Pulse repetition rates were 0.25, 0.5 and 1.0 sec.
All data are digital, merged with navigation and archived on optical disc.
The theoretical resolution of the system is 11 cm in the vertical and 5 to 30 meters in 30 to 1000 meters water depth. Owing to printer and monitor resolution, the practical resolution is on the order of 0.5 meters. The system performed well with no maintenance required throughout the course of the survey. The chirp system produces very high resolution subbottom profiles from a precise, computer generated, swept frequency output whose reflected returns are match filtered to compress the pulse and suppress noise. The system performed poorly throughout the survey, owing to noise inherent to our specific chirp sonar and to noise generated by the winch.