ODZIV GEODETSKIH INSTRUMENTOV GNSS NA MOTENJE Z ODDAJNIKOM PRELETNEGA SIGNALA L1

KLJUČNE BESEDE GNSS, namerno motenje signala, motilnik L1, prekinitev signala, razmerje signal-šum ABSTRACT This paper presents the results of a vulnerability test of several geodetic Global Navigation Satellite System (GNSS) receivers in case of intentional signal interference in the frequency L1 for GPS (Global Positioning System). An analysis of different scenarios showed that the jammer interrupted GPS but not GLONASS signals in certain situations. Since Galileo was not nominally operational at the time of the July 2019 measurements, only GPS and GLONASS were eligible for the study. The geodetic GNSS instruments reacted to the interruptions with a decreased signal-to-noise-ratio (SNR) and either with a complete inability to determine the code/phase position or with an incorrect calculation of phase ambiguities (initialization), which also affected the quality of the positioning. KEY WORDS GNSS, intentional signal interference, jammer L1, signal interruptions, signal-to-noise ratio (ProQuest: ... denotes formulae omitted.) 1 UVOD Pri vsakodnevni uporabi in zanašanju na tehnologijo globalnega pozicioniranja enega ali već globalnih satelitskih navigacijskih sistemov (angl.