A phenomenon of strong, gusty, downslope wind, where the cold air owing over an orographic barrier sinks and accelerates as it encounters warm air at the lee side is generally referred to as Bora wind. The seminar provides an overview of Bora wind effects, synoptic situations that lead to its occurrence, classification of Bora wind events and mathematical formalism of airmass motion needed for its analytic description. In its second part, we focus on experimental devices and techniques applicable to the wind field measurements, in particular in-situ measurements using anemometers and remote sensing measurements using lidars. In its final part we present a case study of Bora wind events in Vipava valley in period from January to April 2012, its preliminary results and the prospect for future research.
B.04 Guest lecture
COBISS.SI-ID: 3349755Bora wind is a phenomenon observed on the lee side of mountain chains, where the cold air-masses flowing over the barrier cause strong downslope winds. The relief profile of the SW Slovenia, which within 30 km of the coastal line first rises to a Karst plateau, then falls into the Vipava valley and rises again to a mountainous barrier with maximum altitudes of about 1500 m a.s.l., creates an ideal setting for the occurrence of downslope winds in the Vipava valley. Our data sample includes wind and gust speed measurements in the period from 27 January to 24 April 2012, which was selected due to strong Bora wind outbursts at that time. The obtained gust speed measurements were analyzed in order to evaluate the frequency distribution of the wind gusts.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 319657Invited lecture at the national high-school competition in computer science, taking place on 29 March 2014 at Jozef Stefan institute in Ljubljana. The lecture at the large institute lecture hall was addressed to the participants of the competition.
B.04 Guest lecture
COBISS.SI-ID: 3349499A processor has been designed and implemented with the purpose to process both GPS and GALILEO signals using different receiver tracking architectures/configurations and providing scintillation monitoring capabilities. The processor, described in this paper, includes three different tracking architectures, a traditional third order PLL, a classical adaptive Kalman Filter (KF) PLL and a scintillation based adaptive KF PLL.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 3308027Galileo signals collected at equatorial region were used in order to investigate the ionospheric impact on Galileo signals. A few attempts have been done experimenting with different tracking algorithms. Except traditional third order Phase Lock Loop (PLL) a Kalman Filter (KF) was implemented into a software receiver and in-phase and quadrature-phase samples of the prompt correlator were used to estimate two typically used scintillation parameters called, S4 index and SigmaPhi index.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 3671803