1、 Recommendation ITU-R M.1831-1 (09/2015) A coordination methodology for radionavigation-satellite service inter-system interference estimation M Series Mobile, radiodetermination, amateur and related satellite services ii Rec. ITU-R M.1831-1 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, 2015
8、ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R M.1831-1 1 RECOMMENDATION ITU-R M.1831-1 A coordination methodology for radionavigation-satellite service inter-system interference estimation (Question
9、 ITU-R 217-2/4) (2007-2015) Scope This Recommendation gives a methodology for radionavigation-satellite service (RNSS) intersystem interference estimation to be used in coordination between systems and networks in the RNSS. As Resolution 610 (WRC-03) applies to all systems and networks in the RNSS a
10、nd contains measures that are designed to facilitate RNSS inter-system compatibility determination, this Recommendation is applicable to the RNSS in the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz. Keywords RNSS, coordination methodology, intersystem interference esti
11、mation Abbreviations/Glossary ADC Analogue-to-Digital Converter AGC Automatic Gain Control PRN Pseudo-Random Noise SSC Spectral Separation Coefficient Related ITU Recommendations, Reports Recommendation ITU-R M.1318-1 Evaluation model for continuous interference from radio sources other than in the
12、radionavigation-satellite service to the radionavigation-satellite service systems and networks operating in the 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz bands Recommendation ITU-R M.1787-2 Description of systems and networks in the radionavigation-satellite service (spa
13、ce-to-Earth and space-to-space) and technical characteristics of transmitting space stations operating in the bands 1 164-1 215 MHz,1 215-1 300 MHz and 1 559-1 610 MHz Recommendation ITU-R M.1901-1 Guidance on ITU-R Recommendations related to systems and networks in the radionavigation-satellite ser
14、vice operating in the frequency bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5 010-5 030 MHz Recommendation ITU-R M.1902-0 Characteristics and protection criteria for receiving earth stations in the radionavigation-satellite service (space-to-Earth) operating in the b
15、and 1 215-1 300 MHz Recommendation ITU-R M.1903-0 Characteristics and protection criteria for receiving earth stations in the radionavigation-satellite service (space-to-Earth) and receivers in the aeronautical radionavigation service operating in the band 1 559-1 610 MHz 2 Rec. ITU-R M.1831-1 Recom
16、mendation ITU-R M.1904-0 Characteristics, performance requirements and protection criteria for receiving stations of the radionavigation-satellite service (space-to-space) operating in the frequency bands 1 164-1 215 MHz, 1 215-1 300 MHz and 1 559-1 610 MHz Recommendation ITU-R M.1905-0 Characterist
17、ics and protection criteria for receiving earth stations in the radionavigation-satellite service (space-to-Earth) operating in the band 1 164-1 215 MHz Recommendation ITU-R M.1906-1 Characteristics and protection criteria of receiving space stations and characteristics of transmitting earth station
18、s in the radionavigation-satellite service (Earth-to-space) operating in the band 5 000-5 010 MHz Recommendation ITU-R M.2030-0 Evaluation method for pulsed interference from relevant radio sources other than in the radionavigation-satellite service to the radionavigation-satellite service systems a
19、nd networks operating in the 1 164-1 215 MHz, 1 215-1 300 MHz and 1 559-1 610 MHz frequency bands Recommendation ITU-R M.2031-1 Characteristics and protection criteria of receiving earth stations and characteristics of transmitting space stations of the radionavigation-satellite service (space-to-Ea
20、rth) operating in the band 5 010-5 030 MHz The ITU Radiocommunication Assembly, considering a) that systems and networks in the radionavigation-satellite service (RNSS) provide worldwide accurate information for many positioning and timing applications including critical ones related to safety of li
21、fe; b) that WRC-03 adopted new and expanded allocations for the RNSS; c) that any properly equipped earth station may receive navigation information from systems and networks in the RNSS on a worldwide basis; d) that there are several operating and planned systems and networks in the RNSS and an inc
22、reasing number of RNSS filings at the Radiocommunication Bureau proposing to use the RNSS allocations; e) that methods have been developed for use in coordination discussions which provide a common basis for the estimation of interference between such systems and networks in the RNSS, recognizing a)
23、 that the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz are allocated on a primary basis to RNSS (space-to-Earth, space-to-space); b) that the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz are also allocated on a primary basis to other serv
24、ices; c) that Recommendation ITU-R M.1901 provides guidance on this and other ITU-R Recommendations related to systems and networks in the RNSS operating in the frequency bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5 010-5 030 MHz; Rec. ITU-R M.1831-1 3 d) that techn
25、ical and operational characteristics of, and protection criteria for, system and network receivers in the RNSS (space-to-Earth and space-to-space) in the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5 010-5 030 MHz are provided in Recommendations ITU-R M.1905, ITU-R M
26、.1902, ITU-R M.1903, ITU-R M.1904, ITU-R M.1906 and ITU-R M.2031; e) that technical and operational characteristics of system and network transmitters in the RNSS (Earth-to-space, space-to-Earth and space-to-space) in the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5
27、 010-5 030 MHz are provided in Recommendations ITU-R M.1787, ITU-R M.1906 and ITU-R M.2031; f) that Recommendation ITU-R M.1318 provides a model for evaluating interference from environmental sources into RNSS systems in the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz
28、; g) that Recommendation ITU-R M.2030 provides an evaluation method for pulsed interference from relevant radio sources other than in the RNSS to the RNSS systems and networks operating in the 1 164-1 215 MHz, 1 215-1 300 MHz and 1 559-1 610 MHz bands; h) that No. 4.10 of the Radio Regulations (RR)
