Ultrawide-bandwidth polarimetric SAR imagery of foliage-obscured objects

Dan R. Sheen; Susan C. Wei; Terry B. Lewis; Stuart R. DeGraaf

doi:10.1117/12.145519

28 May 1993 Ultrawide-bandwidth polarimetric SAR imagery of foliage-obscured objects

Dan R. Sheen, Susan C. Wei, Terry B. Lewis, Stuart R. DeGraaf

Proceedings Volume 1875, Ultrahigh Resolution Radar; (1993) https://doi.org/10.1117/12.145519
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, 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 carriage, 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. Because the system is ground-based and images are in the near field, a traditional spotlight SAR processor is inadequate. ERIM has implemented a near-field SAR processor which transforms the data to the far-field by performing a Fourier transform in the azimuth direction. This is often referred to as a planewave decomposition and results in data sampled as if it were collected in the far-field. The final step is a traditional spotlight processor (resampling and two-dimensional Fourier transform) which is applied to the data to form the image.

Citation Download Citation

Dan R. Sheen, Susan C. Wei, Terry B. Lewis, and Stuart R. DeGraaf "Ultrawide-bandwidth polarimetric SAR imagery of foliage-obscured objects", Proc. SPIE 1875, Ultrahigh Resolution Radar, (28 May 1993); https://doi.org/10.1117/12.145519

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