SA-6 GAINFUL / 3M9 SAM missile's 1SB4 SARH Seeker on Youtube

Can anyone explain how the sa-6 gainful seeker works.why is there a polarisation screen.
 
Can anyone explain how the sa-6 gainful seeker works.why is there a polarisation screen.


I would like to offer a theory in this respect.

The appearance of the polarization screen can means that the Illumination radar for the SA-6 might works on the circular polarization, while the missile seeker works in perhaps Horizontal polarization. The screen will later convert the reflected circularly polarized return from target into horizontal.

As for why circular, it could be perhaps to allow maximization of signal strength of the radar in "all weather" condition as circularly polarized wave able to penetrate rain with less loss. While horizontally polarized return signal will AFAIK maximize the apparent target RCS. Without the polarization screen, the reflected circularly polarized signal will induce about 3dB of polarization loss, which perhaps the Designer wish to avoid.
 
I have read that this seeker is monopulse,yet there is no visible four horn feed or antenna?
 

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