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Multiplexer board.
the transducer sub-array channels along with the signals from the sensors,
encodes the data, and transmits a high baud rate digital data stream to the
SP-II TPU via the tow cable. The Multiplexer board also receives the trigger
signal and command messages which instruct the Transceiver board to fire the
arrays and configure aspects of towfish operation. The Multiplexer board also
acts as a motherboard for the other boards providing the connections and
distributing power.A full duplex hybrid allows data transmission up the cable
while simultaneously receiving the FSK trigger signals and power. The
downlink signals are input to FSK demodulators, and the baseband outputs are
routed to the Transceiver board, indicating when to fire the main array, and to a
micro controller that handles towfish configuration.
Power Supply board.
to the towfish electronics.
Heading, Pitch and Roll module.
outputs towfish heading, pitch and roll.
Pressure sensor.
of towfish depth.
1.4.3
Splashproof-II Transceiver and Processing Unit
The SP-II TPU provides signal processing along with the system control and data
telemetry functions. The SP-II TPU is composed of four circuit boards: a
Computer Data Interface board (CDI), a CPU board, a Power Integration board,
and a Panel Interconnect board. In addition, a 12 VDC power supply is included to
power the boards. All of these components are shown in Figure 1-5, and a block
diagram of the SP-II TPU electronics is shown in Figure 1-6.
Computer Data Interface (CDI) board.
and power interface between the towfish and the CPU. DC power and
telemetry commands are transported down to the towfish, while sonar and
sensor data transported up from the towfish are decoded and passed along to
the CPU.
CPU board.
The CPU board functions as the command and data interface
between the laptop computer running SonarPro and the tow fish. It executes a
real-time data server which outputs sonar and sensor data to and receives
commands from an external client, such as SonarPro.
Power Integration board.
the towfish from either a 12 VDC or a 88–264 VAC, 47–63 Hz source. It also
provides filtering, reverse polarity protection, and fusing of the input power.
Panel Interconnect board.
mechanical cable interface to the various external connectors in the system.
Functional Description
The Multiplexer board digitizes the signals from each of
The Power Supply board provides low voltage power
The heading, pitch and roll module
The pressure sensor outputs water pressure for calculation
The CDI board functions as a data
The Power Integration board provides 200 VDC to
The Panel Interconnect board facilitates a simple
1-9
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