Global Navigation Satellite Systems Engineering, Policy, and Design
NTS-3 Satellite Prepares for Launch to Experiment with Ways to Improve GPS.
Nearly 50 years ago, there were no smart phones, no GPS-guided weapons, no turn-by-turn direction systems in automobiles.
By Brett Davis
For years, the U.S. Department of Transportation (DOT) has been exploring the technologies and systems necessary to provide positioning, navigation, and timing (PNT) services to complement the Global Positioning System (GPS) so that these critical services remain available even when GPS signals are disrupted. In the past few months, the department has ramped up these Complementary PNT (CPNT) efforts, from its issuance of a CPNT Action Plan in September to a related Request for Information (RFI) seeking industry input on CPNT technologies. What are these efforts, how are they going and why the sense of urgency now?
By Dawn M.K. Zoldi (Colonel, USAF, Ret.)
SpaceX recently signed an agreement with the European Space Agency (ESA) to launch four Galileo satellites on its Falcon 9 rocket next year.
By Inside GNSS
The European Space Agency (ESA) is calling for proposals for missions to the Moon that can leverage existing resources such as Moonlight program lunar communications and navigation services.
By Peter Gutierrez
GBAS corrections are typically only used for precision approaches of large aircraft. This study tests using GBAS corrections and integrity parameters for UAVs.
By Inside GNSS
A look at NTCM-G, a new Ionospheric model fully compatible with the Galileo Open Service.
By Inside GNSS
In the past decade, there has been a sharp increase in GNSS outages due to deliberate GNSS jamming. Receivers in LEO are uniquely situated to detect, classify and geolocate terrestrial GNSS jammers. This article explores two-step and direct geolocation of terrestrial GNSS jammers from LEO.
By Inside GNSS
This research analyzes the wide-area 2022 Texas GPS jamming incident using data from airborne receivers through Automatic Dependent Surveillance – Broadcast (ADS-B) and ground receivers at Continuous Operating Reference Stations (CORS).
By Inside GNSS
The new blockchain-based, decentralized CORS reference network provides low-cost access to triple-frequency full-constellation correction signals for centimeter accuracy, while also allowing users to earn financial rewards for contributing qualified CORS data back to GEODNET.
By Renee Knight
Experimental and simulation results from Starlink, OneWeb, Orbcomm and Iridium LEO satellite constellations are presented, demonstrating the efficacy and tremendous promise of the proposed LEO-agnostic blind opportunistic navigation frameworks.
By Inside GNSS
The Joint Research Centre of the European Commission tested seven advanced alternative sources of positioning navigation and timing (A-PNT) platforms through a performance assessment campaign, proving there are viable alternatives to GNSS available in the commercial market today.
By Inside GNSS
SAM PULLEN STANFORD UNIVERSITY, FRANCESCO RISPOLI,
ALESSIA VENNARINI, ARIANNA PERSIA, RADIOLABS , ALESSANDRO NERI, ROMA TRE UNIVERSITY AND RADIOLABS, ROBERTO CAPUA SOGEI
A: Many augmentations of GNSS satellite navigation have been developed and fielded since the GPS constellation was completed and declared fully operational in 1995. The best known of these are satellite-based and ground-based augmentation systems (SBAS and GBAS), which are public systems designed to support civil aviation.
Recent bipartisan legislation aims to make satellite communication and PNT services more available to farmers.
By Brett Davis
