Global Navigation Satellite Systems Engineering, Policy, and Design
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
The European Agency for the Space Program (EUSPA) is moving forward with its rollout of the free Galileo high accuracy service (HAS). Speaking at the recent HAS Days event in Spain, EUSPA’s Carmen Aguilera said, “Galileo HAS is user driven, as is the case for all European space programs. Our goal is to make sure that the services we are delivering are tailored to meet the needs of the users and the industries that will employ them in their businesses.”
By Peter Gutierrez
The European Space Agency (ESA) low Earth orbit (LEO)-PNT satellite program, approved at last year’s (2022) ESA ministerial conference, will soon begin testing a mini-constellation of at least ten satellites, placed in orbit some hundreds of kilometers above the Earth’s surface. Conventional GNSS systems, like those used by Europe’s Galileo program, utilize medium Earth orbit (MEO) satellites, about 23,000 kilometers from Earth.
By Peter Gutierrez
The Pentagon has requested $1.3 billion in its fiscal 2024 budget for bolstering the GPS system, preparing new satellites for launch and moving to a new control system. The biggest changes will come with the new GPS IIIF satellites, still a few years away.
By Brett Davis
Space is a mess. That according to the European Space Agency (ESA), which estimates there are 36,500 pieces of space debris orbiting the earth of greater than 10cm in size, and one million pieces between 1cm and 10cm. The number of smaller yet still dangerous objects is too staggering to contemplate.
By Peter Gutierrez
Following on from the GEODE project, NAVGUARD is the EU’s 56-million-euro initiative aimed at providing a space- and ground-based surveillance system, as well as mobile PRS receivers and other innovative technologies to improve the integrity and resilience of the Galileo Public Regulated Service (PRS).
By Peter Gutierrez
Managed by FDC under the aegis of the Belgian, French, German, Italian and Spanish ministries of defence, GEODE the largest and one of the most ambitious defence cooperation projects launched under the umbrella of the European Commission’s European Defence Industrial Development Program (EDIDP).
By Peter Gutierrez
