| For Parachute-Bomb System, stable scanning is key factor having influence onoperational effectiveness and dynamic characteristics is extremely complex. Based ontheoretical analysis and numerical, the analysis of the characteristics of movement wasrespectively carried out. On this basis research the trajectory filter algorithm was established.First, parachute-bomb system structure model was illustrated. Respectively, the dynamicmodel of projectile flight, decelerating and rotating stage and stable scanning stage weredetailed analyzed. Based on Lagrange mechanics, a seven-degree of freedom multi-bodydynamic model of the terminal descent of parachute-bomb system is developed.Secondly, the geometric model of parachute-bomb system is built in Pro/E and then setup dynamic model of the system in Adams, and the parachute-bomb system dynamicsimulation is made in Adams.The ballistic characteristics of stable scanning were analyzed,the movement law of the parachute-bomb system parachute-opening and the scan laws ofsensitive implement are gained. The results can be a theoretical reference for optional designof target-sensitivity-projectile.Finally, in order to effectively use flight data measured by radar for optimal estimation ofterminal sensing ammunition, four-degree of freedom dynamic equations of the terminaldescent of parachute-bomb system and observation equations were developed. The simulationon the stable scanning trajectory estimation problem was implemented by using ExtendedKalman Filter(EKF) and Unscented Kalman Filter(UKF) respectively. The stable scanningtrajectory parameters were obtained rapidly and accurately. The stable scanning trajectory wasreconstructed via effectively using the practical trajectory flight data measured by radar, andthe optimal estimation of flight data measured by radar was implemented. The simulation results indicate that the UKF is better than EKF with relation to robust, the estimationprecision and computational efficiency. |
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