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access icon free Real-time estimation of roll angle for trajectory correction projectile using radial magnetometers

  • Author(s): Hui Zhao 1, 2  and  Zhong Su 1, 2
    • View affiliations
  • Source: Volume 14, Issue 10, October 2020, p. 1559 – 1570
    DOI:  10.1049/iet-rsn.2020.0136 , Print ISSN 1751-8784, Online ISSN 1751-8792
© The Institution of Engineering and Technology
Received 27/03/2020, Accepted 10/06/2020, Revised 08/06/2020, Published 12/06/2020

An adaptive extend Kalman filter（EKF） is designed to estimate the roll angle for trajectory correction projectile only using radial magnetometers. By analysing the characteristics of the radial magnetometer output signal and the complex angular motion of the high-spin projectiles, the measurement equation is established. Two important measures, namely noise parameter adaptation and increasing system observation, are taken to improve the performance of the designed EKF. The novelty of this study is the proposed adaptive EKF has no requirements on the magnetometer measurement accuracy. That is the magnetometers used need not undergo a complicated calibration process. In addition, orthogonal difference method is introduced to adjust noise parameters. Finally, a series of numerical simulations and flight tests are carried out to verify the performance of the proposed method. The results show the designed adaptive EKF can effectively estimate the roll angle for the trajectory correction projectile and could be extended to practical engineering applications.

Inspec keywords: projectiles; magnetometers; nonlinear filters; Kalman filters; calibration

Other keywords: complex angular motion; designed adaptive EKF; roll angle; high-spin projectiles; magnetometer measurement accuracy; time estimation; radial magnetometer output signal; measurement equation; trajectory correction projectile; noise parameter adaptation

Subjects: Sensing devices and transducers; Filtering methods in signal processing; Magnetic variables measurement; Measurement standards and calibration; Weapons; Ballistics and mechanical impact (mechanical engineering); Standards and calibration

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