Abstract:

To deal with the target detection problem in the complex interception engagement where some jamming barriers exist, a novel fractionated guidance strategy is presented. In this strategy, two flight vehicles are adopted to implement target observation and interception respectively, and high precision guidance information can be obtained indirectly via proper information fusion and trajectories design. The fractionated guidance engagement is described firstly in terms of mathematical models of relative motion and detection. Then the detection characters of fractionated guidance are analyzed in terms of the estimated Cramer-Rao low bound of the relative states between the interceptor and target. The analysis results show that the observation trajectory is of critical importance to the improvement of target detection. Furthermore, the observation trajectory design problem is formulized as a multi-object dynamic optimization problem with the tradeoff between the target detection accuracy and the observer’s fuel consumptions. To improve the numerical calculation efficiency of the problem, an optimization algorithm based on decomposition is introduced. Finally, the validness of the proposed fractionated guidance strategy is demonstrated by simulation results.

Key words: Fractionated flight vehicles, Complicated detection environment, Trajectory optimization, Cramer Rao low bound, Multi object dynamic optimization