DOPPLER SPEEDOMETER AND SPEED MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a Doppler speedometer in a simple configuration capable of accurately measuring an object speed in a measurement environment with a low signal-to-noise ratio.SOLUTION: A Doppler speedometer comprises: a first Doppler speedometer 12 outputting a first speed information that indicates a speed including noise obtained by measuring a speed by a Doppler method using frequency information; a speed measurement range determination unit 13 determining a speed measurement range necessary for measuring an object speed based on a speed and noise indicated by the first speed information outputted from the first Doppler speedometer 12; and a second Doppler speedometer 14 measuring an object speed by a Doppler method using phase difference information, the second Doppler speedometer measuring the object speed at a pulse interval or a frequency interval appropriate for the speed measurement range determined by the speed measurement range determination unit 13.SELECTED DRAWING: Figure 1