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Overview
Key Features
Single box solution for motion sensor and gyrocompass
0.1 degree heading accuracy 
0.01 degree roll and pitch accuracy
5cm / 5% heave accuracy
Fast follow up speed of 500/Sec
Available in surface and subsea versions rated to 1000, 3000, 5000 metres
Ethernet interface
Transport approved Li-Ion battery back up as standard
Flexible power input AC or DC
On board 8GB memory (Expandable to 32GB)
MTBF RLG >300,000 hours MTBF Lodestar >50,000 hours
Datasheets
Lodestar Surface
Lodestar Subsea
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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 Sonardyne SPRINT and DP-INS systems. 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).

Applications Include:

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 2000m.

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

 
Specifications - Surface Lodestar
Feature  Type 8084-000-0000
Attitude Heading Range 0-360°
Accuracy 0.1° secant latitude
Settle Time Less than 5 minutes
Follow Up Speed 500º / second
Resolution 0.01º
Roll & Pitch Range ±180º (No physical limit)
Accuracy 0.01º
Resolution 0.01º
Heave Range ±99 m
Accuracy (Real Time) 5 cm or 5% (whichever the greater)
Bandwidth User Selectable
Resolution 0.01 m
Physical Size (hxwxd) 276 mm x 214 mm x 297 mm
Weight 13 kg
Mechanical Construction Aluminium, Powder Coated
Environmental Operating Temperature -10°C to +55°C
Shock Rating Operational 22 g, 11 ms half sine
IP Rating IP66
Power Requirement 110 / 230 V AC, 60 / 50 Hz or 24 / 48 V DC, 15 W nominal, 35 W max
Back Up Battery Type / Life Li-Ion / 2 hours
Data Storage 8GB internal memory (expandable to 32GB)
Digital Output Number of Digital Ports / Protocol 5 x Digital Ports / RS232 or RS485
Other Ports 1 x Ethernet
AAINS Navigation Error-scenario and aiding dependent
Navigation Error (Free Inertial) Typically 10 m, 4 minutes after loss of aiding
Maximum Acceleration 2.5 g or 10.0 g

 
Specifications Subsea Lodestar

Feature  Type 8084-000-1110 (1,000 m depth rated version)
Attitude Heading Range 0-360°
Accuracy 0.1° secant latitude
Settle Time Less than 5 minutes
Follow Up Speed 500º / second
Resolution 0.01º
Roll & Pitch Range ±180º (No physical limit)
Accuracy 0.01º
Resolution 0.01º
Heave Range ±99 m
Accuracy (Real Time) 5 cm or 5% (Whichever the greater)
Bandwidth User Selectable
Resolution 0.01 m
Physical Size (diaxl) 211 mm x 375 mm
Weight In Air/ Water In Water 14.0 kg / 3.0 kg
Mechanical Construction Anodised Aluminium
Environmental Operating Temperature -10°C to +55°C
Shock Rating Operational 22 g, 11 ms half sine
IP Rating IP66
Power Requirement 24 / 48 V DC, 15 W nominal, 35 W max
Back Up Battery Type / Life Li-Ion / 2 hours
Data Storage 8GB internal memory (expandable to 32GB)
Digital Output Number of Digital Ports / Protocol 4 x Digital Ports / RS232 or RS485
Other Ports 1 x Ethernet
AAINS Navigation Error - scenario and aiding dependant
Navigation Error (Free Inertial) Typically 10 m, 4 minutes after loss of aiding
Maximum Acceleration 2.5 g or 10.0 g
 
Manuals

Manual Type Definitions
AM = Application Manual
CL= Command Language Manual
IM = Installation Manual
MM = Maintenance Manual
OM = Operation Manual
SM = System Manual
TM = Training Manual
UM = User Manual

To request a manual simply tick the box next to the manual you require and then press the Request Form button. You will then be able to request addition manuals for other products and your request will be emailed to our Customer Support Team who will reply to your enquiry. Alternatively please contact your local office who will be more than happy to help.

Type 8084 - Lodestar System Manual
Type 8084 - Lodestar Surface Quick Start Guide
Type 8084 - Lodestar Subsea Quick Start Guide
Type 8084 - Lodestar Operator Manual
Type 8084 - Lodestar Command Language

 
Support

Technical Bulletins

TitleDescription
Lodestar based product export licensing - No: TB13-007 Sonardyne has received several enquiries from Customers who have purchased Sonardyne Lodestar based products (currently Lodestar, SPRINT, Lodestar GyroCompatt and Lodestar GyroUSBL) about the requirements to have the product licensed by the US Department of Commerce. This document describes the US Department of Commerce licensing requirements for Lodestar based products.
Lodestar based product export licensing - No: TB12-009 The range of Sonardyne Lodestar based products all contain components which are licensed by the US Department of Commerce and are controlled under the EAR (Export Administration Regulations). Any movement of products containing these items require a Re-export licence issued by the US Department of Commerce.
 
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