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SAC-PDG-RPR  April 2019

SAC-PDG-RPR April 2019

Subject:

Re: Drafting Group meeting minutes 10-Apr

From:

Rene Verhage <[log in to unmask]>

Reply-To:

SAC-PDG-RPR <[log in to unmask]>

Date:

Thu, 11 Apr 2019 08:22:09 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (26 lines)

Please find below the links to the two spreadsheets shown in the 2019-04-10 meeting. These are updated versions of the files used for and posted after the meeting two weeks earlier.
The most important changes:

PCR-RPR-xxx IFF - Analysis Interfaces.xlsx
(https://www.sisostds.org/DigitalLibrary.aspx?Command=Core_Download&EntryId=49906)
- 'Class Structure V2.2':
  * TCAS is not a specialization of CivilTransponder, but immediately derives from the root IFF object class. Reason is that in DIS the TCAS/ACAS is classified neither as transponder nor as interrogator, but as "transceiver". Although it is typically an 'add-on' to a transponder, in fact an interrogation capability is added. Do note that it is advised not to use a dedicated TCAS/ACAS (System Type 14) IFF PDU/object unless high-fidelity requirements demand otherwise (see IEEE 1278.1-2012 section B.5.15.1).
  * Draft designs added for an interaction class structure. During the meeting a preference was expressed for alternative D. Note, however, that the discussion is still open, e.g. on the necessity to have specializations of the IFFReply, IFFSquitter, and IFFInterrogation classes.
- 'Allocation grouped V2.2':
  * The modified structure regarding TCAS shows the additional benefit of no more interfaces with an orange background, i.e. interfaces not required by any system instance (compare to the sheet 'Allocation grouped V2'). Do note that interfaces with a yellow background (not required by all system instances) do remain in this structure.
- 'Interfaces':
  * Some correction to attributes/fields, resulting in the removal of interface 'MarkXIISpecial' and the addition of interface 'CivilSquawk'.

PCR-RPR-xxx IFF - Analysis Fields V2.2.xlsx
(https://www.sisostds.org/DigitalLibrary.aspx?Command=Core_Download&EntryId=49907)
- Some corrections / different interpretations of applicability of fields to IFF systems (please feel free to verify against IEEE 1278.1-2012 !!).
- Draft allocation of required and optional fields to RPR FOM attributes according to Class Structure V2.2. Attributes with yellow background indicate new or (proposed) changed attributes. An orange background indicates that some discussion in the DG is preferable, whereas a red background indicates such a discussion is necessary.
- Comments are provided to several cells with additional clarification, e.g. to the issue to be discussed.

Please note that this is all draft material, created mainly for the analysis of the IFF capabilities in DIS to be able to generate a detailed RPR FOM PCR. No PCR has been written yet, and no draft of RPR FOM v3.0 exists at this moment. As written in the DG meeting minutes, the next step is to develop an experimental FOM module to gather more experience on the ability to implement the discussed IFF class structure and attribute allocation.

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