UT 3000 MASQ - Elac-Nautik

UT 3000 MASQ
Through Water Communication
MASQ was developed to provide the next generation reliable Through Water Communication (TWC)
system capable of operating at speed and depth. MASQ stands for a very confi dential and secure
way of signalling.
L-3 Communications Nautronix Limited (L-3 Nautronix, formerly
Nautronix) have been developing through water acoustic systems for
over 20 years and delivered systems into many navies including the
RAN, the RN and the USN. L-3 ELAC Nautik now builds the latest generation
of underwater communication systems, the digital UT 3000.
For decades L-3 ELAC Nautik is the world’s most respected manufacturer
for underwater communication systems. The latest generation,
the UT 3000 was fi rst delivered in 2008 and set new standards for
digital underwater communication.
The two companies have joined together to combine their latest technologies:
signalling from L-3 Nautronix called MASQ, and L-3 ELAC
Nautik's digital underwater communications system UT 3000.
This next generation signalling scheme was developed due to both
internal and external requirements to develop reliable systems with
increased baud rate as compared to previous systems.
In order to meet these requirements the signalling and encoding has
been changed and software developed that is capable of being ported
and operated on a number of hardware platforms.
Visualization of digital underwater communication
MASQ can be provided as an upgrade for existing UT 3000 owners or
be included in new systems. Future plans have the technology being
implemented in an underwater modem product.
Underwater Communication System UT 3000

DISCOVER THE UNKNOWN
Specifications and Technical Data
UT 3000 MASQ at a Glance
Technical Data UT 3000
Bit rate
Doppler tolerance / tracking
Frequency range
Multipath rejection
Transmit power at
carrier frequency
WB 54
WB 55
WB 70
50-1,000 bps*
± 45 knots
7,500-19,000 Hz
High level - Ideal symbol length is set
automatically (depending on MASQ
Preset selected)
Dependent on transducer
188 dB
197 dB
203 dB
SNR of detection -15 dB for MASQ 50
+3 dB for MASQ 1,000
Included error correction
Excellent burst noise rejection
Multiple receiver channels With the WB 54, WB 55 or WB 70
transducer, spatial diversity
techniques supported
UT 3000 transducers WB 54, WB 55 and WB 70
MASQ Predicted Performance*
Preset Bit Rate (bps) Carrier Freq. (Hz) Transmission Bandwidth (Hz)
Range predictions are based on spherical spreading and absorption
models, incorporating surface noise and biological (short transients)
in the shallow water case. These predictions have been validated by
actual measurements made in close to ideal deep water conditions
and very rough shallow water conditions.
Range for 186 db SL
(deep, calm conditions)
MASQ 50 50 9,500 7,500-11,500 > 30 km > 35 km
MASQ 100 100 9,500 7,500-11,500 > 30 km > 30 km
MASQ 500 500 10,000 7,000-13,000 21 km 30 km
MASQ 1,000 1,000 12,750 6,500-19,000 12 km 17 km
*Data rate fi gures quoted are raw data rate (excluding all protocol overheads which are typically 20%). Actual transmission bandwidth
is also dependent on transmission hardware including matching network and transducer. Restrictions to actual bandwidth – e.g. due to
fi ltering - will reduce Signal to Noise Ratio (SNR) and if output power is kept constant, reduce range performance.
Range for 200 db SL
(deep, calm conditions)
L-3 Communications ELAC Nautik GmbH | Neufeldtstrasse 10 | 24118 Kiel | Germany | Tel. +49 (0)431-883 0 | Fax +49 (0)431-883 496
elac.marketing@L-3com.com | www.elac-nautik.de | Design changes and errors reserved. Rev. A 01/11/2011