Transcript Document
Case Studies of Wireless Technologies in Mérida, Venezuela Part 2: 5.8 GHz Ermanno Pietrosemoli Latin American Networking School www.eslared.org Universidad de los Andes Mérida- Venezuela [email protected] Pietrosemoli, ICTP Feb 2003 1 Mérida Atmospheric Research Station (MARS) Currently preparing the radiometer for installation on Pico Espejo at Mérida, Venezuela (8°N, 71°W, 4765 m asl). MIRA 2 will be part of the joint Venezuelan and German project of the Mérida Atmospheric Research Station (MARS). Two ground-based microwave radiometers and an optical instrument operating in DOAS mode will be installed on Pico Espejo by the Forschungszentrum Karlsruhe and the University of Bremen. FTIR, LIDAR, and UV-A/B spectrometers will be deployed at the nearby Instituto Astrofisico at an altitude of 3600 m by the Alfred-Wegener-Institut, Bremerhaven. Pietrosemoli, ICTP Feb 2003 2 Mérida Atmospheric Research Station (MARS) (64 kB) View over Pico Espejo at 4765 m. The instruments for atmospheric research will be installed in the building in the foreground. Pietrosemoli, ICTP Feb 2003 3 Mérida Atmospheric Research Station (MARS) Pico Espejo is expected to provide excellent conditions for ground-based millimeter wave radiometry due to its low total column water vapor content. Analyses using NCEP/NCAR data covering the last 50 years suggest that nearly year-round measurements at 270 GHz will be feasible. Another advantage is the good accessibility of this high altitude location by the worlds highest cable car. A scientific, technical, and organizational summary in pdf-format for this new atmospheric research station can be found at http://www-imk.fzk.de/imk2/mira/Merida/SciSumMe.pdf Pietrosemoli, ICTP Feb 2003 4 MARS Link Requirements: • Provide Internet access at a mountaintop 4765 m altitude • Avoid 2.4 GHz band because of interference • Economic, environment and time constraints Pietrosemoli, ICTP Feb 2003 5 MARS link from Pico Espejo. 4765 m to Hechicera 1800 m Pietrosemoli, ICTP Feb 2003 6 MARS Link • 5.8 GHz band chosen for the availability of less expensive equipment • Altitude posed power dissipation problems that prevented the use of certain gear • Alvarion chosen because of proven track of functioning on Everest Pietrosemoli, ICTP Feb 2003 7 MARS Link • ODU consisting of integrated antenna and transceiver, connected to IDU by means of STP cable (up to 100m) that also provides DC power • LED indicators aid in antenna pointing • IDU provides power and has one RJ-45 connection to 10/100 baseT switch or hub • 10 degrees downtilt required by this link Pietrosemoli, ICTP Feb 2003 8 Pico Espejo, 4765 m, Ermanno Pietrosemoli Pietrosemoli, ICTP Feb 2003 9 Javier Triviño adjusting downtilt with clinometer Pietrosemoli, ICTP Feb 2003 10 Connection to the wired network Hechicera, top of university building, Maricela Guerrero, 1800 m Pietrosemoli, ICTP Feb 2003 11 Professor Pedro Hoffmann sending E-mail from Pico Espejo Pietrosemoli, ICTP Feb 2003 12 MARS view • A webcam has been installed at Pico Espejo that shows an image of the cable car and Pico Bolivar (5000 m altitude) and can be acessed on line at http://www-imk.fzk.de/imk2/mira/home.html Pietrosemoli, ICTP Feb 2003 13