Navsight Solution
– Hardware Manual
NAVSIGHTHM.1.4
2.2.2. Apogee IMU
Apogee IMU is considered as the highest accuracy for a MEMS Inertial measurement unit. This IMU is the
unit of choice for challenging environments and benefits from its ultra low noise gyroscopes. Sensors
specifications are listed below.
2.2.2.1. Accelerometers
A3
Remarks
Full scale (
g)
± 10
Velocity Random Walk (µ
g/√hz)
30
Allan variance – @ 25°C
In run bias instability (µ
g)
7
Allan variance – @ 25°C
Bandwidth (Hz)
100
Attenuation of 3 dB
Orthogonality (°)
< 0.02
Over temperature range
2.2.2.2. Gyroscopes
G3
Remarks
Full scale (°/s)
± 200
In run bias instability (°/hr)
0.05
Allan variance – @ 25°C
Angular Random Walk (°/√hr)
0.012
Allan variance – @ 25°C
Bandwidth (Hz)
100
Attenuation of 3 dB
Orthogonality (°)
0.02
Over temperature range
2.2.2.3. Surface form factor
The Apogee IMU enclosure is composed of two anodized
aluminum parts (6061), one for the cover and one for the base
plate. The device uses high quality alloys and connectors to
offer a full IP-68 enclosure and a good resistance to harsh
environments.
The Apogee IMU connector is a high quality push pull connector
that offers IP-68 protection even unconnected.
Warning: The Apogee IMU surface model is not
designed for prolonged operation in salt water
environments. Check section Maintenance for more
details about operation in sea water environments.
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Figure 2.5: Apogee Surface IMU
