Precision of interference polarization estimation is a major factor influencing radar polarization anti-jamming capability. To a certain extent, the spatial polarization characteristic (SPC) of radar is ill-conditioned, resulting in unstable solution to the estimation of received wave polarization. A least squares method with a quadratic constraint is presented to estimate polarization of the received wave. It treats the ill-conditioning problem in estimating the polarization state based on least square methods. Factors affecting stability of polarization estimation are analyzed, with computer simulation results in ill-conditioned cases for particular antenna forms. Theoretical analysis is then made and algorithmic steps given according to the principle of the proposed method. The simulation shows that the method can significantly reduce variance of polarization estimation so as to improve the estimation accuracy, useful in improving radar polarization anti-jamming capability.
LIU Wen-zhao, DAI Huan-yao, HUANG Zhen-yu, CUI Jian-ling
. Polarization Estimation of Received Interference Signal Based on Spatial Modulation Effect[J]. Journal of Applied Sciences, 2015
, 33(5)
: 518
-526
.
DOI: 10.3969/j.issn.0255-8297.2015.05.006
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