Calculation of depolarization cancellation on Ka-band satellite-to-ground path

The distribution of cross-polarized phase relative to copolarized phase, which is important in the design of depolarization cancelers, is presented using the CS-2 beacon signal (19.45 GHz, right-hand circular. EL=49.5 degrees ), and its dependence upon rainfall rates is discussed. Also, additional depolarizations due to ice effects are estimated and a calculation is made to show the possibility of cancelling them on the complex depolarization plane. The analysis of the cross-polar phase characteristics of Ka-band depolarization indicates a possibility of its compensation by phase shifters within small rainfall rates, which do not exceed a general rain margin (<5-10 dB). Consideration of the differential phase shift cancellation mechanism on the complex depolarization plane suggests that the improvement for the ice effects is approximately estimated by the additional ice depolarization observed in the cross-polar discrimination (XPD) amplitude.<
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