Global Navigation Satellite Systems Engineering, Policy, and Design
The European Space Agency officially announced testing of Galileo’s Open Service Navigation Message Authentication (OSNMA) in its signal-in-space, allowing the first OSNMA-protected position fix to be successfully computed. This is the first-ever transmission of authentication features in open signals of a GNSS.
By Inside GNSS
A new approach to facilitate fast and/or reliable reception and decoding of the navigation message in harsh radio propagation conditions derives from digital communications. Link-layer coding (LLC) techniques improve times-to-first-fix (TTFFs) over legacy carousel transmissions and achieve near-optimal performance with a limited complexity increase.
The value of the GPS SPS PS goes far beyond the specific parameters that it contains. It has a great deal of information regarding how GPS operates and ideally should be read in full (including the appendices) by everyone who works with GPS at the measurement level.
Inertially-aided extended coherent integration makes a GNSS receiver more sensitive to directly received signals than to reflected signals whenever the receiver is moving. 3D-mapping-aided GNSS uses predictions of which signals are NLOS to enhance the positioning algorithms. Both techniques can improve positioning accuracy in dense urban areas by more than a factor of two. This article investigates the benefits of combining them.
By Inside GNSS
By Logan Scott
The U.S. Department of Transportation’s (DoT’s) “Complementary PNT and GPS Backup Technologies Demonstration Report” released this January has some excellent data on the relative performances of various systems in timing and positioning.
By Inside GNSS
On March 3 a Galileo Performance Workshop, open to anyone interested in GNSS and led by the European GNSS Agency (GSA), will offer an in-depth analysis of the performance of the Galileo constellation and signals and how they are evaluated for users.
By Inside GNSS
The European Navigation Conference and the Royal Institute of Navigation’s (RIN’s) International Navigation Conference are one and the same in 2021. They convene jointly and virtually as Navigation 2021, from November 15 to 18.
By Inside GNSS
Alternative PNT from low-Earth orbit (LEO) satellites is being developed or proposed by various entities. Satelles delivers a fully operational Satellite Time and Location (STL) service to back up or augment GNSS, strengthening the resilience of critical infrastructure. This article details STL’s timing synchronization performance with different types of user equipment.
Honeywell announced that recent findings from its research labs show that its newly developed inertial sensors can deliver greater than an order of magnitude improvement in accuracy over its current tactical-grade product, the HG1930 inertial measurement unit (IMU).
By Inside GNSS
The Air Force Research Laboratory’s Air Force Office of Scientific Research awarded 17 quantum information research science grants in late 2020, two of them with a focus on the use of quantum computing to overcome challenges in GPS-denied navigation.
By Inside GNSS
A software development kit for vertical positioning within multistory buildings enhances first responder safety, makes decision-making more efficient, and improves situational awareness.
By Inside GNSS
In an Android developers’ blog post titled “Improving urban GPS accuracy for your app,” satnav expert and a principal engineer at Google Frank van Diggelen reports that the company has addressed “the last great unsolved GPS problem”: the wrong-side-of-the-street position error.
By Inside GNSS
On Monday, December 14, the EU’s Galileo program posted an official notice advising users that Galileo service was degraded on all satellites until further notice. Nominal service was then resumed about six hours later.
By Peter Gutierrez