Quartz Flexible Accelerometer for Inertial Navigation and Guidance Systems

Inertial navigation system is a kind of autonomous navigation system that does not depend on external information, does not radiate energy to the outside, and is not affected by external electromagnetic interference. 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, integrating it with time, and transforming it into the navigation coordinate system, information such as speed, yaw Angle and position can be obtained in the navigation coordinate system. The principle of the device, the accelerometer, to detect the acceleration by integrating the velocity and through the integrating velocity range, while seeking the gyroscope in the direction detection, the moving distance and the direction vector synthesis of each subdivision point results, calculated the moving distance from the starting point. By entering the fixed position of the starting point, you can always calculate and master your position and speed even when you start to move.

The missile guidance system is also called the missile guidance and control system. The missile guidance system is a system that measures and calculates the relative position of the missile to the target or the space datum line, and controls the missile to reach the target according to the predetermined guidance law. The guidance accuracy mainly depends on the measuring accuracy of the measuring device, the performance of the calculating device and the maneuvering ability of the missile. Accelerometer error and gyroscope drift are the main error sources of the guidance system for inertial guided missiles.

As one of the important components of inertial navigation and guidance system, quartz accelerometer is the first choice when the accuracy of speed measurement is required. Quartz accelerometers use the piezoelectric effect of quartz crystals to measure acceleration. Its structure includes quartz crystal, mass block and electrode, through acceleration sensing, charge accumulation, signal amplification and digitization and other steps, can get the acceleration signal for use. Quartz accelerometer has the characteristics of high precision, high stability and fast response, and has been widely used in space vehicle, navigation system, earthquake monitoring and other fields.

The quartz flexible accelerometer uses high-quality quartz crystals to achieve high precision acceleration measurement with extremely high reliability and stability. Its special flexible construction enables it to adapt to high acceleration applications under various environmental conditions, such as high temperature, high pressure and high vibration environments. It has the characteristics of high precision, high stability, high temperature resistance, small size, etc. It is a physically sensitive measurement and control product, including acceleration, speed, distance, swing, vibration, tilt and so on. According to these characteristics are used for inertial navigation and guidance. ER-QA-01A bias repeatability ≤10μg, repeatability ≤10 PPM, second-order nonlinear repeatability ≤10μg, can provide high-precision data reference in inertial navigation and guidance systems.

Navigation guidance systems for missiles, aircraft, ships, and chariots must have speed and position information. In the case of low requirements, people use airspeed meters, Mach number sensors, odometers, etc., but with the performance requirements of the weapon system. Improve, the above instruments can not meet the requirements. The line accelerometer can be installed in a moving object to directly measure its acceleration, and then obtain the speed and position. The measurement accuracy is high and the dynamic performance is good, which is much better than the airspeed meter and the odometer. Therefore, linear accelerometers are one of the most important applications for inertial navigation guidance systems.

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