Artifacts in Radar Imaging of Moving Targets
Download
Author
Tng, Yan Siong
Date
2012-09Advisor
Borden, Brett H.
Second Reader
Cristi, Roberto
Metadata
Show full item recordAbstract
In this thesis, we study the artifacts that occur when a scene being imaged by radar contains moving targets. The physics of interaction between radar waves and moving targets were studied to develop a model using MATLAB for the received signal which does not make use of the start-stop approximation. The effects of target motion in the image formation process were studied for different radar configurations, including multistatic radars and Synthetic Aperture Radar. The key limitation of this model is its high computational resource requirements when simulating high bandwidth or long pulses. It was observed that range profiles may experience distortion due to the received waveforms differences from the matched filter. The exact outcome is waveform dependent; generally, both main lobe broadening and range errors were introduced by target motion. This leads to the wrong object localization and defocusing on the image. For SAR, a moving targets physical location varies throughout the imaging process. This means that standard backprojection fails to yield a focused image even if the range error due to the Doppler shift has been corrected, resulting in smearing. This is similar to motion blur experienced in optical cameras with a fast object.
Collections
Related items
Showing items related by title, author, creator and subject.
-
Magnetic force on a current carrying wire - Jumping wire physics demonstration [video]
Naval Postgraduate School Physics (2015);Magnetic Force on a current carrying wire Hi. I’m Dr. Bruce Denardo here in the Physics Department of the Naval Postgraduate School in Monterey, California. In another video, we demonstrated the fundamental magnetic force ... -
Magnetic Forces and Magnetic Fields [video]
Naval Postgraduate School Physics (2015);Magnetic Forces and Magnetic Fields Hi. I’m Dr. Bruce Denardo here in the Physics Department of the Naval Postgraduate School in Monterey, California. When a charged particle moves through a magnetic field, a force on the ... -
APPLYING CONVOLUTIONAL NEURAL NETWORKS TO IDENTIFY MOVING TARGETS IN SAR IMAGERY
Henegar, Erik L. (Monterey, CA; Naval Postgraduate School, 2021-09);Synthetic Aperture Radar (SAR) is a type of radar that can provide high resolution imagery regardless of time of day or weather conditions. Convolutional Neural Networks (CNNs) or other deep learning algorithms can be ...