Ung, D.C.X., 2019. Determination of Noise Temperature and Beam Modelling of an Antenna Array with Example Application using MWA (Doctoral dissertation, Curtin University).
The program computes:
- Antenna noise temperature due to local sky image (Haslam 408 MHz all sky map) (K)
- Effective area of 4x4 MWA array tile (m^2)
- Radiation efficiency (%)
- Realised area (m^2)
- Receiver noise temperature (K)
- System noise temperature (K)
- System Equivalent Flux Density (SEFD) in kJy
- Sensitivity (m^2.K^-1)
Simulated frequencies:
f = [49.92,327.68] MHz with df = 1.28 MHz
Extract spherical modal coefficients from archive (MWA_FEE_rev3_meas_LNA_imp.7z) in the same folder (Data/).
Usage (input_data.py):
-
Choose polarization ('X' or 'Y');
-
Specify gridpoint number from .csv file (See Data foulder);
-
Provide ϕ- and θ- angles (spherical coordinates) of sky object that's been observed on the sky semisphere;
Conversion from Elevation and Azimuth coordinates to spherical θ and ϕ angles:
θ=arccos[cos(el)cos(az)] ϕ=arctan[tan(el)/sin(az)]Conversion from Astronomical u,v coordinates to spherical θ and ϕ angles:
θ=arcsin[sqrt(u^2+v^2)] ϕ=arctan[u/v] -
Give the date of observation and local coordinates of the observer.
Run:
OMP_THREAD_NUM=4 python3 MWA_sensitivity.py
(multithreaded)
OR
python3 MWA_sensitivity.py
Required modules:
datetime, numpy, pandas, scipy, matplotlib, h5py, scikit-rf, astropy, aenum
Installation:
Linux:
pip3 install datetime, numpy, pandas, scipy, matplotlib, h5py, scikit-rf, astropy, aenum
Windows / Linux / MacOS:
- Download Anaconda (Select Latest Version): https://www.anaconda.com/distribution/#download-section
- Open Anaconda Navigator
- Open Spyder
- In the Console Line type: pip instal aenum, scikit-rf
- Download archive (Windows) or clone this repository
- Go to /Data/ folder and extract MWA_FEE_rev3_meas_LNA_imp.h5 file
- Open MWA_Sensitivity.py in Spyder or type, for example, "cd C:\Users\Desktop\MWA-Sensitivity-master" in the Console Line
- Enter 'run MWA_sensitivity' in the Console Line to run the main script
- Alternatively, skip the above two options, and use key combination Ctrl+O, navigate to the folder where MWA_Sensitivity.py is located and press F5 to run the script