August 8, 2022
Protecting GNSS for Safe Aviation
Detecting interference using machine learning algorithms to monitor ADS-B data.
By Inside GNSS
Global Navigation Satellite Systems Engineering, Policy, and Design
Global Navigation Satellite Systems Engineering, Policy, and Design
Detecting interference using machine learning algorithms to monitor ADS-B data.
By Inside GNSS
The European Space Agency’s new navigation head, Francisco-Javier Benedicto Ruiz, has a lot to say about GNSS, both present and future. We recently spoke with him about his views on satellite navigation, signal vulnerability and authentication, and the agency’s working relationship, or not, with Russia. The technical team behind the Galileo authentication service and industry representatives developing alternative positioning, navigation and timing solutions also share insights.
By Peter Gutierrez
As guest columnist Dino Smajlovic explains, testing allows for inertial error characterization and understanding, ensuring proper error budgets and more accurate navigation solutions. Rate tables are among the tools used, with some allowing testing, characterizing and modeling in one installation step.
By Inside GNSS
RTCA is working to develop new standards to tackle GNSS growth and challenges. Here’s an update on the special committee’s progress, provided during a recent webinar.
By Dawn M.K. Zoldi (Colonel, USAF, Ret.)
GMV Aerospace and Defense has developed a system for a pan-European, public time distribution. At the recent AltPNT Demonstration Day at the European Commission’s Joint Research Center (JRC), Ricardo Píriz, from GMV AD’s GNSS Time and Frequency Group, explained how his company can provide Galileo System Time (GST) or Galileo UTC via existing networks.
By Peter Gutierrez
Errors in inertial sensor measurements are accumulated over time, leading to drift in INS navigation outputs. While gyro bias is the main contributor, other factors, such as accelerometer bias and noise, are important to consider for balancing the overall error budget.
By Andrey Soloviev
Xona Space Systems recently launched a test satellite on SpaceX’s Transporter 5, aiming to display high-quality commercial PNT Low Earth Orbit (LEO) signals from a payload suitable for small satellite deployment—and Hexagon | NovAtel has announced support of those efforts.
By Renee Knight
Robustness to GPS jamming and spoofing is critical for military applications yet challenging, and numerous alternative sensing techniques have been explored over the years. Virtual aiding methods have proven effective, with the ability to constrain and localize the search space for improved operability in GPS-denied environments.
By Inside GNSS
Will the network, which some are still fighting, be ready for a September rollout, and if so, what are the implications for GPS and the people who rely on it?
By Dawn M.K. Zoldi (Colonel, USAF, Ret.)
The NaviMoon satnav receiver is designed to perform lunar positioning using signals from GNSS satellites in Earth orbit. The test version of this unique receiver has been delivered for integration testing onboard the Lunar Pathfinder spacecraft.
By Peter Gutierrez
In this second column we consider fundamental principles of inertial navigation that derive position, velocity and angular orientation from measurements of accelerometers and gyroscopes.
By Andrey Soloviev
A novel method for improving the positioning accuracy of GNSS receivers exploits a machine learning (ML) algorithm. The ML model uses the post-fit residuals, which are readily available after the position computation from the position, velocity and timing (PVT) engine, adoptable by existing receivers without requiring any modification. The performance of this method, demonstrated using data collected with mass-market receivers as well as a Google public dataset collected with Android smartphones, shows the practicality of the concept.
By Inside GNSS
Warfighting systems rely on GPS to provide cyber-secure and accurate positioning, navigation and timing (PNT). A recent Department of Defense Operational Test and Evaluation (DOT&E) report examined, along with all U.S. tactical weaponry, the adequacy of current GPS equipment, test strategies and plans for future operational effectiveness. It found some causes for concern.
By Dawn M.K. Zoldi (Colonel, USAF, Ret.)
