1、 Recommendation ITU-R S.1717-1 (09/2015) Electronic data file format for earth station antenna patterns S Series Fixed-satellite service ii Rec. ITU-R S.1717-1 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency
2、 spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunic
3、ation Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent s
4、tatements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Al
5、so available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related sa
6、tellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time si
7、gnals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2015 ITU 2015 All rights reserved. No part of this publication may be reproduced, by an
8、y means whatsoever, without written permission of ITU. Rec. ITU-R S.1717-1 1 RECOMMENDATION ITU-R S.1717-1 Electronic data file format for earth station antenna patterns (Questions ITU-R 42-1/4 and ITU-R 280/4) (2005-2015) Scope Although the standard reference patterns for FSS and BSS earth station
9、antenna main-beam and side-lobe gain, such as those in Recommendations ITU-R S.465, ITU-R S.580, ITU-R BO.1213 or ITU-R BO.1900 among many others are adequate for many interference studies, cases sometimes arise where more detailed gain patterns for specific antennas, or antenna types are needed in
10、ITU-R studies. Also, the gain data for particular antennas are used in the refinement of existing reference patterns and/or the development of new reference patterns. Annex 1 to this Recommendation details a format in which gain data on specific FSS and BSS earth station antennas may be submitted by
11、 administrations in electronic form, and includes examples. Annex 2 includes a format for the capture of measured gain data of earth station antennas when only elevation and azimuth data is available. Keywords FSS, BSS, electronic data file format, earth station antenna patterns Related ITU Recommen
12、dations, Reports Recommendation ITU-R BO.1213-1 Reference receiving earth station antenna pattern for the broadcasting-satellite service in the 11.7-12.75 GHz band Recommendation ITU-R BO.1900-0 Reference receive earth station antenna pattern for the broadcasting-satellite service in the band 21.4-2
13、2 GHz in Regions 1 and 3 Recommendation ITU-R S.465-6 Reference radiation pattern of earth station antennas in the fixed-satellite service for use in coordination and interference assessment in the frequency range from 2 to 31 GHz Recommendation ITU-R S.580-6 Radiation diagrams for use as design obj
14、ectives for antennas of earth stations operating with geostationary satellites Recommendation ITU-R S.732-1 Method for statistical processing of earth station antenna side-lobe peaks to determine excess over antenna reference patterns and conditions for acceptability of any excess The ITU Radiocommu
15、nication Assembly, considering a) that efficient utilization of the radio spectrum is a primary factor in the management of the GSO; b) that the side-lobe characteristic of earth station antennas is one of the main factors in determining the minimum spacing between satellites and therefore the exten
16、t to which the radio spectrum can be efficiently used; c) that the collection of measured earth station antenna pattern data would allow a continuous improvement of the ITU-R mathematical models for use in sharing studies or as reference patterns for antenna side-lobe limits or off-axis e.i.r.p. lev
17、els; 2 Rec. ITU-R S.1717-1 d) that a defined file format for the submission of measured earth station antenna pattern data would be useful for the analysis of these data by the Radiocommunication Study Groups; e) that this file format should be sufficiently general to support data on different cut p
18、lanes, angular ranges and polarization types of antenna patterns, recommends 1 that the file format contained in Annex 1 may be used for the collection of electronic data containing information on FSS or BSS earth station antenna radiation patterns for further studies concerning the modelling of the
19、 radiation patterns; 2 that the file format in Annex 2 may be used for cases when measurement data are only available in the azimuth and elevation planes. NOTE 1 Recommendation ITU-R S.732 may be used as guidance for the choice of an adequate number of points to achieve the necessary angular resolut
20、ion in each electronic data file. NOTE 2 Further studies may be required for the establishment of antenna measurement procedures. NOTE 3 The electronic databank containing antenna measurements submitted to ITU-R is available at http:/www.itu.int/itu-r/go/rsg4/recs1717data/. Annex 1 Electronic file f
