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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/29715

    Title: The use of level singular value decomposition techniques for vector velocity determinations and its application to tid observations
    Authors: Tsai,LC;Liu,JY;Berkey,FT;Stiles,GS
    Contributors: 太空及遙測研究中心
    Date: 1997
    Issue Date: 2010-06-30 15:17:48 (UTC+8)
    Publisher: 中央大學
    Abstract: Building on previous work related to a determination of dynasonde phase parameters, we have obtained <2 degrees standard deviation in the measured echo phases from an instrument at Bear Lake Observatory in Utah. These small uncertainties in phase measurement enable high-resolution echolocation components and line-of-sight Doppler velocity to be obtained. The purpose of this paper is to describe a level singular value decomposition technique to determine either the full vector velocity versus height or the plasma frequency in the ionosphere. Each three-dimensional velocity vector may be derived by a best fit to a set of echolocation components and Doppler velocities of spatially distributed echoes in independent steps over a frequency range of 0.2 MHz. Previous work has shown that ionospheric echoes in spread F can be used to derive a vector velocity that can be attributed to the flow of F-region plasma; in this work, data from the mid-latitude ionosphere are analyzed, which suggest that the three-dimensional phase motion of atmospheric gravity waves is responsible for the wave-like features that are observed. (C) 1997 COSPAR. Published by Elsevier Science Ltd.
    Appears in Collections:[太空及遙測研究中心] 期刊論文

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