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

Area of Science:

• Aerospace Engineering
• Sensor Technology
• Signal Processing

Background:

• Accurate artillery spin rate measurement is vital for projectile guidance and combat efficiency in modern warfare.
• Magnetoresistive (MR) sensors offer a potential solution for spin rate measurement in challenging high-spin and high-g projectile launch environments.

Purpose of the Study:

• To establish a mathematical model relating MR sensor output frequency to projectile spin rate.
• To propose and validate a novel time-frequency domain analysis method for accurate spin rate extraction.

Main Methods:

• Derivation of a mathematical model for MR sensor spin rate measurement.
• Development of the Blackman window function Chirp z-Transform (BCZT) time-frequency analysis method.
• Application of BCZT to measure the spin rate of a 155 mm artillery projectile.

Main Results:

• The BCZT method accurately extracts projectile spin rate from MR sensor data.
• Analysis confirmed the effectiveness of BCZT in high-spin and high-g projectile launch conditions.
• The study investigated the influence of launch rotational angular velocity and aspect angle on spin rate extraction accuracy.

Conclusions:

• The proposed BCZT time-frequency analysis method provides an effective and accurate means for measuring artillery projectile spin rate.
• This technique is particularly suitable for the demanding conditions encountered during projectile launch.