  Several post-detection approaches to the mitigation of radio-frequency
interference (RFI) are compared by applying them to the strong RFI from the
Iridium satellites. These provide estimates for the desired signal in the
presence of RFI, by exploiting distinguishing characteristics of the RFI, such
as its polarization, statistics, and periodicity. Our data are dynamic spectra
with full Stokes parameters and 1 ms time resolution. Moreover, since most
man-made RFI is strongly polarized, we use the data to compare its unpolarized
component with its Stokes I. This approach on its own reduces the RFI intensity
by many tens of dBs. A comprehensive approach that also recognizes non-Gaussian
statistics, and the time and frequency structure inherent in the RFI permits
exceedingly effective post-detection excision provided full Stokes intensity
data are available.
