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4200 SIDE SCAN SONAR SYSTEM USER HARDWARE MANUAL 0004842_REV_N
2.2.4 Power Amplifier
There are four identical Power Amplifier boards, one for each of the port high (SSH) and low (SSL)
frequency transmit signals, and one for each of the starboard high and low frequency transmit signals.
+48 VDC is input on J2 from the Power Distribution board, and the amplified outputs are output on J3 to
the T/R Switchboard to drive the transducer arrays. On/off control signals, along with the low level
transmit signals, are input on J1 from the Sonar Interface board.
2.2.5 Central Processing Unit
The Central Processing Unit (CPU) board runs an embedded version of the Microsoft Windows XP
operating system and includes a 4 GB flash memory with C and D partitions. The C partition contains the
operating system, and the D partition contains the sonar application software. The CPU board inputs
downlink commands from the topside processor over the Ethernet connection on J1 with the ADSL
Modem board. At the same time, it outputs the uplink sonar data to the topside processor over the same
connection. In addition to these functions, the CPU provides the chirp matched filter processing, power
up diagnostic self-tests, and pointing device and keyboard inputs for factory tests. The COM1 serial port
of the CPU board interfaces with an optional magnetometer, and the COM3 interfaces with the compass.
+12 VDC power is input from the Power Distribution board.
2.2.6 Sonar Interface
The Sonar Interface board converts the digital chirp high and low frequency transmit signals for the
100/400-Khz frequency systems into corresponding, low-level analog signals. These signals are output on
J9 to the Power Amplifier boards. In addition, signals from an optional pressure sensor and an internal
temperature sensor are input on J10, the FSK responder trigger signals are input on J4, and the digitized
received sonar signals from the Side Scan board are input on J7. Test points and indicators for the transmit
signals and IDE interface logic for the Side Scan board are also included. +5, +12, and -12 VDC power is
input on J5 from the Power Distribution board.
2.2.7 DDC
The DDC board takes the place of the Side Scan board for the 300/600 and 300/900-kHz systems.
2.2.8 Side Scan Board
The Side Scan board provides analog-to-digital conversion of the received sonar signals, which are input
on J1 from the T/R Switchboard. The digitized signals are output on J2 to the Sonar Interface board.
Indicators on the Side Scan board illuminate when signals are being received.
2.2.9 Compass
The Compass board provides heading, pitch, and roll outputs to the USB port of the CPU board.
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