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.
Highlights
Polarimetric phased array radar (PPAR) has attracted broad interest, owing to its potential in weather observation, air traffic control, and air surveillance [1,2,3,4,5,6,7]
The numerical results and comparisons present the correction to the polarization measurement bias
This paper presents a key consideration for the measured polarization scattering matrix (PSM) bias that arises from the frequency response of the antenna system with wide bandwidth
Summary
Polarimetric phased array radar (PPAR) has attracted broad interest, owing to its potential in weather observation, air traffic control, and air surveillance [1,2,3,4,5,6,7]. The electric fields radiated from the horizontal (H) and vertical (V) ports are not orthogonal to each other caused by beam steering off the principal plane [3]. This leads to a cross-polar component where the polarization bias is generated. If the transmitted/received signal is wideband from a wideband polarimetric phased array radar (WPPAR), the pulse will be distorted due to the bandwidth effect of the antenna system [15]. The bias correction methods aforementioned cannot cover the wide bandwidth and inevitably cause the polarization measurement bias. The wideband effect needs to be considered for accurate polarimetric measurement applications
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call