Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3840

c) the DPSK transmissions must have a detection probability at the extremes of coverage of at least 72 per cent. 2.6.1.2 The source of CMN at 37 km (20 NM) is primarily internal receiver thermal noise. The noise induced error (dș) can be estimated by: BW d SNR g T T Function sample rate g = 2 (Filter noise bandwidth right) where șBW is the antenna beamwidth in degrees and g is the ratio of the function sample rate to the noise bandwidth of the receiver output filter. For a single pole filter, the noise bandwidth is ʌ/2 times the 3 dB bandwidth. This expression reflects the CMN dependence upon ground antenna beamwidth and sample rate. 2.6.2 System power budget 2.6.2.1 The system power budget is presented in Table G-1. The power density specified in Chapter 3, 3.11.4.10.1, is related to the signal power specified in Table G-1 at the aircraft antenna by the relation: 23/11/06 ATT G-6 2007/70/II. szám Attac ment G Annex 10 — Aeronautical Communications Power into isotropic antenna (dBm) = Power density (dBW/m2) – 5.5 2.6.2.2 The angle function measurement assumes a 26-kHz beam envelope filter bandwidth. The video (SNR) given in 2.6.1 is related to the intermediate frequency (IF) SNR by: SNR (Video) = SNR (IF) + IF noise bandwidth 10log Video noise bandwidth ª º  « » ¬ ¼ 2.6.2.3 The DPSK preamble function analysis assumes: 1) a carrier reconstruction phase lock loop airborne receiver implementation; and 2) that the receiver preamble decoder rejects all preambles which do not satisfy the Barker code or fail the preamble parity check. 2.6.2.4 Items a) through e) in Table G-1 are functions of the aircraft position or weather, and thus have been assumed to be random events. That is, they will simultaneously reach their worst-case values only on rare occasions. Therefore, these losses are viewed as random variables and are root-sum-squared to obtain the loss component. 2.6.2.5 To support autoland operations, power densities higher than those specified for the approach azimuth angle signals in Chapter 3, 3.11.4.10.1 are required at the lower coverage limit above the runway surface to limit the CMN to 0.04 degree. Normally, this additional power density will exist as a natural consequence of using the same transmitter to provide the scanning beam and DPSK signals and considering other power margins such as the available aircraft antenna gain, propagation losses, coverage losses at wide angles and rain losses which can be, at least partially, discounted in the runway region (see Table G-1). 2.6.3 Airborne power budget 2.6.3.1 Table G-2 provides an example of an airborne power budget used in developing the power density standards. 2.7 Data applications 2.7.1 Basic data. The basic data defined in Chapter 3, 3.11.4.8.2.1 are provided to enable airborne receivers to process scanning beam information for various ground equipment configurations and to adjust outputs so they are meaningful to the pilot or airborne system. Data functions are also used to provide additional information (e.g. station identification and equipment status) to the pilot or airborne system. 2.7.2 Auxiliary data 2.7.2.1 The auxiliary data defined in Chapter 3, 3.11.4.8.3.1 and 3.11.4.8.3.2 are provided to digitally uplink the following types of information:

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