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