OOIR: Observatory of International Research

Papers

(The H4-Index of GPS Solutions is 27. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-04-01 to 2025-04-01.)

Article	Citations
Estimation and universal formulation approach of BDS-3/GNSS inter-frequency bias	85
Interannual variability of vertical land motion over High Mountain Central Asia from GPS and GRACE/GRACE-FO observations	82
New data processing methods for network RTK positioning: improving ionospheric uncertainty management during ionospheric scintillations	74
Study of a geodetic NavIC receiver for timing application	71
Impact and mitigation of neglecting PPP-RTK correctional uncertainty	70
A comprehensive evaluation of utilizing BeiDou data to estimate snow depths from two ground-based stations	63
Two modified multi-frequency GNSS approaches to estimate the pseudorange observable-specific signal bias for the CDMA and FDMA models	47
Toward BDS/Galileo/GPS/QZSS triple-frequency PPP instantaneous integer ambiguity resolutions without atmosphere corrections	47
Analysis of signal-to-noise ratio retrieved from multi-GNSS satellite data of land surface reflections	46
Equatorial plasma bubble detection based on GNSS Doppler index using support vector machine algorithm	45
Regional application of generalized regression neural network in ionosphere spatio-temporal modeling and forecasting	44
Machine learning approach for GNSS geodetic velocity estimation	42
From RTK to PPP-RTK: towards real-time kinematic precise point positioning to support autonomous driving of inland waterway vessels	42
Real-time regional tropospheric wet delay modeling and augmentation performance for triple-frequency PPP/PPP-IAR during typhoon weather	42
An improved global grid model for calibrating zenith tropospheric delay for GNSS applications	41
LSTM-based short-term ionospheric TEC forecast model and positioning accuracy analysis	39
A new model for vertical adjustment of precipitable water vapor with consideration of the time-varying lapse rate	38
Evaluation of real-time kinematic positioning performance of the BDS‑3 PPP service on B2b signal	35
Real-time monitoring of GPS flex power based on machine learning	35
On-the-fly ambiguity resolution method for pseudolite/INS integration based on double-difference square observations	32
Vehicle mounted single-antenna GNSS spoofing detection method based on motion trajectory	32
Method and performance of time holdover for RT-PPT receivers utilizing on-line estimation of clock parameters	32
GNSS-based precise orbit determination for maneuvering LEO satellites	31
M_FCB: an open‑source software for multi‑GNSS fractional cycle bias estimation	30
GNSS jammer localization in urban areas based on prediction/optimization and ray-tracing	30

Improving smartphone positioning accuracy by adapting measurement covariance with t-test on innovations	28
Deep reinforcement learning with robust augmented reward sequence prediction for improving GNSS positioning	27
Attitude estimation in challenging environments by integrating low-cost dual-antenna GNSS and MEMS MARG sensor	27