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In Global Navigation Satellite Systems (GNSS), ionospheric scintillation is one of the more challenging propagation scenarios, particularly affecting high-precision receivers based on carrier phase measurements. In this contribution, we propose a new digital carrier synchronization state-space formulation for the mitigation of strong scintillation. It takes into account multi-frequency GNSS observations,...
The paper gives a description of the satellite propagation measurement site established in Ljubljana. It consists of two beacon receivers, measuring the Alphasat and Astra 3B beacons at Ka-band and at Q-band, and of a co-located rain gauge. Statistical analysis of collected measurements is performed to create complementary cumulative distribution functions of excess attenuation and rain rate. First...
The Alphasat telecommunication satellite was launched in July, 2013 and beside of the main payload it carries four scientific experiments. One of them is the Aldo Paraboni Scientific Experiment, a propagation experiment in the Ka and Q radio bands. The experiment is coordinated by the European Space Agency under the framework of ARTES 8 Telecom program. Hungary, similarly to other European experimenters...
Recently, low-cost dual constellation receivers with simultaneous tracking of GPS and GLONASS satellites and raw carrier phase output have become available. This enables a faster and more reliable ambiguity fixing especially in areas with limited satellite visibility, e.g. street canyons. In this paper, we present a combined GPS/GLONASS RTK positioning with code multipath estimation for low-cost receivers...
The European Commission has recently released the official document describing the particular ionospheric model developed for the Galileo satellite navigation system. Such publication allows GNSS receiver manufacturers starting the implementation of the specific algorithm targeted for their Galileo related products in order to be compliant with the Galileo system. According to the European GNSS (Galileo)...
Positioning errors of stand-alone GNSS can be reduced with different real-time augmentation approaches. For many navigation and positioning applications, Satellite-Based Augmentation System (SBAS) and Differential code-based GNSS (DGNSS) can offer substantial improvement in the positioning accuracy. Finland is covered by EGNOS (European Geostationary Overlay Service) even though it is lying at the...
Global navigation satellite systems' performance is affected by the ionospheric signal delay. Ionospheric models are continuously enhanced to better describe ionospheric dynamics and reduce positioning errors. Changes in the geomagnetic field, influenced by the interplanetary magnetic field, reflect to the amount and distribution of the ionospheric ionization, quantified with the Total Electron Content...
The ever growing demand for higher data rates in satellite based services along with the congestion of the lower part of the frequency spectrum has led to the migration of new services to higher bands, such as the Ka-, Q/V bands. However, propagation in these bands is more prone to the atmospheric impairments; thus, the effects of the various atmospheric phenomena need to be accurately modeled and...
This paper presents the ongoing work for developing a Ka- and Q-band satellite beacon receiving station at the University of Vigo. The ground station has been developed in order to join the Alphasat Aldo Paraboni propagation experiment. This new European measurement campaing will be possible thanks to the Alphasat Aldo Paraboni payload, which has been supported by the Italian Space Agency (ASI) as...
The paper shows the results of the research concerning the determination of aircraft positioning accuracy with the use of Global Positioning System and European Geostationary Navigation Overlay Service. Experimental flights were conducted in 2013, in south-eastern part of Poland. A precise aircraft position was determined with the use of dual frequency geodetic Topcon receivers with centimeter accuracy...
The present paper describes an innovative system providing augmentation services following the cloud computing paradigm. Thanks to its flexibility it enables a large number of users to access to enhanced WADGPS functionalities in the navigation domain. Such platform, called augmentation module, relying on EGNOS and EDAS, has been originally conceived to make available integrity services to existent...
The paper presents an application of a software package for gathering in MS SQL database the high-throughput satellite navigation data, which is integrated with 3D visualization module GPS3D Viewer, developed by us as a part of Pan-European distributed system working under EGNOS Data Collection Network (EDCN). The software package is also integrated with PEGASUS, a program authorized by EUROCONTROL...
This paper summarizes recent activities in the area of tropospheric and ionospheric research undertaken by ESA in support of the development and qualification of the European Geostationary Navigation Overlay Service (EGNOS) and of the GALILEO system. Experimentation is needed to verify and validate the models used for describing the temporal and spatial variability of atmospheric conditions influencing...
Sirius XM Radio, through its Sirius and XM Satellite Radio systems, broadcasts continuous high quality audio, video and data content to over nineteen million subscribers throughout the Continental United States (CONUS) and Canada. The original Sirius system utilizes three satellites in highly inclined orbits. The original XM system utilizes two satellites in geostationary orbits. Both systems achieve...
An important system in the field of global maritime surveillance is the Automatic Identification System (AIS), which is responsible for communicating ship- and voyage-related data of surface vessels. In order to improve the performance of the existing land-based AIS system, a consortium led by OHB has been responsible for the development of a full-fledged European space-based AIS system. The main...
A space based receiving system for signals of the automatic identification system (AIS) will extend the coverage of the existing ground network, which is limited to the coastal zone (30-50 nautical miles) to open seas. With newly available satellite-based AIS receivers, the complete global ocean shipping fleet of about 60,000 ships (AIS Class A) can be tracked. The safe processing and distribution...
Satellites are expected to play an essential role in bridging the ldquodigital dividerdquo; satellite networks are likely to be the only way to provide broadband services to regions that cannot be economically reached by terrestrial networks, in particular the more remote regions of Europe and the rest of the world. Security can be a problem for such global services. This paper presents a link layer...
Despite the unqualified success of XM's GEO based satellite radio in the US, some skepticism remained until recently that this success could be duplicated in Europe and that a much more expensive HEO-based system would be needed to achieve the same success. This argument focused on the following challenges that a European GEO system needed to overcome: a) Low elevation angles b) Spectrum scarcity...
The goal of the EUROMET Project 529 is to extend the GPS receiver calibrations performed by the BIPM to all the European Laboratories that contribute with their data to the computation of the TAI. During 2004 a TTR6-AOA GPS receiver from ROA has been sent to selected European Laboratories with some expertise in former GPS calibration trips, to elaborate a procedure valid within Europe.
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