Improving the Accuracy–Compute Trade-off in High-Speed Unguided Engagements: A Dual-Resolution Hit Determination Framework

In high-speed unguided engagement simulations, time-step resolution governs both the reliability of hit determination and computational cost. We propose a dual-resolution framework that combines firing-time alignment with encounter-region refinement. The key idea is to allocate fine resolution only around the firing event and the near-encounter window, thereby reducing missed hits caused by sampling gaps without refining the entire timeline. Using a simplified 2-D model with Monte Carlo experiments, we show that the proposed method achieves comparable hit determination with less computation than a fixed-step baseline. We also verify that end-phase refinement alone is not sufficient unless firing-time alignment is considered. Finally, we discuss the potential for multi-rate integration within larger engagement-level simulators.