Real-time Shadow Matching Using GNSS and 3D City Models
When life gives you lemons, make lemonade. This article presents a smartphone-based system that uses the GNSS signal “shadows” cast by buildings to improve the accuracy of street-level positioning.
GPS/BeiDou/INS Performance in Two Hemispheres
A series of road trials in China and Australia uses a new integrated navigation system that fuses GPS, BeiDou and MEMS inertial sensors. An analysis of various distributions of satellites in the constellations reveals the influence of the two GNSS systems’ satellite geometry on real-time positioning.
This Scottish engineer says getting the balance right between working on
a demanding satellite mission alongside the no less challenging job of
being a mum is an ongoing process.
Precisely because it is finite, radio frequency spectrum is valuable. Can public good hold its own against commercial pressures? Will competition drive GNSS in search of other frequencies.
Déjà Vu All Over Again
The real GNSS danger from Russia is protectionism, not espionage.
A successful attack on the GPS system could be particularly damaging because so many critical networks rely on its signals and on each other. Consequently, a great deal of attention is being given to its security.
A Tale of Two Cities
EC Vice-President Antonio Tajani called directly on ESA Director-General Jean-Jacques Dordain to explain why the latest Galileo launch delay was not anticipated and what ESA intends to do about it.
Low-Cost, Single-Frequency GPS/GLONASS RTK for Road Users
Can low-cost, single-frequency receivers provide real-time RTK-level performance for road users?
In this issue: The End of Nautical Charts, Litigious LightSquared, GPS Fungicide, Time to Turn to Crime, and 24,000 Ideas
What does it mean for GNSS?
Growing pressure on a limited resource is squeezing users and giving rise to proposals for “sharing” spectrum. Will GNSS be lost in the noise?