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Double rotation inertial measurement apparatus

  • US 4,017,187 A
  • Filed: 06/23/1975
  • Issued: 04/12/1977
  • Est. Priority Date: 06/23/1975
  • Status: Expired due to Term
First Claim
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1. Inertial measurement apparatus comprising:

  • a plurality of equi-spaced ring laser means similarly disposed upon an inner spin member about a spin axis, thereof,all of said ring laser means being disposed in individual planes at equal predetermined angles with respect to said spin axis,spin motor means for rotating said inner spin member about said inner spin axis in a predetermined direction for eliminating mode-lock operation of each of said ring laser means within a predetermined operating range and whereby first components of bias and scale factor errors of the ring laser means outputs are cancelled,drive frame means including first trunnion means for supporting said inner spin member therein,reversible motor means for reversibly rotating said drive frame means about a second axis substantially perpendicular to said inner spin axis whereby second components of bias and scale factor errors of said ring laser means output are cancelled, andfixed frame means including second trunnion means for supporting said drive frame means for reversible rotation about said second axis,said reversible motor means serving to drive said drive frame means with respect to said fixed frame means through successive integral numbers of revolutions after respective successive reversals thereof.

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