Subsea Navigation, Acoustic Positioning, Underwater Communications

Products > AvTrak 2

Overview
Key Features
Technical Specifications
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Related Products
- Fusion USBL
- Fusion LBL
AvTrak 2
Overview
AvTrak 2 is a second generation acoustic navigation and communications instrument designed to form part of an integrated AUV navigation system. It combines the functions of transponder, transceiver and telemetry link in one low power device that has been designed to meet the requirements of a variety of mission scenarios and vehicle types.

The unit can operate in Wideband or tone mode and with a variety of systems and transponders. It is also fully compatible with Sonardyne’s family of LBL and USBL survey quality navigation systems.

AvTrak has a comprehensive yet easy to use command language that allows the AUV to undertake simultaneous LBL ranging, USBL tracking via a surface vessel and robust and high speed telemetry both for AUV to vessel and for AUV to AUV communications. This capability provides the AUV designer with good quality absolute position reference data to constrain the drift in his inertial navigation system.

The instrument is available in a variety of configurations including 3,000, 5,000 and 7,000 metre depth rated housings, screened chassis option for mounting within the main AUV pressure vessel, omni and directional transducers for shallow and deep operations respectively, and integral or remote acoustic transducer options for ease of installation. 

An internal ‘watchdog’ option monitors AUV comms activity and can switch the unit into transponder mode for emergency relocation. This is supported by an internal back up battery and digital I/O for emergency ballast jettison.

Sonardyne has extensively modelled the performance of AvTrak 2 to achieve an optimum design. This capability is available to customers to assist in arriving at the best possible configuration for their AUV.  Advice on transducer installation and its impact on system performance is also available.
Key Features
Incorporates Sonardyne's latest Wideband TechnologySonardyne Wideband
Technology provides the highest accuracy and therefore the lowest risk for all subsea acoustic positioning tasks, regardless of water depth.
Compatible with Fusion USBL for surface vessel combined telemetry and positioning
Combined telemetry and positioning
Supports AUV to AUV ranging and telemetry
Two telemetry modes: Robust and High Data Rate
Designed for Doppler immunity
Emergency relocation modes
Digital I/O, e.g. for emergency ballast control
Extremely low power consumption
Surface unit available for AUV ranging and communications

Technical Specifications

System Features Type 8065
Frequency Band MF (19-36kHz)
Source Level (re 1 µPa @ 1m) Omni
Directional
188 dB
193 dB
Range Measurement
Repeatability / Accuracy
Wideband
Tone
1cm / 3cm
10cm / 30cm
Telemetry Robust Wideband SMS
HDRL (High Data Rate Link)
1,500 baud
Up to 15,000 baud
Transponder Compatibility
(* = Wideband & Tone Operation)
  Wideband Sub-Mini*, Compatt 5*, SSM,    Compatt 4, HiPAP Series
Pinger Detection (Wideband Only), Max No of Pingers   4
Digital Input / Output   4 plus event sync
Internal Sensors   Pressure and Temperature
Communications Interface   RS232 / 485 (9,600 – 38,400 baud), event sync

Main Housing Features Type 8065
Dimensions
3,000 Metre Housing
5,000m Metre Housing
7,000mMetre Housing
499mm x 93mm
518mm x 93mm
518mm x 93mm
Weights in Air / Water
3,000 Metre Housing
5,000m Metre Housing
7,000mMetre Housing
5.1kg / 2.2kg
7kg / 3.6kg
7kg / 3.6kg
Voltage   24-50 Volts
Power Listening (transponder mode)
Quiescent
Peak (during transmission)
25mW
<2W (<1W option)
<50W
Emergency Internal Battery Pack Listening
Continuous 4 sec interrogation
30 days
Approx 2 days

Remote Transducer Features Type 8065
Transducer   Omni or Directional
Dimensions 3,000 Metre Housing
224mm x 93mm
Weights in Air / Water 3,000 Metre Housing
2.5kg / 1.1kg

 

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