Lodestar Subsea 300 AHRS/SPRINT

Sonardyne UK (Head Office)
T. +44 (0) 1252 872288
F. +44 (0) 1252 876100
E. [email protected]
www.sonardyne.com
Datasheet
Lodestar 300 Subsea AHRS / SPRINT 300 Subsea AAINS
Description
Lodestar 300 is a combined solid
state Attitude and Heading Reference
System (AHRS) and optional SPRINT
Acoustically Aided Inertial
Navigation System [AAINS].
The unit is comprised of three high
grade, high reliability, commercially
available, Ring Laser Gyros (RLG)
and accelerometers. The sensors are
also the standard for commercial
aviation with a proven 15+ year
track record.
Lodestar AHRS requires no external
aiding and can settle in <15 minutes
or less in dynamic conditions.
SPRINT INS adds advanced Aided
Inertial Navigation that runs
concurrently with the Lodestar AHRS
algorithm.
This dual algorithm capability is
unique in the market and allows for
dual use from one inertial instrument,
e.g. Lodestar AHRS for ROV, SPRINT
INS for Survey.
On-board data storage and backup
battery functionality ensures
continued operation and no data-loss
even if communications or external
power is lost.
SPRINT INS interfaces to aiding
sensors such as USBL, a DVL,
pressure sensor and sound speed.
Power-pass through to aiding sensors
is supported to ease integration.
SPRINT INS can be operated without
external time synchronisation and
aided with manual positions and DVL
for relative navigation.
Lodestar and SPRINT have a proven
track record spanning 10 years in
the field in diverse applications from
vehicle gyrocompass to demanding
applications such as ROV guidance
and mid water station keeping.
The instrument is available in 4,000
and 6,000 metre depth ratings and
is one of the smallest form factor
subsea inertial instruments available.
Applications Include
• ROV gyrocompass
• Vehicle guidance
• Station keep and autopilot including
mid water applications
• USBL aided INS survey
• DVL aided relative navigation
Key Features
• Single box solution for motion sensor,
gyrocompass and AAINS
• SPRINT provides concurrent AHRS and
AAINS capability for dual use
• 0.2º (AHRS) to <0.1º (INS) secant
latitude heading accuracy
• 0.1º (AHRS) to <0.05% (INS) roll and
pitch accuracy
• <15 minute settling time
• Fast follow up speed of 900º/sec**
• MTBF inertial sensors (RLG and
Accelerometer) > 400,000 hours
• Choice of depth ratings: 4,000 and
6,000 metres
• Choice of connecters: Seacon
(standard) or Seanet® (for use with
FMC Schilling Robotics ROV)
• Transport approved rechargeable liion battery back-up as standard
• Minimum internal memory of 8 GB
allows post processing and remote
diagnostics
• Ethernet interface
• Lodestar AHRS can be remotely
upgraded to SPRINT INS
Sonardyne UK (Head Office)
T. +44 (0) 1252 872288
F. +44 (0) 1252 876100
E. [email protected]
www.sonardyne.com
Specifications
Lodestar 300 Subsea AHRS / SPRINT 300 Subsea AAINS
Feature
Depth Rating
Physical
Performance
Size
Weight in Air / Water*
Mechanical Construction
Connectors
Heading
Type 8084-000-4511
Type 8084-000-4571
4,000 metres
205 mm Dia. x 260 mm
18.5 kg / 11.5 kg
Titanium
4 x Seacon (8084-4511)
1 x Seacon (8084-4571)
Accuracy (Secant Latitude)
Settle Time
Roll and Pitch
Follow Up Speed
Accuracy
Type 8084-000-9909
Type 8084-000-6511
Type 8084-000-9910
Type 8084-000-6571
4,000 metres
6,000 metres
205 mm Dia. x 250 mm 205 mm Dia. x 280 mm
18.5 kg / 11.5 kg
22 kg / 14 kg
Titanium
Titanium
4 x Seanet® (8084-9909) 4 x Seacon (8084-6511)
1 x Seanet® (8084-9910) 1 x Seacon (8084-6571)
0.2º (Lodestar AHRS)
<0.1º (SPRINT INS)
<15 minutes in dynamic conditions (Lodestar AHRS)
Instantaneous (SPRINT INS)
900º / second**
0.1º (Lodestar AHRS)
<0.05 º (SPRINT INS)
Maximum Acceleration
SPRINT Aided INS
Upgrades
Environmental
Power
Data / Comms.
10.0 g**
Aiding Supported
USBL, Depth, DVL, Zero Velocity, Manual Position
USBL Aided
2 times improvement in precision over ‘raw’ USBL
USBL and DVL Aided
3-6 times improvement in precision over ‘raw’ USBL
DVL Aided Accuracy
0.25% position error for distance travelled
Lodestar 300 AHRS can be remotely upgraded to SPRINT 300 INS
Operating Temperature
-20°C to +55°C
Storage Temperature
-20°C to +60°C
Shock Rating
22 g, 11 ms half sine
Power Requirement
24 / 48 V DC, 15 W nominal, 35 W max
Back Up Battery Type / Life Li-ion / 5 minutes
Data Storage
8 GB internal memory
Digital Ports/Protocol
up to 4 Digital Ports / RS232 or RS485
Other Ports
1 × Ethernet, 4 Triggers
Output Rate
Up to 100 Hz
Output Telegrams
Industry standard AHRS/INS telegrams including acceleration and rotation rates
*Estimated Weights
**Specific outputs such as acceleration and rotation rates may be limited below quoted performance for reasons of export classification and control
Specifications subject to change without notice - 01/2016