Implement AOS Transfer Frames

[aywaldron]

Small sat missions use AOS transfer frames rather than TM transfer frames.

AIT-DSN/ait/dsn/sle/frames.py

Line 83 in 7fb34ea

class AOSTransFrame(object):

• Configuration of transfer frame also needs to be defined in sle_tlm.yaml
  https://github.com/NASA-AMMOS/AIT-DSN/blob/master/ait/dsn/sle/frames.py
• TMTransFrame referenced in raf.py and rcf.py - these would need to be changed (also in ait_sle_bridge.py example)
• RAF sends frame._data to telem socket in RAF._transfer_data_invoc_handler - needs to be changed either by sub-classing or explicitly overwriting self._handlers for that handler type (frame._data is filled in frame class in frames.py)
  

  AIT-DSN/ait/dsn/sle/raf.py

  Line 328 in 7fb34ea

  tmf = frames.TMTransFrame(tm_data)

[kmarwah]

Hey, I'm working with the LunaH-Map team and I'm currently working on implementing this. It should be done in a few days or so. Can you please explain the changes required in RAF._transfer_data_invoc_handler in greater detail? Thanks!

[aywaldron]

Hi @kmarwah, that's great to hear! So the last two bullet points above are referring to the same thing, the last one is just providing detail. The code in RAF here

AIT-DSN/ait/dsn/sle/raf.py

Line 337 in 9e1e0c4

tmf = frames.TMTransFrame(tm_data)

and in RCF here

AIT-DSN/ait/dsn/sle/rcf.py

Line 404 in 7fb34ea

tmf = frames.TMTransFrame(tm_data)

uses the TMTransFrame. If you will be using RAF or RCF with the AOSTransFrame instead, then you will need a way to change the frame that the _transfer_data_invoc_handler uses, or write a new handler. It may make the most sense to add a parameter to the RAF/RCF classes for the type of transfer frame to use, which defaults to TMTransFrame, and which the handler then references (@MJJoyce any thoughts on that?)

[aywaldron]

@kmarwah implemented AOS transfer frames using the Iris radio's ICD (see PR #69 for details). This implementation should be expanded to match the CCSDS's AOS spec, https://public.ccsds.org/Pubs/732x0b3e1.pdf