Vehicular MIMO SAR Imaging in Multipath Environments
Date
2011
Author
Advisors
Krolik, Jeffrey L
Nolte, Loren W.
Reynolds, Matthew S.
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Abstract
Current synthetic aperture radars (SAR) are most effective in simple, open terrains
where direct-path propagation can be assumed. For ground-vehicle based SAR from a
moving platform, however, strong multipath scattering off terrain features with the
same direction of arrival and delays as direct path returns, results in serious imaging
artifacts. Moreover, the dilemma between spatial coverage and azimuth resolutions
and the along track sampling constraints are limiting factors which have thus far
been precluded vehicular SAR in urban areas. In this thesis, multi-input multi-output
(MIMO) forward looking synthetic aperture radar is developed for imaging from a moving
ground vehicle in urban multipath environments. MIMO methods are utilized to improve
SAR images by suppressing directions of departure which would otherwise be multipath
scattered and added to direct path returns by applying a three dimensional non-causal
spatial filter in the direction-of-departure (DOD), direction-of-arrival (DOA), and
Doppler-frequency domains which also enables the image with wide-swath and high resolution
simultaneously. Both conventional and adaptive MIMO SAR methods are presented and
compared in a multipath imaging simulation. The results suggest MIMO SAR offers substantial
gains versus conventional SIMO imaging in presence of multipath.
Type
Master's thesisDepartment
Electrical and Computer EngineeringPermalink
https://hdl.handle.net/10161/5060Citation
Li, L (2011). Vehicular MIMO SAR Imaging in Multipath Environments. Master's thesis, Duke University. Retrieved from https://hdl.handle.net/10161/5060.Collections
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