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Aircraft Signature Studies Using Infrared Cross Section and Infrared Solid Angle

, Pallavi Rastogi, Ashish Bhatt

Abstract: Aircraft infrared (IR) signature studies are complex, due to their dependence on several parameters, e.g., line of sight (LOS) and viewing aspect (LOS^). There is no equivalent counterpart of the well-known radar cross section (RCS) that can be easily used for obtaining IR lock-on range, RLO,λ1−λ2. This study introduces the concept of IR cross section (IRCS)λ1−λ2 of complete aircraft as seen by seeker in λ1–λ2 band in LOS^ and of aircraft part in an orthogonal view. The IR solid angle (ωIR,λ1−λ2) subtended by (IRCS)λ1−λ2 of complete aircraft and of an aircraft part is also introduced, which is the basis for redefined general criterion for lock-on by IR-guided missile. Equality based on ωIR,λ1−λ2 at aircraft part level and at complete aircraft level is the basis for obtaining RLO,λ1−λ2 of complete aircraft in terms of its (IRCS)λ1−λ2. Dimensionless scalar factor, ΠIRCS,λ1−λ2, converting visual area to (IRCS)λ1−λ2 is studied, for temperatures ranging from close to ambient to maximum afterburning (reheat) mode of aeroengine. The ΠIRCS,λ1−λ2 enables assessment of effectiveness of IR seekers with single or dual bands, for all-aspect engagement and for rear-view only.
Keywords: aircraft / ωIR / ΠIRCS / solid / Angle / seeker / lock

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