HAIL
DATA SHEET |
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Hydro Acoustic Information Link
HydroAcoustic Information Link (HAIL) has been
developed by L-3 Nautronix to provide reliable
Through-Water Communication (TWC) and
Ranging for undersea platforms operating at speed
and depth.
Underwater Email or Short Message Service
(SMS) are capabilities that HAIL makes a reality
today.
The priority of HAIL has been to achieve
communication reliability, doppler tolerance and
ability to operate below the background noise.
Hence signal bandwidth is used to provide receiver
processing gain rather than high data rates.
HAIL is based on an adaptation of a Direct
Sequence Spread Spectrum (DSSS) signalling
technique which provides a number of advantages
over traditional modulation techniques:
- Low Spectral Density Able to operate discretely and reliably below the ambient noise.
- Resistance to Jamming Wide bandwidth
signal resistant to interference from
discrete noise sources.
- Code Diversity Enables selective
addressing of multiple systems.
- Message Privacy Unique spreading codes
allocated to specific user groups.
- DSSS Signal Processing Reduces the
impact of adverse underwater channel
effects such as time varying multi-path
interference and frequency selective fading
on signal integrity.
- Continuous Doppler Tracking Able to
operate reliably between platforms with
high and changing relative motions.
- Platform Ranging HAIL signals can also
be used to calculate range between
platforms, using code synchronisation and
subsequent high precision one way time of
flight measurements.
| KEY FEATURES |
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Reliable Through-Water Communications at speed and
depth |
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Optimised for Short Message Service and data packet
telemetry |
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Advanced Spread Spectrum Signalling |
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Doppler tolerant |
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Programmable signal carrier frequency and bandwidth |
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One way Time Of Flight ranging |
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Resistant to adverse underwater channel effects |
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Choice of PC or DSP based systems to suit application |
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