Enhanced inertial measurement unit/global positioning system mapping and navigation process

CAFC
  • US 6,792,353 B2
  • Filed: 02/07/2003
  • Issued: 09/14/2004
  • Est. Priority Date: 09/26/2000
  • Status: Active Grant
First Claim
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1. An enhanced inertial measurement unit/global positioning system and map navigation process, comprising steps of:

  • (a) receiving a measured position from an integrated inertial measurement unit/global positioning system device, wherein said integrated inertial measurement unit/global positioning system device comprises a micro IMU, a GPS receiver and means for blending measurements from said micro IMU and said GPS receiver;

    (b) retrieving geospatial data from a geospatial map database based on said measured position from said integrated inertial measurement unit/global positioning system device by using a tile index file, wherein s aid tile index file stores geographic extent information of tiles which are geographically subdividing a coverage solely for a purpose of enhancing data management;

    wherein a geographic extent of an access area is compared with said geographic extent of said tiles to derive a plurality of involved tiles for said access area;

    (c) performing time-space filtering based on said measured position and said retrieved geospatial data from said geospatial map database to derive a displaying position for a user;

    wherein said measured position and a previous position and a previous velocity are used to derive a true position for said user; and

    (d) displaying a trajectory of said user on a graphic displaying unit, which tracks a motion of said user.

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