Subjects: Electronics and Communication Technology >> Radar Engineering submitted time 2020-09-08
Abstract： Monopulse lobing has been applied in scanning radars to improve image quality in the forward-looking area. However, monopulse measurements fail to resolve multiple targets in the same resolution bin because of angle glint, which may lead to imaging blurring. To tackle the problem, we propose a monopulse forward-looking imaging method via Doppler estimates of sum-difference measurements. Firstly, target multiplicity is resolved by exploiting the different Doppler slopes caused by relative motion between the platform and targets at different directions. Secondly, the azimuthal angles of the Doppler estimates are accurately measured by using sum-difference amplitude comparison (SDAC). Subsequently, the intensity of the sum channel estimates is projected onto the image plane according to the range and angle measurements. To further improve the precision of angle measurements, a chirp-z transform (CZT) based algorithm is proposed to reconstruct the Doppler estimates of sum-difference channels. Simulation results demonstrate the capability of our proposed methods to resolve multiple targets at the large-squint scanning angles. Real data experiments validate that the CZT based algorithm significantly improves the profile of the scene compared to that of the traditional monopulse imaging method. "
Peer Review Status:
Awaiting Review
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