Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2582

6. PERFORMANCE OF THE COLLISION AVOIDANCE LOGIC 6.1 Purpose of the performance requirements 6.1.1 The ACAS collision avoidance logic is the part of ACAS that receives information relating to identified intruders (i.e. any aircraft for which ACAS has established a track) and generates collision avoidance advisories on the basis of that information. In any ACAS equipment it is likely to take the form of software residing in a microprocessor and this software will implement a collection of mathematical algorithms. These algorithms might vary from one ACAS to another and the purpose of the performance requirements for the collision avoidance logic is to ensure that the performance of the mathematical algorithms is acceptable. 6.1.2 The development of the collision avoidance algorithms and their implementation as software are thought of as separate processes and these standards relate to the algorithms, even though, in practice, the software used to demonstrate that the algorithms are satisfactory might be closely related to that installed with ACAS. The performance requirements for the collision avoidance logic are not intended to guarantee that the collision avoidance software is satisfactory as software, though they are an essential ingredient of such a guarantee. Satisfactory performance of the software is to be achieved by using sound software engineering practices to ensure that the algorithms are implemented reliably. 6.1.3 The interoperability of the collision avoidance logics in any two equipments is achieved by ensuring that their RAs are consistent and that either RA alone is sufficient for the purpose of the system as a whole. Consistency is ensured by the requirements relating to coordination (Chapter 4, 4.3.5.5.1, 4.3.5.8 and 4.3.6.1.3). That either RA is sufficient is guaranteed by the collision avoidance logic performance requirements and, in particular, the requirement of satisfactory performance when the other aircraft is ACAS equipped but does not cooperate (Chapter 4, 4.4.2.1 j) 2)). 6.1.4 The performance requirements are intended to provide a global guarantee that the ACAS logic in question has an overall performance that is comparable with or superior to that of other ACAS logics. They do not describe the performance of the logic in any particular airspace. For many purposes, the best method of determining or studying the performance of an ACAS logic in a particular airspace is by means of simulations based on ATC ground radar data. This possibility is discussed further in 6.4.4. 6.2 Conditions under which the requirements apply 6.2.1 COMMENT The conditions given in Chapter 4, 4.4.2 are specified in order to define the subsequent requirements, but satisfactory performance is required in all normal operating conditions. This is to be demonstrated by varying the conditions in which the performance measures are calculated in a way that reflects the normal variations that might be expected and ensuring that the calculated performance measures are robust, i.e. that they do not degrade sharply as the conditions assumed deteriorate. Attachment Annex 10 — Aeronautical Communications ATT-57 22/11/07 6.2.2 SURVEILLANCE ERRORS 6.2.2.1 Surveillance errors can take a number of forms:

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