station_beam

SKA-Low station beam models, sensitivity etc

Web Interface is currently deployed at these locations :

• https://sensitivity.skalow.link/ or https://sensitivity.skalow.link/backup

Deployment procedure for the python package :

• requirements : python3 from anaconda package (https://www.anaconda.com/products/individual-d) usually includes all the requirement packages (astropy, h5py, numpy etc), but when using other python distributions (including standard package included in Linux distributions) the following steps may be required:

  • pip install astropy
  • pip install h5py
  • pip install numpy

• mkdir ~/github/

• cd ~/github/

• git clone https://github.com/marcinsokolowski/station_beam.git

• Execute ~/github/station_beam/install/deploy_beam_models.sh this scripts assumes that the package is installed in ~/github/station_beam/ , parameters are :

  • first parameter is final location where BeamModel files are copied, default ~/aavs-calibration/BeamModels/
  • parameters 2, 3, 4 are URLs to EDA.tar.gz, SKALA2.tar.gz, SKALA4.tar.gz currently on my Dropbox

  It can also be done manually : download beam models of individual dipoles from https://www.dropbox.com/sh/imb2002vwhmoyxo/AAB36xD5UYGE5PblAiEkWYLma?dl=0 to BeamModels directory, unpack the files:

  • tar zxvf EDA.tar.gz
  • tar zxvf SKALA2.tar.gz
  • tar zxvf SKALA4.tar.gz
  • move BeamModels to final location, for example : mv BeamModels ~/aavs-calibration/
  • modify file ~/github/station_beam/station_beam_config.py so that parameter beam_model_path is set to full path to BeamModels/"

• deployment of databases use script install/deploy_databases.sh which takes 3 parameters:

  • parameter 1 is the location of database file on the target system (default ~/github/station_beam/sql/)
  • parameter 2 is the URL to the EDA2 SQLite database (currently on my Dropbox)
  • parameter 3 is the URL to the AAVS2 SQLite database (currently on my Dropbox)

Example commands :

• Example commands using sensitivity databases for AAVS2 and EDA2 stations are provided in the header of sensitivity_db.py script

• Example command to generated sensitivity at a specified time (GPS time), frequency (160 MHz), for AAVS2 station at the position of Hydra-A radio-galaxy, using Average Embedded Element (AEE) pattern of SKALA4 antenna in the AAVS2 station:

  • cd python/
  • python ./eda_sensitivity.py --freq=160 -p None -g 1320891467 -m analytic --ra=333.607249950 --dec=-17.02661111 --outsens_file=HydA_aavs2_sensitivity --outfile_mode=a --trcv_type=trcv_from_skymodel_with_err --nos11 --header=HEADER --use_beam_fits --station_name=SKALA4 --size=512 --trcv_type=trcv_aavs2_vs_za_deg --antenna_locations=antenna_locations_aavs2.txt --projection=aee

Acknowledgements

If you have been using this software or the related web interface for your research. Please, cite the paper:

 Sokolowski at al., Publications of the Astronomical Society of Australia, Volume 39, article id. e015

 ( https://ui.adsabs.harvard.edu/abs/2022PASA...39...15S/abstract )