RECOMMENDATION ITU-R M.1830

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Rec. ITU-R M.1830 1 RECOMMENDATION ITU-R M.1830 Technical characteristics and protection criteria of aeronautical radionavigation service systems in the 645-862 MHz frequency band (2007) Scope This Recommendation complements the technical characteristics of aeronautical radionavigation systems in the frequency band 645-862 MHz for relations not covered by RRC-06 and can be used by concerned administrations as technical guidelines for bilateral discussion and for estimations of compatibility with other radiocommunication services of administrations not party to the RRC-06 Agreement. The ITU Radiocommunication Assembly, considering a) that the aeronautical radionavigation service operates on a primary basis in the 645-862 MHz frequency band in a number of countries under No. 5.312 of the Radio Regulations (RR); b) that the 645-862 MHz frequency band is also used by other services on a primary basis, recognizing a) that the radionavigation service is a safety service as specified by RR No. 1.59; b) that RR No. 4.10 states that the safety-of-life aspects of the radionavigation and other safety services require special measures to ensure their freedom from harmful interference (see also RR No. 1.169); c) that there is increasing need to ensure compatibility between the radionavigation services and other services which share their allocated bands; d) that the procedures and methodology for analysing compatibility between radars and systems in other services are contained in Recommendation ITU-R M.1461, recommends 1 that the technical characteristics and protection criteria of aeronautical radionavigation systems in the band 645-862 MHz contained in Annexes 1 and 2 should be used in the assessment of compatibility with other services.

2 Rec. ITU-R M.1830 Annex 1 Technical characteristics of aeronautical radionavigation service systems in the 645-862 MHz frequency band In accordance with RR No. 5.312, the 645-862 MHz band is allocated in a number of countries to the aeronautical radionavigation service (ARNS) on the primary basis. Within this service several types of radionavigation systems are used, including: radio systems for short-range navigation (RSBN); secondary radars for the air traffic control (ATC) which includes the ground radar and the onboard transponder; primary airfield and route radars for the ATC. All specified means are used to support navigation and air traffic control functions. The basic characteristics for different types of aeronautical radionavigation stations operating in the band 645-862 MHz are presented in Table 1. 2

Rec. ITU-R M.1830 3 TABLE 1 Aeronautical radionavigation systems characteristics in the band 645-862 MHz Type of station RSBN RLS 2 (Type 1) RLS 2 (Type 2) RLS 1 (Type 1) RLS 1 (Type 2) Characteristics Application Air-Ground Secondary radars Type 1 (air traffic control) Transmitter characteristics Station name Aircraft Aircraft transponder Secondary radars Type 2 Primary radars Type 1 Aircraft transponder Primary radars Type 2 Place of station Aircraft Airfields Aircraft Airfields Aircraft Airfields Airfields Maximum effective radiated pulse power (e.r.p.) (dbw) 30.5 48 35 69.5 34.5 82 82 Pulse power (dbw) 27 31 32 40 31 52.5 52.5 Mean power (dbw) 0.5 1 14 19.5 10.5 19.5 19.5 Off-duty ratio 447 1 000 63.1 112 112 1 995 1 995 Pulse repetition cycle (ms) 2.3 1.3 0.6 1.8 1.8 1.8 1.8 Pulse length (µs) 5.1 1.3 8.7 16 16 0.9-2 0.9-2 Necessary emission bandwidth (MHz) 3/0.7 4 4 3 8 6 3 Class of emission P0X/PXX K0X K0X M1X M1X P0N P0N Operating frequencies (MHz) 772, 776, 780, 784, 788, 792, 796, 800, 804, 808 668 668 835, 836, 837.5 740 833, 835, 836, 858 844, 847, 853, 859 Antenna height (m) 0 to 10 000 10 0 to 10 000 10 0 to 10 000 10 10 Maximum antenna gain (dbi) 3.5 17 3 29.5 3.5 29.5 29.5 Antenna pattern ND vert. pl. = 28 hor. pl. = 4 ND hor. pl. = 3-5 ND hor. pl. = 4 hor. pl. = 4

