Lodestar Surface

Sonardyne UK (Head Office)
T. +44 (0) 1252 872288
F. +44 (0) 1252 876100
E. [email protected]
www.sonardyne.com
Datasheet
Lodestar – Surface AHRS and AAINS
Description
Lodestar is a solid state Attitude and
Heading Reference System (AHRS)
and Acoustically Aided Inertial
Navigation System (AAINS).
The unit comprises 3 high
grade/high reliability, commercially
available Ring Laser Gyros (RLGs)
and 3 linear accelerometers. A
Sonardyne developed gyrocompass
algorithm runs in the background
even when used as an AAINS.
A flexible AC or DC power input has
been incorporated to facilitate
surface vessel applications. With the
battery back up capability supplied,
the unit is able to continue running
the AHRS and AAINS algorithm
during vessel power brown-outs.
The Lodestar AHRS algorithm outputs
precise heading, roll, pitch and
heave estimation in dynamic
conditions without the need for
external aiding inputs or vessel
manoeuvres.
Lodestar is the core component in
any Sonardyne AAINS system. It
directly interfaces to aiding sensors
such as USBL or LBL transceivers, a
DVL, a GNSS receiver, a pressure
sensor and a sound speed sensor
(SSS).
• Single IP66 rated solution for
motion sensor and gyrocompass
and AAINS systems
Applications Include
• 0.01º roll and pitch accuracy
• An optimised USBL system: The
directly coupled precise attitude
data complements the precision of
advanced USBL systems.
•
As a precise position input to DP
systems using AAINS, a USBL
system and one or more seabed
reference beacons for operations
in excess of 2000 m.
• As a positioning system for an
ROV, aided by a combination of
position estimates from a topside
USBL system, vehicle mounted DVL,
pressure, sound speed and LBL
transceiver (subsea option).
• Multi-beam Surveys
Key Features
• 0.04 to 0.1º secant latitude
heading accuracy
(gyrocompassing)
• <5 minute settling time
• 5 cm / 5% heave accuracy
• Fast follow up speed of 500º / sec
• MTBF inertial sensors (RLG and
Accelerometer) > 400,000 hours
• Subsea versions available rated to
1,000, 3,000 and 5,000 metres
• Flexible power input AC or DC
• Transport approved Li-Ion battery
back up as standard
• 8 GB internal memory (expandable
to 32 GB)
• Ethernet interface
• AAINS capability
Sonardyne UK (Head Office)
T. +44 (0) 1252 872288
F. +44 (0) 1252 876100
E. [email protected]
www.sonardyne.com
275mm [10,8"]
Specifications
Lodestar – Surface AHRS and AAINS
284mm [11,2"]
300mm [11,8"]
214mm [8,4"]
Feature
Attitude
Heading
Roll & Pitch
Heave
Physical
Environmental
Digital Output
AAINS
Range
Accuracy
Settle Time
Follow Up Speed
Resolution
Range
Accuracy
Resolution
Range
Accuracy (Real Time)
Bandwidth
Resolution
Size (h×w×d)
Weight
Mechanical Construction
Operating Temperature
Shock Rating Operational
IP Rating
Power Requirement
Back Up Battery Type / Life
Data Storage
Number of Digital Ports / Protocol
Other Ports
Navigation Error – scenario/aiding dependent
Navigation Error (Free Inertial)
Maximum Acceleration
Specifications subject to change without notice - 02/2015
Type 8084-000-0000
0-360°
0.04 to 0.1º secant latitude
<5 minutes
500º / second
0.01º
±180º (No physical limit)
0.01º
0.01º
±99 m
5 cm or 5% (Whichever the greater)
User selectable
0.01 m
276 mm × 214 mm × 297 mm
13 kg
Aluminium, Powder Coated
-10°C to +55°C
22 g, 11 ms half sine
IP66
110 / 230 V AC, 60 / 50 Hz or 24 / 48 V DC, 15 W
nominal, 35 W max
Li-Ion / 2 hours
8GB internal memory (expandable to 32GB)
5 x Digital Ports / RS232 or RS485
1 x Ethernet
Typically 10 m, 4 minutes after loss of aiding
10.0 g