Ray reversal in SBR RCS calculations

The radar return from jet engine cavities has been particularly difficult to predict using computational electromagnetics (CEM). At many radar frequencies of interest engine cavities are too electrically large for the use of low-frequency techniques so high-frequency methods such as Shooting and Bouncing Rays (SBR) are used. This paper proposes the inclusion of reverse ray paths to improve the accuracy of cavity RCS predictions. This approach can be implemented into existing SBR code almost trivially, while producing potentially substantial improvements in prediction accuracy.