Global Navigation Satellite Systems Engineering, Policy, and Design
This article reviews some of the recent results analyzing the feasibility of carrier-phase based positioning with smartphone data and highlights limitations largely arising due to the poor antenna quality. It shows how they might be overcome by antenna calibration or coupling to the phone’s inertial sensors. The goal is to perform a successful RTK positioning with the smartphone-quality data.
Discussions about spectrum allocation, familiar to GNSS designers and manufacturers on Earth, are now taking place regarding the lunar environment. ITU Radio Regulations constitute an international treaty governing all radio frequency activities. This article shows that GNSS operators in this region must transmit signals in the GNSS S-band rather than in GNSS L-bands.
A new method for multipath rejection employs a multicorrelator-based GNSS receiver with an extended Kalman Filter (EKF) as an iterative solver, replacing the conventional delay locked loop (DLL) code tracking. The technique significantly reduces the positioning error and has low complexity. It can therefore be implemented in a real-time processing environment.
The U.S. Army Research Lab awarded the University of Central Florida a $4.5 million grant to develop a smart, computer vision-based navigation system for when GPS is unavailable or jammed.
By Inside GNSS
The EU Agency for Space Programme (EUSPA) awarded Thales Alenia Space a contract to provide new capabilities to the European Geostationary Navigation Overlay Service (EGNOS) satellite-based augmentation system.
By Inside GNSS
Ionospheric delay is the largest source of range error for GPS Standard Positioning Service (SPS) users, at least during local daytime when solar emissions enhance these delays.
By Inside GNSS
Europe’s Certifiable Localisation Unit with GNSS in the railway environment (CLUG) has moved the continent towards a cost-efficient train tracking solution based on satellite technology together with other sensors and data.
By Inside GNSS
Collins Aerospace announced its Military Underwater Navigation System with M-Code (MUNS-M), a handheld diver navigation system that provides the diver with precise position and includes secure anti-jamming capabilities during deep-sea missions.
By Inside GNSS
Ligado Networks had an early-year win in the form of a Federal Communications Commission denial of the National Telecommunications and Information Administration Stay Petition involving Ligado’s license for a terrestrial service in the mobile satellite services L-band. The company continues to roll toward deployment of a nationwide 5G network. While filings trickle in from the private sector, the feds work quietly behind the scenes on Congressional due-outs. In short, wheels big and small keep churning down the river to 5G.
By Dawn M.K. Zoldi (Colonel, USAF, Ret.)
Using in situ sensors, GNSS corrections and satellite remote sensing, it is possible to obtain information on soil anomalies, enabling farmers to take corrective actions in the field. This information is given through a pre-set field map which identifies areas needing a specific treatment, leading farmers to an improved cost-benefit ration for their agricultural crops.
By Inside GNSS
ADVA announced that Portland General Electric (PGE) is deploying Oscilloquartz PTP grandmaster clock technology, incorporating multi-band GNSS receivers, as it upgrades to packet-based synchronization and protects its network against GNSS vulnerabilities and cyberattacks, while conforming to PNT Executive Order 13905.
By Inside GNSS
A 2023 lander in the moon’s Mare Crisium will carry the first GNSS receiver to that planet’s surface: the Navigation Early Investigation on Lunar surface (NEIL) receiver with software-defined radio (SDR) technology. The receiver will spring from agreements between the U.S. National Aeronautics and Space Administration (NASA), the Italian Space Agency (ASI) and the Italian firm Qascom srl.
By Inside GNSS
Galileo satellites 5 and 6 (E18, E14) were declared unusable in February 2021 after reports indicating repeatable daily problems with RTK. This article explores the possible impact of deviant elliptical orbits on the performance of RTK and finds that there is no reason to expect any anomalies caused by high orbit eccentricity per se. Thus there is no reason to declare the satellites unhealthy.
