NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.38 [2009] >
IJRSP Vol.38(5) [October 2009] >

Title: Ionospheric time delay variations in the equatorial anomaly region during low solar activity using GPS
Authors: Bhattacharya, Soumi
Purohit, P K
Gwal, A K
Keywords: Time delay variation
Equatorial anomaly region
Total electron content
Ionospheric time delay
Issue Date: Oct-2009
Publisher: CSIR
PACS No.: 94.20.dt; 92.70.Qr
Abstract: Ionosphere can be a greatest variable source of error in precise time transfer using GPS satellites. The proposed navigation concept requires that a user measures the time-delay that satellite emitted signals experience in traversing the distance between satellite and user. The difference between the apparent range and the true range, or the free space velocity and the true velocity, is the quantity of interest. This quantity is directly proportional to the total electron content along the path of propagating signal. Thus, if the total electron content is known or is measured, a perfect correction to ranging could be performed. The equatorial anomaly region, Bhopal (geographic latitude. 23.2ºN, longitude 77.6°E), India with dual frequency from the GSV4004A GPS Ionospheric Scintillation and TEC Monitor (GISTM) receiver have demonstrated a high degree of accuracy in measuring the ionospheric group delay. The diurnal and seasonal variations of ionospheric time delay have been studied during the solar minimum period January to December 2005. It was found that diurnal variation of ionospheric time delay is maximum in the month of April and minimum in the month of December. The study reveals that during low solar activity, equinox season shows the maximum delay while summer gives the moderate and winter shows the minimum delay. The ionospheric time delay was also studied during magnetic storm conditions for the same period and the occurrence of daily maximum ionospheric time delay as a function of day during this period
Page(s): 266-274
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.38(5) [October 2009]

Files in This Item:

File Description SizeFormat
IJRSP 38(5) 266-274.pdf556.75 kBAdobe PDFView/Open
 Current Page Visits: 233 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 170478 since 01-Sep-2015  Last updated on 30-Jun-2016Webmaster: