Aimed Inertial Navigation System (INS)

Aimed Inertial Navigation System (INS)

An inertial navigation system (INS) uses motion sensors, typically accelerometers and gyroscopes found in an inertial measurement unit (IMU), to calculate position, velocity, and orientation without the use of external references like GPS/GNSS.gps aided inertial navigation system INS systems are commonly used in military and commercial aircraft, spacecraft and missiles, submarines, autonomous vehicles, robots, and even some mobile phones and video game controllers. They are also widely used as a fall-back for dead reckoning when GPS/GNSS isn’t available.

INS and other inertial navigation systems have been around for longer than one might think.gps aided inertial navigation system Efforts to combine inertial systems with satellite navigation systems date back to the Minuteman missile and Project Apollo in the 1940s. Since then, miniaturization of computers and advances in the construction of micro-electromechanical system (MEMS) sensors have pushed these systems to ever more advanced capabilities.

Today’s INS systems are often combined with GNSS receivers and other navigation sensors to provide a more accurate solution.gps aided inertial navigation system GNSS provides long term position and velocity information, and the IMU sensors help to correct accumulated error from dynamic movement over time. The result is a highly accurate navigation system that can be utilized even when GNSS signals are occluded or unavailable.

The technical intricacies and sophisticated processes that make up aided inertial navigation systems are complex, but they offer incredible accuracy, stability, and resilience. They are the key to advanced automotive driver assistance features, precision agriculture equipment, and other applications that rely on precise positioning information.

Inertial navigation systems are a critical part of the modern world. They are vital in drones, autonomous cars, military vehicles and weapons, submarines, aircraft, and spacecraft. They are also the key to the many advanced safety features that are now being developed for automobiles. The world would be a much different place without them.

GNSS / Inertial Navigation System Integration

In general, a loosely coupled GNSS/INS system integrates the navigation solution provided by the GNSS (position, velocity and attitude) with the navigation solution produced by the IMU using an extended Kalman filter. This technique allows a more accurate estimate of the combined system’s errors to be obtained, and it also makes it possible to compensate for the raw accelerometer and gyroscope measurements by tracking their bias.

A gyroscope is a sensor that measures the angular rotation of the system’s inertial reference frame. OXTS Inertial Navigation System products incorporate MEMS gyroscopes that measure angular displacement in degrees per second. This provides the system with an understanding of the system’s rotation and enables it to be stabilized.

An accelerometer is a sensor that measures the acceleration of the system’s inertial reference plane. OXTS Inertial Navigation System accelerometers measure acceleration in the x-, y-, and z-direction. This information enables the system to determine speed, distance travelled and, most importantly in an automotive testing setting, the time until impact. The system can also determine the pitch and roll of the vehicle by combining the acceleration and gyroscope data. A computer then correlates these measurements to determine the current heading of the system.

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