Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3723

e) For second ad acent frequency, same or different code assignments The second adjacent frequency combinations generally need not be frequency protected. However, special attention should be given to Note 4 of Table C-4, especially if the undesired facility is a DME/P transponder. 7.1.9 Special considerations for ME and channel assignments Assignment of a Y or Z channel whose reply frequency is 63 MHz removed from the reply frequency of another channel (either a W, X, Y or Z channel) or vice versa requires a distance separation of at least 28 km (15 NM) between facilities. 7.1.10 Special considerations for ME or channel assignments Assignment of a W or Z channel whose reply frequency is 63 MHz removed from the reply frequency of a Y channel or vice versa requires a distance separation of at least equal to the service volume range of the Y channel facility plus 28 km (15 NM). 7.1.11 Special considerations for making pulse spectrum measurements The effective radiated power contained in the 0.5 MHz measurement frequency band specified in 3.5.4.1.3 e) can be calculated by integrating the power spectral density in the frequency domain or equivalently by integrating the instantaneous power per unit time in the time domain using the appropriate analogue or digital signal processing techniques. If the integration is performed in the frequency domain then the resolution bandwidth of the spectrum analyser must be commensurate with the 5 per cent duration interval of the DME pulse. If the integration is performed in the time domain at the output of a 0.5 MHz five pole (or more) filter then the time sample rate must be commensurate with the pulse spectrum width. 7.1.12 Special considerations for ME/P associated with ILS 7.1.12.1 For those runways where it is intended to install DME associated with ILS and where early MLS/RNAV operations are planned, installation of DME/P is preferred. 7.1.12.2 When it is intended to use the DME/P ranging information throughout the terminal area, interrogation pulse pairs with the correct spacing and nominal frequency must trigger the transponder if the peak power density at the transponder antenna is at least minus 93 dBW/m2. This sensitivity level is based on the values contained in Chapter 3, 3.5.4.2.3.1 and it is applied to DME/P IA mode, where at this level DME/P IA mode is intended to comply with DME/N reply efficiency and at least DME/N accuracy. 23/11/06 ATT C-72 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications ATT C-73 23/11/06 7.2 Guidance material concerning DME/N only 7.2.1 Effective radiated power (ERP) of ME/N facilities 7.2.1.1 The power density figure prescribed in 3.5.4.1.5.1 of Chapter 3 is on the following assumptions: Airborne receiver sensitivity –112 dBW Airborne transmission line loss +3 dB Airborne polar pattern loss relative to an isotopic antenna +4 dB Necessary power at antenna –105 dBW Minus 105 dBW at the antenna corresponds to minus 83 dBW/m2 at the mid-band frequency. Note.— The power density for the case of an isotropic antenna may be computed in the following manner 10 log 4 d a P P O  S where Pd = power density in dB /m2 Pa = power at receiving point in dB  Ȝ = wavelength in metres. 7.2.1.2 Nominal values of the necessary ERP to achieve a power density of minus 83 dBW/m2 are given in Figure C-20. For coverage under difficult terrain and siting conditions it may be necessary to make appropriate increases in the ERP. Conversely, under favourable siting conditions, the stated power density may be achieved with a lower ERP. 7.2.1.3 The use of Figure C-20 is illustrated by the following examples. In order to achieve the necessary nominal power density at slant range/levels of 342 km (185 NM)/12 000 m (40 000 ft), 263 km (142 NM)/12 000 m (40 000 ft) and 135 km (73 NM)/6 000 m (20 000 ft), ERPs of the order of plus 42 dBW, plus 36 dBW and plus 30 dBW respectively would be required. 7.3 Guidance material concerning DME/P only 7.3.1 ME/P system description 7.3.1.1 The DME/P is an integral element of the microwave landing system described in Chapter 3, 3.11. The DME/P signal format defines two operating modes, initial approach (IA) and final approach (FA). The IA mode is compatible and interoperable with DME/N and is designed to provide improved accuracies for the initial stages of approach and landing. The FA mode provides substantially improved accuracy in the final approach area. Both modes are combined into a single DME/P ground facility and the system characteristics are such that DME/N and DME/P functions can be combined in a single interrogator. The IA and FA modes are identified by pulse codes which are specified in Chapter 3, 3.5.4.4. In the MLS approach sector, the DME/P coverage is at least 41 km (22 NM) from the ground transponder. It is intended that the interrogator does not operate in the FA mode at ranges greater than 13 km (7 NM) from the transponder site, although the transition from the IA mode may begin at 15 km (8 NM) from the transponder. These figures were selected on the assumption that the transponder is installed beyond the stop end of the runway at a distance of approximately 3 600 m (2 NM) from the threshold. 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 1 0 3 1 m 3 000 10 000 0 000 9 000 30 000 1 000 0 000 1 000 0 000 etres feet ominal effecti e radiated o er re uired to ro ide 3 d m o er density at arious slant ranges le els it a ty ical antenna located 10 m 3 ft a o e ground e el a o e facility lant range distance from antenna 30 d d d Note.— These curves are based on extensive experience of a number of facilities and indicate the nominal effective radiated power to assure the specified power density on a high percentage of occasions taking into account propagation and typical ground/aircraft installation characteristics. Figure C-20 23/11/06 ATT C-74 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications 7.3.1.2 A major potential cause of accuracy degradation encountered in the final phases of the approach and landing operation is multipath (signal reflection) interference. DME/P FA mode minimizes these effects by using wideband signal processing of pulses having fast rise time leading edges, and by measuring the time of arrival at a low point on the received pulse where it has not been significantly corrupted by multipath. This is in contrast to the slower rise time pulses and higher thresholding at the 50 per cent level used in DME/N. 7.3.1.3 Because the FA mode is used at ranges less than 13 km (7 NM), the transmitter can provide an adequate signal level to meet the required accuracy without the fast rise time pulse violating the transponder pulse spectrum requirements. Use of the 50 per cent threshold and a narrow receiver bandwidth in the IA mode permits an adequate but less demanding performance to the coverage limits. The transponder determines the interrogation mode in use by the interrogation code in order to time the reply delay from the proper measurement reference. The IA mode is interoperable with DME/N permitting a DME/N interrogator to be used with a DME/P transponder to obtain at least the accuracy with a DME/N transponder. Similarly, a DME/P interrogator may be used with a DME/N transponder. 7.3.2 ME/P system accuracy requirements 7.3.2.1 ME/P accuracy requirements 7.3.2.1.1 When considering the DME/P accuracy requirement, the operations that can be performed in the service volume of the final approach mode tend to fall into one of two groups. This has led to two accuracy standards being defined for the final approach mode:

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