According to active underwater measuring location principle,the ultrasonic transducer is launched ultrasonic for simulating submarine terrain.Because the ultrasonic echo signal and reference signal have strongly inter-related characteristics,maximum relations to the sampling location would be gained.Utrasonic propagation time is obtained.Experimental results show that cross-correlation method for measuring seabed topography has highly accuracy.It will be able to meet the underwater Micro-topography measurem...