Results 81 to 90 of about 17,936 (197)

APPPOLO: A Brazilian Processing Software for Multi-GNSS Precise Point Positioning [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
This paper presents the development and evaluation of a Brazilian software for Precise Point Positioning (PPP) using multiple Global Navigation Satellite Systems (GNSS).
J. P. V. Zaupa, D. B. M. Alves, P. D. T. Setti Jr   +2 more
doaj   +1 more source

Tightly Coupled Integration of Ionosphere-Constrained Precise Point Positioning and Inertial Navigation Systems

Sensors, 2015
The continuity and reliability of precise GNSS positioning can be seriously limited by severe user observation environments. The Inertial Navigation System (INS) can overcome such drawbacks, but its performance is clearly restricted by INS sensor errors ...
Zhouzheng Gao, Hongping Zhang, Maorong Ge, Xiaoji Niu, Wenbin Shen, Jens Wickert, Harald Schuh   +6 more
doaj   +1 more source

AATR an ionospheric activity indicator specifically based on GNSS measurements [PDF]

, 2018
This work reviews an ionospheric activity indicator useful for identifying disturbed periods affecting the performance of Global Navigation Satellite System (GNSS). This index is based in the Along Arc TEC Rate (AATR) and can be easily computed from dual-
González Casado, Guillermo, Ibáñez Segura, Deimos, Juan Zornoza, José Miguel, Orús Pérez, Raul, Rovira Garcia, Adrià, Sanz Subirana, Jaume   +5 more
core   +2 more sources

Accuracy of GPS precise point positioning (PPP)

, 2020
We tried to show how the accuracy of GPS varies with respect to observing sessionduration by using the method of GIPSY precise point positioning (PPP), and how the site?scoordinates latitude, longitude and ellipsoidal height are affected.We used eleven IGS sites scattered almost evenly across the earth. GPS data wereobtained from SOPAC archives at http:
openaire   +1 more source

Simulation case study of deformations and landslides using real-time GNSS precise point positioning technique

Geomatics, Natural Hazards & Risk, 2016
The precise point positioning (PPP) is a Global Navigation Satellite System (GNSS) computation technique that performs precise positioning using a single receiver.
Raquel M. Capilla, José Luis Berné, Angel Martín, Raul Rodrigo   +3 more
doaj   +1 more source

An Optimum Strategy for Producing Precise GPS Satellite Orbits using Double-Differenced Observations

Journal of Engineering, 2018
Both the double-differenced and zero-differenced GNSS positioning strategies have been widely used by the geodesists for different geodetic applications which are demanded for reliable and precise positions.
Oday Yaseen Mohamed Zeki Alhamadani
doaj   +1 more source

Hertz-level Measurement of the 40Ca+ 4s 2S1/2-3d 2D5/2 Clock Transition Frequency With Respect to the SI Second through GPS

, 2011
We report a frequency measurement of the clock transition of a single ^40Ca^+ ion trapped and laser cooled in a miniature ring Paul trap with 10^-15 level uncertainty.
Cao, J., Gao, K., Guan, H., Huang, X., Huang, Y., Li, T., Liang, K., Liu, P., Ou, B.   +8 more
core   +1 more source

Differences in Time Comparison and Positioning of BDS-3 PPP-B2b Signal Broadcast Through GEO

Remote Sensing
The BeiDou-3 Navigation Satellite System (BDS-3) precise point positioning (PPP) service through the B2b signal (PPP-B2b) leverages precise correction data disseminated by satellites to eliminate or mitigate key error sources, including satellite orbit ...
Hongjiao Ma, Jinming Yang, Xiaolong Guan, Jianfeng Wu, Huabing Wu   +4 more
doaj   +1 more source

Time transfer through optical fibers over a distance of 73 km with an uncertainty below 100 ps

, 2012
We demonstrate the capability of accurate time transfer using optical fibers over long distances utilizing a dark fiber and hardware which is usually employed in two-way satellite time and frequency transfer (TWSTFT).
Bauch, A., Feldmann, T., Piester, D., Rost, M., Wübbena, T., Yang, W.   +5 more
core   +1 more source

Galileo millimeter-level kinematic precise point positioning with ambiguity resolution

Earth, Planets and Space, 2019
On February 11, 2019, four additional Galileo satellites were put into service, approaching the completion of the European global navigation satellite system constellation.
Georgia Katsigianni, Felix Perosanz, Sylvain Loyer, Mini Gupta   +3 more
doaj   +1 more source