The effects of roll, pitch and yaw motions on a ship's magnetic signature are investigated. These three modes of rotary motion, each simple harmonic, are treated as uncoupled and a dipole model representation is used to describe the ship's magnetization. Signatures are computed for a model ship assumed, for simplicity, to be bearing due magnetic North and compared with the steady-state signatures (for no rotary motion). Oscillatory magnetic field components result from these ship motions which decrease in significance, compared to the steady-state fields, as the observation point is moved further away from the ship's passage. These field deviations decrease more rapidly with a beam displacement than with depth. Variation with ship speed is more complicated and depends critically on the values assigned for the amplitudes, frequencies, and relative phases of the three modes of motion. In high sea states the magnetic signatures can vary considerably from those in calm seas with implications for magnetic-influence mine actuation. Keywords: Ship signatures; Magnetic signatures; Sea state; Australia; Ship motion. (edc)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Effect of Ship Motion on Ship Magnetic Signature


    Contributors:

    Publication date :

    1988


    Size :

    33 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Infrared Ship Signature Evaluation

    H. G. Hughes | NTIS | 1989


    Ship Model for Machine Learning Based Ship Signature Classification

    Patrick Nowak / Delf Sachau / Anton Homm | DataCite | 2025


    A Ship Infrared Signature Model

    McLenaghan, I. R. / Moore, A. | SPIE | 1988


    Ship Motion Control

    Roberts, G. N. | British Library Conference Proceedings | 1992


    Surface Ship Infrared Signature Model Evaluation

    C. P. McGrath / D. R. Jensen / P. P. Ostrowski | NTIS | 1994