Klein Marine Systems, Inc. HYDROCHART 3500, Руководство по эксплуатации и обслуживанию

Страница: 56 / 86

5-4
CHAPTER 5 Technical Description
HydroChart 3500 Sonar System Operations and Maintenance Manual P/N 11210087, Rev. 03
5.2 Sonar Head Unit
The Sonar Head Unit transmits and receives the sonar signals, processes
them, and outputs the processed sonar and sensor data to the TIU over the
Ethernet 100Base-T connection in the deck cable. The primary active components
of the Sonar Head Unit are the sonar electronics and the two transducer arrays.
Optional MRU, compass and sound velocity sensors can also be included. The
compass and the sound velocity sensor are mounted to the Sonar Head Unit frame.
The MRU is mounted to the electronics chassis.
5.2.1 Sonar Electronics
A block diagram of the Sonar Head Unit electronics is shown in Figure 5-3, and
the electronics chassis is shown in Figure 5-4.
The Sonar Head Unit electronics is composed of the following main components:
Control and Data Interface (CDI) board.
The CDI board, to which is
mounted the Processor board, inputs 30 VDC power from the TIU and
interfaces with the Receiver and Transmitter boards, providing power as well
as command and control and clock outputs to them while receiving and
transferring sonar data to the Processor board. The CDI board also inputs the
1PPS signal from the TIU to synchronize the time tags for the sonar and sensor
data and outputs a trigger pulse to the TIU every ping cycle to flash the
power/transmit indicator. In addition, the CDI board provides the RS-232
serial interface with the TIU for input of NMEA-0183 data from a navigation
device as well as RS-232 serial interfaces for the optional MRU and sound
velocity sensor.
Processor board.
The Processor board, which plugs directly into and is a
functional part of the CDI board, runs an embedded software application and
interfaces with the CDI board to control the sonar and to communicate with the
PC that is connected to the TIU over the Ethernet 100Base-T connection. The
Processor board also provides the Ethernet 100Base-T connection. ASCII
serial commands, such as sonar range, transmit pulse length and other
parameters, are sent from the PC to the Processor board which in turn provides
the command and control signals to the CDI board.
Transmitter board.
The Transmitter board includes two independent
transmitters, each of which outputs a chirp transmit waveform to a transducer
array during each ping cycle in accordance with a trigger signal from the CDI
board. The chirp waveform, frequency sweep and pulse width for each cycle
are generated by the Transmitter board for each transmitter in accordance with
command and control and clock inputs from the CDI board. The Transmitter
board is powered with 30 VDC from the CDI board. It also uses the 30 VDC to
generate the high voltage required to drive the transducer arrays.