By Donald Peattie, Paul Landacre, Robert Finch

One of 2 real classics of yankee nature writing now in paperback; the opposite is A typical background of Western Trees.

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3. 44 Foliage Penetration SAR Collection Systems The FOPEN SAR’s low frequency of operation, together with its fine azimuth resolution (wide azimuth beamwidth), required the creation of long synthetic apertures lengths or, equivalently, large integration angles. 1. This variation makes selection of the proper image formation algorithm critical. Whileit is straightforward to compensate range curvature for a given range bin, it is difficult to compensate range curvature for all range bins simultaneously.

The image covers a biological field station in Michigan with an array of trees and other cultural objects. The figure includes some ground truth photographs of the instrumentation and the vehicles used for image characterization. 2 FOPEN SAR Systems 45 FIGURE 2--17 P-3 ultra wideband SAR image characterization © 1996 IEEE [20] with far range to the right in this image). These sidelobes are due to notching out of strong RFI sources, and, although quite persistent, are still over 30 dB down. The low noise equivalent clutter return is also evident in the open areas [22].

The attenuation on the targets in foliage is significantly less in VHF than UHF, as is the clutter return. However, the targets in the low UHF band image exhibit strong scattering characteristics that were considered as discrimination for target characterization. These two points will be presented in Chapter 3 in more quantitative detail. CARABAS II also participated in the 1997 Keystone collection in Pennsylvania and demonstrated the improvements in performance of the intervening 4 years. The major difference between the two was the change in the antenna to rigid booms and refinement in signal processing.

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A Natural History of Trees: of Eastern and Central North America by Donald Peattie, Paul Landacre, Robert Finch


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