|
|
|
|
|
|
|
![]() |
CEPIT HISTORY 1987, June 3: CEPIT group is founded at Politecnico di Milano during the Workshop on Italsat Propagation Experiment. The members are potential experimenters from 8 European countries and Canada, including 5 Telecoms (Germany, Sweden, UK, NL, Denmark), 5 Universities and 4 equipment suppliers, as well as representants of ESA/ESTEC, EUTELSAT, Piano Spaziale Nazionale, Selenia Spazio and Telespazio. Prof. Aldo Paraboni, as one of main promoters of Italsat Experiment, and among scientific leaders of propagation community becomes naturally the CEPIT Chairman, in charge since then. 1991, January 15: the ITALSAT launch. The flying unit F1 is placed in geostationary orbit, at 13.2º East with the lifetime plan of 5 years. The propagation payload features 3 beacons, at 20, 40 and 50 GHz, the communication payload is operating at 20 and 30 GHz (see Italsat specs). 1992 , April 1-2: CEPIT II meeting is held in Milano and Spino d'Adda, organized by CSTS CNR, with the partecipation of ASI, Alenia Spazio, Telespazio, OPEX, ESA/ESOC, and experimenters from Austria, Germany, Norway, France, UK and Italy (FUB-Roma, CSELT-Torino, CSTS CNR- Politecnico di Milano).Proceedings available at CPT2PROCs 1993-1994: Italsat Chapter is hosted at OPEX (Olympus Propagation Experiment) and NAPEX (National American Propagation Experiments) meetings. 1995, October 9: CEPIT III meeting is held in Rome, as a part of the Italian Propagation Day. It is attended by 50 people and features 24 speakers. The venue and the date are arranged to give the participants the opportunity to attend the first "Ka BAND UTILIZATION CONFERENCE" held in Rome on October 10-12. Proceedings available at CPT3PROCs 1996, August 8: the launch of the ITALSAT F2 , second flying unit, placed in geostationary orbit at 16.4° East, designed for Italian coverage, carrying communication 20/30 GHz payload and 20GHz telemetry beacon . 1996, September 23: CEPIT IV meeting is held in Firenze, hosted by the CNR IROE, the day before the SECOND Ka BAND UTILIZATION CONFERENCE : among attendees are 12 active experimenters, still some new projects are starting; ASI announces Italsat F1 to remain in orbit over 1998 and more (hopefully end of millennium) with propellant saving option: this implies that N-S axis will be not more controlled within a box; a good tracking procedures will be necessary. Proceedings available at CPT4PROCs 1997, September 16-17: CEPIT V meeting is held in Sorrento within the program of THIRD Ka BAND UTILIZATION CONFERENCE; ASI and Telespazio confirm the possibility of keeping the F1 in orbit until the end of the century, with propellant saving option.Proceedings available at CPT5PROCs 1998, November 2-4: CEPIT VI meeting is held in Venice as a session of the FOURTH Ka BAND UTILIZATION CONFERENCE. Proceedings available at CPT6PROCs 1999, October 19: CEPIT VII meeting is held in Taormina, Sicily, traditionally hosted by the (FIFTH) Ka BAND UTILIZATION CONFERENCE. Proceedings available at CPT7PROCs 2000, June 2: CEPIT VIII meeting is held in Cleveland, Ohio, USA, hosted by the SIXTH Ka BAND UTILIZATION CONFERENCE. We participate to the celebrations of the ACTS program and the decomissioning ceremony of the ACTS spacecraft. ASI confirmes Italsat F1 in excellent shape and in orbit at least for one more year. Measurments are still carried out in Madrid, at RAL - Sparsholt/Chilbolton (UK), Milano, and Rome. Proceedings available at CPT8PROCs 2001,CEPIT IX meeting is held within the SEVENTH Ka BAND UTILIZATION CONFERENCE on September 27 at the Congress Center of the Grand Hotel Miramare, in Santa Margherita Ligure (adjacent to the famous Portofino), Italy . Proceedings available at CPT9PROC 2001, January 26 : END OF ITALSAT F1 MISSION ASI declairs the END OF ITALSAT F1 MISSION. The official communication faxed on Friday, January 26, states that "the satellite reached the end of its activity due to the lack of fuel. The final manouvres aiming to move the spacecraft away from the nominal position in geostationary orbit will start on January 29, 2001 at 9:00. At 16:30 of the same day the payloads will be gradually shut off". 