Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-041406-103944


Document Typedissertation
Author NameHatch, Nicholas Adam
URNetd-041406-103944
TitleRadar Based Estimation of Asymmetric Target Inertial Parameters
DegreePhD
DepartmentElectrical & Computer Engineering
Advisors
  • Professor David Cyganski, Advisor
  • Professor Homer F. Walker, Committee Member
  • Professor Kevin A. Clements, Committee Member
  • Keywords
  • estimation
  • radar
  • asymmetric
  • inertial
  • dynamics
  • rigid body
  • exo-atmospheric
  • free body
  • Date of Presentation/Defense2006-02-08
    Availability unrestricted

    Abstract

    Rigid body targets in exo-atmospheric free fall undergo motions defined by classical dynamics. Radar signatures provide a platform for estimation of various parameters relating to the motion and scattering characteristics of the target. This thesis provides a Radar based, physics constrained, estimator of the motion which generates these signatures. As part of this analysis, it defines a motion model for a ``nearly' axially symmetric target in terms of its inertial parameters.

    We show that the time-varying range to a point on the rigid body can be expressed in the form of an amplitude and frequency modulated signal. The frequency decomposition of this range function is used to estimate the target's elliptic modulus, an inertial parameter directly related to the asymmetry. This result has immediate application as a tool to assist the radar analyst in further target characterization and constitutes and essential step to the full reconstruction of a target's geometry from its signature.

    Files
  • nhatch_dissertation.pdf

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