Title :
Measured results of quasi-zenith satellite visibility and its time delayed diversity (TDD) system characteristics
Author :
Hatsuda, Takeshi ; Hashimoto, Kazuya ; Masuda, Junko ; Murakami, Jun
Author_Institution :
Hokkaido Inst. of Technol., Sapporo, Japan
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° to 80° 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.
Keywords :
Global Positioning System; digital radio; direct broadcasting by satellite; diversity reception; electromagnetic wave absorption; electromagnetic wave scattering; mobile satellite communication; parameter estimation; radiowave propagation; Global Positioning System satellites; attenuation characteristics estimation; digital broadcast system; digital mobile broadcast satellite system; electrical light poles; geostationary satellite orbit satellites; mobile satellite system; quasi-zenith satellite visibility; southern orbital arc GPS satellites; time delayed diversity system characteristics; trees; urban buildings; Buildings; Delay effects; Delay systems; Extraterrestrial measurements; Global Positioning System; Optical attenuators; Optical propagation; Position measurement; Satellite broadcasting; Time measurement;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1330511
