workshop's Introduction
workshop's People
workshop's Issues
SARG: STOCHASTIC MODELLING OF WEATHER DATA
MARKOV CHAIN MODEL
- ANNUAL RAINFALL
** summarize data into categories (say, low, medium, high) for each station
** generate Transition Probability Matrix (TPM) using Maximum Likelihood Estimator (MLE) for each.
- MONTHLY RAINFALL
** summarize data into WET & DRY
*** Schwarz criterion to choose the best optimum order
*** Use Chapman-Kolmogorov equation to determine the ergodic distribution matrix of the system.
Weather Sites
Notes
** Testing Kerasregressor
https://nbviewer.jupyter.org/urls/dl.dropbox.com/s/3imkmd9gtrfg7xv/martin_results.ipynb
Journals
https://www.semanticscholar.org/author/T.-Ansah-Narh/3515997
- Astrophysics and Space Science
http://www.springer.com/astronomy/astrophysics+and+astroparticles/journal/10509
-- http://www.e-publications.org/springer/support/astr.html
- New Astronomy
https://www.journals.elsevier.com/new-astronomy/
- Astronomy and Computing
https://www.journals.elsevier.com/astronomy-and-computing/
- Computational Astrophysics and Cosmology
https://comp-astrophys-cosmol.springeropen.com/about
- Journal of Astronomical Telescopes, Instruments, and Systems
https://www.spiedigitallibrary.org/journals/journal-of-astronomical-telescopes-instruments-and-systems/author-guidelines
OR
https://www.overleaf.com/15312580qcvwhbxgtxvp#/57976857/
JOURNAL OF ASTRONOMICAL TELESCOPES, INSTRUMENTS, AND SYSTEMS
https://www.spiedigitallibrary.org/journals/Journal-of-Astronomical-Telescopes-Instruments-and-Systems/volume-5/issue-3
https://www.spiedigitallibrary.org/https://www.elsevier.com/journals/new-astronomy/1384-1076/guide-for-authors
International Journal of Data Science and Analytics
https://www.springer.com/journal/41060
Journal of Engineering, Design and Technology
https://www.emeraldgrouppublishing.com/products/journals/journals.htm?id=JEDT
South African Journal of Science
https://www.sajs.co.za/issue/view/584
Birth Prediction
SARG: Primary beam effects of radio antenna: Effects of Kutunse beam on CO Intensity Mapping
- Use true modelled beams to simulate the foreground
- Use distorted beams to simulate the foreground also.
- Produce residual plots
- A mathematical model of CO
- Estimate the power spectrum wrt moments to determine the polarisation leakage
transforming a Healpix all-sky map to a flat one
The following script converts a spherical map into a flat sky::
http://nbviewer.jupyter.org/urls/dl.dropbox.com/s/b00y8jmsbbx498o/spherical_2_flat_sky.ipynb
SARG: Modelling Kutunse Primary Beams from Simulations III
Using Cassbeam::
- _Produce IXR, FWHM vrs frequences, CO & Cross polarised plots _
- Reconstruct beams Using Zernike, SVD, SH
- Introduce phase error
NB: conclude that future work will be done using holography
SARG: Modelling Kutunse Primary Beams from Simulations I
Sim 1: Using OSKAR
- Geometrical model of Kutunse dish
- Consider the dish as a collection of dipoles;
- Assume the radial distribution of the dipoles to be a Super-Gaussian; (Note: This will mimic an aperture illumination of the dish)
- Introduce errors in the dipole orientations to distort the main reflector
- Introduce phase error to also distort the beam (this will introduce feed displacement)
- remove the supporting structures (i.e. the struts and secondary reflector)
- vary the size of the secondary reflector
- Produce Complex beams
- Refer to Jones matrix
- Produce Complete beams
- Refer to Mueller matrix
-
Measure the Intrinsic Polarisation Leakage (IXR)
-
Estimate the FWHM across all frequencies (5 - 6.7 GHz)
-
Reconstruct the simulated beam models
- Apply Zernike Moments Using the strongest Coefficients
- Apply SVD using fewer eigenvalues for reconstruction.
SARG: Modelling Kutunse Primary Beams from Simulations II
sim 2: Using GRASP
- Geometrical model of the instrument
- compare different spherical cuts
- Distort the beam by using feed displacement
- change the size of the reflector to distort the beam
- _Produce IXR, FWHM vrs frequences, CO & Cross polarised plots _
- Reconstruct beams Using Zernike, SVD, SH
NB: conclude that future work will be done using holography
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