Portable GPS type distance/speed meter capable of selectively using doppler speed measuring method

A portable distance/speed meter that may be carried by a user, comprising:

• a GPS (Global Positioning System) receiver for receiving GPS electromagnetic waves transmitted from GPS satellites and acquiring positioning data from the received GPS electromagnetic waves;
• first distance calculating means for calculating a travel distance of the user between two different positions as a first distance based upon a difference between positional information contained in the positioning data acquired at the two positions;
• second speed calculating means for calculating a travel speed of the user as a second speed based upon Doppler shift frequency information contained in the positioning data;
• timer means for measuring a first travel time of the user over the first distance and a second travel time of the user at the second speed;
• first speed calculating means for calculating a travel speed of the user as a first speed based upon both the first distance calculated by the first distance calculating means and the first travel time measured by the timer means;
• second distance calculating means for calculating a travel distance of the user as a second distance based upon both the second speed calculated by the second speed calculating means and the second travel time measured by the timer means;
• abnormal value detecting means for detecting an abnormal value of the first speed calculated by the first speed calculating means, the abnormal value being a calculated speed value larger than that which the user can travel;
• speed selecting means for selecting the first speed when the abnormal value of the first speed is not detected by the abnormal value detecting means, and for selecting the second speed when the abnormal value of the first speed is detected by the abnormal value detecting means;
• distance selecting means for selecting the first distance when the abnormal value of the first speed is not detected by the abnormal value detecting means, and for selecting the second distance when the abnormal value of said first speed is detected by the abnormal value detecting means;
• average speed calculating means for calculating an average travel speed of the user by employing the selected one of the first speed and the second speed selected by the speed selecting means;
• and
• distance accumulating means for calculating an accumulated distance by employing the selected one of the first distance and the second distance selected by the distance selecting means.

A portable distance/speed meter that may be carried by a user, comprising:

• a GPS (Global Positioning System) receiver for receiving GPS electromagnetic waves transmitted from GPS satellites and acquiring positioning data from the received GPS electromagnetic waves;
• a first distance calculating circuit for calculating a travel distance of the user between two different positions as a first distance based upon a difference between positional information contained in the positioning data acquired at the two positions;
• a timer for measuring travel time of the user over the first distance;
• a first speed calculating circuit for calculating a travel speed of the user as a first speed based upon both the first distance calculated by the first distance calculating circuit and the travel time measured by the timer;
• an abnormal value detecting circuit for detecting an abnormal value of the first speed calculated by the first speed calculating circuit, the abnormal value being a calculated speed value larger than that which the user can travel;
• an average speed calculating circuit for calculating an average travel speed of the user based upon first speed values calculated by the first speed calculating circuit excluding abnormal value of the first speed detected by the abnormal value detecting circuit;
• and
• a distance accumulating circuit for accumulating the first distance calculated by the first distance calculating circuit so as to calculate an accumulated distance excluding first distance values corresponding to abnormal values of the first speed detected by the abnormal value detecting circuit.

A portable distance/speed meter that may be carried by a user, comprising:

• a GPS (Global Positioning System) receiver for receiving GPS electromagnetic waves transmitted from GPS satellites and acquiring positioning data from the received GPS electromagnetic waves;
• a first distance calculating circuit for calculating a travel distance of the user between two different positions as a first distance based upon a difference between positional information contained in the positioning data acquired at the two positions;
• a second speed calculating circuit for calculating a travel speed of the user as a second speed based upon Doppler shift frequency information contained in the positioning data;
• a timer for measuring a first travel time of the user over the first distance and a second travel time of the user at the second speed;
• a first speed calculating circuit for calculating a travel speed of the user as a first speed based upon both the first distance calculated by the first distance calculating circuit and the first travel time measured by the timer;
• a second distance calculating circuit for calculating a travel distance of the user as a second distance based upon both the second speed calculated by the second speed calculating circuit and the second travel time measured, by the timer;
• an abnormal value detecting circuit for detecting an abnormal value of the first speed calculated by the first speed calculating circuit, the abnormal value being a calculated speed value larger than that which the user can travel;
• a speed selecting circuit for selecting the first speed when the abnormal value of the first speed is not detected by the abnormal value detecting circuit, and for selecting the second speed when the abnormal value of the first speed is detected by the abnormal value detecting circuit;
• a distance selecting circuit for selecting the first distance when the abnormal value of the first speed is not detected by the abnormal value detecting circuit, and for selecting the second distance when the abnormal value of the first speed is detected by the abnormal value detecting circuit;
• an average speed calculating circuit for calculating an average travel speed of the user by employing the selected one of the first speed and the second speed selected by the speed selecting circuit;
• and
• a distance accumulating circuit for calculating an accumulated distance by employing the selected one of the first distance and the second distance selected by the distance selecting circuit.