sonardyne lodestar.pdf - Hydroacoustics

Sonardyne UK (Head Office)T. +44 (0) 1252 872288F. +44 (0) 1252 876100E. sales@sonardyne.comwww.sonardyne.comDatasheetLodestar (Surface) - AHRS and Acoustically Aided INSDescriptionLodestar AHRS and Lodestar AAINSsystems are comprised of six sensingelements, three Ring Laser Gyros(RLG) and three linear accelerometers,running a Sonardyne developedgyrocompass algorithm with anoptional AAINS upgrade.The AHRS (Attitude and HeadingReference System) processingpackage is a genuine gyrocompassingalgorithm capable ofprecise heading, roll and pitchestimation in dynamic conditionswithout the need for any aidinginputs or manoeuvres.The AHRS output is available as analignment means to an inertialnavigation algorithm. Uses for theAHRS include a ship’s gyrocompass,attitude compensation for acousticnavigation systems and for surveygrade multi-beam echo sounders.The Acoustically Aided InertialNavigation System (AAINS) takesaiding inputs from LBL and USBLtransceivers as closely coupledobservations in addition to aidingfrom DVLs, GPS and the AHRSalgorithm.Lodestar also applies a heavealgorithm to the vertical motion of theunit resulting in a robust heavemeasurement solution. Therefore, theLodestar product is suitable for anyapplication that requires the accuratemeasurement of heading, heave, roll,pitch and with AAINS, position in ahighly dynamic environment.For a rigorous time reference thelocal clock can be locked to areference clock for missions lastingseveral days. Applications include asecondary reference system input toa DP drilling vessel and a subseaROV navigation system.In addition to the 4 traditional RS485/RS232 serial interfaces to aidingsensors and clients systems there isan Ethernet interface. This providesweb browser operation, delivery ofdata to clients using TCP/IP basedprotocols as well as providing a highspeed link to download the datafrom the mass storage.Key Features• Single IP66 rated solution formotion sensor and gyrocompass• 0.1º heading accuracy unaided• 100,000 hoursMTBF Lodestar >50,000 hours• Designed and Approved to IMOResolution A424(XI)

Sonardyne UK (Head Office)T. +44 (0) 1252 872288F. +44 (0) 1252 876100E. sales@sonardyne.comwww.sonardyne.comSpecificationsLodestar (Surface) - AHRS and Acoustically Aided INSFeature Type 8084-001001AttitudeHeadingRange 0-360°Accuracy0.10° secant latitude rmsSettle Time1.5NM/hr CEPMaximum Acceleration 2.5gSpecifications subject to change without notice - 05/2008