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Mainlobe Jamming Cancellation With Spatial Diversity Multiple-Input–Multiple-Output Radar Through Cross Noise Subspace Projection
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DOI：10.1109/taes.2026.3713107.png)
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Abstract
En 中文
Mainlobe jamming severely threatens radar’s operation and becomes a significant bottleneck to overcome. Existing jamming suppression methods could not achieve a robust effect as diverse jamming signals often mismatch the expected model prior and cannot effectively address composite jamming signals widely employed in actual combat. Spatial-domain cancellation avoids the above issues; however, the core challenge lies in preserving the target echoes through a specific system design. In this article, we propose that mainlobe jamming cancellation (MJC) while preserving target echoes can be readily achieved with the spatial diversity multiple-input–multiple-output (SD-MIMO) radar system, where both the transmitting and receiving radars employ spatial diversity. We identify the key mechanism as follows: The radar cross section (RCS) fluctuations induced by spatial diversity will rotate the steering vector (SV) of target echoes, causing them to deviate from the SVs of self-protection jamming. After separating the received signals across multiple input channels, the jamming SVs are aligned in each channel, whereas the target echo SVs remain deviated. Subsequently, by projecting the received signals onto either an exchanged or a merged noise subspace, multiple mainlobe jamming signals are canceled while the targets’ echoes are preserved. In total, we propose two noise-subspace-projection (NSP) methods, namely exchange-NSP and merge-NSP, with an in-depth investigation into their inherent properties. In addition, we analyze the baseline requirements for countering composite jamming. The proposed algorithm benefits from its agnosticism to jamming modulation types and eliminates the need for stringent error calibration requirements among distributed radars. The experiment simulates a scenario where escort-support jammers emit multiple mainlobe suppression and deceptive jamming signals, verifying the feasibility of SD-MIMO in canceling multiple mainlobe jammings.
Keywords:
Distributed radar
escort-support jamming (ESJ)
mainlobe jamming cancellation (MJC)
mulitple-input–multiple-ouput (MIMO)
noise subspace projection (NSP)
spatial diversity
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