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exoatmospheric-targets
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Coupled Trajectory and Attitude Control of an Exoatmospheric Interceptor
, M.Sc. Thesis Sharif University of Technology ; Nobahari, Hadi (Supervisor)
Abstract
In this thesis, coupled trajectory and attitude control of an exoatmospheric interceptor is investigated. The interceptor is considered to track and intercept orbital targets in its terminal phase using an infrared strapdown seeker. Attitude control system uses its thrusters in order to keep permanently the detector toward the target in both elevation and azimuth directions. Detector is attached to the body. Divert thrusters generate acceleration perpendicular to the longitudinal axis of the interceptor to correct the trajectory. It is assumed that the interceptor has mass asymmetries. Transltional and rotational dynamics are coupled. Therefore, in order to improve the performance of...
Design of Trajectory and Guidance Algorithm of a Ground-Based System Against Exoatmospheric Targets
, M.Sc. Thesis Sharif University of Technology ; Nobahari, Hadi (Supervisor)
Abstract
In this thesis a hybrid guidance law has been designed for a ground-based system to intercept an exoatmospheric target. In this regard a three stage interceptor with a kinetic kill vehicle has been proposed, the design parameters of which are determined according to a conceptual design procedure. The guidance law consists three phases namely boost, midcourse and terminal phases. In boost phase, a ballistic guidance law steers the first and the second stages of the interceptor ahead of the predeicted intercept point. In the midcourse phase, the third stage of the interceptor corrects the engagement plane while it also provides the head on interception condition for the kinetic kill vehicle....
Elastodynamic Behaviour Analysis of Interceptor Flight Vehicle in Space
, M.Sc. Thesis Sharif University of Technology ; Haddadpour, Hassan (Supervisor)
Abstract
In this thesis, the effect of elastodynamic behaviour of an interceptor on it’s trajectory in space and accuracy in desired positioning and situation is investigated. The governing equations of motion are derived and linearized by using the basic equations of motion in the body frame axes and the mode summation method for elastic deformations. In order to control the interceptor, the closed-loop control on the yaw and pitch angles, is considered. The governing equations of motion are solved to determine the time response to investigate the structural effects on the stability, position and situation of interceptor. Finally, the effect of elasticity and vibrations on the interceptor’s...