High Frequency Geolocation and Characterization (HFGeo)
High Frequency (HF) communications systems and radars are in widespread use around the world. Accurate stand-off geolocation and characterization of these sources is difficult because of ionospheric variations, the high noise environment that exists at these frequencies, and ionospheric polarization rotation, multipath induced signal fading, and simultaneous multiple angles-of-arrival.
Recent advances in high dynamic range receivers, antenna techniques, adaptive signal processing, and ionospheric ray path prediction, along with improved measurement and modeling techniques suggest a dramatic improvement in HF reception and geolocation is possible.
The HFGeo Program aims to dramatically improve the ability to geolocate and characterize HF emitters. Required technical innovations include 1) the ability to accurately resolve multiple angles-of-arrival and polarization states through novel antenna concepts , 2) the ability to enhance signal-to-noise ratio and signal detection through the use of multi-dimensional adaptive signal processing, 3) the ability to accurately determine the state of the ionosphere and 4) integration of these component technologies into geolocation and source characterization applications. If successful, HFGeo will deliver rigorously tested technology capable of accurately geolocating and characterizing HF sources.
This BAA is for Phase 1A only to develop new concepts for advanced sensors and signal processing. Subsequent phases may address future challenges, such as ionospheric modeling, integration of these technologies into a prototype system, real-time processing and field demonstrations.
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