2002, CEPIT X (last) meeting is held within the EIGHTH Ka BAND UTILIZATION CONFERENCE, on September 25 in Baveno, Lago Maggiore, Italy, jointly with EXPRESS group of experimenters for French satellite STENTOR. Proceedings available at CPT10PROCs . |
| Organization | Country | Measurements |
| SERC - RAL Rutheford Appleton Laboratories (active) | U. K. | 20, 40 and 50 GHz co-polar |
| FUB - Fondazione Ugo Bordoni Roma (active) | Italy | all beacons, all polariz. |
| CSTS-CNR Politecnico di Milano (active) | Italy | all beacons, all polariz. |
| Universidad Politecnica de Madrid (active) | Spain | 50 GHz co- and cross-polar, V&H |
| CSELT Torino -Telecom | Italy | all beacons, all polariz.,20 GHz mob |
| DLR - Aerospace Research Oberpfaffenhoffen | Germany | 40 and 50 GHz |
| TZD Darmstadt | Germany | 20 and 40 GHz copolar |
| EUT Eindhoven University of Technology | Netherlands | 40 GHz cp 50 GHz co- and cross-polar |
| University of Portsmouth | UK | 40 GHz copolar |
| Telenor Research Kjeller | Norway | 50 GHz copolar |
| IRAM - Institut de Radioastronomie Millimetrique | France | 40GHz copolar |
| CAY Centro Astronomico de Yebes Guadalajara | Spain | 50 GHzcopolar |
| University of Surrey / ESTEC | UK | 20 GHz mobile terminal |
| ESTEC/ IAS Graz | Austria | 20 GHz mobile terminal |
| CERT - ONERA Toulouse | France | earth terminal tests |
Tab. 2. RAIN RATE (MM/H)
AT 0.01% OF THE YEAR
AT SITES OF ITALSAT
PROPAGATION EXPERIMENT
![]() |
|
CEPIT: ITALSAT EXPERIMENTERS 1992-2000
|
The DB-CEPIT collects yearly and monthly statistics of main propagation parameters, like Attenuation, XPD, Rain Rate, Scintillations etc. stored in form of levels exceeded for fixed year’s percentage (in the range of 0.01 - 50 %). The software for generation, keeping and using the data base is the one developed by the ESA-ESTEC for the Olympus Propagation Experiment DB-OPEX, available to the propagation researchers upon request, free of charge. The data already included and potentially available are listed in Table 2. Those currently included cover 25 years of attenuation and rain rate. Lots of entries is expected in the next future coming from current and future measurements, and from the data still under processing. The main contributors are by now the stations of Spino d’Adda (17 years), Chilbolton (6 years), Darmstadt (6 years), Eindhoven (2 years). |
| Organization | Att18.6 GHz | Att.40 GHz | Att. 50 GHz | Other measurements carried out |
| Politecnico di Milano | 72 | 72 | 60 | all XPD's, radioms at 13, 23, 31 GHz , raing.15 years, fades, scintillations |
| CSELT
Torino |
12 | 12 | 12 | all XPD's, radioms at 13, 23, 31 GHz, raing., fades, scintillations |
| RAL-Chilbolton | 12 | 24 | 36 | radiom. 51 GHz, raing. |
| TDZ Darmstadt | 36 | 36 | radioms at 13, 23, 31 GHz, raing., fades, scintillations | |
| EUT Netherl | 24 | raing., fades, |
| Organization | Att18.6 GHz | Att.40 GHz | Att. 50 GHz | Other measurements / notes |
| FUB Roma | 3 years | 3 years | 3 years | all XPD's, radioms at 13, 23, 31 GHz, raingauges, fades, scintillations |
| DLR Germany | 4 years | 4 years | raing., fades | |
| Univ. Politecnica Madrid | 6 mnth | |||
| Univ. of Portsmouth UK | 12 (?) | scintil., fades | ||
| TeleNor Kjeller Norway | 9 mnth | raing, fades |
![]() |
| CEPIT Coordinator:
Dr Apolonia Pawlina CSTS-CNR |
CEPIT Chairman:
Prof. Aldo Paraboni Politecnico di Milano |