Patent ID: 6388613
Filing Date: 2002-05-14
Classification: G01C,G01P,G01S

Abstract:
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; timer means for measuring travel time of the user over the first distance; 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 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; average speed calculating means for calculating an average travel speed of the user based upon first speed values calculated by the first speed calculating means excluding abnormal values of the first speed detected by the abnormal value detecting means; and distance accumulating means for accumulating the first distance calculated by the first distance calculating means 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 means.