High-spin projectile attitude estimation method based on geomagnetic information

Abstract

The invention provides a high-spin projectile attitude estimation method based on geomagnetic information. Data are collected by a triaxial geomagnetic sensor, then an obtained analog signal is converted into a digital signal through an A / D conversion chip, the digital signal enters an FPGA chip, interference is eliminated through a lossless Kalman filter carried in the chip, data obtained by analysis are stored in a black box, and finally various attitude angles of a projectile are estimated through a three-orthogonal ratio method on the basis of the signal subjected to interference elimination. A result of the actual experiment shows that the method is capable of estimating various attitude angles of the projectile in a high-precision manner, has stronger interference resistance to the experiment environment, and can be applied to wide working conditions.

Description

technical field [0001] The invention belongs to the technical field of attitude measurement of rotating objects, and in particular relates to a method for estimating the attitude of a high-rotation projectile based on geomagnetic information. Background technique [0002] Accurately and rapidly measuring and calibrating the attitude of rotating objects is of great significance to improving the speed and accuracy of projectiles. In actual experiments, the object to be measured is usually small in size and flies at high speed in an extreme environment with high overload. Therefore, high-precision sensors such as gyroscopes commonly used in other experiments are not suitable, and the attitude of the object cannot be accurately measured. At this time, MEMS sensors with lower cost, smaller footprint, and strong overload resistance can be used to complete the measurement task. [0003] At present, on this basis, there are many methods that can be applied to the attitude measureme...

AI Technical Summary

Problems solved by technology

Magnetometers measure the attitude of an object by measuring the strength and direction of a magnetic field, which can be used as a specific part in a special method, but it is not widely applicable to most environments

MEMS gyroscopes can be used under normal circumstances, but when the rotating object rotates at a high speed, the attitude of the object cannot be accurately measured

Similarly, the MEMS accelerometer measures the physical attitude by feeling the gravity vector, which is very suitable in normal environments, but when the object to be measured rotates at high speed, the gravity vector cannot be effectively felt, so it cannot be used alone for high-speed rotating objects. attitude measurement

The global navigation satellite system can provide users with all-weather 3D coordinates, speed and time information at any point on the earth's surface or near-Earth space, but it takes time to receive satellite information and it is difficult to achieve real-time measurement, and the information transmission is not stable enough and may cause part lost

High-speed cameras, sun sensors, and infrared sensors will be good choices in a suitable environment, but in actual experiments they are easily affected by various interferences including weather, surrounding environment, etc., and the measurement accuracy is very low

Images