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Lodestar (subsea)


 
General 
Product Name:Lodestar (subsea)
Type of application:
Year of initial development:
Height [m]:0.375
Width [m]:0.205
Length [m]:0.205
Weight [kg]:
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]:5000
Mean time between failures [hr]:300000
Type of accelerometer:Force-feedback pendulous (Q-flex)
Type of gyro:Ring Laser Gyro (RLG)
Removable from base plate:Y
Moving parts:
Environmental 
Non-operating shock tolerance [g]:
Operating shock tolerance [g]:
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 :TSS1; TSS2; TSS3; EM1000; EM2999
GNSS aided uncertainty 
Heading [deg]:0.05
Pitch [deg]:0.01
Roll [deg]:0.01
Heave: constant part [m]:0.05
Heave: variable part [%]:5
Surge/sway [m]:
Increase in position uncertainty w.r.t. stand-alone GPS [m]:
EM log aided uncertainty 
Heading [deg]:0.1
Pitch [deg]:0
Roll [deg]:0
Heave [m]:0.05
Surge/sway [m]:
Decrease in position accuracy [m/hr]:
Doppler log aided uncertainty 
Heading [deg]:0.05
Pitch [deg]:0.01
Roll [deg]:0.01
Heave [m]:0.02
Surge/sway [m]:
Decrease in position accuracy [m/hr]:2
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]:4630
Inertial Measurement Unit 
Accelerometer bias [µ-g]:50
gyro bias [deg/hr]:0.01
Calibration procedure:Non return to factory calibration procedure supported.
Software 
Name:
Filtering:
Adaptable filter strength:Y
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:
Maximum latency of position input [ms]:9000
Maximum latency of log input [ms]:1000
Uncertainty indicators given in output:1DRMS; 1sigma RMS; error ellipse; etc
Uncertainty of time stamp for output [ms]:0.001
Other specifications 
Export restrictions:
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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