Interpretation of Kennaugh´s physical optics impulse response approach for the slightly bistatic case

An analytical time-domain expression is derived for the early time impulse response for smooth, convex, perfectly conducting scatterers under the physical optics approximation for the bistatic case restricted to limited bistatic angles. The physical optics bistatic early time impulse responses can still be interpreted as cross-sectional areas of the scatterer similar to what was done by Kennaugh for the monostatic case. It can be shown that the early time impulse response satisfies Kell´s monostatic-bistatic equivalence statement. An extension of Bojarski´s identity is also obtained for the bistatic case.