Winter-sport device such as a ski, snow-board or runner element with an attached speedometer device for accurate and reliable speed determination by use of the Doppler effect to determine speed from a frequency shift

摘要

Device such as a ski (2, 3) has an emitter that sends microwave radiation into the sub-surface of the ice or snow and a frequency sensitive receiver (9) that detects the reflected wave. Independent claims are made for (1) a speedometer (2) a measurement method based on the Doppler effect for determination of speed of travel of a winter-sport device