Abstract
Offboard active jamming is an important means for warships against monopulse radar. By amplifying and forwarding radar signal, offboard active jammer forms centroid jamming with the actual warship echo. This paper proposes a new method based on monopulse three-dimensional(3-D) imaging against this kind of jamming. Firstly, the monopulse radar performs Inverse synthetic-aperture radar(ISAR) imaging and motion compensation processing on the three-channel signals to obtain the high-resolution distribution in range and Doppler. Then monopulse angle measurement is performed on each high-resolution cell of imaging. According to the range, azimuth and elevation information of each resolution cell, three views of the warship with jamming can be reconstructed. Finally, according to the three views, the singular points outside of the warship caused by jamming can be eliminated by setting appropriate threshold. The simulation results verify the effectiveness of the monopulse 3-D imaging in offboard active jamming mitigation. The technology has important significance for monopulse radar against angle deception of mainlobe interference.
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