Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3889

d) the detected beamwidth is from 25 to 250 microseconds. Note 2.— Guidance signal validation also requires that the receiver repeatedly confirm that the signal being acquired or tracked is the largest and most persistent signal within the coverage. 7.3.3 ata functions 7.3.3.1 ata acquisition. Performance in the airborne acquisition of data provided on either the basic or auxiliary data function is broken into two items: the time allowed to acquire the data and the probability of an undetected error in the acquired data. 7.3.3.1.1 At the minimum signal power density, the time to acquire basic data word 2 which is transmitted at a rate of 6.25 Hz does not exceed two seconds on a 95 per cent probability basis. The time to acquire data that are transmitted at a rate of 1 Hz does not exceed 6 seconds on a 95 per cent probability basis. 7.3.3.1.2 In the acquisition process, the receiver decodes the appropriate data words and applies certain tests to ensure that the probability of undetected errors does not exceed 1 × 10–6 at the minimum signal power density for those data requiring this level of integrity. The recommended performance specifications for undetected errors may require additional airborne processing of the data beyond simple decoding. For example, these may be achieved by processing multiple samples of the same data words. 7.3.3.1.3 If the receiver does not acquire data required for the intended operation, a suitable warning is to be provided. 7.3.3.1.4 At the minimum signal power density the timeto acquire all data words required to support MLS/ RNAV operations (auxiliary data words B1-B41, A1/B42, A2, A3, A4/B43 and basic data word 6) must not exceed 20 seconds on a 95 per cent probability basis. The MLS/RNAV equipment has to ensure that the probability of undetected errors for this block of data does not exceed 0.5 × 10–9. This performance assumes a 2 dB improvement in signal to noise. This may be achieved through reduced cable loss, margin or improved receiver sensitivity (see the airborne power budget given in Table G-2). Additionally, with signal levels above this, the acquisition time is intended to be less than 20 seconds. 7.3.3.2 ata validation. After acquisition of data, the receiver repeatedly confirms that the data being received are the same as the acquired data. The receiver decodes several consecutive and identical data different from that previously acquired before taking action to accept the new decoded data. 7.3.3.2.1 For data required to support MLS/RNAV operations, the airborne equipment applies the cyclic redundancy check (CRC) to the data to ensure sufficient integrity has been achieved. Data that continue to be received continue to be validated. The MLS/RNAV equipment does not accept a new block of data to be used until it is validated with the CRC. 7.3.3.3 ata loss. Within 6 seconds after the loss of basic data or auxiliary data that is transmitted with a maximum interval of 2 seconds or less, the receiver provides a suitable warning and removes the existing data. Within 30 seconds after the loss of auxiliary data other than that referred to above, the receiver provides a suitable warning. 7.3.3.3.1 For data required to support MLS/RNAV operations, the airborne equipment does not remove existing data following validation except under the conditions described in 7.3.3.2.1. An MLS/RNAV data block that has been validated by the CRC is not removed until a new data block has been received with a different ground equipment identification in basic data word 6, a new MLS channel is selected, or power is removed. Additionally the data block is not removed when transitioning to back azimuth coverage. ATT G-25 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 7.3.4 Multipath performance 7.3.4.1 Where the radiated signal power density is high enough to cause the airborne equipment thermal noise contribution to be insignificant, the following specifications should apply for scalloping frequencies between 0.05 Hz and 999 Hz. 7.3.4.1.1 In-beam multipath. Multipath signals coded less than two beamwidths from the direct signal and with amplitudes of 3 dB or more below the direct signal should not degrade the angle guidance accuracy output by more than plus or minus 0.5 beamwidth (peak error). 7.3.4.1.2 Out-of-beam multipath. Multipath signals coded 2 beamwidths or more from the direct signal and with amplitudes of 3 dB or more below the direct signal should not degrade the angle guidance accuracy by more than plus or minus 0.02 beamwidth. 7.3.5 Clearance 7.3.5.1 The airborne equipment should provide clearance guidance information whenever the antenna is in the presence of a valid clearance guidance signal. 7.3.5.2 When the decoded angle indication is outside the proportional guidance sector defined in Chapter 3, Table A-7, the MLS guidance signal should be interpreted as clearance guidance. 7.3.5.3 When clearance pulses are transmitted, the receiver shall be able to process the range of pulse envelope shapes that may appear in the transition between clearance and scanning beam signals. A particular pulse envelope is dependent on the receiver position, scanning antenna beamwidth, and the relative phase and amplitude ratios of the clearance and scanning beam signals as shown in Figure G-8. The receiver is also required to process rapid changes of indicated angle of the order of 1.5 degrees (peak amplitude) when outside the proportional guidance limits. 7.3.5.4 In receivers with the capability to select or display azimuth angle guidance information greater than plus or minus 10 degrees, the proportional coverage limits in basic data must be decoded and used to preclude use of erroneous guidance. 7.4 Control and output 7.4.1 Approach azimuth and approach elevation deviation scale factor 7.4.1.1 Approach azimuth. When the approach azimuth deviation information is intended to have the same sensitivity characteristics as ILS, it is a function of the “approach azimuth antenna to threshold distance”, as supplied by the basic data, in accordance with the following table: Approach azimuth antenna to threshold Nominal distance (ATT) course width 0 – 400 m ± 3.6 degrees 500 – 1 900 m ± 3.0 degrees 2 000 – 4 100 m ± arctan ATT § ¨© ¹ · ¸ degrees 4 200 – 6 300 m ± 1.5 degrees 23/11/06 ATT G-26 2007/70/II. szám Attac ment G Annex 10 — Aeronautical Communications 7.4.1.2 Approach elevation. The deviation information is a continuous function of the manually or automatically selected elevation angle (Ĭ) in accordance with the formula Ĭ/4 = half a nominal glide path width, so that glide path widths are nominally in accordance with the following examples: Selected Nominal glide elevation angle path width (degrees) (degrees) ± 0.75 7.5 ± 1.875 Note.— These sensitivity characteristics are applicable to elevation angles up to 7.5 degrees. 7.4.2 Angle data output filter characteristics 7.4.2.1 Phase lags. To assure proper autopilot interface, the receiver output filter, for sinusoidal input frequencies, does not include phase lags which exceed:

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