1.

Analysis of the PLL phase error in presence of simulated ionospheric scintillation events

The phase error and the performance of a typical PLL embedded into commercial multi-constellation GNSS receiver was analyzed in presence of simulated ionospheric scintillation. Large phase errors occurred during scintillation-induced signal fluctuations although cycle slips only occurred during the signal re-acquisition after a loss of lock. Losses of lock occurred whenever the signal faded below the minimum $C/N_{0}$ threshold allowed for tracking. The simulations were performed for different signals (GPS L1C/A, GPS L2C, GPS L5 and Galileo L1). L5 and L2C proved to be weaker than L1.

COBISS.SI-ID: 2423803

2.

Correlation analysis between ionospheric scintillation levels and receiver tracking performance

This paper presents an analysis of correlation between scintillation levels and tracking performance of a GNSS receiver for GPS L1C/A, L2C and GLONASS L1, L2 signals. The study presents for the first time this type of correlation analysis for GPS L2C and GLONASS L1, L2 signals. Results reveal that the dependence of the phase tracking jitter on the scintillation levels can be represented by a quadratic fit for the signals. The results presented in this paper are of importance to GNSS users, especially in view of the forthcoming high phase of solar cycle 24 (predicted for 2013).

COBISS.SI-ID: 2424059

3.

Optimum parameter for estimating phase fluctuations on transionospheric signals at high latitudes

Data from a GPS scintillation monitor based on 50 Hz measurements recorded at Dirigibile Italia Station (NyAlesund, Svalbard), in the frame of the ISACCO project are used to investigate possible adoption of an alternative parameter for the estimate of phase fluctuations: i.e., the standard deviation of the phase rate of change S_phi.

COBISS.SI-ID: 1844987

4.

Observations of the atmospheric boundary layer across the land-sea transition zone using a scanning Mie lidar

Optical properties of the atmospheric boundary layer (ABL) above the land-sea transition interface were measured using a scanning Mie lidar at a location 30km from the Adriatic coast. Based on the 2­dimensional range-height ­indicator scans, detailed information on the ABL was obtained, including parameters such as atmospheric optical depth, aerosol extinction coefficient and the height of the ABL.

COBISS.SI-ID: 1619451

5.

Tackling ionospheric scintillation threat to GNSS in Latin America

Analysis presents initial results from a research work aimed to tackle ionospheric scintillation effects for GNSS users in Latin America. This research is a part of the CIGALA project, co­funded by the EC Seventh ANG Framework Program and supervised by the GNSS Supervisory Authority (GSA), which aims to develop and test ionospheric scintillation countermeasures to be implemented in multi­frequency, multi­ constellation GNSS receivers.

COBISS.SI-ID: 2127355