An Adaptive Direction-Dependent Polarization State Configuration Method for High Isolation in Polarimetric Phased Array Radar

• Published in: IEEE transactions on antennas and propagation 2021-06, Vol.69 (6), p.3257-3272
• Main Authors: Wang, Zhanling, Yin, Jiapeng, Pang, Chen, Li, Yongzhen, Wang, Xuesong
• Format: Article
• Language: English
• Subjects: Algorithms; Antenna measurements; Antennas; Array signal processing; Backscattering; Beam steering; Configurations; Cross-polarization isolation (CPI); Dipoles; Dual polarization radar; Elliptical polarization; Encoding; Phased arrays; polarimetric phased array radar (PPAR) antenna; Polarization; polarization state configuration (PSC); Radar antennas; Radar arrays; Radar polarimetry; Storms
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2020.3037704

High cross-polarization isolation (CPI) is crucial to the accurate polarization measurement using polarimetric phased array radar (PPAR). In this article, we propose an adaptive direction-dependent polarization state configuration ( \text {A}{{\text {D}}^{{2}}}\text {PSC} ) method to improve the polarization isolation. Compared with the conventional fixed polarization state of radiated wave whether it is linear, circular, or elliptical polarization state, our \text {A}{{\text {D}}^{{2}}}\text {PSC} 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 dual-polarization 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.