SMARTPHONE GNSS LOCALIZATION BY DDP AND PPP TECHNIQUES

Abstract

This dissertation illustrates the performance of a dual-frequency GNSS chip smartphone in GNSS localization in motion. The GNSS localization was performed using the DDP and PPP methods. The smartphone was in motion on a railway and observed the satellites' data for approximately 90 minutes. The smartphone dual-frequency data was processed as single frequency and code measurements due to the limitations of the GNSS processing software and the smartphone antenna. The accuracy of the smartphone DDP and PPP results were at meter level and very similar to each other, such that the difference did not exceed 1 m in all comparison aspects. In contrast, the difference was vast between the smartphone PPP and a geodetic receiver PPP that was running synchronized with the smartphone on the railway; the geodetic receiver PPP provided an accuracy of centimetre which could be possible from the smartphone in the future, but clearly is not yet possible.