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Positioning device, method of controlling positioning device, and recording medium

  • US 7,557,750 B2
  • Filed: 08/03/2007
  • Issued: 07/07/2009
  • Est. Priority Date: 08/25/2006
  • Status: Expired due to Fees
First Claim
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1. A positioning device comprising:

  • an estimated height storage section which stores an estimated height;

    a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite;

    a two-dimensional height calculation section which calculates a height of a present position as a two-dimensional height by performing two-dimensional positioning which locates the present position based on the received satellite signals using the estimated height as a distance from the center of the earth;

    a three-dimensional height calculation section which calculates the height of the present position as a three-dimensional height by performing preliminary three-dimensional positioning which preliminarily locates the present position based on the received satellite signals without using the estimated height when performing the two-dimensional positioning;

    a height selection section which selects the two-dimensional height or the three-dimensional height for updating the estimated height stored in the estimated height storage section; and

    an updating section which updates the estimated height stored in the estimated height storage section using the two-dimensional height or the three-dimensional height selected by the height selection section.

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