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Current Status of NeLS Project-A Study of Global Multimedia Mobile Satellite Communications
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  • Current Status of NeLS Project-A Study of Global Multimedia Mobile Satellite Communications
  • Current Status of NeLS Project-A Study of Global Multimedia Mobile Satellite Communications
저자명
Suzuki. Ryutaro,Nishiyama. Iwao,Motoyoshi. Shigeru,Yasuda. Yasuhiko
간행물명
Joint Conference on Satellite Communications
권/호정보
2001년|2001권 1호|pp.57-62 (6 pages)
발행정보
통신위성우주산업연구회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

NeLS Research Center was formed in the end of 1997, and started the key technology developments of the low earth orbit constellation system for global multimedia mobile satellite communications service. For the NeLS constellation, 120 satellites with 1200 km of satellite altitude, was selected. For the satellite antenna developments, the digital beam forming technology was employed. In order to reduce the SSPA power consumption and to keep good linearity, novel pre-distortion type and distortion feedback type linearizer were developed. For the optical ISL system, de optical modem and optical tracking mechanism were developed. The optical DPSK/differential detection modem was evaluated. For the optical antenna mechanism, Coude type, the elbow type and the active universal joint type of optical antenna mechanism were developed. For the satellite network study, the satellite ATM network simulator was developed.