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(IVAR) - Final Report - Strategic Environmental Research and ...

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of the avian radar system. This altitude is also in the range of altitudes at which some migrating<br />

birds are known to fly.<br />

Methods<br />

Figure 6-57 is a digital image of the display of the eBirdRad avian radar at Edisto Isl<strong>and</strong>, South<br />

Carolina on 5 October 2008 at 00:43:37 GMT 20 . In the display, the symbols are the same as<br />

previous examples: the green circles are detections that have not been formed into tracks, while<br />

the red squares with a red line (heading of target) <strong>and</strong> white numerals (Track ID) indicate the<br />

current position of a target that is being tracked by the radar.<br />

This particular eBirdRad unit was equipped with a dish antenna that had a 2.5° beam width <strong>and</strong><br />

was set to an angle of 30° above the horizontal. At a 30° angle of inclination, the altitude of a<br />

target is half of its range. Thus, any target at a range >2 km from the radar would be at an<br />

altitude >1 km (3280 ft), <strong>and</strong> would therefore meet the performance metric for this<br />

demonstration.<br />

20<br />

4 October 2008 at 20:43:37 Eastern Daylight Time<br />

151

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