VHF/UHF ultra-wideband SAR imaging of scattering targets in foliage

摘要

The radar response of foliage at selected narrow band has been studied and statistically modeled, while the wideband response behavior is not as well known. Measurements were taken of a medium-sized woodlands with a basal area of 106 ft/sup 2//acre, in a bandwidth from 200 MHz to 2000 MHz. The woodland was located in a temperature climate, and consisted of 100% deciduous vegetation. The data were taken in both summer and autumn. The autumn measurements were done with an estimated 10% of leaf coverage. Corner reflectors were placed into the target range to study absorption. Coherent focused images are generated using an adaptation of a projection slice algorithm. Since the resolution is on the same order as the effective center frequency, the polarity of the focussed image is meaningful. Waterfall plots and synthetic aperture radar images have been obtained.