Lab, Live, and LightSquared
In a tightly compressed timeline, the Technical Working Group established under a Federal Communications Commission order designed and conducted extensive tests assessing the likely effects of LightSquared transmissions on GPS. But how were those tests — many of them using signal generators and constellation simulators as well as live over-the-air transmissions — actually carried out and how should we interpret the results? This article will tell you.
Issues and Perspective
Russia’s GLONASS is adding new CDMA signals, renewing interest in its use for civil aviation in combination with other GNSSes. Here, a member of an international engineering team describes their work on an integrated GLONASS/Galileo/GPS aviation receiver that can process the new Russian L3 CDMA signal.
of a Multi-GNSS RF Signal Simulator
GNSS signal and constellation simulators are crucial tools for designing and testing GNSS user equipment. But how does one test the test equipment itself? The authors explain how they verified the performance of a software simulator developed at Beihang University in Beijing.
The Washington View
Faced with overwhelming evidence that its wireless broadband system would jam GPS receivers, hedge fund-backed LightSquared redirects its efforts towards Congress.
Preparedness for the next attack
The GPS community needs a continuing, effective organization to prepare for the next attack on its hard-won equities.
Aerospace and Formation Flying
Can a GNSS receiver capable of tracking carrier phase signals estimate a platform’s orientation precisely? This column introduces a new ambiguity-attitude estimator, in which ambiguity resolution and attitude estimation are coupled and resolved in an integral manner.
GNSS Data Points and Factoids to Amuse and Inform
In this issue: Aquarius, privacy rights in Washington, SVN-63, Natalia's satellite and Rickshaw Wars in New Delhi
In one form or another, inertial technologies preceded the advent of GNSS by many decades. Today, GNSS has captured the spotlight: But is there room — and a need — for more?