초록 ▼

An apparatus and method of unified orbit and attitude control for acquisition and maintenance techniques of multiple satellites in a formation based on GPS input, utilizing Modern Feedback Control for providing precise autonomous on-board orbit and attitude control. This control system can place and

An apparatus and method of unified orbit and attitude control for acquisition and maintenance techniques of multiple satellites in a formation based on GPS input, utilizing Modern Feedback Control for providing precise autonomous on-board orbit and attitude control. This control system can place and maintain any satellite in its designated location in a formation, while simultaneously providing the capability to attain and maintain the attitude of any of the satellites in the formation with respect to the reference `head-of-fleet' satellite. Utilizing the two different options of GPS signal, code pseudo range for orbit determination and control and phase pseudorange for attitude determination and control, the relative orbit and attitude state vectors of all the satellites in the formation is determined and modern advanced multivariable feedback control techniques, for example, linear quadratic Gaussian/loop transfer recovery controllers for orbit control and Sliding Controller or Lyapunov Controller for attitude control are used to provide a unified orbit and attitude control. The control of acquisition and maintenance for multiple spacecraft formation flying is a tracking problem, which can be converted into a regulator problem using the relative orbit and relative attitude kinematics and dynamics.

대표청구항 ▼

1. An on-board system for a first body in motion comprising:a closed loop multivariable orbit controller; a closed loop multivariable attitude controller; a first and second receiver that receives positioning data; an orbit converter that converts an orbit control problem into an orbit state-space f

1. An on-board system for a first body in motion comprising:a closed loop multivariable orbit controller; a closed loop multivariable attitude controller; a first and second receiver that receives positioning data; an orbit converter that converts an orbit control problem into an orbit state-space form; wherein the orbit controller uses the positioning data to determine the body's position in an inertial coordinate system and uses the orbit state-space form to determine if the position of the first body needs to be altered in real time for minimization of at least one of position, position error, velocity and velocity error between the first body and a target; and an attitude converter that converts an attitude control problem into an attitude state-space form; wherein the attitude controller uses the positioning data to determine the body's attitude and uses the attitude state-space form to determine if the position of the first body needs to be altered in real time for minimization of at least one of attitude, attitude angle, attitude angle error, angular velocity and angular velocity error between the first body and the target in the formation.