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ratt-ru / meqtrees

A library for implementing radio astronomical Measurement Equations
http://meqtrees.net
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turbo-sim.py: noise from SEFD and sqrt(2) #869

Closed IanHeywood closed 8 years ago

IanHeywood commented 8 years ago 
    _noise_option.set_value(noise_sefd/math.sqrt(2*noise_sefd_bw_khz*1e+3*noise_sefd_integration));

Unless I'm mistaken then the 2 inside the math.sqrt is for two polarizations. Since the noise is cast later as an additive 2x2 matrix I think the resulting image noise will be a factor of sqrt(2) lower than it should be.

IanHeywood commented 8 years ago

Fixed. Put it back if Tony and I are wrong!