ITU-R RS 1263-1-2010 Interference criteria for meteorological aids operated in the 400 15-406 MHz and 1 668 4-1 700 MHz bands《运行于400 15-406 MHz和1668 4-1700 MHz频段的气象辅助的干扰标准》.pdf

1、 Recommendation ITU-R RS.1263-1(01/2010)Interference criteria for meteorological aids operated in the 400.15-406 MHz and 1 668.4-1 700 MHz bandsRS SeriesRemote sensing systemsRec. ITU-R RS.1263-1 ii Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient an

2、d 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 of the Radiocommunication Sector are perfor

3、med 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 in Annex 1 of Resolution ITU-R 1. Forms to

4、 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 patent information database can also be fou

5、nd. 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 (television) F Fixed service M Mobile, rad

6、iodetermination, 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 fixed service systems SM Spectrum management

7、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, 2010 ITU 2010 All rights reserved. No part of th

8、is publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R RS.1263-1 1RECOMMENDATION ITU-R RS.1263-1 Interference criteria for meteorological aids operated in the 400.15-406 MHz and 1 668.4-1 700 MHz bands (Question ITU-R 144/7) (1997-2010) Scope This Re

9、commendation provides interference criteria data which should be used for compatibility and sharing studies for MetAids operating in the 400.15-406 MHz and 1 668.4-1 700 MHz bands. The ITU Radiocommunication Assembly, considering a) that interference criteria are needed to ensure that systems can be

10、 designed to achieve adequate performance in the presence of interference; b) that the performance objectives for radiosonde, dropsonde, and rocketsonde systems are specified in Recommendation ITU-R RS.1165; c) that interference criteria assist in the development of criteria for sharing bands among

11、systems, including those operating in other services; d) that systems in the meteorological aids (MetAids) service must specify interference thresholds at least equal to the permissible levels, recommends 1 that the interference levels specified in Tables 1 and 2 should be used as the permissible to

12、tal levels of interfering signal power at the antenna output of receiving stations operating in the MetAids service based on the MetAids parameters of representative systems as provided in Annex 1. Rec. ITU-R RS.1263-1 2 TABLE 1 Interference criteria for radiosonde systems in the MetAids service Par

13、ameter Radio direction finding (RDF) radiosonde system 1 668.4-1 700 MHz GPS radiosonde system 1 675-1 683 MHz NAVAID with directional antenna 400.15-406 MHz NAVAID with omnidirectional antenna 400.15-406 MHz System reference bandwidth 1 300 kHz 150 kHz 300 kHz Interference signal power (dBW) in the

14、 reference bandwidth to be exceeded no more than PLOCK-LOSS% of the time 135.3 137.2 141.9 Not applicable(1)Percentage of time, PLOCK-LOSS (%)(2) 0.02 0.025 0.02 Not applicable(1)Interference signal power (dBW) in the reference bandwidth to be exceeded no more than PDATA-LOSS% of the time 139.4 145.

15、7 149.6 154.4 Percentage of time, PDATA-LOSS(%)(2)0.8 0.125 0.2 0.2 Interference signal power (dBW) in the reference bandwidth to be exceeded no more than 20% of the time(2)155.2 152.6 156.1 (1)Systems with omnidirectional antennas are not vulnerable to losing antenna lock on the signal due to inter

16、ference or signal fading. (2)This percentage of time shall not be exceeded on a per-flight basis. Rec. ITU-R RS.1263-1 3TABLE 2 Interference criteria for rocketsonde and dropsonde systems in the MetAids service Parameter Airborne dropsonde systems400.15-406 MHz Rocketsonde systems 400.15-406 MHz Sys

17、tem reference bandwidth 20 kHz 3 MHz Interference signal power (dBW) in the reference bandwidth to be exceeded no more than PLOCK-LOSS% of the time Not applicable(1)116.9 PLOCK-LOSS(%)(2)Not applicable(1)0.02 Interference signal power (dBW) in the reference bandwidth to be exceeded no more than PDAT

18、A-LOSS% of the time 161.6 122.1 PDATA-LOSS(%)(2)0.060 0.060 Interference signal power (dBW) in the reference bandwidth to be exceeded no more than 20% of the time 168.9 135.6 (1)Systems with omnidirectional antennas are not vulnerable to losing antenna lock on the signal due to interference or signa

19、l fading. (2)This percentage of time shall not be exceeded on a per-flight basis. Annex 1 Basis for performance and interference criteria for MetAids in the 400.15-406 MHz and 1 668.4-1 700 MHz bands 1 Introduction The bands 400.15-406 MHz (referred to as the 403 MHz bands throughout) and 1 668.4-1

