APPARATUS FOR DETERMINING THE SPEED OF TRAVEL AND DISTANCE TRAVELLED BY A USER

摘要

Apparatus for determining the speed of travel and the distance travelled by a user comprises a GPS receiver (2) for calculating the position and speed of movement of the user and a sensor (6) which detects movement of the user and generates a movement signal. A processor receives a position/speed signal from the receiver (2) and uses it to calculate the distance travelled by the user from a given position, and uses the movement signal to verify that the calculated distance travelled and the measured speed of movement of the user correspond to actual movement of the user. In a second embodiment, first (32) and second (34) transponders are provided for attachment to the user's limbs, typically the user's ankles, and transmit signals to one another. The transponders (32, 34) transmit an accurately timed sequence of signals to one another, and variations in the time of flight of the signals are processed to determine the speed of movement and distance travelled by the user.