4 Rec. ITU-R M.1830 TABLE 1 (end) Type of station RSBN RLS 2 (Type 1) RLS 2 (Type 2) RLS 1 (Type 1) RLS 1 (Type 2) Characteristics Direction of the antenna main beam Receiver characteristics Station name Lower hemisphere Azimuth: 0-360 Revolution speed 6 rev/min. receiver Aircraft responder of ground radar Lower hemisphere receiver Azimuth: 0-360 10 rev/min. Aircraft responder of ground radar Lower hemisphere receiver Azimuth: 0-360 6/10 rev/min. receiver Azimuth: 0-360 6/10 rev/min. receiver AA8 BD BA BC AA2 AB AB Place of station Airfields Aircraft Airfields Aircraft Airfields Airfields Airfields Antenna height (m) 10 0-10 000 10 0-10 000 10 10 10 Polarization (1) Linear, horizontal Linear, vertical Linear, vertical Linear, horizontal Linear, horizontal Linear, horizontal Maximum antenna gain (dbi) 22 3 17 3 28.4 29.5 29.5 Antenna pattern Direction of antenna main beam (1) vert. pl. = 50 hor. pl. = 4-5 Azimuth: 0-360 100 rev/min. ND Lower hemisphere vert. pl. = 28 hor. pl. = 4 Azimuth: 0-360 Revolution speed 6 rev/min. ND Lower hemisphere 3 db beamwidth: hor. pl. = 3-5 Azimuth: 0-360 Revolution speed 10 rev/min. hor. pl. = 3-5 Azimuth: 0-360 6/10 rev/min. Linear, horizontal hor. pl. = 3-5 Azimuth: 0-360 6/10 rev/min. In the case when the interferer has orthogonal polarization in relation to the wanted signal, a value of 16 db should be added to protected field-strength values in Tables 2 to 8 due to polarization discrimination. 4

Rec. ITU-R M.1830 5 Annex 2 criteria for aeronautical radionavigation service systems in the 645-862 MHz band from DVB-T interference The protection criteria for different types of aeronautical radionavigation stations operating in the band 645-862 MHz are presented in Tables 2 to 8. For the sharing analyses with terrestrial broadcasting services it is important to provide protection criteria in a form indicating minimum field strength to be protected and protection ratios for different values of frequency difference between centre frequencies of DVB-T and aeronautical radionavigation station signals which takes into account impact of interference in adjacent channels. The values for minimum field-strength values are based on experimental studies. NOTE 1 Further information may be required on the detailed environment and conditions of the measurements. ratios for the case of interference from DVB-T into ARNS receivers which are presented in Table 2 are based on experimental measurements, whereas protection ratios in Tables 3 to 8 are theoretical ones. ratios in Tables 3 to 8 are based on perspective masks for ARNS filters in the band 645-862 MHz that significantly reduce interference susceptibility of ARNS receivers with different required emission band. The masks are presented in Fig. 1. FIGURE 1 Perspective ARNS receiver filter mask in the band 645-862 MHz band The masks are based on theoretically obtainable capabilities in modernization of ARNS receiving filters and actually they refer to practically ideal characteristics of filtration (rectangularity factor of at least 1.3 at 40 db).

