Results 1 to 10 of about 806 (126)
Multi-GNSS PPP-RTK: From Large- to Small-Scale Networks [PDF]
Sensors, 2018 Precise point positioning (PPP) and its integer ambiguity resolution-enabled variant, PPP-RTK (real-time kinematic), can benefit enormously from the integration of multiple global navigation satellite systems (GNSS). In such a multi-GNSS landscape, the positioning convergence time is expected to be reduced considerably as compared to the one obtained ...
Nandakumaran Nadarajah +2 more
exaly +9 more sources
On the Problem of Double-Filtering in PPP-RTK. [PDF]
Sensors (Basel), 2022 To obtain single-receiver Global Navigation Satellite System (GNSS) parameter solutions, the PPP-RTK user-filter combines measurements with time-correlated corrections that are separately computed by the filter of an external provider. The consequence of exercising such double-filtering is that the Kalman filter’s standard assumption of having ...
Khodabandeh A, Teunissen PJG, Psychas D.
europepmc +6 more sources
Review and principles of PPP-RTK methods [PDF]
Journal of Geodesy, 2014 PPP-RTK is integer ambiguity resolution-enabled precise point positioning. In this contribution, we present the principles of PPP-RTK, together with a review of different mechanizations that have been proposed in the literature. By application of $$\mathcal {S}$$
Peter J G Teunissen +2 more
exaly +3 more sources
PPP-RTK and inter-system biases: the ISB look-up table as a means to support multi-system PPP-RTK [PDF]
Journal of Geodesy, 2016 PPP-RTK has the potential of benefiting enormously from the integration of multiple GNSS/RNSS systems. However, since unaccounted inter-system biases (ISBs) have a direct impact on the integer ambiguity resolution performance, the PPP-RTK network and user models need to be flexible enough to accommodate the occurrence of system-specific receiver biases.
Amir Khodabandeh +2 more
exaly +3 more sources
A Two-Step Regional Ionospheric Modeling Approach for PPP-RTK. [PDF]
Sensors (Basel)In the precise point positioning/real-time kinematic (PPP-RTK) technique, high-precision ionospheric delay correction information is an important prerequisite for rapid PPP convergence. The commonly used ionospheric modeling approaches in the PPP-RTKs only take the trend term of the ionospheric total electron content (TEC) variations into account. As a
Xu Z, Cai C, Pan L, Dai W, He B.
europepmc +4 more sources
The role of fibroblast growth factors in cell and cancer metabolism. [PDF]
FEBS LettFibroblast growth factor (FGF) signaling regulates crucial signaling cascades that promote cell proliferation, survival, and metabolism. Therefore, FGFs and their receptors are often dysregulated in human diseases, including cancer, to sustain proliferation and rewire metabolism.
Price J, Francavilla C.
europepmc +2 more sources
A study on predicting network corrections in PPP-RTK processing [PDF]
Advances in Space Research, 2017 Abstract In PPP-RTK processing, the network corrections including the satellite clocks, the satellite phase biases and the ionospheric delays are provided to the users to enable fast single-receiver integer ambiguity resolution. To solve the rank deficiencies in the undifferenced observation equations, the estimable parameters are formed to generate ...
Kan Wang +2 more
exaly +3 more sources
PPP/PPP-RTK Message Authentication
NAVIGATION: Journal of the Institute of Navigation, 2021 This paper analyzes candidate schemes for PPP/PPP-RTK (precise point positioning/real-time kinematic) data authentication. Asymmetric schemes are proposed based on existing standards and compatible with GNSS messages. Post-quantum cryptographic signatures are also reviewed and discussed.
Fernandez-Hernandez, Ignacio +3 more
openaire +4 more sources
Assessing the Performance of Multi-GNSS PPP-RTK in the Local Area [PDF]
Remote Sensing, 2020 The benefits of an increased number of global navigation satellite systems (GNSS) in space have been confirmed for the robustness and convergence time of standard precise point positioning (PPP) solutions, as well as improved accuracy when (most of) the ambiguities are fixed.
Hongyang Ma +4 more
openaire +4 more sources
Review of PPP–RTK: achievements, challenges, and opportunities
Satellite Navigation, 2022 AbstractThe PPP–RTK method, which combines the concepts of Precise of Point Positioning (PPP) and Real-Time Kinematic (RTK), is proposed to provide a centimeter-accuracy positioning service for an unlimited number of users. Recently, the PPP–RTK technique is becoming a promising tool for emerging applications such as autonomous vehicles and unmanned ...
Xingxing Li +6 more
openaire +6 more sources