Doppler velometer

Abstract

The invention provides a Doppler velometer. The Doppler velometer comprises a sound wave transceiver, a frequency analyzer and an arithmetic device. In each measuring process, the sound wave transceiver sends sound wave signals twice to a target to be measured, and the second-time sound wave signals are sent after the first-time sound wave signals are returned; the frequency analyzer analyzes the frequencies of the returned signals corresponding to the two-time sound wave signals; the arithmetic device calculates absolute velocity of the target to be measured according to the time interval for sending the sound wave signals twice, the round-trip time of the sound wave signals each time, and the frequencies of the returned signals corresponding to the sound wave signals at any one time. The Doppler velometer can measure the absolute velocity of the target to be measured in a moving state, so that the Doppler velometer is suitable for measurement in various conditions.

Description

technical field [0001] The invention relates to the field of electronic equipment, in particular to an electronic speedometer. Background technique [0002] The current velocimeters mainly include optical velocimeters and sonic velocimeters. Both of these two velocimeters are relative velocimeters, that is, they can only use the speed measuring head as a reference to detect the speed of the measured object relative to the probe head. The principle Yes: The probe continuously sends signals to the measured object, and the speed of the measured object relative to the probe can be calculated according to the round-trip time difference between the two signals and the propagation speed of the signal. However, the current speedometer cannot calculate Therefore, in some special cases, it cannot be used to detect the absolute speed of a moving target. For example, when a police car chases a speeding vehicle, the speed measuring device in the police car cannot directly measure the act...

AI Technical Summary

Problems solved by technology

[0002] The current velocimeters mainly include optical velocimeters and sonic velocimeters. Both of these two velocimeters are relative velocimeters, that is, they can only use the speed measuring head as a reference to detect the speed of the measured object relative to the probe head. The principle Yes: the probe continuously sends signals to the measured object, and the speed of the measured object relative to the probe can be calculated according to the round-trip time difference between the two signals and the propagation speed of the signal. However, the current speedometer cannot calculate Therefore, in some special cases, it cannot be used to detect the absolute speed of a moving target. For example, when a police car is chasing a speeding vehicle, the speed measuring device in the police car cannot directly measure the actual speed of the speeding vehicle.