Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2516

b) |Δz – żtr| – Q tr / Tn – Żgu tr ≤ 0 4.1.2.3.6.3 Track classification scheme Established rate track. An altitude track is classified as established rate if two or more successive transitions are observed in the same direction and the time interval between the two transitions is sufficiently short that the track classification would not be changed to level track during that interval (see the definition of level track), or if an observed transition is opposite in direction to an existing trend and the time since the previous transition is “unexpectedly small” (4.1.2.3.6.8.1). Level track. An altitude track is classified as level if reports are received at the same level for longer than T1 after the time at which the next transition was expected, if one was expected, or for more than T2 whether or not a transition was expected (4.1.2.3.6.3.1). New track. An altitude track is classified as new during the period between the time of the first altitude report and the first transition or until T2 has elapsed (4.1.2.3.6.3.1). Oscillating track. An altitude track is classified as oscillating if a transition occurs in the opposite direction to that of the immediately preceding transition, only one level has been crossed, the time interval between the two transitions is Attachment Annex 10 — Aeronautical Communications ATT-41 22/11/07 sufficiently short that the track classification would not be changed to level track during that interval (see the definition of level track) and, if the track was classified as established rate, the time since that transition is not “unexpectedly small” (4.1.2.3.6.8.1). Unconfirmed rate track. An altitude track is classified as unconfirmed rate if a transition occurs for a new or for a level track or if a transition in the opposite direction to the previous transition occurs and more than one level has been crossed for an established, oscillating or unconfirmed rate track. 4.1.2.3.6.3.1 The following values are used: T1 = 4.0 s T2 = 20 s 4.1.2.3.6.3.2 If a track is already classified as unconfirmed rate and a transition occurs in the opposite direction to the previous one and more than one level has been crossed, the altitude rate is determined as if the track had just become classified as unconfirmed rate (4.1.2.3.6.5). 4.1.2.3.6.3.3 The tracks are classified (4.1.2.3.6.3), and the transitions between track classifications are shown in Figure A-10. Tracks are classified in order to determine how new measurements should be used to update the altitude rate estimate. 4.1.2.3.6.4 The magnitude of the rate is set to zero if the track is new, level or oscillating. 4.1.2.3.6.4.1 The quantities ε and bż are set to zero and tb to 100 s. 4.1.2.3.6.4.2 When a track is classified as level, all earlier transitions and any current trend are disregarded. 4.1.2.3.6.5 The magnitude of the rate is set to Żgu when a track first becomes unconfirmed rate and then decayed each cycle from the value determined the previous cycle until another transition is observed. 4.1.2.3.6.5.1 The value of Żgu is 2.4 m/s (480 ft/min) and the decay constant is 0.9. 4.1.2.3.6.5.2 The quantities ε and bż are set to zero and tb to Q/ |ż| 4.1.2.3.6.6 For established rate tracks the magnitude of the rate is set to the quantization interval divided by the estimated level occupancy time. The level occupancy time is estimated on receipt of transitions in the direction of the trend and held constant until the next transition either occurs or becomes overdue (4.1.2.3.6.7). 4.1.2.3.6.6.1 When a track is first established, the quantities ε, bż and tb are set as follows: ε = 0, bż = 1, tb = maximum (tp, 1.4 s) 4.1.2.3.6.6.2 Unless the transition is early or late (4.1.2.3.6.6.3), the quantities ε, bż and tb are calculated by recursive averaging following the third and subsequent transitions as follows: ε' = 0.8ε* + (tp – tb *) * * 2 ( ) [( ) ] b n b n t T t T ∫ − β = + bż = bż * + bt and Annex 10 — Aeronautical Communications Volume IV 22/11/07 ATT-42 maximum ( , ) and t z b b ∫ β = β  ε = ε' for |ε'| ≤ 1.35 (or 2.85 if the most recent transition was observed following one or more missing reports); bż = 3 and ß = 0.5 and ε = 0.3ε' otherwise; and in both cases: tb = tb * + ß(tp – tb *). 4.1.2.3.6.6.3 Early or late transitions If |tp – tb *| > 1.5 s (or 3.0 s if the most recent transition was observed following one or more missing reports) or bt lies outside the range (tr/tb * + 1.1) ≥ bt ≥ (tr/tb * – 1.1), then the quantities ε, bż and tb are set as follows: bż = 1 ε = 0 tbm = minimum ((0.7tp + 0.3tb *), 1.4 s) tb = maximum (tp, tbm). The rate is calculated as: ż = dtQ/tb. 4.1.2.3.6.7 Overdue transition. The magnitude of the rate is decayed on each cycle from the value obtained on the previous cycle if reports are received at the same level for at least T3 after the time of the next expected transition (or T4 if the most recent transition was observed following one or more missing reports). The value of tb is not changed in these circumstances. 4.1.2.3.6.7.1 The following values are used: T3 = 1.5 s T4 = 3.0 s The following formula for rate decay is used: ż = dtQ/[tb + (0.3tb + 0.5Tn) (0.7 + (tl – tb)/Tn)2] where tl = time since the most recent transition, s. 4.1.2.3.6.7.2 The quantity bż is set to maximum (2, bż * – 1). 4.1.2.3.6.8 Transitions due to jitter. The magnitude of the rate is set to the value obtained on the previous cycle if a transition is observed opposite in direction to that of the trend, the immediately preceding transition followed the trend, only one level has been crossed and the time since the immediately preceding transition is “unexpectedly small”. Such a transition is subsequently treated as missing except for the requirements of 4.1.2.3.4 and 4.1.2.3.6.10 e). Attachment Annex 10 — Aeronautical Communications ATT-43 22/11/07 4.1.2.3.6.8.1 The time since the immediately preceding transition is declared “unexpectedly small” when tp ≤ 0.24 tb *. 4.1.2.3.6.8.2 The quantities ε, bż and tb are not changed. 4.1.2.3.6.9 Track high confidence declaration. “High” confidence in the tracked rate is declared when the current altitude report is credible and one or more of the following conditions are met:

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