ITU-R - International Telecommunication Union/ITU Radiocommunication Sector
Scope
Introduction Recommendation ITU-R BO.1443?? Reference BSS earth station antenna patterns for use in interference assessment involving non-GSO satellites in frequency bands covered by RR Appendix S30@ describes broadcasting-satellite service (BSS) reference antenna patterns to be used in non-geostationary-satellite service (non-GSO) interference analyses. Of particular interest are small@ offset-fed BSS earth station antennas which have non-axially symmetric patterns. Millions of these antennas have been deployed worldwide. To support the development of these antenna reference patterns several Sector Members performed detailed measurements@ analyses and modelling of three-dimensional antenna patterns. A Special Rapporteur Group was formed to collect and organize the extensive data sets and analyses performed during the development of the Recommendation described above. It was felt that information of this nature would be valuable in future BSS studies. The three tasks assigned to the Special Rapporteur were: ?? Collect antenna measurement data and analyses performed by administrations during development of the Recommendation cited above. ?? Prepare a summarizing report describing the antenna measurements analyses and catalogue the relevant data on one or more CD-ROMs. ?? Compare the submitted measured data with the three-dimensional reference antenna patterns contained in Recommendation ITU-R BO.1443. To accomplish these tasks@ data from administrations was solicited via e-mail. Data was received from the United Kingdom@ Canada and Telenor@ and is summarized in the following sections. This Report is organized as follows. Section 2 describes the basic geometry and coordinate system for the antenna measurements. A brief summary of the measurements is also provided. Sections 3@ 4 and 5 describe the antenna measurements and analyses performed by the United Kingdom@ Telenor@ and Canada@ respectively. A subset of the data is plotted in gain vs. azimuth angle format; in several cases@ polar plots are also provided. Plots comparing the measured data with the reference antenna patterns in Recommendation ITU-R BO.1443 are provided for some of the data sets. Section 6 describes the text and data file layout on the CD-ROM. Data was submitted as either Microsoft Excel spreadsheets or as ASCII files. This Report@ the data sets provided@ the spreadsheets containing the graphical analysis performed by the Special Rapporteur Group@ and the spreadsheets used to plot the reference antenna patterns from Recommendation ITU-R BO.1443 are included on the CD-ROM.