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Lodestar 300 AHRS

Lodestar 300 is a combined solid state Attitude and Heading Reference System (AHRS) and optional SPRINT Acoustically Aided Inertial Navigation System (AAINS). The unit is comprised of three high grade, high reliability, commercially available, Rin

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

Lodestar 300 is a combined solid state Attitude and Heading Reference System (AHRS) and optional 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 AHRS requires no external aiding and can settle in <15 minutes or less in dynamic conditions. SPRINT INS adds advanced Aided Inertial Navigation that runs concurrently with the Lodestar AHRS algorithm. This dual algorithm capability is unique in the market and allows for dual use from one inertial instrument, e.g. Lodestar AHRS for ROV, SPRINT INS for Survey. On-board data storage and backup battery functionality ensures continued operation and no data-loss even if communications or external power is lost.

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
    Force-feedback pendulous (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; PRDID; PHTRO; HDT; THS; MDL; TEMP; 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
  • Decrease in position accuracy [m/hr]
    3
  • Heading [deg]
    0.1
  • Pitch [deg]
    0.01
  • Roll [deg]
    0.01
  • Heave [m]
    0.05
  • Decrease in position accuracy [m/hr]
    0.3
  • 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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