20、700 MHz (referred to as the 1 680 MHz band throughout) are allocated to MetAids on a primary basis. The bands 400.15-403 MHz and 1 670-1 700 MHz are also allocated to the meteorological satellite (METSAT) users on a co-primary basis; and the band 400.15-401 MHz is allocated to the mobile-satellite s

21、ervice (MSS) worldwide. The band 1 668.4-1 675 MHz is allocated to the mobile-satellite service (MSS) on a worldwide basis. 4 Rec. ITU-R RS.1263-1 The term MetAids is used to describe a variety of types of meteorological equipment; radiosondes, dropsondes and rocketsondes. MetAids are flown worldwid

22、e for the collection of upper atmosphere meteorological data for weather forecasts and severe storm prediction, collection of ozone level data, and measurement of atmospheric parameters for various other applications. The data collected from these flights, or soundings, is of extreme importance for

23、the protection of life and property through the prediction of severe storms and providing vital data for commercial airlines operations. 2 Methodology for calculation of MetAids interference criteria Since MetAids are typically most vulnerable to interference at the maximum slant range of operation,

24、 the interference criteria will be established based on the link margin at the maximum slant range. Although this assumption does not allow other potential users of the bands the flexibility of taking advantage of the higher link margins at shorter slant ranges, this factor may be applied, if approp

25、riate, in detailed sharing studies. This range will be a typical maximum slant range for most of the world, but does not represent the extreme conditions encountered in wintertime at high latitudes. The interference criteria of MetAids will be established at three points for systems with directional

26、 antennas: an interference level and percentage time for loss of receiver tracking lock, an interference level and percentage time for loss of data, and a long -term interference level to be exceeded for no greater than 20% of the time. The loss of receiver lock values are not applicable to MetAids

27、systems with omnidirectional antennas since the antennas cannot be misdirected away from the signal during a period of signal loss or interference. For MetAids systems with omnidirectional antennas, an interference level and percentage of time will be calculated for data loss and for a long-term int

28、erference level to be exceeded for no greater than 20% of the time. Since the different types of MetAids are utilized in different applications and exhibit different characteristics, criteria will be established for each. The first level of short-term interference criteria to be established, applica

29、ble only to systems with directional tracking antennas, will be the level associated with loss of receiver tracking lock, which is allowable for only a brief period of time and is only applicable to systems with directional tracking antennas. This is the maximum time in which the receiver can withst

30、and loss of signal and still recover and lock the tracking antenna back on the signal when it returns. The total time percentage, P%TOTAL, loss of tracking lock that may occur will be calculated according to the system and application. That percentage will then be subdivided into a percentage for in

31、trasystem sources, and a percentage for intersystem sources. In this case, loss of lock will be subdivided so that 25% of P%TOTALis attributed to intersystem interference. The interference criteria for loss of tracking lock will be calculated in the following manner: ILOCK-LOSS= NRX+ 10 log (10M/10

32、1) (1) where: NRX: receiver noise spectral density from link budget (see Tables 4 and 5) M : margin calculated for loss of lock calculated from link budget (see Tables 4 and 5). The level, ILOCK-LOSS, shall not be exceeded more than P%LOCK-LOSS, where: P%LOCK-LOSS= 0.25 (P%TOTAL) Rec. ITU-R RS.1263-

33、1 5The second level of short-term interference criteria, applicable to all systems, is the level at which loss of data will occur. The percentage of time for this occurrence may be obtained from the users data availability objectives. The published data availability requirements of MetAids typically

34、 are for all sources of data loss and data error. MetAids flights experience sensor data errors, in addition to data loss, which are filtered out during data processing. 25% of the total data loss/error percentage P%TOTALwill be attributed to interference and 25% of this may be attributed to intersy

35、stem interference, hence: P%DATA-LOSS= (25%) (25%) (P%TOTAL) = (6.25%) (P%TOTAL) The interference criteria for data loss will be calculated in the following manner: IDATA-LOSS= NRX+ 10 log (10M/10 1) (2) where: NRX: receiver noise spectral density from link budget (see Tables 4 and 5) M : margin cal

36、culated for data loss from link budget (see Tables 4 and 5). The level IDATA-LOSSshall not be exceeded more than P%DATA-LOSS. The third interference level will be the long-term level, to be exceeded no more than 20% of the time. The long-term interference level can be calculated based on both the sh

37、ort-term margins for loss of lock (when applicable) and data loss. The level calculated from the short-term loss of lock margin is insignificant since it is dominated by the level calculated from the data loss margin. For the long term (20%), 2/3 of the margin associated with data loss will be retai

38、ned for MetAids. The interference criteria for data loss will be calculated in the following manner: I20%= NRX+ 10 log (10M/301) or NRX 10 dB, whichever is greater (3) where: NRX: receiver noise spectral density from link budget (see Table 4) M : margin calculated for data loss from link budget (see

