1、 Recommendation ITU-R SA.1159-4 (07/2017) Performance criteria for data transmission systems in the Earth exploration-satellite service and meteorological-satellite service SA Series Space applications and meteorology ii Rec. ITU-R SA.1159-4 Foreword The role of the Radiocommunication Sector is to e
2、nsure the rational, equitable, efficient and economical use of the radio-frequency 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
3、of the Radiocommunication Sector are performed by World and Regional Radiocommunication 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
4、 in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements 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
5、patent information database can also be found. Series of ITU-R Recommendations (Also 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
6、 (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite 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 fi
7、xed service systems SM Spectrum management SNG Satellite news gathering TF Time signals 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, 2017
8、ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R SA.1159-4 1 RECOMMENDATION ITU-R SA.1159-4 Performance criteria for data transmission systems in the Earth exploration-satellite service and meteorologi
9、cal-satellite service (Question ITU-R 141/7) (1995-1997-1999-2006-2017) Scope This Recommendation specifies the performance objectives for data transmission systems of the Earth exploration-satellite service (EESS) and meteorological-satellite service (MetSat) operating either in low-Earth orbit (LE
10、O) or in geostationary orbit. Keywords EESS, METSAT, non-GSO satellites, GSO satellites, data transmission, interference criteria Related Recommendations and Reports Recommendations ITU-R SA.1020, ITU-R SA.1627 and ITU-R SA.1021 The ITU Radiocommunication Assembly, considering a) that the hypothetic
11、al reference system specified in Recommendation ITU-R SA.1020 defines space-to-Earth links for data transmission, encompassing direct readout of data acquisition of recorded data, as well as links for data dissemination, and direct data readout, data collection and data collection platform (DCP) int
12、errogation by satellite; b) that performance objectives for these transmissions must be consistent with the attendant functional requirements and with the performance limitations associated with the systems and frequency bands in which the requirements will be fulfilled; c) that performance objectiv
13、es for representative systems operating in the Earth exploration-satellite service (EESS) and meteorological-satellite service (MetSat) are intended to provide guidelines for the development of actual systems; d) that performance objectives may be determined using the methodology described in Recomm
14、endation ITU-R SA.1021; e) that the performance objectives are a prerequisite for the determination of interference criteria; f) that Recommendation ITU-R SA.1627 contains the telecommunication requirements and characteristics of EESS and MetSat systems for data collection and their platform locatio
15、ns, recommends 1 that links associated with data transmission systems in the EESS and MetSat using satellites in low-Earth orbit (LEO) should have the performance objectives specified for the frequency bands in Table 1; 2 Rec. ITU-R SA.1159-4 2 that links associated with data transmission systems in
16、 the EESS and MetSat service using satellites in geostationary orbit should have the performance objectives specified for the frequency bands in Table 2. TABLE 1 Performance objectives for links in the EESS and MetSat service using LEO satellites Frequency band Satellite service Modulation Applicabl
17、e elevation angle (degrees) Minimum C/N or maximum BER Percentage of time (%) Function and type of earth station 137-138 MHz (space-to-Earth) MetSat Analogue 25 10 dB 99.9 Direct data readout, low-gain antenna MetSat Digital 5 106 99.9 Direct data readout, tracking antenna MetSat Digital 5 105 99.6
18、CDA station, tracking antenna 400.15-401.00 MHz (space-to-Earth) MetSat Digital 5 106 99.9 Direct data readout, low-gain antenna 401-403 MHz (Earth-to-space) MetSat and EESS Digital 5 105 99.6 Data collection, low-gain antenna 460-470 MHz (space-to-Earth) MetSat and EESS Digital 5 105 99.6 DCP inter
19、rogation, low-gain antenna DCP data, tracking antenna 1 670-1 710 MHz (space-to-Earth) MetSat and EESS Digital 5 103 99.99 Direct data readout and recorded data acquisition, low-rate data, tracking antenna Digital 5 106 99.9 2 200-2 290 MHz (space-to-Earth) EESS Digital 5 106 99.6 DCP data, Tracking
20、 antenna Rec. ITU-R SA.1159-4 3 TABLE 1 (end) Frequency band Satellite service Modulation Applicable elevation angle (degrees) Minimum C/N or maximum BER Percentage of time (%) Function and type of earth station 7 750-7 900 MHz (space-to-Earth) MetSat Digital 5 103 99.99 Recorded data acquisition, h
