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Portable GPS receiver

  • US 6,009,375 A
  • Filed: 10/10/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 10/10/1997
  • Status: Expired due to Term
First Claim
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1. A portable GPS receiver carried by a person who is in a location and walks or runs a distance at a speed, said GPS receiver being adapted to receive GPS signals from GPS satellites, said GPS signals containing carrier waves having Doppler frequencies, said GPS receiver acting to measure the location of said GPS receiver and the Doppler frequencies of the carrier waves and to determine the speed from said Doppler frequencies, said GPS receiver comprising:

  • a walk-detecting means for detecting walking or running of the person and producing a walk signal indicative of the walking;

    a step number-calculating means for receiving said walk signal, calculating number of steps taken in walking, and producing a step number signal indicative of said number of steps;

    a time-measuring-and-timing signal-generating means for measuring time and generating both a time signal and a reference timing signal;

    a first distance-calculating means for receiving a signal indicating said determined speed, said time signal, and said reference timing signal, calculating the distance from said speed, and producing a first distance signal indicative of said calculated distance;

    a stride-calculating means for receiving said first distance signal and said step number signal, calculating a stride per step, and producing a stride signal indicative of said calculated stride;

    a second distance-calculating means for receiving said step number signal and said stride signal, calculating a distance traveled by said person, and producing a second distance signal indicative of said calculated distance;

    a speed-calculating means for receiving said second distance signal, said time signal, and said reference timing signal, calculating the speed of said person, and producing a speed signal indicative of said calculated speed;

    a display means for receiving said second distance signal, said speed signal, said timing signal and displaying said second distance, said speed, and said time; and

    a reception operation control means for receiving said time signal and said timing signal and acting to start reception operation of said GPS receiver at regular intervals of time and to end said reception operation after a lapse of a given time.

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