USAF's New Reference System
How do you tell when close is close enough? That depends. If you’re referring to a friendly game of horseshoes the answer could be several feet. However, if it’s the United States Air Force’s new-generation “gold standard” for GPS test capability — the Ultra High Accuracy Reference System — the answer is “mere centimeters.” This article describes the operational requirements, design, installation, and demonstration testing of the non-GPS–based positioning system (NGBPS)subsystem of the UHARS for the Central Inertial and GPS Test Facility in New Mexico.
Compliance and Certification
What emerged during the LightSquared controversy as an effort to protect GPS spectrum has evolved into a wider discussion about receiver standards and certification. But its not the first time the latter subject has come up. In the following commentary, a long-time GPS policy expert suggests an approach to framing the issue.
Digital versus Analog
Where do GLONASS inter-frequency carrier phase biases in GNSS receivers come from? The authors show that the well-known decimeter-level linear biases affecting GLONASS carrier phase measurements are a function of the digital signal processing methods used in receivers.
Encroaching upon the commonwealth of GNSS
people have tried to reinvent the wheel, but no one has gotten into a patent
fight over it.
The U.S. Patent and Trademark Office (USPTO) is weeks away from approving a controversial British patent that could force American consumers to pay more for navigation devices and affect the operations of the American military.
Does Indoor Carrier Phase Tracking Allow Indoor RTK?
Difference correlators represent effective means to remove signal dynamics from correlator values and to dramatically increase the coherent integration time, thus, also increasing the carrier phase tracking sensitivity. In tests described here, a difference correlator software algorithm shows promising results both indoors and in a forested area.
Sierra Nevadas grow and Venice sinks, GLONASS-K testing, traffic updates, jamming, ships at sea and more
In this issue: GPS and InSar together tell more about Venice and the Sierra Nevada range, GLONASS-K testing delayed, Indian airports to install GAGAN, North Korea jams GNSS, Chinese fishing boats use Compass, SatNavs for elderly drivers
The Challenges of Diversity
With GNSS, the more, the merrier — true or false?