[CESG] CESG-P-2022-11-001 Approval to publish CCSDS 124.0-B-1, Robust Compression of Fixed-Length Housekeeping Data (Blue Book, Issue 1)

[CCSDS Secretariat]

Dear CESG Members,

Conditions for approval of CCSDS 124.0-B-1, Robust Compression of Fixed-Length Housekeeping Data (Blue Book, Issue 1) have been disposed to the satisfaction of the AD(s) who voted to approve with conditions. The Secretariat will now proceed with CMC polling to authorize publication.
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From:	Barkley, Erik J (US 3970) <erik.j.barkley at jpl.nasa.gov>
Sent:	Wednesday, January 11, 2023 7:36 PM
To:	Wong, Englin (GSFC-5670)
Cc:	Thomas Gannett; David Evans; Lucana Santos
Subject:	RE: [EXTERNAL] Re: CESG-P-2022-11-001 Approval to publish CCSDS 124.0-B-
1, Robust Compression of Fixed-Length Housekeeping Data (Blue Book, Issue 
1)

Hi Mark,

Thanks for the input.  This is good stuff.  Can we just add a note in the test report that says 
something like you wrote – i.e., something like the core algorithm was tested on a LEON2 80 
MHz radiation tolerant processor and found to have minimal impact.  Just adding something 
like that to the test report addresses my concern.

-Erik

From: Wong, Englin (GSFC-5670) <mark.wong at nasa.gov>  
Sent: Wednesday, January 4, 2023 11:22 
To: Barkley, Erik J (US 3970) <erik.j.barkley at jpl.nasa.gov> 
Cc: Thomas Gannett <thomas.gannett at tgannett.net>; David Evans <David.Evans at esa.int>; Lucana 
Santos <Lucana.Santos at esa.int> 
Subject: FW: [EXTERNAL] Re: CESG-P-2022-11-001 Approval to publish CCSDS 124.0-B-1, Robust 
Compression of Fixed-Length Housekeeping Data (Blue Book, Issue 1)

Hi Erik,

The core algorithm had been tested and implemented on a LEON-2 80 MHz processor, i.e. a typical ESA 
flight computer. The implementation reported that it has minimal impact when implemented on the 
flight computer.
A reference paper is attached here for your discretion. 

Please let us know if you need more clarification.

Thanks,
Mark Wong 
NASA GSFC Flight Microwave & Telecommunication Systems Branch
Phone: 1-301-286-6549 

From: David Evans <David.Evans at esa.int>  
Sent: Wednesday, January 4, 2023 1:06 PM 
To: Milenko Starcik <milenko.starcik at visionspace.com>; Wong, Englin (GSFC-5670) 
<mark.wong at nasa.gov> 
Cc: Lucana Santos <Lucana.Santos at esa.int>; Miguel.Hernandez at uab.cat 
Subject: RE: [EXTERNAL] Re: CESG-P-2022-11-001 Approval to publish CCSDS 124.0-B-1, Robust 
Compression of Fixed-Length Housekeeping Data (Blue Book, Issue 1)

Hi Mark,

Here is a paper I wrote in 2018 on POCKET+. This was ground tested with a LEON 2 80 MHz processor i.e. 
a typical ESA flight computer. See below for the relevant section summary. The core architecture of the 
algorithm is the same as CCSDS 124 so we can state with confidence that “the CCSDS 124 algorithm can 
achieve reasonable speed for implementation” on a typical space computer.
Can you forward this to Erik to see if that is enough?

Best regards,
Dave

VIII. Performance and CPU Usage Results  
…..The rather remarkable result was the amount of CPU usage (based on LEON 2 80 MHz processor) 
recorded. This was negligible, being around 0.03% in packets that were highly compressible and rising to 
only 0.11% in packets that did not compress well (44.91% compression). It rose slightly when using 
robust chain mode but never reached more than 0.13%.
Notes: Robust chain mode is equivalent to CCSDS 124.