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An interference-aided navigation system for a rotating vehicle provides rotation angle estimates using interference or jamming signals. An antenna receives interference signals and desired navigation signals. A RF processing function connected to the antenna processes the received interference signa

An interference-aided navigation system for a rotating vehicle provides rotation angle estimates using interference or jamming signals. An antenna receives interference signals and desired navigation signals. A RF processing function connected to the antenna processes the received interference signals and the desired navigation signals into IF signals. An A/D converter connected to the RF processing function digitizes the interference signals and desired navigation signals and to provide a digitized IF signal. A tracking filter tracks amplitude variations of the interference signals and provides the rotation angle estimate signal of the rotating vehicle.

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An interference-aided navigation system for a rotating vehicle provides rotation angle estimates using interference or jamming signals. An antenna receives interference signals and desired navigation signals. A RF processing function connected to the antenna processes the received interference signa

An interference-aided navigation system for a rotating vehicle provides rotation angle estimates using interference or jamming signals. An antenna receives interference signals and desired navigation signals. A RF processing function connected to the antenna processes the received interference signals and the desired navigation signals into IF signals. An A/D converter connected to the RF processing function digitizes the interference signals and desired navigation signals and to provide a digitized IF signal. A tracking filter tracks amplitude variations of the interference signals and provides the rotation angle estimate signal of the rotating vehicle. luble metal compound. 9. The production method of claim 8, wherein the metal ions are selected from the group consisting of Ni ions, Ga ions, Y ions, Pr ions, Gd ions, Ho ions, Yb ions and Bi ions. 10. The production method of claim 7, wherein said aqueous solution contains at least one seed crystal comprising metal oxide which is the same as that formed from the metal fluoro complex compound. 11. The production method of claim 7, wherein the metal of the metal fluoro complex compound is titanium. 12. A method for producing a composite composed of a mixture containing at least one metal oxide derived from at least one metal fluoro complex compound, which comprises adding a fluoride ion-capturing agent to an aqueous solution containing the metal fluoro complex compound to precipitate the composite, wherein said aqueous solution contains at least one water-soluble metal compound, and the composite to be formed is at least one metal oxide which is derived from the metal fluoro complex compound and doped with metal ions derived from the water-soluble metal compound. 13. The production method of claim 12, wherein the metal ions are selected from the group consisting of Ni ions, Ga ions, Y ions, Pr ions, Gd ions, Ho ions, Yb ions and Bi ions. 14. The production method of claim 12, wherein the metal of the metal fluoro complex compound is titanium. 15. The production method of claim 12, wherein said aqueous solution contains at least one seed crystal comprising metal oxide which is the same as that formed from the metal fluoro complex compound.