21、ormat for earth station antenna pattern data 1 Generic description The basic file types considered here are block structured. These data blocks are detailed in the next sections. In all files, HEADER has to be formatted in accordance with: Line Description/content 1 Title 2 Comments 3 Comments 4 Fil
22、e identification code Maximum number of characters: title: 52 characters comments: 80 characters. NOTE 1 Such comments lines are reserved for information related to the content of the file and or its purpose (e.g. antenna model or configuration). Rec. ITU-R S.1717-1 3 1.1 File identification code Co
23、de File type 200 3D fields co-polar, cross-polar NOTE 2 Different codes can be further proposed to identify other field representations. 1.2 Block-structured files For the block-structured files a fifth row has to be used containing the total number of blocks. Line Description/content 5 Total number
24、 of blocks After row five the sequence of blocks is included with the main function data. A single file block has a generic structure as following: Control line n m a1,1 a1,2 . a1,m a2,1 a2,2 . a2,m . . . . . . . . an,1 an,2 . an,m where: Control line: contains relevant data concerning the specific
25、block (see details in the following sections) n: number of block rows m: number of block columns. 1.2.1 File general structure The general structure of a block-structured file is described as following: 1Title 2Comments header 3Comments 4File identification 5Number of blocks control line of block 1
26、n1 m1 a1,1 a1,2 . a1,m . . . . block 1 . . . . an,1 an,2 . an,m 4 Rec. ITU-R S.1717-1 control line of block f nf mf a1,1 a1,2 . a1,mf . . . . final block . . . . anf,1 anf,2 . anf,mf 2 3D fields block-structured files In this section the content of field data is described for the file type 200 (3D f
27、ields co-polar and cross-polar). See Fig. 1 as a reference for parameters described below: Title Comments Comments id pol orientation freq Number of blocks b l o c kr,Xr,Xr,Cor,Co:.r,Xr,Xr,Cor,Co:mnrjknjknjknjknnjkjkjkjkjk)()()()()()()()( 11111where: id: file identification, is 200 pol: antenna pola
28、rization, assumes values 1 (linear); 2 (circular/elliptical) or 0 (non-determined), orientation: when pol = 1, orientation indicates plane which contains the main component of the electric field (preferably 0 for horizontal polarization and 90 for vertical polarization); when pol = 2, orientation is
29、 1 (for left-hand circular/elliptical polarization), or 2 (for right-hand circular/elliptical polarization); For non-determined cases use pol = 0 and orientation = 0. freq: frequency (GHz). Not relevant in case of general side-lobe masks or envelops. k: pattern cut half plane angle (degrees), relate
30、d to block data, (use = 90 for upper elevation cut). Varies from 0 to 360. i: Angular direction (degrees) relative to the antenna boresight (i = 0) which shall indicate satellite pointing and maximum gain direction. rj: radial distance r (m) related to specific block, (this value can be suppressed i
31、f data relates to far-field region). Rec. ITU-R S.1717-1 5 n: number of block rows, i.e., number of i samples (where varies from 0 to 180). Value of n shall be adequate to allow pattern resolution for data plotting or for use in coordination and interference calculations. m: number of block columns
32、(for the 200 type file m = 5), Co(i, k, rj): co-polar field amplitude (dB or dBi), at the point (i, k, rj), Co(i, k, rj): co-polar field phase (degrees), at the point (i, k, rj), X(i, k, rj): cross-polar field amplitude (dB or dBi), at the point (i, k, rj), X(i, k, rj): cross-polar field phase (degr
33、ees), at the point (i, k, rj), When amplitudes are indicated in dB, the antenna maximum gain (dBi) value must be supplied (use comments lines). When phase values are not available or not relevant, insert 0.0 (not blanks). FIGURE 1 Example of reflector antenna in a spherical coordinate system as per
34、the proposed standard file format S. 1 7 1 7 - 0 1No t e 1 A n ten n a u p p er el ev at io n h al f- p lan e s h al l b eco i n ci d en t w i t h + y z h al f- p l an e ( = 9 0 ) zxyr3 Examples In this section a pattern data file is illustrated as an example as well as some resulting applications.
35、Table 1 shows some parts of the example file containing four blocks with n = 360 rows in each and representing the radiation pattern cut planes k equal to 0, 90, 180 and 270 respectively. 6 Rec. ITU-R S.1717-1 TABLE 1 Example of a measured radiation pattern file in the proposed format Title Offset a
36、ntenna XXX 1.8 m Measured frequency 14 GHZ EL/H Pol H Comments Model BO 05355 Comments Original MI 2095 file:F:XXXHCOHELTX.TXT id pol orientation freq 200 1 0 14.000 Number of blocks 4 0 360 5 0 46.13 132.131 1.976 48.183 0.5 42.503 119.138 3.083 63.6 1 29.327 86.983 3.126 48,484 1.5 20.601 9.116 5.
