[SLS-DC] CCSDS DC - SAR compression meeting summary: action item updates

[Wong, Englin (GSFC-5670)]

Here are the updated action items for the SAR compression based on feedback from DLR.


What the working group agrees on:

  1.  The 16-bit I and 16-bit Q inputs to FDBAQ are adequate for the current SAR instrument. The 16-bit input provides 80 dB of dynamic range, which is plenty.
  2.  The working group concluded that to minimize the ADC description, a more focused description of the input data format is needed. Currently, there is a description of integer input, but fractional equations are present in the white book.
  3.  UAB agrees to support DLR in the next iteration of the white book. This is an attempt to move the white book towards a more CCSDS-compliant write-up.



Open questions:

  1.  The definition of the input mid-raised quantizer is inherited from BAQ. However, it is unclear if this is the optimal solution. An investigation into the BAQ might be needed.
  2.  Multiple LUTs described in the white book refer to optimization based on SAR instrument calibration. It is unclear how these steps are performed. The working group agrees that optimization is important for users to recreate these tables. Questions regarding additional inputs such as thermal noise, SQNR, and compression rate could potentially be defined as input parameters were raised.
  3.  The discussion also touched on Huffman coding table and discuss the generation of this table is also based on the optimization. The optimization is based on SQNR and compression rate.



Action Items:

  1.  ESA to upload the DLR white book response excel sheet to share drive.
  2.  DLR will provide a reference list to FDBAQ for the working group. (DLR: by 8/15/2023)
  3.  DLR will also provide a potential min/max SQNR range for the SAR instrument. This may depend on the input bit-width. (DLR: During Fall meeting)
  4.  DLR will review the full FDBAQ documentation (including the TNs to be delivered by ESA) and identify the key aspects to be included in the description of the standard. (DLR: by Fall meeting)
  5.  The working group will provide written feedback to the current white book draft one month before the next meeting (ALL: By 10/5/2023).

Best,
Mark

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Mark Wong, Ph.D.
NASA/Goddard Space Flight Center
Flight Microwave & Telecommunication Systems Branch/Code 567
Greenbelt, MD 20771
B19 Rm S030
Phone: 1-301-286-6549
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