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Sensors 2016, 16(6), 894; doi:10.3390/s16060894

A High-Spin Rate Measurement Method for Projectiles Using a Magnetoresistive Sensor Based on Time-Frequency Domain Analysis

1
School of Automation, Beijing Institute of Technology, Beijing 100081, China
2
School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
*
Author to whom correspondence should be addressed.
Academic Editor: Subhas Mukhopadhyay
Received: 7 March 2016 / Revised: 3 June 2016 / Accepted: 9 June 2016 / Published: 16 June 2016
(This article belongs to the Special Issue Giant Magnetoresistive Sensors)
View Full-Text   |   Download PDF [3962 KB, uploaded 16 June 2016]   |  

Abstract

Traditional artillery guidance can significantly improve the attack accuracy and overall combat efficiency of projectiles, which makes it more adaptable to the information warfare of the future. Obviously, the accurate measurement of artillery spin rate, which has long been regarded as a daunting task, is the basis of precise guidance and control. Magnetoresistive (MR) sensors can be applied to spin rate measurement, especially in the high-spin and high-g projectile launch environment. In this paper, based on the theory of a MR sensor measuring spin rate, the mathematical relationship model between the frequency of MR sensor output and projectile spin rate was established through a fundamental derivation. By analyzing the characteristics of MR sensor output whose frequency varies with time, this paper proposed the Chirp z-Transform (CZT) time-frequency (TF) domain analysis method based on the rolling window of a Blackman window function (BCZT) which can accurately extract the projectile spin rate. To put it into practice, BCZT was applied to measure the spin rate of 155 mm artillery projectile. After extracting the spin rate, the impact that launch rotational angular velocity and aspect angle have on the extraction accuracy of the spin rate was analyzed. Simulation results show that the BCZT TF domain analysis method can effectively and accurately measure the projectile spin rate, especially in a high-spin and high-g projectile launch environment. View Full-Text
Keywords: spin rate measurement; high-spin projectile; magnetoresistive sensor; time-frequency domain analysis method spin rate measurement; high-spin projectile; magnetoresistive sensor; time-frequency domain analysis method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shang, J.; Deng, Z.; Fu, M.; Wang, S. A High-Spin Rate Measurement Method for Projectiles Using a Magnetoresistive Sensor Based on Time-Frequency Domain Analysis. Sensors 2016, 16, 894.

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