PROJECT TITLE :
MIMO-OTH Radar: Signal Model for Arbitrary Placement and Signals With Non-Point Targets
Taking into account the existence of multipath ionospheric propagation (MIP), a typical phenomenon that skywave over-the-horizon (OTH) radar might encounter, this paper develops the received signal model for a non-point target for multiple-input multiple-output skywave over-the-horizon (MIMO-OTH) radar using the foremost well accepted physics-based model of the ionosphere. The signal model describes the ionospheric state, the quantity of propagation paths between a radar antenna and therefore the target center, as well as the correlation between reflection coefficients. It's shown that varying system parameters, such as antenna positions and signal frequencies, will end in causing the model to alter from a case with highly correlated reflection coefficients, for some methods, to a case with virtually uncorrelated reflection coefficients for these same ways. Conditions are presented that describe when the highly correlated reflection coefficient case applies and when the nearly uncorrelated reflection coefficient case applies. Then, the proposed model is used to resolve an example target detection downside. Some cases are shown where the performance might improve when more methods are present. The maximum potential diversity is computed and shown to increase with the quantity of paths which partially explains these observations. It is shown within the studied example that even if the receive antennas are closely spaced, full diversity gain could be obtained because of MIP.
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