Document the fact that we are using the E field in uvbeam in a nontstandard way

dannyjacobs / ECHO

Software, libraries and data for the External Calibrator for Hydrogen Observatories

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Document the fact that we are using the E field in uvbeam in a nontstandard way #23

Open dannyjacobs opened 4 years ago

dannyjacobs commented 4 years ago

We are measuring the polarization of the beam using ENU locked coordinates. For v1.0 we are using pyuvbeam's electric field az_za which projects the E field onto theta, phi coordinate. We will be using Etheta to store E_North and Ephi is E_West. This is a dirty hack.

TODO:

[ ] Actually do this in the current version
[x] Document the fact
[ ] Propose a PR to pyuvbeam to handle ENU geometry natively (not in V1.0)

dannyjacobs commented 3 years ago

We don't actually use pyuvbeam to write ECHO beams yet. Just use it for reading in CST beams. We compare in power, so no coordinate issues in the short term.