The Radiocommunication Data Dictionary (RDD) ITU-R SM.1413 Presented by David Barrett

Presentation Overview The objectives of the RDD An introduction to the contents of the RDD Future development Converting the RDD into MS Access (by Mr Neelesh Kulkarni) The Reference Database (by Mr Fabrice Evangelisti)

The RDD contains all the data required for the international filing process clear and consistent descriptions of the data and its format definition of the conditions of use by radio system(s) identification of notification process constraints

The RDD provides a tool for improving the exchange of data between administrations and between administrations and the Bureau a tool that can be used to improve aspects of the international filing process by providing:  data validation rules (more to be added)  an opportunity for administrations to review and propose the rationalisation of duplicated and redundant data

The RDD enables identification of individual data items the structure of the data to be presented administrations to overcome the problems of  diversity of terminology and concepts across frequency bands and Services  inconsistent and incomplete definitions located in many different documents

The RDD assists development of more comprehensive validation tools development of forms and Circular Letters staff training mapping national databases to the international data requirements overcoming problems for staff not working in their own language

RDD Contents Section 1: Introduction Section 2: Terrestrial Notification Data Section 3: Description of Terrestrial Data Items Section 4: Space Advance Publication, Notification and Coordination Data Section 5: Description of Space Data Items Section 6: Data Item Formats Section 7: Diagrams Section 8: Cross-Reference Tables between RR Appendix S4 and RDD Section 9: Appendices Section 10: Data Item Reference Index

Example Data Item  Apogee AltitudeRDD ref: S098 The longest distance from a point on the Non-geostationary Orbit to the sub-satellite point on the Earth’s surface. For the purpose of this measurement the Earth is considered to be a spherical body with no height variation and a nominal radius of 6378 km. The sub satellite point is the point on a line between the apogee and the Earth’s centre where it passes through the earth’s surface. The term “apogee” is commonly used when the Earth is the reference body and may vary if a different reference body is used e.g. “aphelion” when the reference body is the sun. A more generic term that may also be used is “apoapsis”. Format: Integer (in the range 500 to ) in km.

Example Data Group Administration RDD ref: S001 A governmental department, or service, of a member state of the ITU responsible for discharging the obligations undertaken in the Constitution, the Convention and the Regulations of the ITU.  An Administration is identified by its Code. An Administration may be party to one or more Coordination Agreements RDD ref: S002 An Administration may submit one or more Correspondence Addresses RDD ref: S006

Example Section 4 Data Sheet

Future plans for development updating to include changes introduced at WRC2000 expansion of the Data Validation Rules improved guidance inclusion of the Bureau findings introduction of hyperlinks