Adaptive signal processing techniques for multiband polarimetric radar

The authors present polarimetric detector, the multiband polarization generalized likelihood ratio (MPGLR) test, which provides further performance improvement by the use of the full transmit and receive polarization diversity. The generalized likelihood ratio approach is taken to acquire and adapt to the statistics of the clutter background. In order to obtain a reasonable clutter estimate, with the increased degrees of freedom, sufficient secondary data must be available. However, clutter polarization has been observed to be highly inhomogeneous in range, severely restricting the availability of independent and identically distributed (IID) data vectors necessary for adaptive estimation of the unknown clutter covariance. The use of multiband (frequency diverse) signaling increases the number of IID data vectors available for clutter covariance estimation, and they begin with a discussion of the signaling method