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CHAPTER 1: O
The Series 3900 Sonar System is a dual frequency, very high resolution, long
range side scan sonar system, ideally suited for search and recovery missions and
other surveys which require high accuracy in shallow water environments. The
system is lightweight, one-man portable and specially configured for simple setup
and operation from a small boat.
1.1
Equipment
The Series 3900 Sonar System equipment consists of a single beam sonar
instrumented towfish, a splashproof transceiver and processing unit, and a laptop
computer, along with a tow cable and various interconnect cables.
1.1.1
The towfish electronics perform all the sonar data processing prior to digital
transmission to the transceiver and processing unit. This minimizes the system's
susceptibility to externally induced electronic noise. Processing includes transmit/
receive functions, time varied gain (TVG) amplification, digitalization, and
multiplexing of the sonar uplink data. Timing and sonar data are bidirectionally
multiplexed on a single conductor coaxial cable. Use of a low noise preamplifier
design ensures maximum range performance. The ability to operate with a
fiber-optic cable is available as an option for very long cable (deep tow) operations
or installations requiring electrical isolation in severe noise environments.
An electro-mechanical termination is provided on the towfish end of the tow cable
for connection to the towfish. A tow shackle provides a strong, reliable,
mechanical termination to the towfish tow bracket. An underwater connector on a
pigtail connects the tow cable electrically to an underwater jumper cable on the
towfish.
1.1.2
The transceiver and processing unit is a Splashproof-II TPU (SP-II TPU) which
contains the electronics for processing the sonar data and powering and
communicating with the towfish.
VERVIEW
Single Beam Sonar Instrumented Towfish
Splashproof-II Transceiver and Processing
Unit (SP-II TPU)
1-1
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