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For millimeter wave (MMW) radar system of dual polarization, this paper presents a polarization identification method of active jamming decoys. Firstly, the principle of dual polarization technique is introduced, and the characteristics of dual polarization echo of the representative radar targets and various active decoys are analyzed in detail. Secondly, some effective characteristics of active decoys and radar targets are obtained to express their polarization characteristics differences, such as polarization ratio and polarization undulation. Thirdly, an identification method based on self - adaptive constant false alarm rate (CFAR) threshold is proposed. Finally, a dual polarization test radar system is constructed to gather and analyze the experimentation echo data of buildings, vertical polarization, horizontal polarization and left-handed circular polarization active decoys, and the experimentation results prove that the dual polarization identification method of active decoys is feasible and effective. [ABSTRACT FROM AUTHOR]

The development of a Ka-band monopulse variable polarization antenna is presented, based on polarization synthesis theory. This kind of microstrip array antenna consists of several linearly polarized subarrays of rotational symmetry, and change the polarization mode by adjusting the phase of each subarray. The circular polarization of three subarrays and four subarrays has high polarization purity with over 30 dB cross-polarization and less than 3 dB axial ratio within the half power beamwidth; and the imbalance of two peaks in difference beam is less than 1 dB, and null depth is over 30 dB. [ABSTRACT FROM AUTHOR]