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1-2
CHAPTER 1 Overview
1.2
System Components
The main components of the Series 4000 Sonar System are the towfish and the
topside system. The towfish is the underwater component and is towed with an
armored coaxial tow cable up to 6000 meters in length. The topside system
provides the power source for the towfish and receives, stores and processes data
acquired by the towfish. The towfish connects to the topside system using an
optionally supplied winch with slip rings and an armored coaxial tow cable. A
terminated, light weight 100-meter deck cable is also included for connecting to
the winch or for connecting directly to the towfish for testing. The topside system
is composed of two separate main components:
• Transceiver and Processing Unit (TPU)
• SonarPro Workstation
In addition, optional topside system components are available:
• Splashproof Transceiver and Processing Unit (SP-III TPU)
• Laptop computer
• 50-meter lightweight coaxial tow cable (included with SP-III TPU)
Additional optional components that can be installed on the towfish include a
K-Wing I or K-Wing II Depressor, a power fail emergency pinger interface,
responder interface, a magnetometer interface, and other equipment.
1.2.1
The towfish, which is shown in Figure 1-1, consists of a negatively buoyant
stainless steel housing with attached port and starboard sonar transducers, a nose
cone, and a tail cone with stabilizing fins. The housing contains the sonar
electronics, a downlink demultiplexer for control signals and an uplink multiplexer
for sonar and sensor data. An External Sensor Pack (ESP) inside the tail cone
contains a compass which provides heading, pitch and roll; a pressure transducer
which provides water pressure for calculating depth; and a temperature sensor
which provides water temperature. The downlink control signals and the uplink
sonar and sensor data are multiplexed onto a single conductor coaxial tow cable.
An electro-mechanical termination is provided on the towfish end of the tow cable,
where a shackle provides a strong, reliable mechanical termination to the towfish
tow bracket, and an underwater connector connects to a jumper cable on the
towfish. Four carrying handles, two forward and two aft, are included for lifting
and transporting the towfish, and an installed safety cable minimizes the chances
of losing the towfish should it collide with an obstruction.
Series 4000 Sonar System Operations and Maintenance Manual
Towfish
P/N 11210094, Rev. 01
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