Nexus 2 USBL, 2780 Transceiver

Directional transceiver for high accuracy subsea positioning

Able to determine the positions of up to 16 dynamic subsea targets simultaneously, Nexus 2 is ideal for many deep or shallow water applications where multiple assets are to be tracked. These operations can include UXO surveys utilising several magnetometers or sidescan sonars, diving operations, and for use at offshore worksites where several vehicles may be in use concurrently. The long-range capability and exceptional accuracy specifications make Nexus 2 particularly effective for long layback

applied acoustics

Great Yarmouth, GB

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Description

The Nexus 2 is the second generation of Easytrak digital USBL systems designed as a highly advanced positioning and tracking system that is quick to deploy and straightforward to operate. Featuring aae Sigma 2 acoustic protocols, the Nexus 2’s digital spread spectrum transmissions provide a secure acoustic link with very low susceptibility to interference, enabling precise and reliable positioning over an extended operational range.

When coupled with 1100, 1130, 1160 and 1150 MF Series positioning beacons, Nexus 2 provides Multi-Fire common interrogate and MiQ data telemetry functionality.

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Specifications

Transponders: Dimensions {mm}

74 x 395

Dry weight {kg}

3

Depth rating {m}

1500

Additional functions

Remote transponder option. Depth sensors. Modem. Omni-directional transponder type 1119 specification quoted. Directional transponders also available.

Physical properties of transducer head: Diameter [mm]

200

Height [m]

0.432

Min. external power [Voltage]

90

Max. external power [Voltage]

240

Max power consumption [W]

250

System Parameters: Frequency {kHz}

18-32

Spread spectrum technology

Y

Min. operation range {m}

1

Max. operation range {m}

3000

Operation beam angle {deg}

150

Focussed beam forming

N

Number of active elements

8

Number of transponder channels

16

Multi user functionality

Y

LBL-functionality

N

Horizontal accuracy (in % of the water depth)

0.1

Vertical accuracy (in % of the water depth)

0.1

Angle accuracy (degr) @ 20 dB

0.07

Motion compensation: Motion sensors compatible to the system:

Internal AHRS + external options Internal depth sensor

Interfaces: Compatible hardware

Serial and Ethernet

Compatible software

Nexus 2

Real-time access procedure

Embedded Windows 7

Inertial interfacing

Y

Speed of sound: Ray tracing

N

Real-time integration of SV-profile

Y

Deployment: Inside deployment pole available

Y

Diam gate valve {mm}

300

Outside deployment pole available

Y

Recommended distance below keel {m}

2.5

Mounting and deployment: Mounting

Hull mounted & Portable

Retractable

Y

Used Sonar Methods: Type of system

USBL

More information: Distinguishable features

High accuracy/repeatability. Bi-directional Sigma 2 spread spectrum. Integrated 'Easycal 2', USBL calibration tool. Graphical overlay. Spec describes directional Transceiver Type 2780. Omni-directional transceiver option also available..