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

摘要

A portable type distance/speed meter is designed for measuring a travel distance and a travel speed when a user walks, or runs, while realizing a correct average speed calculation in response to GPS electromagnetic waves receiving conditions. The portable type distance/speed meter is arranged by: a GPS (Global Positioning System) receiver for receiving GPS electromagnetic waves transmitted from GPS satellites to acquire positioning data from the received GPS electromagnetic waves; first distance calculating means for calculating a travel distance of a user as a first distance based upon a difference between positional information contained in the positioning data which are acquired at 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; average speed calculating means for calculating an average travel speed of, the user based upon the first speed calculated by the first speed calculating means in the case that the abnormal value of the first speed is not 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 in the case that the abnormal value of the first speed is not detected by the abnormal value detecting means.