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Home – applied acoustics – Easytrak USBL Systems – Easytrak Nexus USBL, Model 2691
Easytrak USBL Systems

Easytrak Nexus USBL, Model 2691

Easytrak Nexus 2 is the next generation of advanced USBL positioning and tracking system that incorporates Sigma 2 Spread Spectrum technology to provide a secure acoustic link. By incorporating aae Sigma 2 technology the wide bandwidth transmissions reduce its susceptibility to interference and enables precise, reliable positioning over an extended operational range.

The MIL grade Easytrak Nexus 2 determines the position of dynamic subsea targets by transmitting and receiving acoustic signals between submerged transceivers and target beacons. Positions can be geographically referenced with chart overlays and internally logged for a complete solution.

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Section
Key Features
Applications
Technical Specification
Compatible Products
Compatible Products
Key Features Applications Technical Specification
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Key Features

  • Bi-directional Sigma 2 Spread Spectrum acoustics
  • Improved positioning accuracy and stability
  • Multi Fire optimised beacon refresh rate
  • MIL Specification EMC
  • MIL Specification Environmental
  • 16 target tracking
  • Geographical navigation overlays
  • EasyCal 2 embedded calibration tool with AutoCal Wizard
  • Data telemetry options

Applications

  • Mine countermeasures (MCM)
  • Underhull inspection
  • Diver Tracking
  • AUV/ ROV tracking

Technical Specification

Easytrak Nexus Console, EZT-2691

Code: EZT-2691 is under U.K. Export Control ML9a1

Dimensions
19” Rack mount. 3U 483 x 132.5 x 441.5mm
Weight
10.0kg
Mounting
Chambrelan D466VD-450 Slide
Power requirements
210 – 240 VACRMS. 2ARMS,(Following boot.) 7A Max Peak to Peak Inrush upon transceiver initialisation. Power on system boot.
Connection to transceiver
Rear-panel connector for transceiver
Built-in PC
Intel I5 running embedded Windows 7 Solid state hard disk
Front panel indicators
LED indicators for power and serial status
Serial Communications
5 x RS-232. Selectable Baud rates
Data Output
AAE format V1 and V2, TP-II2EC, TP-EC W/PR, Simrad 300P, Simrad 309, Simrad $PSIMSSB, Pseudo $GPRMC, NMEA $GPGGA, NMEA $GPVTG, NMEA $GPTLL,Pseudo $GPGGA, KLEIN 3000 (Quick set) Multiple outputs available
Compass Input
TCM-2.X, SGB-HTDS, SGB-HTDt, $HEHDT, $HDHDM, $HDHDT, $HDHDG
VRU Input
TCM-2.X, $HCXDR , TSS1
GPS / DGPS Input
NMEA; GLL, GGA, RMC
Target Heading Input
NMEA HDM, HDT, HDG, PNI TCM2
Target Depth Input
NMEA DBT, DBK, DBS, DPT, AAE
Time in
GPS Time synch
Responder Output
Pulse: Positive 12V pulse 5ms long
USB
3 ports available
Ethernet
Rear panel standard RJ45 jack
Audio
Audible activity indicator

Transceiver, Type EZT-2686 And EZT-2780 Specifications

Factory calibrated multi-element transceiver head complete with integral AHRS, depth sensor and
temperature sensor.

Material
Stainless steel
Weight in air/water
2686 16kg/11kg
2780 21kg/15kg
Dimensions
2686 152mm Ø x 432mm
2780 200mm Ø x 432mm
Temperature
Operating: -10° to +40°C Storage: -20° to +50°C
Depth rating
30m
Electrical supply
48Vdc
Depth sensor (Pressure Sensor)
5 bar, accuracy 0.25% between -10° to +40° C
Temperature sensor
1° resolution between -10° and +40° C
Frequency band (MF)
18 – 32 kHz
Tracking beam pattern
2686: 180° 2780: 150°
Transmitter
Variable, typical max 192dB re 1µPa at 1m
Compatible transponders
AAE Sigma 1, Sigma 2 Digital Spread Spectrum and AAE Tone channels. AAE V-NAV channels. HPR 400 channels 1100, 1000, 1200A, 1300A Series Beacons, Digital Depth Transponders, AAE Release and Telemetry Beacons.
Interrogation rate
>2Hz refresh rate. Internally set or external key
System
Externally assessed for immunity and emissions; conforms to 89/336/EEC. RoHS compliant
Cable length
Max 150m

Transceiver Performance

Accuracy is based on the correct speed of sound being entered, no ray bending and an acceptable S/N ratio

Position repeatability, calibrated and measured with SNR > 20dB rel.1µPa in a controlled test environment

Transceiver
Console
Beam pattern
Acoustic precision degrees
Acoustic % slant range
Internal AHRS precision
Acoustic + internal AHRS %
Acoustic + external AHRS %
Max range
Range resolution
UK Export control
EZT-2686-N
EZT-2692
180°
0.25° DRMS
0.45%
0.5°
1.49%
0.45%
995m
0.01m
No
EZT-2686-C
EZT-2692
180°
0.25° DRMS
0.45%
0.5°
1.49%
0.45%
2000m
0.01m
Yes
EZT-2780-N
EZT-2692
150°
0.07° DRMS
0.12%
0.5°
1.17%
0.12%
995m
0.01m
No
EZT-2780-C
EZT-2692
150°
0.07° DRMS
0.12%
0.5°
1.17%
0.12%
3000m
0.01m
Yes

Transceiver Cable, Code: EZT-MC-50

Code: EZT-MC-50 is under U.K. Export Control ML9a1

Diameter
12.8 mm nominal
Colour
Yellow
Length
50 metre standard length
Connectors
Supplied
SWL
20 kg. Allows transducer to be deployed from cable

Electro Magnetic Immunity (EMI)

MIL STD 461D tests: CE101, CE102, RE101, RE102, CS101, CS114, RS101, RS103 to an upper limit of 1GHz.

Environmental Specification

High Temp Test (MIL-STD-810F. METHOD 501.4)
Storage
43°C
Operational
30°C
Low Temp Test (MIL-STD-810F. METHOD 502.4)
Storage
–20°C
Operational
0°C
Humidity Test (MIL-STD-810F. METHOD 507.4)

Vibration DEF STAN 00-35 Part 3: Issue 4
M1: General Purpose Vibration Test: Deployed or installed in surface ships: Sine sweep
M1: General Purpose Vibration Test: Deployed or installed in surface ships: Sine dwell

Test Type
Region
Amplitude (mm pk)
Frequency (Hz)
Duration (mins)
Sine Sweep
Upper deck,
Protected
Compartment and Hull
0.125
5 to 33
60
Sine Dwell
All
1.250
0.300
0.125
14
23
33
20
20
20

Shock DEF STAN 00-35 Part 3: Issue 4
M7: Shock Testing for Warship Equipment & Armament Stores: Classical Shock Pulse
NCUE – Classical Shock Pulse

Vertical
Lateral
Longitudinal
Pulse Shape
Half Sine
Pulse Width
10ms
Acceleration
45g
25g
25g
Duration
1 shock in each direction of each orientation (6 in total)

See operational specification for testing methodology.

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