2-7
2.1.2 Housing
The 6205s shells are thermoformed polycarbonate (PC). The internal frame is made of electropolished
316 stainless-steel and acetal homopolymer (Delrin). The housing supplies a streamlined body for efficient
underwater maneuvers rated up to 12 knots while protecting the SVS, arrays, and deck cable connections.
NOTE: Although the 6205s can handle transit up to 12 knots, survey
speeds should be constrained to 4-5 knots or less. However, EdgeTech
recommends removing the Sonar Head from the water during transit
above 7-8 knots.
2.1.3 Sonar Processor
The 6205s Sonar Processor has a built-in Windows 7 Embedded PC. The main firmware installed on the
embedded PC is called Sonar.exe, which controls the sonar’s hardware and performs specific functions,
such as signal processing and time synchronization of the acquired data.
2.1.4 Sound Velocity Sensor
The 6205s Sonar Head has a flooded section used to house an AML Sound Velocity Sensor (SVS), which
provides a response time of 47 μs, a resolution of 0.001 m/s, and a theoretical accuracy of ±0.025 m/s. A
closer look at the SVS is presented in F
IGURE 2-4.
EdgeTech recommends collecting a sound velocity profile, especially in the area where you collect test
data. The water being operated in likely does not have a uniform sound velocity, and depending on how
drastic the profile is, a depth error as large as 1.6 m has been observed.
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