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Systematic vectored thrust calibration method for satellite momentum control

  • US 5,765,780 A
  • Filed: 12/22/1995
  • Issued: 06/16/1998
  • Est. Priority Date: 12/22/1995
  • Status: Expired due to Term
First Claim
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1. A momentum control system for a spacecraft having a propulsion system in which a disturbance is exerted on the spacecraft, said system comprising:

  • a control processor for receiving an attitude signal representative of the attitude motion of said spacecraft and processing said attitude signal to generate a state variable signal representative of one or more state variables of said spacecraft;

    a system identification processor which receives said state variable signal and isolates a signal which has the characteristics of said disturbance exerted on said spacecraft, said system identification processor generating a pseudo input signal for said isolated disturbance which within a multiplicative constant has substantially the same shape, when plotted as a function of time, as the actual disturbance would have if it had been measured,said system identification processor processing said pseudo input signal to generate a thruster torque signal representative of a thruster torque generated by said propulsion system;

    a propulsion processor for receiving said thruster torque signal and generating a control command signal representative of a maneuver to be performed by said propulsion system, said propulsion processor comprising a thruster calibration alignment processor which calculates the mass properties of said spacecraft in response to said thruster torque signals; and

    wherein said control command signal is sent to said control processor which aligns said propulsion system in response to said control command signal.

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