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 co mmunicate attitude during vehicle br own-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 vesse l 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 reliabi lity 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 ? <5 minute settling time ? 5cm / 5% heave accuracy ? fast follow up speed of 500o / sec ? mtbf rlg >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 subject to change without notice - 02/2009 specifications lodestar- attitude & heading reference system (subsea) 205mm 330mm 358mm feature type 8084-000-11 type 8084-000-16 type 8084-000-21 depth rating 1,000 metres 3,000 metres 5,000 metres physical size 205mm dia. x 358 mm 220mm dia. x 425mm 205mm dia. x 409mm weight in air / water 13.9kg / 2.9kg 22kg / 8kg 39kg / 28kg mechanical construction anodised aluminiu m anodised aluminium super duplex s/steel specifications common to all ty pe 8084 subsea lodestar units. attitude heading range 0-360o accuracy 0.10o secant latitude rms settle time <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 99m accuracy (real time) 5cm or 5% (whichever the greater) bandwidth user selectable resolution 0.01m environmental operating temperature -10c to +55c shock rating operational 22g, 11ms half sine power requirement 18 ? 50v dc, 15w nominal, 20w peak back up battery type / life li-ion / 3 hours data storage 4gb internal memory digital output number of digital ports/protocol 4 digital ports / rs232 or rs485 other ports 1 ethernet optional ins upgrade path yes navigation error (free inertial) >1.5nm/hr cep maximum acceleration 2.5g
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