Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4681

(3) The variables in these inequalities shall be defined as follows: it = number of interrogations (Mode A/C and Mode S) transmitted in a 1 s interrogation cycle; i = index number for Mode A/C and Mode S interrogations, i = 1, 2,..., it; α = the minimum of α1 calculated as 1/4 [nb/nc] subject to the special conditions given below and α2 calculated as Log10 [na/nb] / Log10 25, where nb and nc are defined as the number of operating ACAS II and ACAS III equipped aircraft (airborne or on the ground) within 11.2 km (6 NM) and 5.6 km (3 NM) respectively, of own ACAS (based on ACAS surveillance). ACAS aircraft operating at or below a radio altitude of 610 m (2 000 ft) AGL shall include both airborne and on-ground ACAS II and ACAS III aircraft in the value for nb and nc. Otherwise, ACAS shall include only airborne ACAS II and ACAS III aircraft in the value for nb and nc. The value of α is further constrained to a minimum of 0.5 and a maximum of 1.0. In addition; IF [(nb < 1) OR (nb > 4nc) OR (nb < 4 AND nc < 2 AND na > 25)] THEN α1 = 1.0, IF [(nc > 2) AND (nb > 2 nc ) AND (na < 40)] THEN α1 = 0.5; p(i) = peak power radiated from the antenna in all directions of the pulse having the largest amplitude in the group of pulses comprising a single interrogation during the ith interrogation in a 1 s interrogation cycle, W; m(i) = duration of the mutual suppression interval for own transponder associated with the ith interrogation in a 1 s interrogation cycle, s; B = beam sharpening factor (ratio of 3 dB beam width to beamwidth resulting from interrogation side-lobe suppression). For ACAS interrogators that employ transmitter side-lobe suppression (SLS), the appropriate beamwidth shall be the extent in azimuth angle of the Mode A/C replies from one transponder as limited by SLS, averaged over the transponder population; { } see 4.2.3.3.3 Pa(k) " k " kt " na " p i( ) --------- α i = i1 ∑ na + -------------- 11 α2 ----- , m i( ) i = i1 ∑ B--- Pa k ( ) ------------- k = k1 ∑ na + -------------- 3, 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 4-8 Note.— RA and ACAS broadcasts (4.3.6.2.1 and 4.3.7.1.2.4) are interrogations. 4.3.2.2.2.2.1 Transmissions during RAs. All air-to-air coordination interrogations and RA and ACAS broadcasts shall be transmitted at full power and these interrogations shall be excluded from the summations of Mode S interrogations in the left-hand terms of inequalities (1) and (2) in 4.3.2.2.2.2 for the duration of the RA. 4.3.2.2.2.2.2 Transmissions from ACAS units on the ground. Whenever the ACAS aircraft indicates that it is on the ground, ACAS interrogations shall be limited by setting the number of other ACAS II and III aircraft (na) count in the interference limiting inequalities to a value that is three times the value obtained based on ACAS broadcasts received with a transponder receiver threshold of –74 dBm. Whenever Mode A/C interrogation power is reduced because of interference limiting, the Mode A/C interrogation power in the forward beam shall be reduced first until the forward sequence matches the right and left sequences. The forward, right and left interrogation powers shall then sequentially be reduced until they match the rear interrogation power. Further reduction of Mode A/C power shall be accomplished by sequentially reducing the forward, side and rear interrogation powers. 4.3.2.2.2.2.3 Transmissions from ACAS units above 5 490 m (18 000 ft) altitude. Each ACAS interrogator operating above a pressure altitude of 5 490 m (18 000 ft) shall control its interrogation rate or power or both such that inequalities

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