Memos

Memos from our team that are useful and should be preserved.

List of memos

1. Interpreting Discrete Fourier Transforms - Notes on how to translate between continuous and discrete Fourier transforms, and how to get the units right.
2. Cosmological Units - Notes on how to convert from the Fourier duals of sky position and frequency to cosmological units. This memo summarizes Hogg 2000 and Morales and Hewitt 2004.
3. Polarized Cal Cross Phase - Documentation of cross phase parameter calculation in FHD. The cross phase parameter is calculated in calibration and defines the overall phase offset between the x- and y-dipoles, corresponding to mixing between Stokes U and V.
4. Beam Resolution Test - Test on comparing using per frequency beam, which is robust but computationally expensive, and using per half coarse band beam, which is computationally efficient but less reliable, in FHD-eppsilon pipeline.
5. Eppsilon Error Propagation - Propagating error through gridding, to power spectrum (including even/odd sum and differencing), and treatment of PDFs after averaging data.
6. Image to PS Notes - Some notes on calculating a power spectrum from an image cube. Includes getting units right, a detailed analytic window function calculation, how to calculate the window integral from FHD cubes, and a couple thoughts on the effect of w-projection.
7. Van Vleck A - Description of MWA quantization and implementation of a Van Vleck correction using pyuvdata.
8. Van Vleck B - Initial results of Van Vleck correction applied to two MWA time samples.