![]() By processing signals from these devices it is possible to track the position and orientation of a device. Inertial measurement units (IMUs) typically contain three orthogonal rate-gyroscopes and three orthogonal accelerometers, measuring angular velocity and linear acceleration respectively. Inertial navigation is a self-contained navigation technique in which measurements provided by accelerometers and gyroscopes are used to track the position and orientation of an object relative to a known starting point, orientation and velocity. A smaller radius corresponds to a higher accuracy. The radius of the circle indicates the accuracy. ![]() Integrals in the time domain implicitly demand a stable and accurate clock for the quantification of elapsed time.Ĭomparison of accuracy of various navigation systems. ![]() Older INS systems generally used an inertial platform as their mounting point to the vehicle and the terms are sometimes considered synonymous. Other terms used to refer to inertial navigation systems or closely related devices include inertial guidance system, inertial instrument, inertial measurement unit (IMU) and many other variations. INSs are used on mobile robots and on vehicles such as ships, aircraft, submarines, guided missiles, and spacecraft. ![]() Often the inertial sensors are supplemented by a barometric altimeter and sometimes by magnetic sensors ( magnetometers) and/or speed measuring devices. ![]() A 1950s inertial navigation control developed at MIT.Īn inertial navigation system ( INS) is a navigation device that uses motion sensors ( accelerometers), rotation sensors ( gyroscopes) and a computer to continuously calculate by dead reckoning the position, the orientation, and the velocity (direction and speed of movement) of a moving object without the need for external references. ![]()
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