Global Navigation Satellite Systems Engineering, Policy, and Design
Mike Rogers, a key lawmaker in military space policy, appears willing to stick with the current program to build a more capable and cyber-secure GPS ground system despite his profound frustration with schedule delays and cost overruns and a recently revealed report from MITRE Corp. suggesting it be dropped.
By Dee Ann Divis
Integrity for Navigation Land Users (INLU) addresses the difficult task of adapting air-based position integrity solutions to land-based activities such as vehicle and rail travel.
By Inside GNSS
This year’s Munich Satellite Navigation Summit featured pointed debates on high accuracy, integrity and authentication, exploring the trade-off between GNSS performance and security. And, as usual, there were some new products and systems looking to make a splash.
By Peter Gutierrez
GNSS positioning is premised on the idea that the satellite positions are known, or can be calculated. Errors in the computed satellite position will manifest as ranging errors that degrade the positioning accuracy.
By Mark Petovello
The federal government is rumored to be nearing a decision about Ligado Networks’ request to repurpose its satellite frequencies to also support a ground-based telecom network. Those frequencies neighbor the band used by GPS. Testing done both several years ago and more recently has shown such a system could seriously interfere with GPS receivers.
By Dee Ann Divis
Authors: Frank van Diggelen and Mohammed Khider
Google has publicly released GNSS Analysis Tools to process and analyze GNSS raw measurements from your phone. These tools enable manufacturers to see in detail how well the GNSS receivers are working in each particular phone design and thus improve the GNSS design and performance in their phones. Also, with the tools publicly available there is significant value for app-developers, researchers and educators. Here, the authors show what these tools do, and how they reveal details of receiver and signal behavior that are not possible to observe without raw measurements.
