The phased-array Doppler log has several advantages, such as small size of array and no need of compensation for sound velocity.
相控阵多普勒计程仪具有基阵体积小,且无需迸行声速补偿等优点。
Doppler log is a precise instrument, which is used to measure ship velocity and calculate its voyage on the theory of Doppler Effect of sound wave in water.