REGISTRATION
PERSONAL INFORMATION
| Submission Time: | 2017-07-01 07:16:01 UTC |
| Email: | stanmaydas@gmail.com |
| First Name: | Tanmay |
| Middle Name: | |
| Last Name: | Das |
| Name as it appears on badge : | Tanmay Das |
| Affiliation: | Institute of Radio Physics and Electronics, University of Calcutta, Calcutta, India |
| Nationality: | Indian |
| Degree: | Dr. |
| Preferred Working Group 1st Choice: | WG 7 (MinMax Campaign) |
| Preferred Working Group 2nd Choice: | WG 4 (Event Campaign) |
PRESENTATION
| Title : | IMPACT OF DEPLETIONS IN IONIZATION DENSITY OR TEC BITE-OUTS OF EQUATORIAL PLASMA BUBBLES ON TRANSIONOSPHERIC SATELLITE SIGNALS USING GPS |
| Abstract | |
| This paper represents the impact of ionization depletions/TEC bite-outs of equatorial plasma structures on transionospheric satellite signals received from Calcutta (lat: 22.58oN, long: 88.38oE geo.; 32oN mag. dip) is situated near the northern crest of the equatorial ionization anomaly (EIA) in the Indian longitude sector, using Global Positioning System (GPS) during the equinoctial months of February-April 2011, August-October 2011 and February-April 2012. It is observed that when a bubble moves across a satellite link, scintillations and ionization are usually encountered. The apparent duration of the bite-outs may be different from the true east-west duration, as observed with geostationary links, because of the presence of a relative velocity between the irregularity cloud and the satellite. The trajectory of a GPS satellite plays a vital role in observing the bubble characteristics. The distributions of amplitude and the parameters characterizing the ionization depletions, namely, the duration, depth and the leading and trailing edge slopes of the bubbles have been obtained during the same equinoctial months of 2011 and 2012. It is evident that the range error, extent of the bubble and ionization gradients measured in these equinoctial months of the equatorial region provides the worst case figures for system designers. The high range error (~ 3-4 m) is observed during these equinoctial months. The statistical distributions of the TEC depletions have been studied. Out of 29 bite-outs in February-April, 2011 equinox, the maximum amplitude was found to be about 23.25 TECU with a median depletion of about 5.92 TECU. The maximum amplitude corresponds to a range error of about 3.7 m at GPS L1 frequency. The majority of the bubbles were found to have observed duration between 10-20 minutes with a maximum of 28.14 minutes. The median value of actual duration 2.37 minutes translates to nearly 150sec of possible satellite signal outage. The observed bubbles showed notable asymmetry between the leading and trailing edges. It is observed that the trailing edge slope is sharper than the leading edge slope which implies large pseudorange rates, nearly 157cm/min corresponding to the max value of the descending slope. Similar trends have been observed during other equinoctial months | |
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