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]

[math]\displaystyle{ LL^* = (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