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Gps receiver

  • US 20060145917A1
  • Filed: 06/06/2002
  • Published: 07/06/2006
  • Est. Priority Date: 06/06/2002
  • Status: Abandoned Application
First Claim
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1. A GPS receiver, comprising:

  • a receiving portion, receiving navigation messages transmitted from a plurality of GPS satellites respectively;

    a navigation message analyzing portion, obtaining an ephemeris and an almanac from the received navigation message to restore;

    an ephemeris storing portion, storing the obtained ephemeris;

    an almanac storing portion, storing the restored almanac;

    a clock portion, measuring a time to calculate a current time;

    a satellite position calculating portion, calculating positions of the plurality of GPS satellites by using the current time calculated in the clock portion and the obtained ephemeris or the restored almanac; and

    a position measuring portion, calculating a position measuring based on the navigation message transmitted from the GPS satellite as a communication object, wherein the navigation message analyzing portion includes a predicting portion which predicts a time information stored only in a final subframe, which serves as a reference to calculate positions of the plurality of GPS satellites, based on information indicating a lapsed week number on a basis of a predetermined week stored in each main frame of the received navigation message respectively, and a restoring portion which restores the almanac based on the predicted time information which serves as the reference to calculate the positions of the plurality of GPS satellites.

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