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Computational scheme for MEMS inertial navigation system

  • US 7,957,898 B2
  • Filed: 12/28/2007
  • Issued: 06/07/2011
  • Est. Priority Date: 12/28/2007
  • Status: Active Grant
First Claim
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1. A method of updating three dimensional tracking of a platform by a micro-electro mechanical systems (MEMS) based INS, comprising the following steps of:

  • numerically integrating Northerly, Easterly, and downward velocities to track Northerly, Easterly, and vertical displacement from a reference point along a local tangent plane about the reference point;

    converting latitude and longitude into Northerly and Easterly displacement from the reference point using the Earth North-South and East-West curvatures computed for the reference point;

    ignoring the Earth rotation and the rotation of the local tangent plane with respect to Earth since they are much smaller than MEMS gyro noise and bias; and

    assuming the platform orientation conditions of;



    90 (deg)<

    pitch<

    90 (deg)−

    90 (deg)<

    roll<

    90 (deg)to reduce the number of parameters rectuired to track in a direction cosine matrix.

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