초록 ▼

A spacecraft attitude and/or velocity control system includes a controller which responds to at least attitude errors to produce command signals representing a force vector F and a torque vector T, each having three orthogonal components, which represent the forces and torques which are to be genera

A spacecraft attitude and/or velocity control system includes a controller which responds to at least attitude errors to produce command signals representing a force vector F and a torque vector T, each having three orthogonal components, which represent the forces and torques which are to be generated by the thrusters. The thrusters may include magnetic torquer or reaction wheels. Six difference equations are generated, three having the form [Figure] and [Figure] where aj is the maximum torque which the jth thruster can produce, bj is the maximum force which the jth thruster can produce, and aj is a variable representing the throttling factor of the jth thruster, which may range from zero to unity. The six equations are summed to produce a single scalar equation relating variables aj to a performance index Z: [Figure] Those values of aaj are applied to control the corresponding thrusters.

대표청구항 ▼

A method for controlling the attitude and velocity of a spacecraft, comprising the steps of: generating sensed signals representative of pitch, roll, yaw and at least velocity error of said spacecraft; from said sensed signals, generating command signals representing a force vector F, and torque vec

A method for controlling the attitude and velocity of a spacecraft, comprising the steps of: generating sensed signals representative of pitch, roll, yaw and at least velocity error of said spacecraft; from said sensed signals, generating command signals representing a force vector F, and torque vector T to be generated by said thrusters, said force vector F including mutually orthogonal components F1, F2 and F3, and said torque vector T including mutually orthogonal components T1, T2 and T3, some or all of which said F1, F2, F3 and T1, T3 and T3 can from time to time take on zero magnitude; generating difference signals representing six difference equations D1j, a2j and a3j are the maximum torques which the jth thrusters can produce about the 1st, 2nd and 3nd axes; bij b2j b3j are the maximum forces which the jth thrusters can produce along the 1st, 2nd and 3rd axes; and ath thruster, which can take on volumes ranging from zero to unity; summing said difference signals to form a single scalar equation relating the variable aaa