12 August 2004 Passive position-adaptive radar modes for non-LOS interrogation of embedded targets
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A position-adaptive radar system concept is presented for purposes of interrogating difficult and obscured targets via the application of low-altitude smart or robotic-type UAV platforms. Under this concept, a high-altitude radiating platform is denoted as a HUAV and a low-altitude “position-adaptive” platform is denoted as a LUAV. The system concept is described by two modes. In Mode-1, real-time onboard LUAV computation of a phase parameter denoted as “signal differential path length” allows the LUAV to position-adaptively isolate a “signal leakage point”, for example, between two buildings. After the LUAV position-adaptively converges to an optimum location, the system enters Mode-2. Under this Mode-2 concept, a technique denoted as “exploitation of leakage signals via path trajectory diversity” (E-LS-PTD) is developed. This technique is based on modulating scattering centers on embedded objects by implementing a fast trajectory on the HUAV while the LUAV is hovering in front of an “obscuration channel.” Analytical results include sample outputs from an initial set numerical electromagnetic simulations.
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Atindra K. Mitra, Atindra K. Mitra, } "Passive position-adaptive radar modes for non-LOS interrogation of embedded targets", Proc. SPIE 5410, Radar Sensor Technology VIII and Passive Millimeter-Wave Imaging Technology VII, (12 August 2004); doi: 10.1117/12.541065; https://doi.org/10.1117/12.541065

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