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  1. SAFe Program
  2. SP-1602

Further development of the SKA1-LOW station model (StatSim)

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      As a SKA1-LOW engineer, I want a detailed parameterised signal chain model to improve understanding and assess requirements and the impact of design choices on the stability of the station performance.

      Show
      As a SKA1-LOW engineer, I want a detailed parameterised signal chain model to improve understanding and assess requirements and the impact of design choices on the stability of the station performance.
    • Hide

      To be refined at PI planning - see description for some possible routes this could take.

       

      Show
      To be refined at PI planning - see description for some possible routes this could take.  
    • 1
    • 1
    • 25
    • Team_SCHAAP
    • Sprint 5
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      1. A page has been created (https://confluence.skatelescope.org/display/SWSI/SKA-LOW+Station+Behaviour+Simulation) in the Solution Intent Space linking to the page in the TDT space describing the model.
      2. The code has been moved to its own repo (https://gitlab.com/ska-telescope/sim/ska-low-station-behavior) with standard documentation added (deployed via developer portal).
      3. The results of this analysis are presented on https://confluence.skatelescope.org/display/TDT/Analysis+of+the+impact+of+gain+variations
      4. We have had several discussions, in which we concluded that temperature data may help to correct for the average (common) gain variations of the all receive paths, but that effect will already be corrected by direction-independent calibration at array level.
      5. This comparison is presented at https://confluence.skatelescope.org/display/TDT/Analysis+of+the+impact+of+gain+variations
      6. This will be the main topic of the telecon on May 25. Moreover, a Master's student has an interest in working on SKA-LOW station simulation, so we should define a suitable piece of work so that that projects contributes to bringing the discussions further.
      7. No data became available.

      Show
      1. A page has been created ( https://confluence.skatelescope.org/display/SWSI/SKA-LOW+Station+Behaviour+Simulation ) in the Solution Intent Space linking to the page in the TDT space describing the model. 2. The code has been moved to its own repo ( https://gitlab.com/ska-telescope/sim/ska-low-station-behavior ) with standard documentation added (deployed via developer portal). 3. The results of this analysis are presented on https://confluence.skatelescope.org/display/TDT/Analysis+of+the+impact+of+gain+variations 4. We have had several discussions, in which we concluded that temperature data may help to correct for the average (common) gain variations of the all receive paths, but that effect will already be corrected by direction-independent calibration at array level. 5. This comparison is presented at https://confluence.skatelescope.org/display/TDT/Analysis+of+the+impact+of+gain+variations 6. This will be the main topic of the telecon on May 25. Moreover, a Master's student has an interest in working on SKA-LOW station simulation, so we should define a suitable piece of work so that that projects contributes to bringing the discussions further. 7. No data became available.
    • 11.4
    • Stories Completed, Outcomes Reviewed, Satisfies Acceptance Criteria, Accepted by FO

    • PI22 - UNCOVERED

    Description

      Following the valuable outcome of SP-1440, this ticket is a timeboxed activity to continue to develop this code for use by SKA1-LOW engineers.

      Following a Zoom discussion on the 25-02-21 (between s.wijnholds, m.waterson, d.hayden, r.laing, and b.mort) and in System Demo 9.5 a number of possible next steps have been identified including. Note that this no doubt far from a complete or comprehensive list and not all aspects are expected to be completed in PI10.

      1. The documentation should be linked to the code and made available (either by linking or embedding relevant pages in the Solution Intent Space).
      2. Split out the StatSim code into its own repo in the Gitlab simulation project group - this possibly should be done before item 1 (above).
      3. Assess the residual gain variations remaining after applying nominal gain corrections based on a fixed calibration table, i.e, assess the residual gain variations after the static inter-receive path variations have been corrected.
      4. Investigate whether those residual gain variations can be reduced further by applying additional corrections (on top of those from the calibration table) based on either the outside temperature or based on temperature data of a few components.
      5. Compare the residual station gain error (variations with time) caused by temperature variations with the station gain errors (variations with time) induced by the beam moving through the EEPs or by ignoring EEP differences.
      6. Contribute to the evolution and description of test/use-cases used to address SKA1-LOW design questions (see https://confluence.skatelescope.org/display/TDT/Questions+to+address+using+signal+chain+model)
      7. (Stretch) If/when suitable AAVS data is available, perform an initial quantitive comparison between this data and the model predictions.

      References:

       

       

       

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          Spike - A time limited investigation to get some knowledge SP-1588 Review use of HARP (and associated tools) for e2e SKA1-LOW simulation

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          Enabler - An Enabler supports the activities needed to extend the Architectural Runway to provide future business functionality. These include exploration, architecture, infrastructure, and compliance. SP-1440 Further elaboration of LOW station model simulations

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                b.mort Mort, Ben
                b.mort Mort, Ben
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                  Feature Estimate: 1.0

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