PAS Burst mode issues
=====================
== Problem #1: Burst mode events
=== Description
Some events can be triggered at the end of PAS burst mode period
==== 2021/06/11 22:06
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==============================================
SWA EVENTS for 2021-06-11 : Low/Med/High without HIS ones
==============================================
APID ( 99, 7) TM ( 5, 2) SEQ (05632,3) Size = 6 2021-06-11T22:06:06.454 : SID 43533 : SWA_E_PAS_MISS_HEAD_SCI_PKT
APID ( 99, 7) TM ( 5, 2) SEQ (05633,3) Size = 6 2021-06-11T22:06:10.173 : SID 43563 : SWA_E_EXOS_LL_EVENT
APID ( 99, 7) TM ( 5, 2) SEQ (05634,3) Size = 4 2021-06-11T22:06:14.451 : SID 43529 : SWA_E_PAS_WR_SCI_HEAD
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See http://solarorbiter.irap.omp.eu/tests/aux/20210611/SWA_EVENT.txt
.Corresponding plot
image:documents/BURST/20210611.burst-event.png[width="100%"]
== Problem #2: Missing FS during burst mode sequences
=== __2021/06/21__ Problem identified
The problem was identified!
It seems there is a problem onboard during compression process, and the corresponding data packets are not complete.
When uncompressing some full-sampling data (burst-mode or snapshots) with 80 energies x 7 elevation x 9 CEM,
it should produce an uncompressed data buffer of 80 x 7 x 9 (int_16) = 12320 bytes
Obviously, in some cases, we got only 12288 bytes.
These packet were identified as "Uncomplete data: compressed_size < expected_size" and rejected by data processing software,
that leads to such "Missing FS"
A complete PAS Burst-mode sequence has a duration of 300 samples of 1s each.
Each 1s sample could be:
- full-sampling, with maximum energy, elevation and azimuth resolution
- composed of K=4 sub-sampling per second, with lower resolution
In a complete PAS BM sequence, we must find 15 full-sampling, one each 20s.
=== Exemple of a complete burst-mode sequence
Each Burst mode sequence is composed of :
- leading full-sampling
- 19 partial sub-sampling (x K = 4 sub-sampling per seconds)
- full-sampling
- 19 partial sub-samplings (x K = 4 sub-samplings)
- full-sampling
- etc...
The scheme is repeated 15 times => 15 * 20 = 300 seconds
We should find a full-sampling for samples #1, 21, 41, 61, ..., 281
CAUTION: there is no full-sampling at then end of the sequence
=== Example 2021/05/31 04:39
The Full_3D pannel indicates such full-sampling samples.
There can be also detected in NB_ENERGY or NB_ELEVATION pannels
image:documents/BURST/20210531_0439_0446.burst.png[width="100%"]
=== Burst mode configuration
The parameters N=15 , L=19, and K=4 are specified in PAS configuration
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include::../documents/BURST/20210531.burst.conf[]
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=== Full-sampling statistics
==== 2021/05/31
Burst mode are select each 1/4H (62 times from 04 to 22:30)
We can find the expected number of FS (62/62)
----
include::../documents/BURST/20210531.burst.FS.stat[]
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==== 2021/06/01
Here also, burst mode each 1/4H, starting at 16:00
But a DPU reboot occurs at 18:29
However, we could find the expected number of FS (6/6 = 100%)
----
include::../documents/BURST/20210601.burst.FS.stat[]
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=== Uncomplete burst-mode sequence
After the latest DPU reboot, PAS configuration parameters for Burst mode sequence were modified.
The following parameters were updated:
- FirstEnergy: from 4 to 14
- EnegyNums: from 90 to 80
- FirstElev: from 0 to 1
- ElevNum: from 9 to 7
Burst mode was also no more selected than 2 times per day.
----
include::../documents/BURST/20210610.burst.conf[]
----
==== 2021/06/10
We can see here missing FS during the first BM sequence.
We should have 15 FS (one each 20s), but there are only 8 FS available in PAS telemetry.
.First BM 14:27
image:documents/BURST/20210610_1427.burst.png[width="100%"]
Same problem during the second sequence, only 9/15 FS.
We received also some events (see problem #1).
.Second BM 22:00
image:documents/BURST/20210610_2200.burst.png[width="100%"]
==== Statistics
[red]#Uncomplete FS (50%) for samples 1, 41, 61, 81, 141, 161#
----
include::../documents/BURST/20210610.burst.FS.stat[]
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==== 2021/06/11
.First BM 14:27
image:documents/BURST/20210611_1427.burst.png[width="100%"]
.Second BM 22:00
image:documents/BURST/20210611_2200.burst.png[width="100%"]
[red]#Uncomplete FS (50%) but for different samples#
----
include::../documents/BURST/20210611.burst.FS.stat[]
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==== 2021/06/12
.First BM 14:27
image:documents/BURST/20210612_1427.burst.png[width="100%"]
.Second BM 22:00
image:documents/BURST/20210612_2200.burst.png[width="100%"]
[red]#Uncomplete FS (50%) but for different samples#
----
include::../documents/BURST/20210612.burst.FS.stat[]
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