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AINS enhanced survey instrument

  • US 20090024325A1
  • Filed: 07/19/2007
  • Published: 01/22/2009
  • Est. Priority Date: 07/19/2007
  • Status: Abandoned Application
First Claim
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1. An aided inertial navigation system (AINS) enhanced precision land survey instrument comprising:

  • a survey pole having a survey pole top end and a survey pole bottom end,a position-transducer fixed to the survey pole at a predetermined location, on the pole, a distance between the position transducer and the survey pole bottom end, the position transducer providinga sequence of earth referenced position signals that characterize the earth referenced position of the position transducer,a ground contact zero velocity indicator (GCZVI) switch module coupled to the survey pole bottom end to providea zero velocity signal when the survey pole bottom end is in contact with the ground,an AINS rigidly coupled to the survey pole, the AINS supplying roll, pitch and heading signals of the survey pole with respect to a ground referenced locally level coordinate system that characterize the tilt and heading of the survey pole,a computer and program means responsive to the roll, pitch and heading signals, the zero velocity signal and the predetermined distance from the position-transducer to the survey pole bottom end for calculating and adding North, East and Down vectors in an earth referenced locally level co-ordinate system leading from the position of the position transducer to the position of the survey pole bottom end to obtain the earth referenced position of the survey pole bottom end when the survey pole bottom end is in contact with the ground.

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