An Adaptive Direction-Dependent Polarization State Configuration Method
for High Isolation in Polarimetric Phased Array Radar
Abstract
High cross-polarization isolation (CPI) is crucial to the accurate
polarization measurement using polarimetric phased array radar (PPAR).
In this paper, we propose an adaptive direction-dependent polarization
state configuration (AD2PSC) method to improve the polarization
isolation. Compared with conventional fixed polarization state of
radiated wave whether it is linear, circular or elliptical polarization
state, our AD2PSC approach configures the polarization state on basis of
beam steering. To achieve the adaptive configuration of magnitude and
phase of the dual-polarization antenna, an improved steepest descent
algorithm is put forward. To facilitate the uniform representation for
the polarization measurement application of PPAR, the universal
expressions of intrinsic and measured backscatter matrices are derived
for arbitrary polarization state. The dualpolarization dipole array is
used to assess the priority of our proposed method. Compared with the
conventional approaches,
our approach could obtain higher CPI while being available for a larger
scanning range. The configured CPI meets the specific polarization
requirement for PPAR.