Polarization Calibration

Linear to Circular Conversion

At EOVSA’s linear feeds, in the electric field the linear polarization, X and Y, relates to RCP and LCP (R and L) as:

[math]\displaystyle{ R = X + iY }[/math]

[math]\displaystyle{ L = X - iY }[/math]

In terms of autocorrelation powers, we have the 4 polarization products XX*, YY*, XY* and YX*, where the * denotes complex conjugation. The quantities RR* and LL* are then

[math]\displaystyle{ RR* = (X + iY)(X + iY)* = XX* - iXY* + iYX* +YY* }[/math]

Polarization Mixing Correction

Due to relative feed rotation between az-al mounted antennas and equatorial mounted antennas