ITU-R P 842-5-2013 Computation of reliability and compatibility of HF radio systems《高频无线电系统可靠性和兼容性的计算》.pdf
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1、 Recommendation ITU-R P.842-5(09/2013)Computation of reliability and compatibility of HF radio systemsP SeriesRadiowave propagationii Rec. ITU-R P.842-5 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectr
2、um 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 Radiocommunication C
3、onferences 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 statemen
4、ts 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 (Also avai
5、lable 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 satellite
6、 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 signals a
7、nd 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, 2013 ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means
8、 whatsoever, without written permission of ITU. Rec. ITU-R P.842-5 1 RECOMMENDATION ITU-R P.842-5*Computation of reliability and compatibility of HF radio systems (1992-1994-1999-2005-2007-2013) Scope This Recommendation provides methods for the prediction of the reliability and compatibility of HF
9、radio systems. The ITU Radiocommunication Assembly, considering a) that the reliability of a radio system is defined as the probability that a required performance is achieved; b) that reliability is a figure of merit of performance; c) that compatibility is a measure of the degradation caused by in
10、terference to the performance of a radio system; d) that predicted reliabilities and compatibilities are valuable in the selection of preferred combinations of antennas (including, where necessary, their design optimization), frequencies and necessary transmitter power to achieve a desired performan
11、ce, recommends that the following methods for calculating the various types of reliability and compatibility should be used in the planning and design of radio systems. 1 Introduction The reliabilities discussed in this Recommendation form a hierarchy as illustrated in Fig. 1. Basic reliabilities ar
12、e discussed in 2 to 5, overall reliability in 6, reliability in HF networks in 7 and compatibility in 8. The computation of basic circuit reliability (BCR) for digital modulation systems is described in Recommendation ITU-R P.533-12. Specific definitions of different types of reliability are given i
13、n Appendix 1. 2 Inputs to the basic reliability computation For the computation of BCR the method involves the following parameters: monthly median available receiver signal power (Recommendation ITU-R P.533); monthly median atmospheric, man-made and galactic noise powers (Recommendation ITU-R P.372
14、); upper and lower decile deviations from the monthly median signal and noise powers long term (day-to-day) and short term (within-the-hour); required signal-to-noise ratio (Recommendation ITU-R F.339). *Radiocommunication Study Group 3 made editorial amendments to this Recommendation in 2000 in acc
15、ordance with Resolution ITU-R 44. 2 Rec. ITU-R P.842-5 3 Computation of basic circuit reliability (BCR) BCR may be estimated according to the procedure outlined in Table 1 using the information in Table 2. This procedure involves the intermediate calculation of the composite median available receive
16、r power of the wanted signal (Step 1), the median signal-to-noise ratio (Steps 2 and 3), the resultant upper decile of the signal-to-noise ratio (Steps 4 to 6), and the resultant lower decile of the signal-to-noise ratio (Steps 7 to 9). FIGURE 1 Chart of reliabilities P.0842-01ModereliabilityCircuit
17、reliabilityReceptionreliabilityPathreliabilityCommuni-cationsreliabilityServicereliabilitySingle mode All modes All frequencies Circuits in series Paths in parallel Many locationsSingle frequencySingle circuitSingle pathSingle reception locationThe required signal-to-noise ratio (Step 10) is user de
18、fined (Recommendation ITU-R F.339 tabulates signal-to-noise ratios required to provide specific performances). The BCR is then estimated using the statistical distribution given in Step 11. 4 Basic reception reliability (BRR) For n frequencies %100)(111001=niifBCRBRR where BCR(fi) is the percentage
19、BCR for frequency fi.For a single operational frequency, BRR is equal to BCR. Rec. ITU-R P.842-5 3 TABLE 1 Computation of BCR Step Parameter Description of parameter Source of parameter value 1 S Median available receiver power of wanted signal (dBW) Prediction method Pr in 6 of Rec. ITU-R P.533 2 F
20、a A Fa M Fa G Median noise factor for atmospheric noise Median noise factor for man-made noise Median noise factor for galactic noise Rec. ITU-R P.372 3 S/N Median resultant signal-to-noise ratio (dB) for bandwidth b (Hz) S 10 log1010 10 1010 10 10FaAFaMFaG+ 10 log10b + 204 4 Du Sd Du ShSignal upper
21、 decile deviation (day-to-day) (dB) Signal upper decile deviation (within-the-hour) (dB) Table 2 using basic MUF for the path 5 5 Dl A Dl M Dl G Lower decile deviation (dB) of: atmospheric noise man-made noise galactic noise Rec. ITU-R P.372 Rec. ITU-R P.372 2 6 Du SN Upper decile deviation of resul
22、tant signal-to-noise ratio (dB) Root sum square of Du Sd , Du Shand 10 log1010 10 1010 10 1010 10 1010 10 10FaAFaMFaGFaADlAFaMDlMFaGDlG+4 Rec. ITU-R P.842-5 TABLE 1 (end) Step Parameter Description of parameter Source of parameter value 7 Dl Sd Dl ShSignal lower decile deviation (day-to-day) (dB) Si
23、gnal lower decile deviation (within-the-hour) (dB) Table 2 using basic MUF for the path 8 8 Du A Du M Du G Upper decile deviation (dB) of: atmospheric noise man-made noise galactic noise Rec. ITU-R P.372 Rec. ITU-R P.372 2 9 Dl SN Lower decile deviation of resultant signal-to-noise ratio (dB) Root s
24、um square of Dl Sd , Dl Sh and 10 log1010 10 1010 10 1010 10 1010 10 10FaADuAFaMDuMFaGDuGFaAFaMFaG+10 S/NrRequired signal-to-noise ratio (dB) User defined 11 BCR Basic circuit reliability for S/N S/Nr(%) 130 80 / (1 + (S/N S/Nr) / DlSN) or 100, whichever is smaller Basic circuit reliability for S/N
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