Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3642

c) 1, 2, 3 or 4: this number indicates the level of integrity and continuity of service given in Table C-2. Note.— In relation to specific ILS operations it is intended that the level of integrity and continuity of service would typically be associated as follows 1) Level 2 is the performance ob ective for ILS equipment used to support low visibility operations when ILS guidance for position information in the landing phase is supplemented by visual cues. This level is a recommended ob ective for equipment supporting Category I operations 2) Level 3 is the performance ob ective for ILS equipment used to support operations which place a high degree of reliance on ILS guidance for positioning through touchdown. This level is a required ob ective for equipment supporting Category II and IIIA operations and ATT C-39 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I Table C-2. Integrity and continuity of service ob ectives Localizer or glide path Level Integrity Continuity of service MTBO (hours) Not demonstrated, or less than required for Level 2 1 – 10–7 in any one landing 1 – 4 × 10–6 in any period of 15 seconds 1 000 1 – 0.5 × 10–9 in any one landing 1 – 2 × 10–6 in any period of 15 seconds 2 000 1 – 0.5 × 10–9 in any one landing 1 – 2 × 10–6 in any period of 30 seconds (localizer) 15 seconds (glide path) 4 000 (localizer) 2 000 (glide path) Note.— For currently installed systems, in the event that the Level 2 integrity value is not available or cannot be readily calculated, it is necessary to at least perform a detailed analysis of the integrity to assure proper monitor fail-safe operation. 3) Level 4 is the performance ob ective for ILS equipment used to support operations which place a high degree of reliance on ILS guidance throughout touchdown and rollout. This level basically relates to the needs of the full range of Category III operations. 2.14.3 As an example, a Facility Performance Category II — ILS which meets the localizer course structure criteria appropriate to a Facility Performance Category III — ILS down to ILS point “D” and conforms to the integrity and continuity of service objectives of Level 3 would be described as class II/D/3. 2.14.4 ILS classes are appropriate only to the ground ILS element. Consideration of operational categories must also include additional factors such as operator capability, critical and sensitive area protection, procedural criteria and ancillary aids, such as transmissometers and lights. 2.15 ILS carrier frequency and phase modulation 2.15.1 In addition to the desired 90 Hz and 150 Hz AM modulation of the ILS RF carriers, undesired frequency modulation (FM) and/or phase modulation (PM) may exist. This undesired modulation can cause centring errors in ILS receivers due to slope detection by ripple in the intermediate frequency (IF) filter pass-band. 2.15.2 For this to occur, the translated RF carrier frequency must fall on an IF frequency where the pass-band has a high slope. The slope converts the undesired 90 Hz and 150 Hz frequency changes to AM of the same frequencies. Similarly, any difference in FM deviation between the undesired 90 Hz and 150 Hz components is converted to DDM, which in turn produces an offset in the receiver. The mechanism is identical for PM as for FM, since PM causes a change in frequency equal to the change in phase (radians) multiplied by the modulating frequency. 2.15.3 The effect of the undesired FM and/or PM is summed by vector addition to the desired AM. The detected FM is either in phase or anti-phase with the AM according to whether the pass-band slope at the carrier’s IF is positive or negative. The detected PM is in quadrature with the AM, and may also be positive or negative according to the pass-band slope. 23/11/06 ATT C-40 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications 2.15.4 Undesired FM and/or PM from frequencies other than 90 Hz and 150 Hz, but which pass through the 90 Hz and 150 Hz tone filters of the receiver, can also cause changes to the desired 90 Hz and 150 Hz AM modulation of the ILS RF carrier, resulting in a DDM offset error in the receiver. Thus, it is essential that when measuring undesired FM and PM levels, audio band-pass filters with a pass-band at least as wide as that of the tone filters of ILS receivers be used. These filters are typically inserted in commercial modulation meter test equipment between the demodulation and metering circuits, to ensure that only spectral components of interest to ILS applications are measured. To standardize such measurements, the filter characteristics are recommended as shown below: Frequency ( z) 90 z band-pass filter attenuation, dB 150 z band-pass filter attenuation, dB d45 –10 –16 –0.5 (no specification) –14 –0.5 (no specification) (no specification) –0.5 –14 (no specification) –0.5 300 –16 –10 2.15.5 The preferred maximum limits, as shown below, are derived from ILS receiver centring error limits specified in EUROCAE documents ED-46B and ED-47B, based on the worst-case-to-date observed correlation between undesired modulation levels and centring errors: Facility type 90 z peak deviation, FM z/PM radians (Note 1) 150 z peak deviation, FM z/PM radians (Note 2) eviation difference, z (Note 3) Localizer, Cat I 135/1.5 135/0.9 Localizer, Cat II 60/0.66 60/0.4 Localizer, Cat III 45/0.5 45/0.3 Glide path, Cat I 150/1.66 150/1.0 Glide path, Cat II or III 90/1.0 90/0.6 Note 1.— This column applies to the peak frequency or phase deviation as measured with the 90 z tone filter specified in 2.15.4. Note 2.— This column applies to the peak frequency or phase deviation as measured with the 150 z tone filter specified in 2.15.4. Note 3.— This column applies to the difference in peak frequency deviation between the separate measurements of the undesired 90 z FM (or equivalent PM) and the 150 z FM (or equivalent PM) obtained with the filters specified in the table in 2.15.4. The equivalent deviation for 90 z and 150 z measured PM values is calculated by multiplying each peak PM measurement in radians by its corresponding modulating frequency in z. ATT C-41 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I

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