8084-000-21

Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Datasheet Lodestar – Attitude & Heading Reference System (Subsea) Description Lodestar is a solid state IMO approved Attitude and Heading Reference System (AHRS). The unit is comprised of six sensing elements, three Ring Laser Gyros (RLG) and three linear accelerometers, running a Sonardyne developed gyrocompass algorithm. Incorporating a rugged housing, Lodestar AHRS can be supplied to suit any depth of subsea application. With a battery back up capability supplied as standard, the unit is able to continue to communicate attitude during vehicle brown-outs. Pole mounted applications can provide a more accurate solution to the multibeam or USBL operation. The Lodestar AHRS utilizes a genuine gyrocompassing algorithm capable of precise heading, roll and pitch estimation in dynamic conditions without the need for external aiding inputs or vessel manoeuvres. Lodestar also applies a heave algorithm to the vertical motion of the unit resulting in a robust heave measurement solution. Therefore, the Lodestar product is suitable for any application that requires the accurate measurement of heading, heave, roll, and pitch in a highly dynamic environment. Where high accuracy and a risk free solution is required, the Lodestar AHRS is an ideal replacement for the motion sensor and gyrocompass package, due to its dynamic capability and fast spin up time. The Sonardyne Lodestar has been designed with reliability as a priority. The unit comprises of high grade, commercially available, IMU components with a very high meantime between failure (MTBF). Lodestar is compatible with all Sonardyne LBL and USBL products, as well as multiple applications in the offshore and survey marketplace. Key Features • Single box solution for motion sensor and gyrocompass • 0.1º heading accuracy • 0.01º roll and pitch accuracy • 100,000 hours MTBF Lodestar >50,000 hours • Choice of depth ratings: 1,000 3,000 and 5,000 metres • Surface version available • Transport approved Li-Ion battery back up as standard • Internal 4GB memory allows post processing of a 2 day mission • Designed and approved to IMO Resolution A424(XI) • Ethernet interface • INS ready Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Specifications Lodestar- Attitude & Heading Reference System (Subsea) 205mm 330mm 358mm Feature Depth Rating Physical Size Weight in Air / Water Mechanical Construction Type 8084-000-11 1,000 metres 205mm Dia. x 358 mm 13.9kg / 2.9kg Anodised Aluminium Type 8084-000-16 3,000 metres 220mm Dia. x 425mm 22kg / 8kg Anodised Aluminium Type 8084-000-21 5,000 metres 205mm Dia. x 409mm 39kg / 28kg Super Duplex S/Steel Specifications Common To All Type 8084 Subsea Lodestar Units. Attitude Heading Range Accuracy Settle Time Follow Up Speed Resolution Roll & Pitch Range Accuracy Resolution Heave Range Accuracy (Real Time) Bandwidth Resolution Environmental Operating Temperature Shock Rating Operational Power Requirement Back Up Battery Type / Life Data Storage Digital Output Number of Digital Ports/Protocol Other Ports Optional INS Upgrade Path Navigation Error (Free Inertial) Maximum Acceleration 0-360º 0.10º secant latitude rms 1.5NM/hr CEP 2.5g Specifications subject to change without notice - 02/2009