Abstract: To better characterize the background clutter seen by infrared warning receivers (IRWR), a methodology was developed which divided the background environment into six categories: (1) rural, (2) urban below 6,000 feet above- ground-level (AGL), (3) urban above 6,000 feet AGL, (4) industrial, (5) battlefield, and (6) extended fire. Each of these environments has unique characteristics which separate it from the other environments and these characteristics can be used by the system designer to improve the system false alarm rate. A flight test was conducted in these environments to collect IRWR response data and attempt to identify IR sources which may cause false alarms. This paper describes the different environments, techniques developed to identify false alarm sources and lessons learned from the flight test.!1
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