NDLI: Generalized coherences between vector data on two spacecraft

Content Provider	IEEE Xplore Digital Library
Author	Thomson, D.J.
Copyright Year	2006
Description	Author affiliation: Queen's Univ., Kingston, Ont. (Thomson, D.J.)
Abstract	This paper describes some methods to analyze relations between vector-valued time series in a plasma environment. Specifically, we study the propagation between ACE, a spacecraft located at the first Lagrange point; and wind, a spacecraft whose complex orbit includes both Earth and $L_{1}.$ Propagation in an inhomogeneous magnetoplasma, in near-field conditions, and at frequencies below the plasma cutoff frequency makes analytic (or even numerical) solutions extremely difficult. Thus, a major goal is to measure the wavelength as a function of frequency and hence infer the dispersion relations. A major problem is that both spacecraft measure B, but in a plasma, this is insufficient to determine the direction of propagation and polarization properties of the wave. Thus a new method of determining propagation properties is required. We propose to examine the angular offsets between apparent directions derived from principle components of B as a function of frequency on both spacecraft and from the canonical coherences between the two spacecraft. The principle components for both spacecraft and the canonical coherences between the two vector-valued magnetic fields can be efficiently computed by using three singular-value-decompositions (SVD's) at each frequency. The goal is to do three-dimensional "beamforming" from a pair of moving vector sensors in an uncertain propagation environment.
Starting Page	102
Ending Page	106
File Size	206033
Page Count	5
File Format	PDF
ISBN	1424403081
DOI	10.1109/SAM.2006.1706100
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vehicles Plasma measurements Magnetic analysis Cutoff frequency Plasma waves Extraterrestrial measurements Wavelength measurement Plasma properties Time series analysis Lagrangian functions
Content Type	Text
Resource Type	Article

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