A Study for Optimum Survey Method of Underwater Structure Using the Dual Sonar Sensor

Table 2

Overlapping area occurs.

Classification	Distance to the structure	Frequency	Swath width	Towfish angle	Resolution grade
Towfish (①)	1.50 m	1250 kHz	16 m	R 70°	A
Towfish (②)	3.80 m	1250 kHz	16 m	L 20°
(a) Concept of Case  1 (overlapping area)			(b) Case  1 sonar data