Inertial Navigation Systems / 慣性導航系統
Inertial Navigation Systems calculate the real-time position, velocity and
orientation of a moving vehicle via the use of motion sensors. The measurements
provided by accelerometers and gyroscopes within these systems are used to track
the movements of an object relative to a known starting position.
Both commercial and military projects have seen the use of Inertial Navigation
Systems for several decades, during which these systems were under constant
development and revision. An Inertial Navigation System is basically divided
into two parts:
-
An Inertial Measurement Unit (IMU), which provides live measurements of
acceleration and velocity in the body frame
-
A state update system, which uses the values provided by the IMU to update
the position, velocity and orientation of the vehicle in the navigation
frame and orientation of the vehicle in the navigation frame
The MEMS sensors
The way in which an INU is designed affects the cost of the entire Inertial
Navigation System. As such, finding low-cost and lightweight solutions is
critical when attempting to make Inertial Navigation Systems available to
applications that cannot implement large-sized, heavy sensors – such as human
motion capture.
MEMS inertial sensors solve
these issues and provide exceptional levels of performance in terms of long-term
stability, temperature stability and accuracy. Moreover, MEMS inertial sensors
can function successfully under harsh conditions.
Colibrys MEMS accelerometer
Our MS9000 family
encompasses extra-small accelerometers dedicated to inertial sensing
applications. Accelerometers in this family have an excellent long-term bias
stability and can operate under extreme shock, vibrations and temperature.
The MS9000 single-axis analog accelerometer has a dynamic range of ±2g to ±200g,
embeds a low-power ASIC (0.5 mA) and a temperature sensor. It comes fully
calibrated in a robust, hermetically-sealed LCC20 ceramic package, guaranteeing
long-term stability and durability.
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