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

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Figure 6-108: COP display showing fused tracks from the WIAR1 <strong>and</strong> eBirdRad radars at NAS<br />

Whidbey Isl<strong>and</strong> on 13 November 2009 at 01:55 UTC. Red tracks = WIAR1 radar; green tracks<br />

= eBirdRad radar.<br />

In this example we have circled the two separate targets of interest, which are offshore to the<br />

northwest. These fused tracks are characteristic of two distinct flocks of birds traveling in the<br />

same direction (approximately southwest), a small distance from each other.<br />

The fused tracks shown in Figure 6-108 were formed from track information from the two<br />

contributing radars: the WIAR1 tracks are displayed in red <strong>and</strong> the eBirdRad tracks are displayed<br />

in green. The WIAR1 is a 25 kW, X-b<strong>and</strong> radar with a 6-foot array antenna (short pulse); the<br />

eBirdrad is a 50 kW X-b<strong>and</strong> radar with a 4° dish antenna (short pulse). For the purposes of this<br />

demonstration, the antenna angle of the eBirdrad radar was pointed to 5° above the horizontal so<br />

its beam would overlap with the beam from the array antenna of the WIAR1 radar. The array<br />

antenna covers elevation angles from 0°-10°, while the dish covers 3°-<br />

7°. The radars are located within 100 m of one other.<br />

The targets shown in Figure 6-108 first appeared on the radars at 01:54:33 UTC, <strong>and</strong> had ended<br />

by 01:56:31 UTC – an interval of 118 seconds. The RFE took only 2 seconds to process this<br />

241

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