Global Navigation Satellite Systems Engineering, Policy, and Design
The DOD’s Defense Spectrum Office (DSO) recently contracted iPosi and Virginia Tech Applied Research Corporation (VT-ARC) to develop a GPS/GNSS system that measures radio frequency (RF) path-loss, with the goal of increasing shared spectrum without interference.
By Inside GNSS
Intelligent Material Solutions (IMS) is taking a new approach to helping the blind and visually impaired (BVI) navigate in cities and other environments, using a technology that dovetails on GPS to provide more precise geo-location.
By Renee Knight
Through a collaborative agreement, Satelles will provide its Satellite Time and Location (STL) PNT service to the U.S. National Institute of Standards and Technology (NIST), expanding precision timing distribution options for critical infrastructure.
By Renee Knight
Tallysman recently added eXtended Filtering (XF) to its line of VeroStar® housed and embedded precision GNSS antennas. The XF feature is designed to mitigate interference from all near-band signals.
By Inside GNSS
A factor-graph optimization-based GNSS positioning method uses GNSS pseudorange and Doppler observations to estimate position, velocity, and receiver clock biases. Added constraints on past and current graph nodes of the graph using time-difference observations of the GNSS carrier phase improve the accuracy, and a robust optimization method excludes multipath outliers. Experimental results reduce horizontal positioning error from 5 to 10 meters to 1.37 meters.
By Inside GNSS
This research derives effective formulas relating GNSS meta-signal observations to the measurements obtained from its side-band components, when processed independently in a standard receiver architecture. Meta-signal processing can lead to high-accuracy solutions even under harsh conditions.
By Inside GNSS
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
The European Geostationary Navigation Overlay Service (EGNOS) will soon launch a new maritime solution that will make legacy and costly coastal ground-based augmentation systems redundant. Meanwhile, the next generation EGNOS V3, featuring dual-frequency, multi-constellation (DFMC) services, is set to come online by 2028, once GPS L5 is declared operational.
By Peter Gutierrez
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
The concept of autonomous driving has generated a lot of interest and attention in the past decades as it is believed to provide numerous benefits for individuals and society: increased road safety, reduced traffic congestion, accidents and death, and saving time and pollution on commuting. There is a lot of ongoing work on this topic, much research and many experiments have been conducted on how to make cars learn the environment, make human-like decisions and drive on their own.
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.)
With the integration of the Trimble RTX GNSS correction services platform with Snapdragon® 8 Gen 1 and Snapdragon 888 Mobile Platforms from Qualcomm Technologies, Android phone users now have access to more precise positioning for navigation, lane-level guidance and ridesharing pick-up destinations.
By Inside GNSS
With the company’s latest 5G data card release, Telit is offering OEMs and systems integrators a solution that supports new latency-sensitive applications.
By Inside GNSS
