GPS World, June 2016
One team with one goal accurate and reliable GNSS positioning anywhere JUNE 2016 WWW GPSWORLD COM GPS WORLD 63 to test the utility of the smartphonebased solution and to demonstrate the feasibility of easily setting up remote field sites for the purpose of filling in gaps in data coverage During this campaign we collected data at the three sites listed in Table 1 using three different receivers About 220 MB of data were collected in total at all of the sites Table 1 summarizes the relevant information about the field test sites The first field site visited was the Universidade Luterana do Brasil ULBRA campus in Manaus on Jan 30 2015 This site is in close proximity to the geomagnetic equator Because the receiver at the ULBRA campus is involved in ongoing scientific observations we were only able to collect data for a short period of time approximately an hour in total Nevertheless we were able to attach the smartphone configure the GNSS receiver to produce the appropriate data products and start data collection all within about 10 minutes In total only 20 minutes of GPS data were collected at this location but the experience demonstrated how quickly the app based solution can be installed The second and third field sites visited were near São José dos Campos on the campuses of the Instituto Nacional de Pesquisas Espaciais INPE and Universidade do Vale do Paraíba UNIVAP São José dos Campos is well to the south of the geomagnetic equator and in the Appleton anomaly region We successfully collected observations from both sites but were only able to conduct long duration testing at the UNIVAP site approximately 95 hours in total This data is shown in FIGURE 6 in total electron content units TECu 1016 electrons per square meter in the bottom plot with the four letter site name SAUN The other data in Figure 6 site names MCL1 RJCG ONRJ were processed from GPS receivers operated by Instituto Brasileiro de Geografia e Estatística IBGE These observations show a progression of TEC values as a function of latitude and were collected on Feb 5 2015 a day of minor geomagnetic activity the highest value reached of the Kp index an indication of global geomagnetic activity was 33 and of moderate solar flux 107 centimeter solar flux an indicator of solar activity was 142 The data collected at UNIVAP covers the period from 10 00 until 20 00 UTC Note that for the earlier more geophysically active period shown in Figure 6 between 0 00 and 5 00
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