In the course of developmental testing, the need arises to provide a real-time verification of signals presented to a system under test (SUT). To test modern communications intelligence systems, the test officer must present a dense radio frequency environment containing a wide variety of signals. In order to present a realistic environment, the emitters must be geographically spread out relative to the SUT. To present this environment, the U.S. Army Electronic Proving Ground (EPG) developed a series of emitter vans, each of which presents a time order event list of radio emissions. The timing of radio emissions is accurately triggered using a Global Positioning System-based clock, and to enhance the test officer's confidence that the correct emissions are indeed occurring at the intended times, the EPG developed the Ground Truth Monitor (GTM). The GTM performs sampling of the radio frequency (RF) environment in the vicinity of the SUT to verify that each of the intended RF emissions is reaching the SUT at the intended RF power level and time. The GTM was installed and has successfully supported recent major test objectives at the Red Tower location at EPG's Antenna Test Facility.
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