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High speed well surveying and land navigation

  • US 4,833,787 A
  • Filed: 06/11/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 08/23/1985
  • Status: Expired due to Fees
First Claim
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1. In a land vehicle navigation apparatus, the combination comprising(a) intertial angular rate sensor means having a sensitive axis,(b) inertial acceleration or tilt sensor means having at least two sensitive axes, said sensitive axes being nominally orthogonal to said inertial angular rate sensor'"'"'s sensitive axis,(c) means to accept from an external source an initial value of the vehicle'"'"'s azimuthal orientation angle with respect to an Earth-fixed coordinate set, and(d) circuitry operatively connected with said (a) and (b) sensor means and said (c) input acceptance means to determine three vehicle orientation angle, roll, pitch, and azimuth, with respect to an Earth-fixed coordinate set as the land vehicle travels over the Earth surface, and wherein changes to said azimuth angle during travel are determined by integration of the output of said (a) sensor means,(e) and a land vehicle supporting said (a) and (b) means, and having support means on which the vehicle travels over the Earth'"'"'s surface.

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