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Lodestar 200 AHRS

Lodestar 200 is a combined solid state Attitude and Heading Reference System (AHRS), which is upgradable to SPRINT Acoustically Aided Inertial Navigation System [AAINS]. The unit is comprised of three high grade, high reliability, commercially ava

Sonardyne International Ltd.
Blackbushe Business Park
GU46 6GD Yateley
United Kingdom of Great Britain & Northern Ireland
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Description

Lodestar 200 is a combined solid state Attitude and Heading Reference System (AHRS), which is upgradable to SPRINT Acoustically Aided Inertial Navigation System [AAINS]. The unit is comprised of three high grade, high reliability, commercially available, Ring Laser Gyros (RLG) and accelerometers. The sensors are also the standard for commercial aviation with a proven 15+ year track record. Lodestar 200 AHRS provides heading, pitch, roll accuracy and settle time that is class leading in the low-cost north seeking subsea AHRS category. It requires no external aiding and can settle in <15 minutes or less in dynamic conditions. On-board data storage and backup battery functionality ensures continued operation and no data-loss even if communications or external power is lost. Lodestar 200 AHRS is designed for subsea vehicle integration and provides industry standard gyrocompass for simple interfacing. In addition, advanced outputs such as acceleration and rotation rates are also provided to support ROV autopilot and station keeping functions. Lodestar 200 AHRS has built-in field upgradability to the higher performance Lodestar 300 AHRS and SPRINT 300 aided INS. This feature allows operators to equip their vehicles with a cost effective AHRS at vehicle assembly whilst ensuring commercial and operational flexibility to upgrade as and when needed in the field. The optional SPRINT upgrade provides a dual algorithm capability, which is unique in the market and allows for dual use from one inertial instrument, e.g. Lodestar AHRS for ROV, SPRINT INS for Survey teams.

Specifications

  • Height [m]
    0.26
  • Width [m]
    0.205
  • Length [m]
    0.205
  • Weight [kg]
    18.5
  • Min. Voltage (DC)
    20
  • Max. Voltage (DC)
    50
  • Power consumption [W]
    15
  • Splashproof casting
    Y
  • Water resistant casting
    Y
  • Water resistance [m]
    6000
  • Mean time between failures [hr]
    400000
  • Type of accelerometer
    Closed-loop (force feedback) Q-Flex
  • Type of gyro
    Ring Laser Gyro (RLG)
  • Removable from base plate
    Y
  • Type of application
    Marine
  • Moving parts
    N
  • Non-operating shock tolerance [g]
    22
  • Operating shock tolerance [g]
    10
  • Min. operating temperature [C]
    -10
  • Max. operating temperature [C]
    55
  • Max. rotation speed [deg/s]
    500
  • NMEA formats
    GGA; GLL; ZDA; VTG; ACK; HDT; THS; TXT; ALR
  • Other
    binary and ASCII messages
  • Heading [deg]
    0.04
  • Pitch [deg]
    0.01
  • Roll [deg]
    0.01
  • Heave: constant part [m]
    0.05
  • Heave: variable part [%]
    5
  • Surge/sway [m]
    0.05
  • Heading [deg]
    0.1
  • Pitch [deg]
    0.01
  • Roll [deg]
    0.01
  • Heave [m]
    0.05
  • Surge/sway [m]
    0.05
  • Heading [deg]
    0.1
  • Pitch [deg]
    0.01
  • Roll [deg]
    0.01
  • Heave [m]
    0.02
  • Heading [deg]
    0.1
  • Pitch [deg]
    0.01
  • Roll [deg]
    0.01
  • Heave [m]
    0.05
  • Accelerometer bias [ยต-g]
    200
  • gyro bias [deg/hr]
    0.01
  • Calibration procedure
    IMU is factory calibrated - no user calibration required. DVL calibration procedure supplied
  • Name
    Lodestar
  • Filtering
    Y
  • Adaptable filter strength
    Yes
  • Adaptable input signals
    Y
  • Integrity monitoring of position input
    Y
  • Integrity monitoring of log input
    Y
  • Max. number of position input signals
    3
  • Max. number of log input signals
    1
  • Maximum latency of position input [ms]
    10000
  • Uncertainty indicators given in output
    1DRMS; 1sigma RMS; error ellipse; etc
  • Uncertainty of time stamp for output [ms]
    0.001
  • Graphical user interface
    Y
  • Typical application
    Acoustical Aided INS for high accuracy survey; subsea metrology and DP. IMO certified AHRS.
  • Distinguishable features
    Customised for reliable use in commercial marine applications and for optimal integration with acoustic positioning systems.
  • Export restrictions
    US Commerce controled

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