IMPROVED QUALITY OF SERVICE IN IONOSPHERIC TELECOMMUNICATION SYSTEMS PLANNING AND OPERATION

Projektinformationen

IITS

ID Finanzhilfevereinbarung: 251

Startdatum 7 April 1995

Enddatum 6 April 1999

Finanziert unter

• European cooperation in the field of scientific and technical research (COST), 1971-

Gesamtkosten € 4 200 000,00

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Koordiniert durch

Rutherford Appleton Laboratory (RAL)
United Kingdom

Ziel

The main objectives of the Action, embodied in the MoU, are :
to demonstrate the practical improvement to terrestrial and Earth-space radio systems of COST 238 derived ionospheric models and to promote their use ;
to further refine these models and to widen their geographical area of applicability between latitudes of 35-70 N and longitudes of 10 W-60 E ;
to collect additional quantities and types of ionospheric information and to extend the models to give system performance statistics.
Main results
During the first year, the activities of COST 251 were focused on the preparation of the Work Package list and the Project Time scales. The first months of the year 1996 has been used more specifically to define precisely the scientific content and the limits of the Action.
The first version of the COST 251 data bank on a CD is made available for distribution by RAL. This CD currently contains scaled vertical incidence parameters for 37 stations in the COST 251 region for the years 1957-1994.
Current status
Method of Working
For the past years COST 238 has been engaged in the development of improved ionospheric models for Europe. The present Action builds on the results of COST 238 by establishing a programme of work that will test the operational value of the new ionospheric models for terrestrial and Earth-space systems. Following a review of requirements for models improved over those currently available internationally, it will seek to collect additional and new types of data and will further refine and widen the latest ionospheric models and aim to produce a methodology for channel simulation for HF systems in Europe and a model, or models, for overall performance prediction of fixed frequency or adaptive systems in Europe. Models will include consideration of service requirements, ionospheric variability, noise, interference, and channel availability, whilst taking into account the impact of the medium on system design.
Project structure
The Action runs on the basis of two Management Committee meetings a year, each lasting one and a half or two days. It involves the participation of 73 scientists and engineers from 37 organisations in 16 countries. The work is organised as a series of Work Packages (WPs) structured within five Working Groups (WGs) as follows.
Chairman : R Hanbaba, France Telecom CNET, Lannion (F)
Vice-Chairman : B Zolesi, Ist Nazionale di Geofisica, Rome (I)
Working Group 1 - Models for terrestrial systems
WG Leader : S Kouris, Aristotelian University of Thessaloniki, Greece
interaction with radio users and comparison of their performance data with model results, including if possible assessment of the value of real-time channel evaluation techniques ;
collection of additional vertical and oblique-path ionospheric data for use with instantaneous maps.
Working Group 2 - Models for earth-space systems
WG Leader : R Leitinger, University of Graz, Austria
investigation of ionospheric propagation effects on radio systems used for navigation, geodesy and radio-astronomy.
Working Group 3 - Ionospheric modelling
WG Leader : L R Cander, Rutherford Appleton Laboratory, Didcot, UK
monthly median and instantaneous mapping techniques ;
electron -density height profile modelling ;
computer program development.
Working Group 4 - System Performance and Spectrum Management
WG Leader : L Barclay, Lancaster University, UK
WG V-Leader : B Lundborg, National Defence Research Establishment, Sweden
signal variability and correlation ;
background noise and interference ;
HF channel models and simulators ;
performance prediction ;
real-time frequency management.
Working Group 5 - Variability and Forecasting
WG Leader : S M Radicella, ICTP, Trieste, Italy
improve prediction of ionospheric variability parameters of interest to HF system planning and operation in high latitude ;
investigate and improve ionospheric forecast for HF system operation.
Activities Completed
A Work Package was initiated at the 2nd Management Committee meeting to work on writing the PRIME-1 computer program. Three tasks were undertaken :
check for the correctness of mapping and modelling programs,
recognise errors and problems in the user interface and propose solutions,
prepare propositions of graphical presentation of the results.
The sub-group has completed the work and the outcome has been presented at a Management Committee meeting.
Work planned
Successful Action outcome involves the publication of a Final Report to include the following recommended information :
mapping functions and associated coefficients for the monthly median ionospheric characteristics foF2, M(3000)F2 and the Total Electron Content (TEC);
spatial-interpolation algorithms for instantaneous values of foF2, M(3000F2) and TEC from measured data for the same epoch;
forecasting algorithms for estimating values of foF2, M(3000F2) and TEC for up to 24 hours ahead;
expressions for the height profile form in terms of values of foF2, M(3000F2), TEC and other available ionospheric and solar-geophysical parameters as necessary;
methodology for channel simulation for HF systems in Europe; model, or models, for users for overall performance prediction of fixed frequency or adaptive systems in Europe ; models will include consideration of service requirements, ionospheric variability, noise, interference and channel availability whilst taking into account the 'Impact of the medium on system design';
computer programs in accordance with the recommended procedures.

Programm/Programme

• IC-COST - European cooperation in the field of scientific and technical research (COST), 1971-

Thema/Themen

• 1 - Telecommunications

Aufforderung zur Vorschlagseinreichung

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Finanzierungsplan

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Koordinator

Rutherford Appleton Laboratory (RAL)

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• Adresse: Chilton ; OX11 0QX Didcot ; Vereinigtes Königreich
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Beteiligte (1)

Chairperson

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