City center high-elevation angle propagation measurements at l band for land mobile satellite systems

Kanatas, AG; Constantinou, P

dc.contributor.author	Kanatas, AG	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T01:13:37Z
dc.date.available	2014-03-01T01:13:37Z
dc.date.issued	1998	en
dc.identifier.issn	0018-9545	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12618
dc.subject	L band	en
dc.subject	Land mobile satellite systems (lmss's)	en
dc.subject	Non-geo	en
dc.subject	Propagation	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Telecommunications	en
dc.subject.classification	Transportation Science & Technology	en
dc.subject.other	Electromagnetic wave propagation	en
dc.subject.other	Fading (radio)	en
dc.subject.other	Helicopters	en
dc.subject.other	Measurements	en
dc.subject.other	Mobile telecommunication systems	en
dc.subject.other	Radio transmitters	en
dc.subject.other	Troposphere	en
dc.subject.other	Urban planning	en
dc.subject.other	Propagation measurement	en
dc.subject.other	Satellite ground stations	en
dc.title	City center high-elevation angle propagation measurements at l band for land mobile satellite systems	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/25.704855	en
heal.identifier.secondary	http://dx.doi.org/10.1109/25.704855	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	A land mobile satellite system (LMSS) propagation experiment at 1.8 GHz was performed at the Athens city center during June 1996 for high-elevation angle channels. The transmitter platform used was a helicopter dying in predetermined paths to simulate high-elevation angle (60 degrees, 70 degrees, and 80 degrees) communication. A land vehicle specially prepared to accommodate the receiver system was performing the channel recordings. Four narrow streets with large building blocks were selected as representatives, and the statistical analysis presented includes cumulative distributions functions, level crossing rate (LCR), average duration of fades (AFD), and fade and unfade duration distributions. This paper also attempts a comparison of the measured data statistics with statistical models and provides least-square fit formulas for characteristic measures. The results show considerable increase of the fade depth compared to suburban and rural environments. In general, the fade depth decreases with the increasing elevation angle, and the overall analysis indicates the strong dependence of the signal attenuation on the width of the streets, average building height, and vegetation at the edges of the streets.	en
heal.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	en
heal.journalName	IEEE Transactions on Vehicular Technology	en
dc.identifier.doi	10.1109/25.704855	en
dc.identifier.isi	ISI:000075214800029	en
dc.identifier.volume	47	en
dc.identifier.issue	3	en
dc.identifier.spage	1002	en
dc.identifier.epage	1011	en