-dependent dispersion cabling antenna hardware.