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:

$R=X+iY$

$L=X-iY$

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

$RR*=(X+iY)(X+iY)*=XX*-iXY*+iYX*+YY*$

Polarization Mixing Correction

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