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Inertial navigation is a technology that measures the acceleration and angular velocity of an aircraft and automatically integrates them to obtain instantaneous velocity and position data of the aircraft. The equipment that makes up the inertial navigation system is installed inside the aircraft and does not rely on external information or radiate energy to the outside world during operation, making it less susceptible to interference. It is an autonomous navigation system.

Inertial navigation systems typically consist of inertial measurement devices, computers, control displays, and other components. Inertial measurement devices include accelerometers and gyroscopes, also known as inertial navigation units. Three degrees of freedom gyroscopes are used to measure the three rotational movements of the aircraft, and three accelerometers are used to measure the acceleration of the three translational movements of the aircraft. The computer calculates the speed and position data of the aircraft based on the measured acceleration signal, and controls the display to display various navigation parameters.

Due to the maturity of accelerometer technology, fiber optic gyroscope is the most important sensing component in the strapdown inertial navigation system, and its performance directly affects the overall performance of the strapdown system. The fiber optic gyroscope AgileLight series developed by Huilian Technology is an interferometric digital ring single axis product, which has the characteristics of large working width, high resolution, small zero drift, short start-up time, shock resistance, vibration resistance, and low cost. It is a good substitute for traditional mechanical gyroscopes, and its use of IntelliProcess technology makes it the best choice for strapdown inertial navigation systems.