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    Design Equations for a Closely-Spaced Two-Element Interferometer Including Internal Noise Coupling

    86111.pdf (340.8Kb)
    Access Status
    Open access
    Authors
    Sutinjo, Adrian
    McKinley, Benjamin
    Belostotski, Leonid
    Ung, Daniel CX
    Thekkeppattu, Jishnu N
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sutinjo, A.T. and McKinley, B. and Belostotski, L. and Ung, D.C.X. and Thekkeppattu, J.N. Design Equations for a Closely-Spaced Two-Element Interferometer Including Internal Noise Coupling. URSI Radio Science Letters. 2.
    Source Title
    URSI Radio Science Letters
    DOI
    10.46620/20-0017
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/86268
    Collection
    • Curtin Research Publications
    Abstract

    We present design equations for a two-element closely-spaced interferometer for measuring the noise temperature of a uniform sky. Such an interferometer is useful for observing highly diffuse radio sources such as the Milky Way and Cosmological signals. We develop a simple equivalent circuit based on radiophysics and antenna theory to describe the interactions between key design parameters such as antenna self and mutual impedance and noise parameters of the receiver; the latter is considered internal noise. This approach straightforwardly facilitates design studies as the response of the uniform signal and the systematic error due to internal noise coupling can be analyzed using the same equivalent circuit. The equivalent circuit shows that mutual coherence due to internal noise coupling is non-negligible and an inherent property of a closely-spaced interferometer. A realistic example design involving two closely-spaced horizontal dipoles over a lossy ground for Cosmological signal detection from 50 to 100 MHz is discussed as an illustration.

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