6 October 2011 Infrared decoy and obscurant modelling and simulation for ship protection
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Imaging seekers used in modern Anti Ship Missiles (ASMs) use a variety of counter countermeasure (CCM) techniques including guard gates and aspect ratio assessment in order to counter the use of IR decoys. In order to improve the performance of EO/IR countermeasures it is necessary to accurately configure and place the decoys using a launcher that is trainable in azimuth and elevation. Control of the launcher, decoy firing times and burst sequences requires the development of algorithms based on multi-dimensional solvers. The modelling and simulation used to derive the launcher algorithms is described including the countermeasure, threat, launcher and ship models. The launcher model incorporates realistic azimuth and elevation rates with limits on azimuth and elevation arcs of fire. A Navier Stokes based model of the IR decoy includes thermal buoyancy, cooling of the IR smoke and its extinction properties. All of these factors affect the developing size, shape and radiance of the decoy. The hot smoke also influences the performance of any co-located chaff or other obscurant material. Typical simulations are described against generic imaging ASM seekers using shape discrimination or a guard gate.
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Brian Butters, Brian Butters, Edgar Nicholls, Edgar Nicholls, Roy Walmsley, Roy Walmsley, Richard Ayling, Richard Ayling, "Infrared decoy and obscurant modelling and simulation for ship protection", Proc. SPIE 8187, Technologies for Optical Countermeasures VIII, 81870Q (6 October 2011); doi: 10.1117/12.898654; https://doi.org/10.1117/12.898654

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