Publication Date:
2016-06-25
Description:
This study investigates the impact of including the Russian Globalnaya Navigazionnaya Sputnikovaya Sistema (GLONASS) and Global Positioning System (GPS) observables in the estimation of the GPS satellite and receiver interfrequency delay biases. Efforts to advance the Total Electron Content (TEC) accuracy are directly linked to improving the satellite and receiver bias estimation. This analysis is a preliminary assessment of the impact of including GLONASS observables in the bias estimation process. We analyze bias series from 84 globally distributed stations between 02/17/2015 and 03/31/2015. We find that inclusion of GLONASS observables in the biases retrieval algorithm systematically reduces receiver biases at 88% of the stations than when only GPS observables are used. The difference is 〈 1.0 TECU, which falls within the bias retrieval uncertainty. However, due to its systematic behavior it must be characterized and documented. We also compare the bias series between two centers, the Jet Propulsion Laboratory (JPL) and the Center for Orbit Determination in Europe (CODE). Our analysis shows that the mean difference between the two centers varies from station–to–station, with a value 〈 1.0 TECU for 57% of the stations, suggesting an excellent inter–center agreement. For the other stations, the differences can reach up to 5.0 TECU. Finally, the stability of the bias retrievals over time is latitudinally dependent. Low-latitude and middle latitude stations exhibit systematically the largest and smallest scatter, respectively, whereas stations at high latitudes obtain intermediate values.
Print ISSN:
0048-6604
Electronic ISSN:
1944-799X
Topics:
Geosciences
,
Physics
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