Polarisation oblique projection for radar seeker tracking in chaff centroid jamming environment without prior knowledge

Abstract

Chaff centroid jamming makes the indicated angle of a target by a radar seeker bias off the target, which is catastrophic to the radar seeker target tracking. In this study, the authors propose to suppress the chaff centroid jamming by polarisation oblique projection without prior knowledge of the target and the jamming polarisation parameters. At first, they prove that interference-to-signal ratio and in-phase monopulse ratio error after polarisation oblique projection are both independent of the estimation errors of the target polarisation parameters by theoretical derivation and geometrical interpretation. Then they estimate the polarisation parameters of chaff centroid jamming directly by the radar seeker received signal, and construct the polarisation oblique projection operator using the estimated jamming polarisation parameters and randomly set target polarisation parameters. They suppress the chaff centroid jamming with the estimated polarisation oblique projection operator, and demonstrate the validity of the proposed method by Monte Carlo simulations.

Adaptive Countering Technique for Angle Deception Based on Dual Polarization Radar Seeker

“…In [13][14][15][16], oblique projection technology was introduced into the polarization domain. It employed disjoint polarization subspaces to construct polarization oblique projection operator, which could remain undistorted target signal and absolutely suppress jamming signal, whereas the polarization oblique projection operator based on dual polarization radar is very sensitive for estimation error of the polarization characteristic.…”

The Correlation Characteristics of Polarization Backscattering Matrix of Dense Chaff Clouds

“…Polarization characteristics play an important role in the jamming recognition and suppression in radar electronic warfare [15][16][17][18]. The scattering characteristics of the dense chaff clouds are not always the same as that of the sparse chaff clouds.…”

Jamming recognition method based on the polarisation scattering characteristics of chaff clouds

“…Many methods have been proposed to make such a distinction. These mainly include the Doppler behaviour of the chaff [26, 27], time‐domain correlation [28, 29], time‐frequency analysis of the radar echo [30], and polarisation discrimination [31–36], which seems to be the most promising methods [10]. Chaff jamming recognition based on the Doppler behaviour of the chaff is a simple but effective method, which can be divided roughly into two categories: Doppler filtering [26] and anti‐chaff jamming method based on the effect of spectral expansion [27].…”

“…the millimetre wave synthetic aperture radar (MMV‐SAR) seeker of European Aeronautic Defense and Space Company (EADS) [38], and the ground‐based radar for the national missile defense system (NMD‐GBR) in the USA [39] etc.]. As a result, applying the polarisation characteristics of chaff to jamming recognition has attracted the interest of researchers [31–36]. Since the warship is mainly dominated by dihedral scattering, it is reasonable to assume that the co‐polarised component of echoes of the warship is much stronger than the cross‐polarised component (∼12 dB) [25].…”

“…This method seems to be innovative; however, the hypothesis of distribution of the chaff in [35] is too simple and idealistic. Yang et al [36] have proposed to suppress the chaff centroid jamming by polarisation oblique projection without prior knowledge of the target. Deficiently, this method requires real‐time estimation of jamming polarisation parameters.…”