Definition Of Inertial Navigation System And Micro-Custom Navigation System

The inertial navigation system (INS, Inertial Navigation System) uses the gyro and accelerometer as the navigation parameter solving system of the sensitive device. The system establishes the navigation coordinate system according to the output of the gyro, and calculates the navigation vector carrier according to the output of the accelerometer. The speed and position in the navigation coordinate system, while the inertial navigation system is also called the inertial reference system. It is an autonomous navigation system that does not rely on external information and does not radiate energy to the outside (such as radio navigation). Its working environment Not only in the air, the ground, but also under water, the basic working principle of inertial navigation is based on Newton's laws of mechanics. By measuring the acceleration of the carrier in the inertial reference frame, it integrates the time and transforms it into the navigation coordinates. In the system, information such as speed, yaw angle and position in the navigation coordinate system can be obtained.

Advantages of inertial navigation system:

1、 Because it is not dependent on any external information, does not radiate energy to the outside of the autonomous system, so good concealment, is not affected by external electromagnetic interference;
2、It can be all-weather, full time work in the air, the earth surface and even underwater;
3、It can provide position, speed, heading and attitude Angle data, the generated navigation information continuity is good and low noise; 4、High data update rate, short-term accuracy and stability.

Gyroscope and accelerometer are indispensable core measurement devices in inertial navigation system. Modern high precision inertial navigation system puts forward high requirements on the gyroscope and accelerometer used, because the drift error of gyroscope and the zero offset of accelerometer are the most direct and important factors affecting the accuracy of inertial navigation system. The reason why ER-MG2-50/100 is popular in the market is that it has a bias instability of 0.01-0.02°/hr and an angular random walk of 0.0025-0.005°/√hr. Designed for applications such as north finding, pointing, initial alignment, gyroscope tools, mining/drilling equipment, weapon/drone launch systems, satellite antennas, target tracking systems, etc.

Generally speaking, Micro-INS (Micro-Inertial-Navigation System) is a micro-inertial system based on Micro-Inertial-Navigation System (MEMS). Navigation System.

Based on low-cost universal MEMS devices, the micro-inertial navigation system combines the above sensors according to the needs of application, error correction and error compensation, makes full use of the advantages of each sensor and achieves the goal of high-precision autonomous positioning through carrier motion pattern learning, filtering algorithm design, hardware and structure design. It does not rely on any auxiliary equipment or prior database such as navigation satellites, wireless base stations, electronic tags, etc.It can complete the accurate positioning of personnel, vehicles, and robots in any scenario only through the small and miniature inertial sensors configured by the carrier itself.

Microelectromechanical systems (hereinafter referred to as MEMS), also known as microelectromechanical systems, microsystems, micromachines, etc., are developed on the basis of microelectronics technology (semiconductor manufacturing technology), combining lithography, etching, thin film, LIGA, silicon. High-tech electromechanical devices made by micromachining, non-silicon micromachining and precision machining. MEMS is an independent intelligent system that can be mass-produced, with a system size of a few millimeters or even smaller, and its internal structure is generally in the order of microns or even nanometers. Common products include MEMS accelerometers, MEMS gyroscopes, MEMS humidity sensors, MEMS gas sensors, and their integration products.

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