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Accurately predicting propagation loss is critical to determining if an area can support passive bistatic radars (PBRs), which must rely on illuminators of opportunity and might operate near the threshold of detection for weak targets. Models available to calculate propagation loss vary in their complexity and might include factors such as terrain, refraction, clutter, and multipath. This paper reports...
A case study of the trade off between fidelity and complexity is presented for a passive radar simulator. Although it is possible to accurately model the underlying physics, signal processing, and environment of a radar, the resulting model might be both too complex and too costly to evaluate. Instead, simplifications of various model attributes reduce the complexity and permit fast evaluation of...
This paper proposes an approach for implementing sense-and-avoid on small unmanned aircraft. The system uses two complimentary passive instruments. First, a passive radar is used to sense a volume around the protected aircraft and identify potential conflicts. Second, an EO/IR system focuses on the targets generated by the passive radar and is used to confirm and classify threat aircraft. Proof-of-concept...
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