21、igh-rate data,tracking antenna MetSat Digital 5 106 99.9 8 025-8 400 MHz (space-to-Earth) EESS Digital 5 103 99.99 Direct data readout and recorded data acquisition, tracking antenna Digital 5 106 99.9 Recorded data acquisition, tracking antenna Digital 5 105 99.0 Direct data readout, tracking anten
22、na 25.5-27.0 GHz (space-to-Earth) EESS Digital 5 105 99.9 Direct high-speed data readout and recorded data acquisition, stored mission data Notes to Table 1: NOTE 1 In Table 1, for the band 137-138 MHz, the elevation angle of 25 and other parameters for analogue receivers correspond with a level of
23、performance that is guaranteed by designers of some systems. The parameters for the digital receivers correspond with user requirements. NOTE 2 The EESS is only allocated in the 1 690-1 710 MHz portion of the band. NOTE 3 Additional performance objectives could be specified for an availability of 99
24、.99% of the time in relation to the need to synchronize the receiver to the data transmission frames and to avoid bit slips within a frame. However, for the purpose of deriving interference criteria, these objectives can be assumed to be met if the objectives associated with the above specified lowe
25、r availability levels (Table 1) are met. NOTE 4 In all cases in Table 1, it is assumed that earth station sites are selected to yield average levels of environmental radio-frequency noise within the band. For direct data readout stations, which may be deployed in large numbers by various operating e
26、ntities, there is a risk that randomly selected sites will exhibit higher than average levels of environmental noise (especially man-made noise) that may hamper the ability to achieve the stated performance objectives. However, the variance of this noise over all locations is not large in relation t
27、o receiver thermal noise, even at frequencies as low as 137-138 MHz, such that the performance objectives can generally be met at over 95% of the possible locations given link power margins of a few decibels. In the case of recorded data acquisition stations, sites are carefully selected to avoid am
28、bient noise levels that exceed the average level. 4 Rec. ITU-R SA.1159-4 TABLE 2 Performance objectives for links in the EESS and MetSat using geostationary orbits Frequency band Satellite service Modulation Applicable elevation angle (degrees) Minimum C/N or maximum BER Required time availability (
29、%) Function and type of earth station 401-403 MHz (Earth-to-space) MetSat and EESS Digital 3 105 99.6 Data collection, Low-gain antenna 460-470 MHz (space-to-Earth) MetSat and EESS Digital 3 105 99.6 DCP interrogation, low-gain antenna 1 670-1 710 MHz (space-to-Earth) MetSat and EESS Digital 3 106 9
30、9.9 Direct data readout and data dissemination, high-gain antenna Analogue 3 10 dB 99.9 Data dissemination, high-gain antenna Digital 3 106 99.6 CDA station, high-gain antenna 2 025-2 110 MHz (Earth-to-space) EESS Digital 3 105 99.6 CDA station, high-gain antenna 7 450-7 550 MHz (space-to-Earth) Met
31、Sat Digital 5 106 99.9 Direct data readout, high-gain antenna 18.1-18.3 GHz (space-to-Earth) MetSat Digital 5 107 99.9 Direct data readout, high-gain antenna 25.5-27.0 GHz (space-to-Earth) EESS Digital 5 107 99.9 Direct data readout, high-gain antenna Rec. ITU-R SA.1159-4 5 Notes to Table 2: NOTE 1
32、Performance objectives for specific systems may differ from the objectives presented in this Recommendation; however, the objectives defined herein are used as a basis for deriving permissible levels of interference that are the minimum interference thresholds to be accepted by specific systems. NOT
33、E 2 Additional performance objectives could be specified for an availability of 99.99% of the time in relation to the need to synchronize the receiver to the data transmission frames and to avoid bit slips within a frame. However, for the purpose of deriving interference criteria, these objectives c
34、an be assumed to be met if the objectives associated with the above availability levels are met. NOTE 3 The EESS is only allocated in the 1 690-1 710 MHz portion of the band. NOTE 4 In all cases in Table 2, it is assumed that earth station sites are selected to yield average levels of environmental
35、radio-frequency noise within the band. For direct data readout stations, which may be deployed in large numbers by various operating entities, there is a risk that randomly selected sites will exhibit higher than average levels of environmental noise (especially man-made noise) that may hamper the a
36、bility to achieve the stated performance objectives. However, the variance of this noise over all locations is not large in relation to receiver thermal noise, such that the performance objectives can generally be met at over 95% of the possible locations given link power margins of a few decibels.
