Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4680

e) the minimum slant range is equal to or greater than 300 m (1 000 ft). 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 4-6 Table 4-1 4.3.2.1.1.1 ACAS shall continue to provide surveillance with no abrupt degradation in track establishment probability as any one of the condition bounds defined in 4.3.2.1.1 is exceeded. 4.3.2.1.1.2 ACAS shall not track Mode S aircraft that report that they are on the ground. Note.— A Mode S aircraft may report that it is on the ground by coding in the capability (CA) field in a DF = 11 or DF = 17 transmission (Chapter 3, 3.1.2.5.2.2.1) or by coding in the vertical status (VS) field in a DF = 0 transmission (Chapter 3, 3.1.2.8.2.1). Alternatively, if the aircraft is under Mode S ground surveillance, ground status may be determined by monitoring the flight status (FS) field in downlink formats DF = 4, 5, 20 or 21 (Chapter 3, 3.1.2.6.5.1). 4.3.2.1.1.3 Recommendation.— ACAS should achieve the required tracking performance when the average SSR Mode A/C asynchronous reply rate from transponders in the vicinity of the ACAS aircraft is 240 replies per second and when the peak interrogation rate received by the individual transponders under surveillance is 500 per second. Note.— The peak interrogation rate mentioned above includes interrogations from all sources. 4.3.2.1.2 False track probability. The probability that an established Mode A/C track does not correspond in range and altitude, if reported, to an actual aircraft shall be less than 10–2. For an established Mode S track this probability shall be less than 10–6. These limits shall not be exceeded in any traffic environment. 4.3.2.1.3 RANGE AND BEARING ACCURACY 4.3.2.1.3.1 Range shall be measured with a resolution of 14.5 m (1/128 NM) or better. 4.3.2.1.3.2 Recommendation.— The errors in the relative bearings of the estimated positions of intruders should not exceed 10 degrees rms. Note.— This accuracy in the relative bearing of intruders is practicable and sufficient as an aid to the visual acquisition of potential threats. In addition, such relative bearing information has been found useful in threat detection, where it can indicate that an intruder is a threat. However, this accuracy is not sufficient as a basis for horizontal RAs, nor is it sufficient for reliable predictions of horizontal miss distance. 4.3.2.2 INTERFERENCE CONTROL 4.3.2.2.1 Maximum radiated RF power. The effective radiated power of an ACAS transmission at 0 degree elevation relative to the longitudinal axis of the aircraft shall not exceed 27 dBW. 4.3.2.2.1.1 Unwanted radiated power. When ACAS is not transmitting an interrogation, the effective radiated power in any direction shall not exceed –70 dBm. 4.3.2.2.2 Interference limiting. Each ACAS interrogator operating below a pressure altitude of 5 490 m (18 000 ft) shall control its interrogation rate or power or both so as to conform with specific inequalities (4.3.2.2.2.2). Conditions Performance Quadrant Maximum traffic density Maximum number of other ACAS within 56 km (30 NM) Probability of success Forward Side Back Maximum closing speed aircraft/ km2 aircraft/ NM2 m/s kt m/s kt m/s kt 0.087 0.30 0.90 1 200 0.017 0.06 0.90 2007/70/II. szám Chapter 4 Annex 10 — Aeronautical Telecommunications 4-7 28/11/02 4.3.2.2.2.1 Determination of the number of other ACAS. ACAS shall count the number of other ACAS II and III interrogators in the vicinity to ensure that the interference limits are met. This count shall be obtained by monitoring ACAS broadcasts (UF = 16), (4.3.7.1.2.4). Each ACAS shall monitor such broadcast interrogations to determine the number of other ACAS within detection range. 4.3.2.2.2.2 ACAS interference limiting inequalities. ACAS shall adjust its interrogation rate and interrogation power such that the following three inequalities remain true, except as provided in 4.3.2.2.2.2.1. { } < minimum

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