초록 ▼

An accurate and constantly updated attitude instrument is provided for aircraft. The pitch and roll angles are calculated from two sets of velocity measurements, one set being derived from signals received from orbiting navigational satellites and the other set from on-board equipment which determin

An accurate and constantly updated attitude instrument is provided for aircraft. The pitch and roll angles are calculated from two sets of velocity measurements, one set being derived from signals received from orbiting navigational satellites and the other set from on-board equipment which determines the aircraft\s axial velocities. The on-board equipment may be a Doppler ground-speed sensor or an inertial system using accelerometers, the outputs of which are integrated to derive the axial velocities.

대표청구항 ▼

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 correlat

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.