6 Rec. ITU-R M.1830 The masks were employed for estimation of protection ratios for ARNS receivers using the DVB-T masks for a non-critical case and sensitive cases. Protected field strength, (db(µv/m)) TABLE 2 RSBN protection criteria Ground reception AA8 Percentage of time (%) (1) 10 ratios PR in f 42 f (2) (MHz) 12.0 10.0 8.0 6.0 4.0 2.0 0.0 +2.0 +4.0 +6.0 +8.0 +10.0 +12.0 PR (3) (db) 65.0 50.0 27.0 16.0 5.0 0.0 0.0 0.0 5.0 16.0 40.0 52.0 65.0 (1) (2) (3) Percentage of time for which interfering signal field strength is exceeded due to variation in propagation conditions (see Recommendation ITU-R P.1546). f: Frequency difference between centre frequencies of DVB-T and aeronautical radionavigation station signals. PR: ratio (in terms of the RRC-04 Report), provided by the ARNS receiver frequency selectivity. (1) (2) TABLE 3 RLS 2 (Type 1) protection criteria Aircraft reception BD Protected field strength, (db(µv/m)) 52 single interferer (1) /59 aggregate interference (2) Percentage of time (%) Free space (0%) ratios See Tables 3-1 and 3-2 Necessary bandwidth (MHz) 4 The protected field-strength values for single interferer are to be used in the planning exercise when assessing interference from digital broadcasting assignment/allotment in a one-to-one interference situation. The values for aggregate interference are provided to indicate protection required from all sources of interference and not applicable to a single DVB-T. Given values are derived from worst-case analysis. TABLE 3-1 RLS 2 (Type 1) protection ratios Aircraft reception (non-critical DVB-T mask)* f 16 15 6.5 6 5.5 5 4 2.5 0 2.5 4 5 5.5 6 6.5 15 16 ratio (db) 81.3 66.4 44.1 34 12 9 5.9 3.5 2.8 3.5 5.9 9 12 34 44.1 66.4 81.3 * For details please refer to the RRC-06 Agreement (Annex 3). 6

Rec. ITU-R M.1830 7 TABLE 3-2 RLS 2 (Type 1) protection ratios Aircraft reception (sensitive case DVB-T mask)* f 16 15 6.5 6 5.5 5 4 2.5 0 2.5 4 5 5.5 6 6.5 15 16 ratio (db) 90.9 66.5 44.9 39 12 9 6 3.5 2.8 3.5 6 9 12 39 44.9 66.5 90.9 * For details please refer to the RRC-06 Agreement (Annex 3). (1) TABLE 4 RLS 2 (Type 1) protection criteria Ground reception Protected field strength (db(µv/m)) BA Percentage of time (%) 10 ratios See Tables 4-1 and 4-2 Necessary bandwidth (MHz) 4 29 single interferer (1) /33 aggregate interference The protected field-strength values for single interferer are to be used in the planning exercise when assessing interference from digital broadcasting assignment/allotment in a one-to-one interference situation. The values for aggregate interference are provided to indicate protection required from all sources of interference and not applicable to a single DVB-T. TABLE 4-1 RLS 2 (Type 1) protection ratios Ground reception (non-critical case DVB-T mask) f 16 15 6.5 6 5.5 5 4 2.5 0 2.5 4 5 5.5 6 6.5 15 16 ratio (db) 81.3 66.4 44.1 34 12 9 5.9 3.5 2.8 3.5 5.9 9 12 34 44.1 66.4 81.3 TABLE 4-2 RLS 2 (Type 1) protection ratios Ground reception (sensitive case DVB-T mask) f 16 15 6.5 6 5.5 5 4 2.5 0 2.5 4 5 55 6 6.5 15 16 ratio (db) 90.9 66.5 44.9 39 12 9 6 3.5 2.8 3.5 6 9 12 39 44.9 66.5 90.9

