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Recent developments allow for the production of IMU-enabled GPS devices. An IMU allows a GPS receiver to work when GPS-signals are unavailable, such as in tunnels, inside buildings, or when electronic interference is present. [2] IMUs are used in VR headsets and smartphones, and also in motion tracked game controllers like the Wii Remote.
GPS/INS is commonly used on aircraft for navigation purposes. Using GPS/INS allows for smoother position and velocity estimates that can be provided at a sampling rate faster than the GPS receiver. This also allows for accurate estimation of the aircraft attitude (roll, pitch, and yaw) [citation needed] angles.
[2] The main difference between an Inertial measurement unit (IMU) and an AHRS is the addition of an on-board processing system in an AHRS, which provides attitude and heading information. This is in contrast to an IMU, which delivers sensor data to an additional device that computes attitude and heading.
In 2011, GPS jamming at the civilian level became a governmental concern. [11] The relative ease in ability to jam these systems has motivated the military to reduce navigation dependence on GPS technology. [12] Because inertial navigation sensors do not depend on radio signals unlike GPS, they cannot be jammed. [13]
Direct fusion is the fusion of sensor data from a set of heterogeneous or homogeneous sensors, soft sensors, and history values of sensor data, while indirect fusion uses information sources like a priori knowledge about the environment and human input. Sensor fusion is also known as (multi-sensor) data fusion and is a subset of information fusion.
[2] [3] IPS can achieve position accuracy of 2 cm, [4] which is on par with RTK enabled GNSS receivers that can achieve 2 cm accuracy outdoors. [5] IPS use different technologies, including distance measurement to nearby anchor nodes (nodes with known fixed positions, e.g. WiFi / LiFi access points , Bluetooth beacons or Ultra-Wideband beacons ...
A precise IMU uses laser gyroscopes and precise accelerometers which are expensive. The INS is a sole system with no other inputs. Nowadays the trend of the modern navigation is to integrate [3] signals from IMU together with data provided by Global Positioning System (GPS). This approach gives long term stability to the INS output by ...
The idea of SADS has been around since the 1980s. The basic idea is to use non air data sensors such as Inertial Measurement Unit (IMU) and GPS fused with vehicle dynamics models to estimate air data triplet airspeed, angle of Attack, and angle of sideslip (either separately or combined).