Multiple interferences suppression with space-polarization null-decoupling for polarimetrie array

Abstract

The adaptive digital beamforming technique in the space-polarization domain suppresses the interference with forming the coupling nulls of space and polarization domain. When there is the interference in mainlobe, it will cause serious mainlobe distortion, that the target detection suffers from. To overcome this problem and make radar cope with the complex multiple interferences scenarios, we propose a multiple mainlobe and/or sidelobe interferences suppression method for dual polarization array radar. Specifically, the proposed method consists of a signal preprocessing based on the proposed angle estimation with degree of polarization (DoP), and a filtering criterion based on the proposed linear constraint. The signal preprocessing provides the accurate estimated parameters of the interference, which contributes to the criterion for null-decoupling in the space-polarization domain of mainlobe. The proposed method can reduce the mainlobe distortion in the space-polarization domain while suppressing the multiple mainlobe and/or sidelobe interferences. The effectiveness of the proposed method is verified by simulations.

Side Null Analysis of the Main-Auxiliary Antenna Array for Noncooperative Interference Cancellation

“…Te feature of radiation pattern Te methods adopted [31] Array pattern synthesis Main lobe and side lobe Maximize main lobe using convex optimization with side-lobe constraints [32] Interference suppression Te null at interference direction Propose a dual ring antenna to form null at interference direction [27] Interference suppression Te null at interference direction Use adaptive bat algorithm (BA) to impose nulls at directions of interferences [33] Multiple interferences suppression Te null at interference direction in main-lobe and/or side-lobe Form the coupling nulls of space and polarization domain [28] Rapidly moving interference suppression Te null at interference direction Broaden the null at interference direction…”

Robust Mainlobe Interference Suppression Based on Joint Oblique Projection for Dual Polarization Conformal Array

“…But only one main lobe interference can be suppressed. Literature [10] used the particle swarm optimization (PSO) algorithm to estimate polarization parameters for polarization fltering to suppress multiple interferences. However, this method has unsatisfactory estimation errors and expensive computational costs.…”