In the light of the increasing terrorist SAMs threat to civil and military aircraft, theneed of a high-fidelity, low-cost, IR signature scene modelling and simulationcapability that could be used for development, testing and evaluation of IRCMsystems cannot be overlooked.The performance evaluation, training and testing of IR missiles or other IR basedweapon systems, is very expensive and is also dependent upon atmospheric factors.Whereas, the computer based non-destructive simulation can provide a cost-effectivealternative to field trials.An effort has been made to model the IR scene signature using virtual realitymodelling tools and integrating this model into the missile-target engagement andcountermeasure simulator. The developed algorithm can simulate passive IR imagingseeker engagements with aerial targets. The presented algorithm uses the developedmodels for IR signature of the target, the background, the flare spectral and temporalresponses and the flare ballistic trajectory. The missile guidance, auto-pilot andtracker algorithms have also been developed. The atmospheric conditions have beenmodelled, using LOWTRAN, as “good”, “typical” or “bad” to account foratmospheric transmittance and the sky-radiance. The results were analysed andvalidated through four test scenarios. The code is written in MATLAB which gives itopenness for user verification/validation and also flexibility for any futuremodifications.The work presented may help the IRCM designer and pilots to evaluate potentialstrategies to defeat the imaging seeker threat.
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