Results 11 to 20 of about 806 (126)
A Novel Un-differenced PPP-RTK Concept [PDF]
Journal of Navigation, 2011 In this contribution, a novel un-differenced (UD) (PPP-RTK) concept, i.e. a synthesis of Precise Point Positioning and Network-based Real-Time Kinematic concept, is introduced. In the first step of our PPP-RTK approach, the UD GNSS observations from a regional reference network are processed based upon re-parameterised observation equations ...
Zhang, B. +2 more
openaire +3 more sources
GNSS augmentation services for large-area PPP-RTK [PDF]
, 2023 Scientific Technical Report STR ; 24 ...
openaire +5 more sources
A PPP-RTK APPROACH TO MASS-MARKET APPLICATIONS
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 Abstract. PPP-RTK has been widely investigated to take the advantages of both real-time kinematic (RTK) and precise point positioning (PPP) techniques. Prior to PPP-RTK, the conventional RTK based on the use of a single base station, on the one hand, has been extended to work within a regional network of multiple base stations, known as network RTK ...
Y. Gao, Y. Zhang, Z. Lyu
openaire +3 more sources
The Influence of Zenith Tropospheric Delay on PPP-RTK [PDF]
Journal of Applied Engineering Sciences, 2016 Abstract The PPP technique is more and more used in different GPS precise application. The PPP precision is related to many factors and the most important are: the number of satellites, the ambiguity resolution, the ability to model the ionospheric and tropospheric delays, solid earth and ocean tides, relativistic effects and antenna ...
S. Nistor, A.S. Buda
openaire +1 more source
Almost-Instantaneous PPP-RTK Without Atmospheric Corrections
, 2022 AbstractAmbiguity resolution enabled precise point positioning (PPP-RTK) can provide fast, potentially even instantaneous, centimeter-level positioning results, given that the phase ambiguities are correctly resolved. Without external ionospheric corrections, a time-to-first-fix the ambiguities of around 30 min is often reported for GPS-only solutions.
Andreas Brack +2 more
openaire +4 more sources
Satellite-Clock Modeling in Single-Frequency PPP-RTK Processing [PDF]
Journal of Surveying Engineering, 2018 The real-time kinematic precise point positioning (PPP-RTK) technique enables integer ambiguity resolution by providing singlereceiver users with information on the satellite phase biases next to the standard PPP corrections. Using undifferenced and uncombined observations, rank deficiencies existing in the design matrix need to be eliminated to ...
Kan Wang +3 more
openaire +3 more sources
PPP-RTK considering the ionosphere uncertainty with cross-validation
Satellite Navigation, 2022 AbstractWith the high-precision products of satellite orbit and clock, uncalibrated phase delay, and the atmosphere delay corrections, Precise Point Positioning (PPP) based on a Real-Time Kinematic (RTK) network is possible to rapidly achieve centimeter-level positioning accuracy. In the ionosphere-weighted PPP–RTK model, not only the a priori value of
Pan Li +6 more
openaire +4 more sources
Oxidative Stress and DNA Epigenetic Modifications in Cancer: Mechanisms and Targeted Therapeutics
MedComm – Oncology, Volume 5, Issue 2, June 2026.Reactive oxygen species (ROS) modulate DNA methyltransferases (DNMTs), ten‐eleven translocation family proteins (TETs) and their cofactors, reshaping 5‐methylcytosine (5mC)/5‐hydroxymethylcytosine (5hmC)/5‐formylcytosine (5fC) landscapes and gene expression in cancer cells. In turn, epigenetic control of antioxidant and metabolic pathways feeds back on
Xishan Yang +7 more
wiley +1 more source
A Multi-Epoch Processing Strategy for PPP-RTK Users
, 2023 AbstractThe present contribution aims to address why the stochastic model of the PPP-RTK user-filter is misspecified, and how one can limit the precision-loss associated with user parameter solutions. By developing tools for measuring the stated precision-loss under existing formulations of the user’s Kalman filter, we propose an alternative ...
Khodabandeh, A +2 more
openaire +2 more sources
Integrity Monitoring of PPP-RTK Positioning; Part II: LEO Augmentation
Remote Sensing, 2022 Low Earth orbit (LEO) satellites benefit future ground-based positioning with their high number, strong signal strength and high speed. The rapid geometry change with the LEO augmentation offers acceleration of the convergence of the precision point positioning (PPP) solution.
Kan Wang 0005 +4 more
openaire +3 more sources