Results 41 to 50 of about 963 (157)

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 ...
Wang, Kan, Khodabandeh, Amir, Teunissen, Peter   +2 more
openaire   +2 more sources

Application of Atmospheric Augmentation for PPP-RTK with Instantaneous Ambiguity Resolution in Kinematic Vehicle Positioning

Remote Sensing
The long convergence time and non-robust positioning accuracy are the main factors limiting the application of precision single-point positioning (PPP) in kinematic vehicle navigation. Therefore, a dual/triple-frequency multi-constellation PPP-RTK method
Zhu-Feng Shao, Dun-Wei Gong, Zi-Yang Qu, Sheng-Yi Xu, Xiao-Ting Lei, Zhen Li   +5 more
doaj   +1 more source

Integration of Field Observations With Forward and Inverse Modeling for Tsunami Reconstructions Along the Fjord‐Dominated Coastlines of Northern Cascadia

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 7, July 2026.
Abstract Forward and inverse modeling techniques are often applied to paleotsunamis to reconstruct inundation parameters. The accuracy of both types of models can be influenced by geomorphology, particularly in areas such as northern Cascadia, where rocky headlands and fjords influence tsunami flow and the preservation of sedimentary deposits ...
Stephen E. Bartlett, Jessica E. Pilarczyk, Catherine R. Jeffries, Michaela Spiske, David Huntley, Roger MacLeod, Robert Weiss, Davin J. Wallace, Anthony Giang, Diana M. Allen, Peter T. Bobrowsky, Tseshaht (c̓išaaʔatḥ) First Nation   +11 more
wiley   +1 more source

Tightly coupled multi-frequency PPP-RTK/INS integration model and its application in an urban environment

Geo-spatial Information Science
The Precise Point Positioning-Real Time Kinematic (PPP-RTK) technique, which provides centimeter-level positioning with instantaneous ambiguity resolution, is considered as a potential tool for intelligent vehicle applications.
Hang Zhu, Yibin Yao, Xiongwei Ma, Qi Zhang   +3 more
doaj   +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, Teunissen, PJG, Psychas, D   +2 more
openaire   +2 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, Qitai Chen, YuJie Yu, Yi Zang, Rujia Zheng, Zhe Zhang, Shuaijun Lu, Li Zhou   +7 more
wiley   +1 more source

Accurate Ionospheric TEC Prediction With a Causal Attention Network at Northern EIA Crests

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract As the Sun approaches the peak of its 25th activity cycle, precise ionospheric forecasting has become increasingly challenging. Low‐latitude regions have emerged as a persistent bottleneck for space weather operations. Extensive evidence reveals that existing AI models exhibit significant performance degradation in these regions, demonstrating
Tong Liu, Wu Chen, Zexin Lu, Wenlong Zhang, Yuhang Lu, Feng Wang, Mengfei Sun, Wenfeng Nie, Junsheng Ding, Yufang He, Bo Chen   +10 more
wiley   +1 more source

A New Strategy for Improving Multi‐Frequency PPP‐RTK Ionospheric Correction Availability and User Performance in Low‐ and Middle‐Latitudes

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract High‐precision regional ionospheric correction products are essential for achieving accurate and fast‐convergence solutions in Precise Point Positioning Real‐Time Kinematic (PPP‐RTK). For users in low‐ and middle‐latitudes, PPP‐RTK server narrow‐lane (NL) ambiguity resolution (AR) typically requires more than 10 min, which largely affects the ...
Pan Li, Shitong Chen, Jiahuan Hu, Xin Xie, Jiadi Dai, Bao Shu, Guanwen Huang   +6 more
wiley   +1 more source

MSE-impact of PPP-RTK ZTD estimation strategies

Advances in Space Research, 2018
In PPP-RTK network processing, the wet component of the zenith tropospheric delay (ZTD) cannot be precisely modelled and thus remains unknown in the observation equations. For small networks, the tropospheric mapping functions of different stations to a given satellite are almost equal to each other, thereby causing a near rank-deficiency between the ...
Wang, K. (author), Khodabandeh, A. (author), Teunissen, P.J.G. (author)   +2 more
openaire   +5 more sources

RTK-Quality Positioning With Global Precise Point Positioning Corrections

Navigation, 2023
Global navigation satellite system (GNSS) precise point positioning (PPP) has potential as an alternative or replacement for real-time kinematic (RTK) processing.
Nacer Naciri, Sunil Bisnath
doaj   +1 more source