37、148 7.781 2 15.948 81.549 23.206 86.305 2.5 7.158 60.242 17.033 89.719 . 177.5 5.305 143.914 34.487 175.838 178 5.006 14.855 17.404 86.68 178.5 5.433 130.715 20.464 158.715 179 5.928 77.425 29.24 9.018 179.5 5.846 65.336 30.317 123.385 90 360 5 0 46.13 38.426 14.575 14.098 0.5 43.405 40.238 22.746 1
38、65.781 1 32.697 24.047 20.087 168.983 1.5 22.179 36.461 0.228 71.216 2 2.554 17.435 4.258 99.239 2.5 15.386 165.509 0.391 161.129 . Figure 2 illustrates the graphical representation of the co-polar field pattern measured in the cut plane k = 0o (1st block/2nd row). In this case, this cut-plane corre
39、sponds to one side of the azimuth plane and the polarization is horizontal. In Fig. 2 a reference pattern envelope is represented based on Recommendations ITU-R S.580 and ITU-R S.465 for the co-polar pattern side-lobes. Rec. ITU-R S.1717-1 7 FIGURE 2 Co-polar field measured pattern example in the k
40、= 0 (Az/Pol H) S. 1 7 1 7 - 0 2(d eg re es )(dBi)05040302010010203040506020 40 60 80 100 120 140 160 180Annex 2 Recommended electronic file format for receiving earth station antenna pattern data when measurement data is only available in the azimuth and elevation planes The file type 200 described
41、in 2 of Annex 1 is applicable for a pattern data file with some simplifications as illustrated below by an example in Table 2: 1) Radiation pattern cut planes k equal to 0 and 90 are fully sufficient assuming an approximate symmetry of the radiation diagram that is why the pattern data files may con
42、sist of two blocks. 2) Each block may contain rows n = 200 to 220 instead of 360 when measurements cover only the angular sector from 0 to 100 (110) as the back lobes in most of the cases are not relevant. 3) Measured data relates to far-field region. 4) Phase values are not relevant. 8 Rec. ITU-R S
43、.1717-1 TABLE 2 Example of a measured radiation pattern file in the proposed format Title Offset antenna DCE-73 0.7 m 0.5 m Measured frequency 11.725 GHz Pol V Comments Type: Single off-set system Max gain: 35.6 dBi Comments Original file: BUL BSS antenna patterns.xls id pol orientation freq 200 1 9
44、0 11.725 Number of blocks 2 0 201 5 0 0 0.0 39.6 0.0 0.5 0.7 0.0 26.9 0.0 1 2.7 0.0 22.1 0.0 1.5 6.2 0.0 20.6 0.0 2 11.5 0.0 21.2 0.0 2.5 21.6 0.0 23.8 0.0 . 98 42 0.0 52.8 0.0 98.5 42.1 0.0 54.9 0.0 99 42.6 0.0 50.5 0.0 99.5 43.4 0.0 54 0.0 100 45.4 0.0 54.5 0.0 90 201 5 0 0 0.0 39.2 0.0 0.5 0.6 0.
45、0 42.5 0.0 1 2 0.0 52.8 0.0 1.5 4.6 0.0 54.9 0.0 2 7.8 0.0 53.3 0.0 2.5 11 0.0 52.9 0.0 . The submission to the databank associated to this recommendation of more recent patterns (co- and cross-polar) measured data (tabular and graphical) of small antennas with different design is important for stud
46、ies on improving the reference antenna patterns for different services and frequency bands. It is advisable that the graphical representation of the co-polar/cross-polar field pattern measured in both cut planes includes the applicable reference pattern envelope. Figure 3 illustrates the graphical r
47、epresentation of the co-polar field pattern measured in the cut plane k = 0 (1st block/2nd row) corresponding to the example measured data in Table 2. In Fig. 3 a reference pattern envelope is represented based on Recommendation ITU-R BO.1213. Rec. ITU-R S.1717-1 9 FIGURE 3 S. 31 7 1 7 - 0Relativean
48、tennagain(dB)Co -p o l ar mes u red p at t ern i n t h e cu t p l an e = 0 (A z/ Po l V )ko f BSS ea rt h s t at i o n an t en n a D CE -7 3 at 1 1 . 7 2 5 G H zCo -Po l Cu t = 0 , mea s u redCo -Po l IT U -R BO . 1 2 1 3O ff ax i s an g l e (d eg ree s )7060504030201000 . 1 1 . 0 1 0 . 0 1 0 0 . 0_
