Initial issue
Issue Date 25/06/2010
User Manual: 8142/8182 Transceivers
02 Technical and Functional
Page
7of 10
2
SYSTEM DESCRIPTION
The equipment used in the L/USBL system is as follows (
Figure 3: Type 8142 USBL / LUSBL System
):
a)
Optional output to DP System
b) VRU
c) Gyro
compass
d) DGPS
e) Monitor/Keypad
unit
f) Acoustic
Transponder
g) Acoustic
Transceiver.
The equipment used in the type 8182 transceiver system is as follows (
):
a) Monitor/Keypad
unit
b) Acoustic
Transponder
c) Acoustic
Transceiver.
2.1
TYPE 8142 TRANSCEIVER
The difference between the USBL and the LUSBL systems is as follows:
a)
The USBL system uses only one transponder on the seabed.
b)
The LUSBL uses multiple transponders.
c)
The USBL system uses only one transponder on an ROV or diver
d)
The USBL system is not as accurate as the LUSBL system.
e)
The LUSBL gathers a larger volume of data this enables a greater degree of statistical
filtering.
The system is controlled by the DFE. The operator uses the Monitor/Keypad unit to input data and run
the computer software. The processor commands the transceiver to send acoustic signals to the
transponder(s) and then interprets the responses received by the transceiver.
The processor receives reference information from the VRU, DGPS and Gyro Compass and produces
outputs to the DP system. The system measures the range and direction of a transponder relative to
the known location and orientation of the transceiver housing:
The transponder range is calculated by measuring the elapsed time between the interrogation signal
and the detection of the transponder reply.
The transponder bearing is calculated by using advanced signal processing on the received acoustic
data on multiple elements.
Summary of Contents for 8142-000-01
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