Inertial navigation and satellite navigation have obvious complementary advantages

Inertial navigation system (INS) and satellite navigation system (SNS) are two different navigation technologies. INS relies on an internal inertial measurement unit (IMU), including accelerometers and gyroscopes, to measure the acceleration and angular velocity of the carrier, thereby calculating the position, velocity and attitude information. Satellite navigation systems, such as GPS and Beidou, determine the position of the carrier by receiving signals transmitted by satellites. These two navigation technologies can complement each other to form a combined navigation system. In the combined navigation system, INS can provide initial position and velocity information, help the SNS quickly capture and track satellite signals, and improve the positioning accuracy and reliability of the SNS. At the same time, the SNS can regularly correct the deviation of the INS, reduce the cumulative error of the INS, and improve navigation accuracy.