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GSP/Doppler sensor velocity derived attitude reference system

  • US 4,405,986 A
  • Filed: 04/17/1981
  • Issued: 09/20/1983
  • Est. Priority Date: 04/17/1981
  • Status: Expired due to Fees
First Claim
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1. An attitude reference control system for a vehicle comprising:

  • a receiver/processor including;

    an antenna for receiving ranging signals from a plurality of orbiting navigation satellites;

    storage apparatus for storing signals representing ephemeris information relating to said satellites;

    a correlator device providing range and range rate signals from said ranging signals and for correlating said range and range rate signals with said stored signals to provide signals representing the vehicle'"'"'s velocity along the local meridian, Vn, its velocity along the local parallel of latitude, Ve, and its vertical velocity, Vv ;

    a directional gyroscope providing a vehicle heading reference signal, H;

    a converter circuit connected to said receiver/processor and said directional gyroscope for correlating said local meridian velocity signal, Vn, and said local parallel velocity signal, Ve, with said heading reference signal, H, to provide signals representing the along-track velocity, Vh, and the cross-track velocity, Vd, of said vehicle;

    axial velocity sensing apparatus for measuring and providing signal representing the vehicle'"'"'s axial velocities, Vx, Vy and Vz along the roll, pitch and yaw axes, respectively;

    a velocity correlator connected to said axial velocity sensing apparatus and said converter circuit for correlating said along-track velocity and said cross-track velocity signals with said axial velocity signals to provide signals representing the instantaneous pitch and roll angles of said vehicles; and

    apparatus connected to said velocity correlator for utilizing said pitch and roll angle signals for the navigation of said vehicle.

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