29、states that the safety aspects of RNSS “require special measures to ensure their freedom from harmful interference”; i) that under RR No. 5.328B systems and networks in the RNSS intending to use the bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz for which complete coordi
30、nation or notification information, as appropriate, is received by the Radiocommunication Bureau after 1 January 2005 are subject to the application of the provisions of RR Nos. 9.12, 9.12A and 9.13, and studies to determine additional methodologies and criteria to facilitate such coordination are b
31、eing planned; j) that under RR No. 9.7, stations in RNSS networks using the geostationary-satellite orbit are subject to coordination with other such stations, and studies to determine additional methodologies and criteria to facilitate such coordination are being planned, further recognizing that R
32、esolution 610 (WRC-03) applies to all systems and networks in the RNSS in the bands mentioned in recognizing a), and contains measures that are designed to facilitate the making of RNSS inter-system compatibility determinations, recommends 1 that the methodology in Annex 1 should be used in carrying
33、 out coordination between RNSS systems operating or proposed to operate in one or more of the same frequency bands identified in recognizing a) (see Note 1); 2 that the guidance in Annexes 2 and 3 should be taken into account by RNSS system operators before and during RNSS coordination. NOTE 1 The m
34、ethodology in Annex 1 may be difficult to apply to multi-satellite FDMA RNSS systems. In this case, Annex 2 may be implemented. 4 Rec. ITU-R M.1831-1 Annex 1 A method for estimating inter-system interference between systems and networks in the RNSS TABLE OF CONTENTS Page 1 Introduction 5 2 Interfere
35、nce analysis methodology . 5 3 Data used in the calculations 8 3.1 Constellation and satellite transmitter models 8 3.2 User receiver model 9 3.3 Interference and noise model 9 4 A simulation-based approach for calculating Gagg . 10 5 A hypothetical example of the methodologys application 14 5.1 An
36、assessment of interference levels 14 5.2 An assessment of effective carrier-to-noise ratios and related degradation . 16 6 RNSS short-code spectrum characteristics and modelling . 19 6.1 RNSS short-PRN code spectrum example . 19 6.2 General aspects of detailed dynamic modelling for RNSS short PRN co
37、des . 20 7 Conclusion 21 Rec. ITU-R M.1831-1 5 1 Introduction This methodology is intended to provide a technique of estimating the interference between systems and networks in the RNSS. As such, it is useful for inter-system RNSS coordination. (For the purpose of brevity, the word “system” will be
38、used instead of “system or network” in the remainder of this document.) The methodology applies to RNSS systems that use CDMA and FDMA to allow sharing of RNSS bands, and recognizes that a simple summation of transmission power density is inadequate to determine what effect an RNSS system will have
39、on others. Unlike RNSS CDMA systems, which typically have only one carrier per occupied band, FDMA systems have several carriers in a single occupied band. It may not be practical to apply the methodology below to each carrier frequency used in a multi-satellite FDMA system. 2 Interference analysis
40、methodology Typically, the post-correlator effective carrier-to-noise density ratio, 0/NC , is used to measure the impact of the interference from various sources on the operational performance of the intended receivers. 0/NC is dependent on the receiver, antenna and external noise from non-RNSS sou
41、rces. However, it is used in assessing inter-system interference of RNSS systems. For the case of continuous interference1, 0/NC is given by: extin tr e f IIINCNC 00(1) where: C: post-correlator received desired-signal power (W) from the satellite in the reference constellation including any relevan
42、t processing losses2 N0: receiver pre-correlator thermal noise power spectral density (W/Hz) N0: post-correlator effective receiver thermal noise power spectral density (W/Hz) Iref: post-correlator effective white-noise power spectral-density (W/Hz) due to the aggregate interference from all the sig
43、nals, except the desired signal, transmitted by all the in-view satellites in the reference constellation including any relevant processing losses Iint: post-correlator effective white-noise power spectral-density (W/Hz) due to the aggregate interference from all the signals transmitted in the frequ
44、ency band of interest by all the in-view RNSS satellites other than those in the reference constellation, including any relevant processing losses Iext: post-correlator effective white-noise power spectral-density (W/Hz) due to the aggregate interference from all radio signals other than those of th
45、e RNSS, including any relevant processing losses : dimensionless effective thermal noise factor given by: 1 When significant pulsed interference is present, equation (1) must be modified. Pulsed interference reduces signal-to-noise ratio by suppressing the desired signal and increasing the effective
46、 noise floor. 2 Relevant processing losses include transmitter and receiver antenna gains; receiver implementation loss, such as filtering and quantization losses; and mismatch losses between the received signal and the reference code. 6 Rec. ITU-R M.1831-1 ffSfH d)()( 2 )(fH : normalized equivalent
47、 transfer function, at frequency f (Hz) given by: HfHfH m axH(f): equivalent receiver filter transfer function (dimensionless), at frequency f (Hz), representing all of the pre-correlator receiver front-end filtering S(f): ideal equivalent two-sided power spectral density (W/Hz), at frequency f (Hz)
48、 of the unfiltered pre-correlator desired signal, normalized to unit power over an infinite bandwidth, and is computed assuming random spreading codes : dummy variable. The receivers effective post-correlator thermal noise level, in the absence of external noise, reduces to 00 vNN . In addition, if
49、H represents an ideal bandpass filter with bandwidth BR (rather than the detailed magnitude transfer function of the receivers front-end filter), then simplifies to: 1d)(d)(2/2/ffSffSRRBBIt should be noted that Iint (W/Hz) can be further broken down to consider the interference due to a specific RNSS system: Iint Ialt Irem where: Ialt: post-correlator effective noise power spectral-density (W/Hz) due to the aggregate interference from all the signals transmitted in the frequency band of interest by all the in-view satell
