C    E    P    I    T
C OORDINAMENTO E SPERIMENTO DI  PROPAGAZIONE ITALSAT 


CEPIT NAME AND GOALS
The name is  an acronym of  Italian expression  "Coordinamento dell'Esperimento di Propagazione Italsat", and refers to  the group of people and organizations involved in the ITALSAT Propagation experiment.ITALSAT is an Italian satellite owned by  the Italian Space Agency ASI  , in geostationary orbit  at 13.2º East since 1991, carrying both  propagation and communication payloads.  The scientific management of the propagation experiment was assigned to the Centro di Studio per le Telecomunicazioni Spaziali CSTS of   CNR   (National Research Council) at  Politecnico di Milano . CSTS is  also one of main participants to the experiment, carried out at the station of  Spino d' Adda  .

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 .


 
 
 
 
 
 

Table 1. CEPIT Experimenters update May 2000

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


Tel-Nor  17.0
RAL-UK  25.0
EUT NL  26.1
Uni-Port UK  26.3
FTZ Darmst  28.2
DLR Germ  29.9
Spino  31.7
Turin  32.3
Rome  36.8
Barcel  40.4
Madrid  41.9
C.A.Y  41.8
IRAM 
43.9

 
 
 
 

CEPIT: ITALSAT EXPERIMENTERS 1992-2000


ORGANIZATION GROUND TERMINAL LOCATION ANTENNA TRACKING ANALYSIS
DLR, Germany 48.1° N, 11.3° E, elev. 34.8°
Oberpfaffenhoffen (Munich)
2.4m Gregory offset Step by step hourly 40 & 50 GHz Att, yearly, monthly, hourly, 3dB durations, fade slopes 
RAL, UK 51.8 N, 358.61 E, elev. 29.9º Chilbolton and Sparsholt   In elevation Att. yearly, seasonal, diurnal, all 3 freq.
Poli tecnico di Milano, Italy 45.4° N, 9.5° E, 84m a.s.l., elev. 37.8° Spino d’Adda (Milano) 3.5 m, Cassegrain Monopulse N-S and E-W All
Politecnica de Madrid, Spain 40º 27’ N, -3º 43’ W, 650 m, elev. 40.14º, Madrid 1.2 m Automatic in elev. and azim. 50 GHz , V&H, all
FUB, Italy 41.52 N, 12.37 E, elev. 41.8, Rome 3.5 m, Cassegrain Monopulse N-S and E-W  
EUT, Netherlands 51.45N, 5.49E, 18m asl, Eindhoven 0.5m corr.horn, Cassegrain   40GHz, 3mnth 50 GHz, diurnal, seasonal, fades
Deutsche Telekom, Germany 49.87N, 8.62 E, 180m asl, Darmstadt 3.7m for 18.6GHz, 0.6m for 39.6 GHz 3.7m steerable

0.6m fixed

18 and 40 GHz
University Portsmouth, UK 50.78N, -1.09E, Portsmouth 0.5m lens-horn  "predictive", in N-S, since Jan 98 40 GHz, 96-97
CSELT, Italy 45.1 N, 7.52 E, 230 m asl, Turin 3.5 m, Cassegrain Monopulse N-S and E-W  
Telenor, Norway 59.56N, 10.41E, elev. 22º, Kjeller (20 km N-E of Oslo) 1.2 m, offset parabolic None 50GHz, V&H, 1997-1999
IRAM, France 37.06N, 3.4 W, 2920m asl, Pico Veleta, Sierra Nevada 30m Cassegrain Radio telescope   40GHz used for phase retrieval holography
Poli Madrid 40.38N, 3.10W, elev. 40.2 Guadalajara 14m Cassegrain

Radio telescope

Program following orbital predictions 50 Ghz event based evaluation 
C.A.Y., Spain 40.38N, 3.10W, elev. 40.2 Guadalajara 14m Cassegrain Radio telescope Program following orbital predictions 50 Ghz used for phase retrieval holography
ESA-ESTEC, Joanneum Austria Mobile, several locations in Europe, e.g. Graz, Surrey     Mobile Ka band propagation 

 
 
 
 
DB-CEPIT: ITALSAT  PROPAGATION DATA BASE, MAY 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). 

 
 

Table 2. DB-CEPIT: ITALSAT PROPAGATION DATA BANK
Months of data (update February 2000)
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,

 

POTENTIAL SUPPLIERS OF DATA TO DB-CEPIT

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 IV Meeting participants at  IROE-CNR in Florence, Sept. 96 
Photo by Enzo Capannini
 



 
CONTACT PERSONS
CEPIT Coordinator:
Dr Apolonia Pawlina
CSTS-CNR
CEPIT Chairman:
Prof. Aldo Paraboni
Politecnico di Milano


Last update: October 2002
Site  keeper :   pawlina@elet.polimi.it
Italsat drawing by Francesco Zaccarini