Polarization properties

Dear All,

Let us assume that we have a monostatic radar scheme when a Tx and Rx are collocated. A signal, transmitting by the Tx scatters on an electrically large object (human body) and returns to the RX. My question is what would be the best way to evaluate the cross-pol ratio (XPR[dB] = Total copol. signal[dBm] - total xpol. signal[dBm]) on the RX?

Thank you!

BR, Dimon