Estimation and Propagation of C1C-C2W DCB Values of a GPS Receiver for Higher Order Correction of the Ionospheric Effects
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Abstract
When higher accuracy is sought in the GNSS positioning, it is imperative to correct the higher order effects of ionospheric refraction. The error associated with the ionosphere is directly proportional to the total electron content (TEC) present in the atmosphere and inversely proportional to the signal frequency. When using the geometry free linear combination with the codes the calculation of TEC is influenced by the systematic error known as the differential code bias (DCB). This research has as main objective the determination of the C1C-C2W DCB values, using Single Difference technique of a GPS receiver for use in the calculation of the TEC and in the correction of the higher order effects of the ionospheric refraction. Experiments have been performed in the PPP (Precise Point Positioning) context. Additional experiments considering the propagation of DCB values for up to four weeks were conducted. This, in order to verify the possibility of decreasing the frequency of calculation of DCB values in situ. The results obtained considering the correction of the higher order of the ionospheric refraction show a better order of the millimeter in the east-west direction and in the normal direction to the ellipsoid, when compared with the processing considering only the first order corrections. For the north-south component, the improvement was in the order of centimeter. When using the propagated DCBs, the results showed an average accuracy in the PPP of 0.2 cm for latitude, 1.4 cm for longitude and 1.5 cm for altitude.
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