Velocity measurement by dural time interval pulse-to-pulse coherent Doppler sonar

With high accuracy and resolution Pulse-to-Pulse coherent Doppler sonar is wildly used in both laboratory and field application. However, the occurrence of range and velocity ambiguities brings serious limitations on the more general application of the technique. One method to deal with speed ambiguities is to import a dual pulse repetition interval which can provide acceptable speed ambiguities and requires uncomplicated equipment. The experiments are carried out under the frequency of 200KHz with 40ms and 60ms pulse intervals in a water tank. The results show that this method is efficient and produces high quality velocity data to track the velocity of an object in a limited range in water.