This product has built-in three-axis integrated high-precision fiber optic gyroscope, three-axis high-precision quartz flexible accelerometer and mobile surveying-level multi-mode multi-frequency GNSS receiver supporting autonomous Beidou function. Through advanced intelligent combined navigation algorithm and Kalman filter, it is optimized for GNSS occlusion and multipath interference, and can achieve high-precision heading, attitude, speed and position measurement of moving carriers. This inertial navigation system also has multiple sensor interfaces such as GNSS/odometer/DVL/barometric altimeter, which can well meet the long-term, high-precision and high-reliability navigation application requirements in complex environments such as urban canyons, and can be used for navigation and control of various unmanned systems. Product features include: fast and accurate determination of initial heading and attitude, support for real-time heading and attitude output, built-in GPS and Beidou dual-mode receiver, support for dynamic fast alignment, INS/GNSS combination integrated design, support for IE post-processing, enhanced Kalman filter algorithm, and resistance to electromagnetic interference and vibration. It can be used in vehicle-mounted, airborne, ship navigation, stability control and other fields.