Bias Correction to Antenna Frequency Response for Wideband Polarimetric Phased Array Radar

Abstract

The frequency response of wideband polarimetric phased array radar antenna biases polarization measurement. A bias correction method named the iterative frequency division (IFD) algorithm is proposed in this paper to eliminate the effect of frequency response of the antenna system. The method is built on a new measurement bias model in which the effects of frequency response on the backscattering covariance matrix are analyzed. To demonstrate the effectiveness of the proposed method, a wideband microstrip patch array element is designed. Simulation results show that the biases of differential reflectivity ( Z D R ) and linear depolarization ratio ( L D R ) can be decreased to less than 0.1 dB and − 40 dB even for wide beam direction. The proposed method maintains a favorable polarization measurement accuracy for wideband polarimetric phased array radar.

A Low Cross-Polarization Configuration Method for Phased Array Radar Antenna

“…where r is the distance from the antenna, k the wavenumber (k = 2π/λ), λ the radar wavelength, and ε the permittivity for an assumed uniform precipitation-free atmosphere. Based on formula (10) and formula (11), the radiated electric fields of ports 1 and 2 are…”

“…Nonetheless, most of the bias correction methods focus on the narrow-band issue. An iterative frequency division method is proposed for the wideband PPAR in [11], which expands the projection matrix correction method in [1]. Moreover, the correction matrix based on the theoretical pattern is not necessarily feasible due to the distortion of the radiation pattern, which results from mutual coupling and the edge diffraction between antenna elements.…”

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

“…So far, most of the bias corrections focus on the narrow-band case. An method, which is the expansion of projection matrix correction method in [3], is presented for the wideband PPAR [15]. In addition, because of the inevitable distortion of radiation pattern mainly resulting from the mutual coupling [16], the correction matrix using the theoretical pattern is not completely effective.…”