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  1. SAFe Program
  2. SP-2376

Testing, validation, and further development of LOW simulations using HARP-based Embedded Element Patterns

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    • Enabler
    • Could have
    • PI14
    • COM SDP SW
    • None
    • Data Processing
    • Hide

      see description

      Show
      see description
    • Hide
      • Timeboxed activity to provide a demo and/or report (~10min demo preferred) showing the results of analysis of the current solution (code) compared to results from existing telescopes.

      TBD: Once this is planned can we list a few planned tests/comparisions here to add a bit more detail?

      Show
      Timeboxed activity to provide a demo and/or report (~10min demo preferred) showing the results of analysis of the current solution (code) compared to results from existing telescopes. TBD: Once this is planned can we list a few planned tests/comparisions here to add a bit more detail?
    • 3
    • 3
    • 2
    • 0.667
    • Team_HIPPO
    • Sprint 5
    • Hide

      A summary of the results is on the confluence page: https://confluence.skatelescope.org/display/SE/SP+2376%3A+Testing%2C+validation%2C+and+further+development+of+LOW+simulations+using+HARP-based+Embedded+Element+Patterns. A new function was added in the harp beam library to compute all the embedded element patterns within a station. The MATLAB script and the GPU code were compared and they agree to a high degree. A double-precision agreement was also achieved between the visibilities computed with OSKAR and with a MATLAB script. HDF5 files with HARP data (impedance matrix and EEPs coeffs) from 50 to 350 MHz every 1MHz were produced. Plots of mutual coupling between antennae is shown on the confluence page. Two tests were run. The GLEAM all-sky catalogue with HARP coefficients for a single station and a single frequency was performed. Furthermore, a simulation of a single station over the whole bandwidth (from 50 to 350 MHz) was run.

      Show
      A summary of the results is on the confluence page: https://confluence.skatelescope.org/display/SE/SP+2376%3A+Testing%2C+validation%2C+and+further+development+of+LOW+simulations+using+HARP-based+Embedded+Element+Patterns . A new function was added in the harp beam library to compute all the embedded element patterns within a station. The MATLAB script and the GPU code were compared and they agree to a high degree. A double-precision agreement was also achieved between the visibilities computed with OSKAR and with a MATLAB script. HDF5 files with HARP data (impedance matrix and EEPs coeffs) from 50 to 350 MHz every 1MHz were produced. Plots of mutual coupling between antennae is shown on the confluence page. Two tests were run. The GLEAM all-sky catalogue with HARP coefficients for a single station and a single frequency was performed. Furthermore, a simulation of a single station over the whole bandwidth (from 50 to 350 MHz) was run.
    • 17.5
    • Accepted by FO

    • PI22 - UNCOVERED

    Description

      Who?

      SDP pipeline developers, SKA System scientists, SKA Science team

      What?

      For Simulations of SKA1 LOW including a sophisticated model of antenna element beams, where possible matched to actual measurements or costly EM simulations in other packages.

      In PI14 to be considered:

      • Modification of the library to compute the EEP very quickly
      • Familiarisation of the interface with OSKAR
      • Generation and sharing of post-processing scripts (power spectra etc)
      • Demonstration of the effectiveness of the current code/approach in end-to-end simulations/tests.
      • Starting with a single station with SKALA4 going from 50 to 250 MHz in steps of 1 MHz looking at the response to coupling effects between antennas looking to reproduce results from existing telescopes.
      • A release of OSKAR that can be used by the SKAO science team

      Why?

      Simulations of SKA1 LOW data is important for driving the development of SDP pipelines and for the analysis of SKA1 data for a number of science use cases (eg EoR) that are very sensitive to the spatial and frequency behaviour of the LOW station beam. 

      Improving our tooling for this will enable more sophisticated tests to be carried out before SKA data is available and, in the longer term, analysis of SKA data products against simulations which is anticipated to greatly help improve understanding of how to optimise the use of the telescope. 

      Other notes

      https://confluence.skatelescope.org/display/SE/SP-2169%3A+Integrating+HARP%27s+efficient+beam+evaluation+method+with+OSKAR 

       

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          depends on

          Feature - A Feature is a service that fulfills a stakeholder need. Each feature includes a benefit hypothesis and acceptance criteria, and is sized or split as necessary to be delivered by a single Agile Release Train (ART) in a Program Increment (PI). SP-2169 Integration of HARP’s efficient beam evaluation method into OSKAR

          • Should have - Items labelled as "Should have" are important but not necessary for delivery in the current delivery timebox. While "Should have" items can be as important as "Must have", they are often not as time-critical or there may be another way to satisfy the requirement so that it can be held back until a future delivery timebox.
          • Done
          relates to

          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-2564 Continuation of HARP-based element pattern work

          • Could have - Items labelled as "Could have" are desirable but not necessary and could improve the user experience or customer satisfaction for a little development cost. These will typically be included if time and resources permit.
          • Done
          mentioned in

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                b.nikolic Nikolic, Bojan
                b.mort Mort, Ben
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