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ISM3D Range of AHRS Sensors

Underwater AHRS Providing Heading, Pitch & Roll

The ISM3D is a highly accurate underwater Attitude & Heading Reference System providing Heading to ±1° of local Magnetic North with Pitch and Roll to ±0.07° accuracy.

Description

The ISM3D is a highly accurate underwater Attitude & Heading Reference System providing Heading to ±1° of local Magnetic North with Pitch and Roll to ±0.07° accuracy.

The ISM3D utilises high grade MEMS based Accelerometers, Angular Rate Gyroscopes and Magnetometers all of which feed into an advanced fusion engine driven by a dual core micro-processor.

Provided in a Titanium housing, depth rated to 6,000 meters, with a length of 65mm – the ISM3D sets a new standard in size, durability and capability.

Also available in a Delrin Housing depth rated to 1,000 meters or as an OEM system.

Heading

Heading to ±1° of local Magnetic North.

The Heading is derived from Micro-Electrical-Mechanical-System (MEMS) based technology.

Within the ISM3D there are MEMS based Gyros, Accelerometers & Magnetometers.  The outputs from each of these MEMS devices are fused together using an advanced fusion algorithm.  The output from this is highly stable Heading, Pitch & Roll.

The Heading is highly resilient against temporary magnetic interferes.  This is aided by a soft and hard iron calibration feature once the unit has been installed on the ROV, AUV or other underwater platform.

In areas where a large amount of steel of other magnetic disturber is present, the unit can be set to operate using the Angular Rate Gyroscopes and Accerometers, without input from the Magnetometer.  The low drift rate of the advanced MEMS based Gyroscopes enables navigation to be conducted in areas where previously only a fibre or ring laser diode based heading sensor would suffice.

Pitch & Roll

Pitch & Roll to ±0.07° Accuracy.

The Pitch and Roll reading is derived from Micro-Electrical-Mechanical-System (MEMS) based technology.

Within the ISM3D there are three MEMS based Gyros, Accelerometers & Magnetometers.  The outputs from each of these MEMS devices are fused together, providing highly stable Heading, Pitch & Roll.

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Specifications

Physical Properties

Operating temperature: min. [°C]

-10

Max. operating temperature [°C]

50

Width [m]

0.043

Length [m]

0.043

Height [m]

0.065

Weight [kg]

0.33

Housing material

Titanium or Acetal

General

Area of Application

ROV & AUV Heading & Attitude Sensor

aTtitude

Range

0 to 360

Accuracy

0.07

Resolution

0.01

Type of sensor

MEMS

Heading specifications

Range

0 to 360 degrees

Accuracy

1

Resolution

0.01

Type of sensor

MEMS

Angular Rate

Range: Roll, Pitch, Yaw (°/sec)

2500

Bias Instability (°/hr)

0 - Continuous auto-calibration of gyro bias

Bias Stability Over Temp (°/sec)

0 - Temperature Compensated

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