39、 Table 4). The level I20%shall not be exceeded more than 20% of time. 6 Rec. ITU-R RS.1263-1 TABLE 3 Percentages of time associated with representative MetAids systems Percentage RDF system 1 668.4-1 700 MHz GPS system1 675-1 683 MHz NAVAID system with directional antenna NAVAID system with omnidire

40、ctional antenna Dropsonde system Rocketsonde system Tracking loss percentage of time (P%TOTAL-LOCK) 0.08% 0.1% 0.08% N/A(1)N/A(1)0.08% Percentage of tracking loss attributed to intersystem interference (P%LL-INTERSYSTEM) 25% 25% 25% N/A(1)N/A(1)25% Maximum link unavailability percentage of time (P%T

41、OTAL)(2)13.5% 2.0% 1% 1% 1.0% 1.0% Percentage of data loss attributed to interference (P%DL-INTERFERENCE) 25% 25% 25% 25% 25% 25% Percentage of data loss attributed to intersystem interference (P%DL-INTERSYSTEM) 25% 25% 25% 25% 25% 25% Resulting percentage of time for tracking loss interference crit

42、eria (P%LOCK-LOSS) 0.02% 0.025% 0.02% N/A(1)N/A(1)0.02% Resulting percentage of time for data loss interference criteria (P%DATA-LOSS) 0.8% 0.125% 0.2% 0.2% 0.06% 0.06% N/A: Not applicable. (1)Systems with omnidirectional antennas are not vulnerable to losing antenna lock on the signal due to interf

43、erence or signal fading. (2)Elements of this table were derived from total flight data availability data taken from Recommendation ITU- RS.1165-2. 3 Link budget analysis for MetAids The various types of MetAids are utilized for different purposes and have different system characteristics, and as a r

44、esult have different link budget calculations. Tables 4 and 5 list the link budget calculations for representative systems used worldwide. Rec. ITU-R RS.1263-1 7TABLE 4 Link budget calculations for MetAids operated in the band 400.15-406 MHz Performance factor NAVAID directional antenna NAVAID omnid

45、irectional antenna Dropsondes Rocketsonde Modulation type FM AM Frequency range (MHz) 400.15-406 Per cent time performance is not exceeded (%) 0.02 track loss 0.2 data loss 0.2 data loss 0.06 data loss 0.02 track loss 0.06 data loss 1 Transmitter output power (dBW) 6.0 6.2 8.5 5.2 2 Antenna gain ave

46、rage (dBi) 2.0 4 2.0 0.0 3 Transmitter e.i.r.p. (dBW) 4.0 10.2 6.5 5.2 4 Maximum link length (km) 250 150 350 70 5 Free-space path loss (dB) 132.5 128.0 135.4 121.4 6 Excess path loss (rain, fading, etc.) (dB) 1.5 1.0 4.0 0.25 7 Ground station antenna gain (dBi) 8.0 2.0 0.0 20 8 Ground station anten

47、na pointing error (dB) 0.0 0.5 9 Receiver system loss (antenna feed, cables, etc.) (dB) 2.0 0.0 2.0 10 Polarization mismatch loss (dB) 0.5 0.0 0.5 11 Received signal power (dBW) 132.5 133.5 145.9 109.85 12 Receiver reference bandwidth (kHz) 300 20 3 000 13 Reference bandwidth (dBHz) 54.8 42.5 64.8 1

48、4 Received energy per Hz, C0dB(W/Hz) 187.3 188.3 188.4 174.65 15 Receiver system noise temperature (K) 600 410 738 16 Receiver system noise power (dBW) 146 160 165 17 Receiver noise spectral density, N0dB(W/Hz) 200.9 202.5 200.518 Minimum C0/N0 (dB) 7 12 12 12 7 12 19 Actual C0/N0 for flight (dB) 13

49、.6 12.6 14.1 25.8 20 Margin (dB) 5.6 1.6 0.6 2.1 18.9 13.8 8 Rec. ITU-R RS.1263-1 TABLE 5 Link budget calculations for MetAids operated in the band 1 668.4-1 700 MHz RDF system GPS system Modulation type AM FM Frequency range (MHz) 1 668.4-1 700 1 675-1 683 Per cent time performance is not exceeded (%) 0.02 track loss 0.8 data loss 0.025 track loss 0.125 data loss 1 Transmitter output power (dBW) 6.0 5.0 2 Antenna gain average (dBi) 2.0 2 3 Radiosonde e.i.r.p. (dBW) 4.0 3.0 4 Maximum link length (km) 250 5 Free-space path loss (dB) 144.9 6 E