Abstract
Some existing three-body cooperative guidance methods for terminal interception rely on the attacker’s future-maneuver prediction or explicit forecasting of its future maneuver and may require high overload demand. Therefore, this paper presents an improved terminal cooperative guidance law, referred to as LOS-OCG (LOS-based Optimal Cooperative Guidance), by integrating modified line-of-sight (LOS) geometry and optimal control. An optimal performance index with terminal soft objectives on miss distance, LOS angle and target velocity direction is constructed to solve the cooperative control equation. Geometric sign heuristic analysis is employed to qualitatively examine the convergence trend and to calculate the rough initial aiming, followed by multi-condition comparison, Monte Carlo verification and batch simulations. Under the engagement conditions selected in this paper, Monte Carlo robustness tests with 18,000 runs across nine engagement configurations yield narrow 95% confidence intervals. Among the 6427 successful trajectories of 6435-trajectory batch grid, the defender’s peak overload remains below 6 g for 80.82%, below 9 g for 95.49%, and 97.15% achieve a defender maneuver effort no greater than 30% of the attacker’s. The proposed method features closed-form analytical gains within the single-cycle frozen framework, propagates a frozen surrogate of the current maneuver to the terminal time, and requires neither an identified attacker guidance law nor explicit multi-step maneuver forecasting. It exhibits acceptable robustness and presents a viable planar research concept for terminal cooperative interception.