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Lodestar 300 AHRS


 
General 
Product Name:Lodestar 300 AHRS
Product 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.
Type of application:Marine
Year of initial development:
Height [m]:0.26
Width [m]:0.205
Length [m]:0.205
Weight [kg]:18.5
Min. Voltage (AC):
Max. Voltage (AC):
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
Moving parts:N
Environmental 
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
Data formats 
NMEA formats:GGA; GLL; ZDA; VTG; ACK; PRDID; PHTRO; HDT; THS; MDL; TEMP; TXT; ALR
RTCM:
Other :binary and ASCII messages
GNSS Positioning Sensor 
Number of integrated GNSS receivers and antenna ports:
No. channels p receiver:
Tracked satellite signals:
SBAS differential signals:
RTK Network Compatibility:
Update rate [ Hz ]:
Cold start [ seconds ]:
Hot start [ seconds ]:
GNSS positional accuracy 
Horizontal Position Accuracy [ RMS in cm ] :
Horizontal Position Accuracy (SBAS) [ RMS in cm ]:
Horizontal Position Accuracy (RTK) [ RMS in cm ]:
GNSS aided uncertainty 
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
Increase in position uncertainty w.r.t. stand-alone GPS [m]:
EM log aided uncertainty 
Heading [deg]:0.1
Pitch [deg]:0.01
Roll [deg]:0.01
Heave [m]:0.05
Surge/sway [m]:0.05
Decrease in position accuracy [m/hr]:
Doppler log aided uncertainty 
Heading [deg]:0.1
Pitch [deg]:0.01
Roll [deg]:0.01
Heave [m]:0.02
Surge/sway [m]:
Decrease in position accuracy [m/hr]:3
Unaided uncertainty 
Heading [deg]:0.1
Pitch [deg]:0.01
Roll [deg]:0.01
Heave [m]:0.05
Surge/sway [m]:
Decrease in position accuracy [m/hr]:0.3
Inertial Measurement Unit 
Accelerometer bias [µ-g]:200
gyro bias [deg/hr]:0.01
Calibration procedure:IMU is factory calibrated - no user calibration required. DVL calibration procedure supplied
Software 
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
Maximum latency of log input [ms]:
Uncertainty indicators given in output:1DRMS; 1sigma RMS; error ellipse; etc
Uncertainty of time stamp for output [ms]:0.001
Other specifications 
Export restrictions:US Commerce controled
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.
 


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