@article {99,
	title = {GNSS Reliability Testing in Signal-Degraded Scenario},
	journal = {International Journal of Navigation and Observation},
	year = {2013},
	pages = {{\textendash}},
	abstract = {<p><span style="color: rgb(0, 0, 0); font-family: MinionPro-Regular, sans-serif; font-size: 17px; line-height: 20px; text-align: justify; background-color: rgb(255, 255, 255);">Multiconstellation satellite navigation is critical in signal-degraded environments where signals are strongly corrupted. In this case, the use of a single GNSS system does not guarantee an accurate and continuous positioning. A possible approach to solve this problem is the use of multiconstellation receivers that provide additional measurements and allows robust reliability testing; in this work, a GPS/GLONASS combination is considered. In urban scenario, a modification of the classical RAIM technique is necessary taking into account frequent multiple blunders. The FDE schemes analysed are the {\textquotedblleft}Observation Subset Testing,{\textquotedblright} {\textquotedblleft}Forward-Backward Method,{\textquotedblright} and {\textquotedblleft}Danish Method{\textquotedblright}; they are obtained by combining different basic statistical tests. The considered FDE methods are modified to optimize their behaviour in urban scenario. Specifically a preliminary check is implemented to screen out bad geometries. Moreover, a large blunder could cause multiple test failures; hence, a separability index is implemented to avoid the incorrect exclusion of blunder-free measurements. Testing the RAIM algorithms of GPS/GLONASS combination to verify the benefits relative to GPS only case is a main target of this work too. The performance of these methods is compared in terms of RMS and maximum error for the horizontal and vertical components of position and velocity.</span></p>},
	issn = {1687-5990},
	doi = {10.1155/2013/870365},
	url = {http://dx.doi.org/10.1155/2013/870365},
	author = {Angrisano, Antonio and Gioia, Ciro and Gaglione, Salvatore and Del Core, Giuseppe}
}
