Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4807

c) rear beam: 13 dB for Mode S and 1 dB for Mode A/C. In addition, the Mode A/C and Mode S surveillance power and sensitivity reductions for ACASs that are airborne or on the ground are to be accomplished such that the ACAS equipment is not prematurely limited and has the capability of using at least 75 per cent of the allowance specified in the three limiting equations for all mixes of target types and for all densities up to the maximum density capability of the system. When the value of any of the smoothed limits is exceeded, the appropriate action is required to limit interference within one surveillance update interval. Means are to be provided for gradually restoring the surveillance sensitivity when the environment subsequently improves enough to allow the interference limits to be relaxed. 3.2.3.7.7 ACAS cross-link interrogations are included in the summation of Mode S interrogations in the left-hand terms of the interference limiting inequalities. 3.2.3.8 IMPLEMENTATION OF A TYPICAL 3.2.3.8 INTERFERENCE LIMITING PROCEDURE 3.2.3.8.1 The following describes one possible implementation of an interference limiting procedure. It varies the system parameters appearing in inequalities (1), (2) and (3) to maximize and maintain approximate equality between the estimated surveillance ranges for Mode S and Mode A/C targets. In evaluating these inequalities, 8-second averages of the Mode S parameters are used, and current or anticipated values of the Mode A/C parameters are used. The procedure is illustrated in the flow chart of Figure A-4. α2 = Log10[na/nb] Log1025 2007/70/II. szám Annex 10 — Aeronautical Telecommunications Volume IV 28/11/02 ATT-20 Figure A-4. Interference limiting flow diagram FOR MODE S REDUCE POWER 1 dB INCREASE MTL 1dB FOR MODE S INCREASE POWER 1 dB REDUCE MTL 1 dB SET 8 S FREEZE ON OTHER CHANGES RETURN DOES MODE S RANGE EXCEED MODE C RANGE? CAN MODE S RANGE BE INCREASED? WILL ADDING A W-S STEP VIOLATE INEQUALITY

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