جستجوی مقالات مرتبط با کلیدواژه « هدایت ناوبری تناسبی » در نشریات گروه « فنی و مهندسی »

In current research, a new optimal hybrid guidance law is developed based on classic guidance laws and fuzzy control approach. An optimized line of sight guidance law is designed for the midcourse phase. Proportional navigation method is also used for terminal phase. In order to smoothly switching between midcourse and terminal phases, an optimal fuzzy approach is developed. Two excising multi-objective heuristic optimization algorithms are evaluated for optimal fuzzy switch problem and the non-dominated sorting gravitational search algorithm is chosen due to its less computational run time. A data bank of optimal switching conditions in several flight scenarios is derived and based on these optimal points, the optimal switching plan is derived for all missions. Also, the practical zone is determined. The advantage of the proposed approach is that it has been derived in presence of vehicle full nonlinear dynamic model. Different scenarios simulation results revealed the desirable performance of the proposed approach.

In this paper a novel optimal and robust proportional navigation (PN) guidance law for three dimensional missile-target system is proposed based on extended Kalman filter (EKF). New guidance law is a combination of PN، sliding mode and backstepping guidance laws. In this guidance law there are some coefficients that must be adjusted. Genetic algorithm (GA) is used to achieve this goal. Also، system states are estimated using extended Kalman-Bucy filter (EKBF). Finally، proposed guidance law (PN Backstepping (PNB)) is compared with augmented proportional navigation guidance (APNG) law. Simulation results indicatethat PNB law has far better performancecompared to APNG law.

In this paper، the linearized 2-D equations of proportional navigation guidance (PNG) are normalized in order to carry out the missdistance analysis considering acceleration saturation and radome effect. The control system dynamics is modeled using the first-order transfer function. To reduce the missdistance due to radome effect، the body rate feedback is added to the commanded acceleration in the analysis. Using this approach، useful normalized curves are obtained for parametric study and modification of PNG. Finally، the normalized equations of a modified PNG، having nonlinear terms consisting of line-of-sight rate with different powers، are derived.