Extraction and Filter Algorithm of Roll Angular Rate for High Spinning Projectiles

Chao Li,Ning Liu,Zhong Su,Fuchao Liu,Qing Li,Hui Zhao

doi:10.1155/2019/3181727

Abstract

The accurate measurement of roll angular rate for high spinning projectile has long been a challenging problem. Aiming to obtain the accurate roll angular rate of high spinning projectile, a novel extraction and filter algorithm, BSCZT-KF, is proposed in this paper. Firstly, a compound angular motion model of high spinning projectile is established. According to the model, we translate the roll angular rate measurement problem into a frequency estimation problem. Then the improved CZT algorithm, BSCZT, was employed to realize an accurate estimation of the narrowband signal frequency. Combined with the peak detection method, the BSCZT-KF algorithm is presented to further enhance the frequency estimation accuracy and the real-time performance. Finally, two sets of actual flight tests were conducted to verify the effectiveness and accuracy of the algorithm. The test results show that the average error of estimated roll angular rate is about 0.095% of the maximum of roll angular rate. Compared with the existing methods, the BSCZT-KF has the highest frequency estimation accuracy for narrowband signal.

Highlights

In recent years, with the development of science and technology, conventional artillery shells are developing in the direction of guidance and intelligence
In order to overcome the above problems, this paper proposes a BSCZT-KF algorithm for estimating the angular rate of high spinning projectile
According to the above content, the radial axis magnetometer signal can be used to estimate the angular rate of the rolling angle of the projectile, the subdivision band and subdivision accuracy of the BSCZT method are set, and the accurate projectile roll frequency is obtained by the BSCZT algorithm

Summary

Introduction

With the development of science and technology, conventional artillery shells are developing in the direction of guidance and intelligence. Under the condition of high overload, high rotation speed, and limited space, the accurate measurement of the attitude of high spinning projectiles has not been effectively solved. Raul et al [11] measured the attitude of the high spinning projectiles using a combination of accelerometer, GNSS, and semiactive image detector In this solution, the acquisition accuracy of the gravity vector was closely related to the established dynamic model of the projectile, while the signal of GNSS might be lost, and the data update rate was low. Scheme is simple in structure, strong in autonomy, low in algorithm time complexity, and high in data update rate, so it is extremely suitable for attitude measurement of high spinning projectiles

The Angular Motion Model of

The Time-Frequency Analysis Method for Roll Angular Rate Estimation

Experiment and Analysis

Conflicts of Interest

Findings

Conclusions