Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2483

c) When any of these conditions are satisfied, the running sum continues to be incremented and decremented even though its value may exceed 20. 3.1.3.8 MODE S RANGE ACQUISITION 3.1.3.8.1 The equipment should transmit an acquisition interrogation (UF = 0, 16, AQ = 1, Chapter 3, 3.1.2.8.1.1) to determine the range of each valid target with relative altitude as defined above, or from which inadequate altitude information has been received. 3.1.3.8.2 If an acquisition interrogation fails to elicit a valid reply, additional interrogations should be transmitted. The total number of acquisition interrogations addressed to a single target must not exceed three within a single surveillance update period. The first acquisition interrogation is to be transmitted using the top antenna. If two acquisition interrogations to a target fail to elicit valid replies, the next two acquisition interrogations to that target are to be transmitted using the bottom antenna. If in the acquisition attempt in the first surveillance update period, valid replies are not received, ACAS transmits a total of nine acquisition interrogations distributed over the first six successive surveillance update periods. If acquisition interrogations fail to elicit replies within six surveillance update intervals, the acquisition process is to cease until enough additional squitters/fruit are received indicating that a successful acquisition is likely. One means of accomplishing this is to process subsequent squitters/fruit as described in 3.1.3.7, but with the increment 16 replaced by 8. If a second failure to acquire occurs, the process is repeated with an increment of 4. After any subsequent failure, an increment of 2 is used. 3.1.3.8.3 If additional attempts are made to acquire the target, they conform to the pattern described above except that:

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