Signal source position-determining process
Tactical nagivation and communication system
Topographical mapping radar
Traveling wave interferometry particularly for solar power satellites Patent #: 4368469
ApplicationNo. 06/416646 filed on 09/10/1982
US Classes:342/357.11, Attitude determination342/420, With error or deviatioan compensator or eliminator342/424Tracking interferometer
ExaminersPrimary: Blum, Theodore M.
Assistant: Issing, Gregory C.
Attorney, Agent or Firm
International ClassesG01S 5/02 (20060101)
G01S 5/14 (20060101)
AbstractAn attitude sensing system which incorporates the precision in attitude sensing of a satellite navigation system with the dynamic tracking capabilities of an inertial measurement unit. Optimally estimated attitude and system error signals are combined with the outputs of an inertial measurement unit to control the phase differences of signals received on an interferometer array from a navigation satellite. The outputs from the inertial measurement unit and the phase differences are processed in an optimal estimator filter to produce periodically updated attitude and system error signals. This permits inertial attitude sensing to benefit from the long term accuracy of attitude estimation based upon signals from the satellite navigation system. During conditions of high dynamic maneuvering in which attitude changes are rapid, the output of the inertial measurement unit continues to provide attitude information and controls the attitude sensing loop to insure that the system is not disoriented by such high dynamic conditions.