8 Rec. ITU-R M.1830 TABLE 5 RLS 2 (Type 2) protection criteria Aircraft reception BC Protected field strength (db(µv/m)) 73 single interferer Percentage of time (%) Free space (0 %) ratios See Tables 5-1 and 5-2 Necessary bandwidth (MHz) 3 TABLE 5-1 RLS 2 (Type 2) protection criteria Aircraft reception (non-critical case DVB-T mask) f 16 14 8 6.5 6 5 4 2 0 2 4 5 6 6.5 8 14 16 ratio (db) 82.8 64 49.2 45.8 45.39 12.1 7.25 4 4 4 7.25 12.1 45.39 45.8 49.2 64 82.8 TABLE 5-2 RLS 2 (Type 2) protection ratios Aircraft reception (sensitive case DVB-T mask) f 16 14 8 6.5 6 5 4 2 0 2 4 5 6 6.5 8 14 16 ratio in db 92.4 64.3 49.4 46.28 46.26 12.2 7.27 4 4 4 7.27 12.2 46.26 46.28 49.4 64.3 92.4 (1) TABLE 6 RLS 2 (Type 2) protection criteria Ground reception Protected field strength (db(µv/m)) AA2 Percentage of time (%) 10 ratios See Tables 6-1 and 6-2 Necessary bandwidth (MHz) 8 24 single interferer (1) /28 aggregate interference The protected field-strength values for single interferer are to be used in the planning exercise when assessing interference from digital broadcasting assignment/allotment in a one-to-one interference situation. The values for aggregate interference are provided to indicate protection required from all sources of interference and not applicable to a single DVB-T. TABLE 6-1 RLS 2 (Type 2) protection ratios Ground reception (non-critical case DVB-T mask) f 17 15 10 9 8.5 8 7 4 0 4 7 8 8.5 9 10 15 17 ratio (db) 79.4 61.2 46.3 43.2 43 19.9 8.7 2.9 0 2.9 8.7 19.9 43 43.2 46.3 61.2 79.4 8

Rec. ITU-R M.1830 9 TABLE 6-2 RLS 2 (Type 2) protection ratios Ground reception (sensitive case DVB-T mask) f 17 15 10 9 8.5 8 7 4 0 4 7 8 8.5 9 10 15 17 ratio (db) 89.4 61.3 46.5 43.4 43. 20.2 8.7 2.9 0 2.9 8.7 20.2 43.0 43.4 46.5 61.3 89.4 TABLE 7 RLS 1 (Type 1) protection criteria Ground reception AB Protected field strength (db(µv/m)) 13 single interferer Percentage of time (%) 10 ratios See Tables 7-1 and 7-2 Necessary bandwidth (MHz) 6 TABLE 7-1 RLS 1 (Type 1) protection ratios Ground reception (non-critical case DVB-T mask) f 17 15 9 7.5 6.5 6 4 1 0 1 4 6 6.5 7.5 9 15 17 ratio (db) 80.6 63.79 47.1 44.4 11.7 8.8 4.1 1.1 1 1.1 4.1 8.8 11.7 44.4 47.1 63.79 80.6 TABLE 7-2 RLS 1 (Type 1) protection ratios Ground reception (sensitive case DVB-T mask) f 17 15 9 7.5 6.5 6 4 1 0 1 4 6 6.5 7.5 9 15 17 ratio (db) 90.66 63.9 47.3 45.4 11.8 8.8 4.1 1.1 1 1.1 4.1 8.8 11.8 45.4 47.3 63.9 90.66 TABLE 8 RLS 1 (Type 2) protection criteria Ground reception AB Protected field strength (db(µv/m)) 13 single interferer Percentage of time (%) 10 ratios See Tables 8-1 and 8-2 Necessary bandwidth (MHz) 3

10 Rec. ITU-R M.1830 TABLE 8-1 RLS 1 (Type 2) protection ratios Ground reception (non-critical case DVB-T mask) f 16 14 8 6.5 6 5 4 2 0 2 4 5 6 6.5 8 14 16 ratio (db) 82.8 64 49.2 45.8 45.39 12.1 7.25 4 4 4 7.25 12.1 45.39 45.8 49.2 64 82.8 TABLE 8-2 RLS 1 (Type 2) protection ratios Ground reception (sensitive case DVB-T mask) f 16 14 8 6.5 6 5 4 2 0 2 4 5 6 6.5 8 14 16 ratio (db) 92.4 64.3 49.4 46.28 46.26 12.2 7.27 4 4 4 7.27 12.2 46.26 46.28 49.4 64.3 92.4 10

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