Proceedings ArticleDOI
Measured results of quasi-zenith satellite visibility and its time delayed diversity (TDD) system characteristics
Takeshi Hatsuda,K. Hashimoto,J. Masuda,J. Murakami +3 more
- Vol. 2, pp 1652-1655
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TLDR
To overcome urban signal attenuation, the TDD system is applied for GSO satellites and quasi-zenith satellite systems and TDD characteristics are examined by processing measured GPS data.Abstract:
The paper deals with the time delayed diversity (TDD) system characteristics for a quasi-zenith satellite system measured using GPS (Global Positioning System) satellites. To design a digital mobile broadcast satellite system with the TDD system, it must estimate the characteristics of attenuation by urban buildings, electrical light poles, trees, etc. Signal data from southern orbital arc GPS satellites with elevation angles from 40/spl deg/ to 80/spl deg/ are used for propagation characteristics measurements, rather than from actual geostationary satellite orbit (GSO) satellites. To overcome urban signal attenuation, the TDD system is applied for GSO satellites and quasi-zenith satellite systems and TDD characteristics are examined by processing measured GPS data.read more
Citations
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Journal ArticleDOI
Diversity systems comparison of satellite visibility improvement for designing mobile broadcasting satellite system
TL;DR: In this article, the authors compared satellite diversity (Sat. D) and time-delayed diversity (TDD) in order to design a digital mobile broadcast satellite system (MBSS) using a geostationary satellite orbit (GSO) satellite.
Proceedings ArticleDOI
Proposal of time-delayed diversity (TDD)/satellite diversity (Sat.D) system for mobile broadcasting geostationary satellite system
TL;DR: Using the TDD/Sat.D system, satellite visibility for target signals in urban cities can be remarkably improved and better satellite visibilities will be required for high quality data communication or image communication systems.
Proceedings ArticleDOI
Availability Improvement Effects of Time-delayed Diversity (TDD) System for Ku-band Fixed Satellite Services (FSS) System
TL;DR: This paper deals with the approach for improving the availability of the Ku (14/12 GHz) band fixed satellite service (FSS) system by using the time-delayed diversity (TDD) system and finds that unavailability time can be rapidly improved with delay time tau=15~30 min.
References
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Packet communication ultra-small aperture terminal system for the Hokkaido Integrated Telecommunication network
TL;DR: In this article, three aspects of a new minimum cost, high reliability system strategy for the Hokkaido Integrated Telecommunication (HIT) network, in which real-time operation is not demanded, are examined.
Proceedings ArticleDOI
Multiple satellites diversity characteristics in snowing climate and system application for 14/12 GHz band
N. Okuno,R. Mitsuhashi +1 more
TL;DR: This paper deals with multiple satellite diversity (Sat. D) characteristics using six different orbital position satellites in a snowing climate and finds that by using the advantage of long distance site-diversity characteristics, transponder sharing between a large number of Earth-stations in the system can be achieved.
Proceedings ArticleDOI
Mobile broadcast geostationary satellite system propagation measurements using GPS signals
TL;DR: From processing results, more than 90% satellite visibility percentage can be achieved in an urban city by selecting two diversity satellites with separation angles more than about 45 degrees.
Proceedings ArticleDOI
Long distance site-diversity (SD) characteristics by using new measuring system
Takeshi Hatsuda,Ryuichi Mitsuhashi,Yoshinao Aoki,H. Echigo,Fumio Takahata,Yasuyuki Maekawa,Kiyotaka Fujisaki +6 more
TL;DR: This paper deals with the short and long distance (10-1400 km) site-diversity (SD) characteristics by using a newly developed measuring system using six Earth-stations transmit QPSK signals and one measuring Earth-station receives signals and processes them for site-Diversity characteristics.