Imaging of buried and foliage-obscured objects with an ultrawide-bandwidth polarimetric SAR

Dan R. Sheen; Terry B. Lewis; Susan C. Wei; D. W. Kletzli Jr.

doi:10.1117/12.160347

15 November 1993 Imaging of buried and foliage-obscured objects with an ultrawide-bandwidth polarimetric SAR

Dan R. Sheen, Terry B. Lewis, Susan C. Wei, D. W. Kletzli Jr.

Proceedings Volume 1942, Underground and Obscured Object Imaging and Detection; (1993) https://doi.org/10.1117/12.160347
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

The Environmental Research Institute of Michigan (ERIM) has developed a unique ground- based, portable, synthetic aperture radar (SAR). This SAR images targets in their natural backgrounds without the expense of an airborne sensor and with higher performance (bandwidth, resolution) than existing airborne systems. A horizontal 36-foot long aluminum truss supports a rail and an antenna cartridge, which is moved along the rail to allow synthetic aperture focusing. The system is fully-polarimetric and has collected data over the frequency band of 400 - 1300 MHz resulting in a nominal resolution of 0.17 m in range and 0.5 m in cross-range. The low frequency range of the system allows for penetration of soil (to shallow depths) as well as foliage and the system has been used to collect images of buried and foliage- obscured targets. The ground imagery collected to date includes steel oil drums buried at depths of up to one-meter. Both the drums as well as the disturbances due to digging the holes are visible in the imagery. Foliage imagery includes portions of a Lear jet under a mature hardwood forest. Due to the low frequency and wide bandwidth of the sensor (400 - 1300 MHz), obscured objects are clearly visible in the SAR imagery. Other responses in the foliage imagery are due to the dihedral-like ground-trunk reflections.

Citation Download Citation

Dan R. Sheen, Terry B. Lewis, Susan C. Wei, and D. W. Kletzli Jr. "Imaging of buried and foliage-obscured objects with an ultrawide-bandwidth polarimetric SAR", Proc. SPIE 1942, Underground and Obscured Object Imaging and Detection, (15 November 1993); https://doi.org/10.1117/12.160347

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KEYWORDS

Synthetic aperture radar

Antennas

Image processing

Radar

Dielectric polarization

Polarimetry

Reflection

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