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Simulated gps observation of traveli...

Lee, See-Chen G.

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Simulated gps observation of traveling ionospheric disturbance from ground based receivers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Simulated gps observation of traveling ionospheric disturbance from ground based receivers./
Author:	Lee, See-Chen G.
Description:	80 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
Contained By:	Dissertation Abstracts International77-08B(E).
Subject:	Engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10075610
ISBN:	9781339582429

Simulated gps observation of traveling ionospheric disturbance from ground based receivers.
Lee, See-Chen G.

Simulated gps observation of traveling ionospheric disturbance from ground based receivers. - 80 p.

Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.

Thesis (Ph.D.)--Purdue University, 2015.

Traveling Ionospheric Disturbances (TID) can be induced by acoustic waves in the neutral atmosphere, allowing such process to be observed as changes in the trans-ionospheric GNSS signal. Coherence between measurements from dierent stations within a large, dense GNSS network has been used to identify and characterize various TIDs. In order to evaluate the sensitivity, accuracy and possible biases of this technique, a simulator has been developed. The magneto-hydrodynamic (MHD) equations were simplifyed through assumptions about the time scales of various processes, and the interactions between ions and electrons in the ionosphere. A ray-trace method was used propagate the acoustic wave from the surface and the problem was approximated as axially symmetric about the point source location, allowing a two-dimensional cylindrical coordinate system to be used. These model simplificationcations were necessary to produce a numerically efficient algorithm capable of simulating hundreds of GNSS ray paths, in order to represent the response over a large network. Ground motion observed during the 2011 Tohoku earthquake and tsunami was used to define the input signal. Synthetic waveforms produced from the model were found to agree well with the GNSS observations made in Japan during that event. Arrival time errors showed geographical correlation with the distance form the epicenter, indicating the limitations of the point-source approximation.

ISBN: 9781339582429Subjects--Topical Terms:

586835
Engineering.

Simulated gps observation of traveling ionospheric disturbance from ground based receivers.
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020 $a 9781339582429
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100 1 $a Lee, See-Chen G. $3 3192673
245 1 0 $a Simulated gps observation of traveling ionospheric disturbance from ground based receivers.
300 $a 80 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
500 $a Adviser: James L. Garrison.
502 $a Thesis (Ph.D.)--Purdue University, 2015.
520 $a Traveling Ionospheric Disturbances (TID) can be induced by acoustic waves in the neutral atmosphere, allowing such process to be observed as changes in the trans-ionospheric GNSS signal. Coherence between measurements from dierent stations within a large, dense GNSS network has been used to identify and characterize various TIDs. In order to evaluate the sensitivity, accuracy and possible biases of this technique, a simulator has been developed. The magneto-hydrodynamic (MHD) equations were simplifyed through assumptions about the time scales of various processes, and the interactions between ions and electrons in the ionosphere. A ray-trace method was used propagate the acoustic wave from the surface and the problem was approximated as axially symmetric about the point source location, allowing a two-dimensional cylindrical coordinate system to be used. These model simplificationcations were necessary to produce a numerically efficient algorithm capable of simulating hundreds of GNSS ray paths, in order to represent the response over a large network. Ground motion observed during the 2011 Tohoku earthquake and tsunami was used to define the input signal. Synthetic waveforms produced from the model were found to agree well with the GNSS observations made in Japan during that event. Arrival time errors showed geographical correlation with the distance form the epicenter, indicating the limitations of the point-source approximation.
590 $a School code: 0183.
650 4 $a Engineering. $3 586835
650 4 $a Remote sensing. $3 535394
650 4 $a Atmospheric sciences. $3 3168354
690 $a 0537
690 $a 0799
690 $a 0725
710 2 $a Purdue University. $b Aeronautics and Astronautics. $3 1035670
773 0 $t Dissertation Abstracts International $g 77-08B(E).
790 $a 0183
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10075610