Naslov
A study on multi-constellation GNSS positioning performance in terms of maritime requirements

Autori
Kos, Serđo ; Pongračić, Barbara ; Brčić, David

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 12th Annual Baška GNSS Conference / Lenac, Kristijan ; Brčić, David ; Kos, Serđo ; Valčić, Marko ; Jugović, Alen ; Horvat, Marko - Rijeka : Pomorski fakultet Sveučilišta u Rijeci, 2019, 69-84

ISBN
978-953-165-109-7

Skup
12th Annual Baška GNSS Conference

Mjesto i datum
Baška, Hrvatska, 06.05.2018. - 09.05.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
global navigation satellite systems, satellite positioning accuracy, horizontal dilution of precision, maritime navigation, GNSS applications

Sažetak
Satellite navigation represents official positioning mean in maritime navigation. Importance of Global Navigation Satellite System (GNSS) increases with the emerging number of the world fleet, standard and critical services as well as the development of autonomous vessels. Quality of the GNSS positioning performance can be assessed by positioning accuracy, availability and Dilution of Precision (DOP), latter representing the influence of satellite geometry. DOP values depend on the relative position of the receiver and visible satellites. The GNSS positioning error is approximately equal to the product of the respective DOP value and the ranging accuracy. In maritime navigation where vertical positioning component can be omitted, DOP is reduced to the horizontal determination (HDOP). Limit values are defined in respective Performance Standards provided by the International Maritime Organization (IMO). The aim is to state the improvement of GNSS performance regarding employment and combination of different GNSSs as related to GPS, being the most commonly used system in maritime navigation. GPS, GLONASS, Galileo and BeiDou observations from four stations located in Italy, Peru, China and the United States were used. These stations were chosen due to their locations and the availability of positioning from all operational GNSSs. For each location, all possible combinations between satellite constellations were made. The HDOP values, single frequency positioning solutions in a horizontal plane and positioning availability were analysed for December 2017. Analyses of HDOP values confirm improvements in satellite positioning compared to GPS. An insufficient number of BeiDou satellites over the United States resulted in large HDOP values at the MDO1 IGS station (Fort Davis, USA). For the same reason, the best average HDOP values were observed at the JFNG station (Jiufeng, China). Although not fully operational the BeiDou system improved positioning performance when it was combined with a GPS system, as proved at the AREG IGS station, located in Arequipa, Peru. Moreover, the GPS/ BeiDou combination had better performance at JFNG and PADO (Padua, Italy) stations when compared with GPS/GLONASS combination.

Izvorni jezik
Engleski

Znanstvena područja
Tehnologija prometa i transport, Interdisciplinarne tehničke znanosti, Informacijske i komunikacijske znanosti

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