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Motus Reference Manual
Page 47 of 146
Version 1.1
29/11/2019
reverse or doesn't use velocity heading or odometer, this function should be disabled.
Reversing detection is enabled by default and it can be disabled using the Filter
Options dialogue in Motus Manager, see section 12.8.2.
11.10 Motion Analysis
Motion analysis is an artificial intelligence algorithm that associates patterns in high
frequency inertial data with the speed of the vehicle. After power on it takes some
time to match patterns with speed before it will become active. Motion analysis only
activates when dead reckoning and is most effective when the vehicle is near
stationary. Motion analysis does not work in all situations and it's primary benefit is in
ground vehicles. When active it can be recognised by 2Hz steps in velocity data.
Motion analysis is disabled by default and can be enabled using the Filter Options
dialogue in Motus Manager, see section 12.8.2.
11.11 Heave
Motus can provide vertical heave position at four different points on a ship. Motus's
heave filter is always on and fully automatic. After power on, Motus requires
approximately 5 minutes for it's heave filter to converge upon an accurate solution.
Heave works without a GNSS fix, however best heave performance is achieved when
Motus has a GNSS fix.
By default Motus provides heave from the point at which the Motus unit is mounted,
however it can provide heave at four different offset points on the ship. To set the
heave offsets, use the Reference Position Offsets dialogue in Motus Manager, see
section 12.8.9.
11.12 Environmental Exposure
Whilst Motus Rugged is environmentally protected, there are clearly defined limits to
this protection that must be adhered to for reliable operation.
Motus Rugged is only protected when it's connector is mated. When any of these
connections are not made the unit offers no environmental protection.
Spanners or tools should never be used to tighten the connectors. They should only
ever be finger tight.
11.12.1 Temperature
Motus should not be subjected to temperature's outside of it's operating range.
Subjecting Motus to temperature's outside of the storage range can cause failure of
the system and or effect the factory sensor calibration which will cause a permanent
performance degradation.
If the temperature rises above 90 degrees Celsius, Motus will automatically shut off
power to its sensors in an attempt to prevent damage, this will also send the filters
into reset.