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Autonomous orbit determination and timekeeping in lunar distant retrograde orbits by observing X-ray pulsars
Jiangkai Liu, Wenbin Wang, Hao Zhang, Leizheng Shu and Yang Gao

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 687-708; DOI: https://doi.org/10.1002/navi.451
Open Access
A particle-filtering framework for integrity risk of GNSS-camera sensor fusion
Adyasha Mohanty, Shubh Gupta and Grace Xingxin Gao

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 709-726; DOI: https://doi.org/10.1002/navi.455
Open Access
Urban positioning: 3D mapping-aided GNSS using dual-frequency pseudorange measurements from smartphones
Hoi-Fung Ng, Guohao Zhang, Yiran Luo and Li-Ta Hsu

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 727-749; DOI: https://doi.org/10.1002/navi.448
Open Access
Study of structures of the sporadic E layer by using dense GNSS network observations
Susumu Saito, Keisuke Hosokawa, Jun Sakai and Ichiro Tomizawa

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 751-758; DOI: https://doi.org/10.1002/navi.454
Open Access
PPP/PPP-RTK open formats: Overview, comparison, and proposal for an interoperable message
Rui Hirokawa, Ignacio Fernández-Hernández and Simon Reynolds

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 759-778; DOI: https://doi.org/10.1002/navi.452
Open Access
A multi-frequency method to improve the long-term estimation of GNSS clock corrections and phase biases
A. Rovira-Garcia, J. M. Juan, J. Sanz, G. González-Casado, J. Ventura-Traveset, L. Cacciapuoti and E. Schoenemann

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 815-828; DOI: https://doi.org/10.1002/navi.453
Open Access
First results from three years of GNSS interference monitoring from low Earth orbit
Matthew J. Murrian, Lakshay Narula, Peter A. Iannucci, Scott Budzien, Brady W. O’Hanlon, Mark L. Psiaki and Todd E. Humphreys

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 673-685; DOI: https://doi.org/10.1002/navi.449
Open Access
Positioning with medium frequency R-Mode
Lars Grundhöfer, Filippo Giacomo Rizzi, Stefan Gewies, Michael Hoppe, Jesper Bäckstedt, Marek Dziewicki and Giovanni Del Galdo

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 829-841; DOI: https://doi.org/10.1002/navi.450
Open Access
Improved high-precision GNSS navigation with a passive hydrogen maser
Thomas Krawinkel and Steffen Schön

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 799-814; DOI: https://doi.org/10.1002/navi.444
Open Access
Advanced and versatile signal conditioning for GNSS receivers using the high-rate DFT-based data manipulator (HDDM)
Johannes Rossouw van der Merwe, Fabio Garzia, Alexander Rügamer and Wolfgang Felber

NAVIGATION: Journal of the Institute of Navigation December 2021, 68 (4) 779-797; DOI: https://doi.org/10.1002/navi.441

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