The first of the three GLONASS-M satellites to be launched on September 2 has arrived at the Baikonur Cosmodrome in Kazakhstan. GLONASS vehicle No. 37 (to be known as 737 on launch) arrived on a transport plane from Krasnoyarsk on July 26. Ground testing of the satellite is already underway. The...More>>

News By: Oliver Montenbruck, André Hauschild, Peter Steigenberger, Richard B. Langley

A small variance in the L5 signal, which remains well within signal specifications and will not affect pseudorange measurements, may show some impact on triple-frequency combinations of the signal’s carrier phase in high-precision applications. Observations suggest a temperature-dependent line...More>>

News By: Don Jewell

Researchers at the German Aerospace Center say they have found a small variance in the L5 signal on IIF-1. The signal variation results in no more than a 5-centimeter error with a predictable periodicity of about six hours. The GPS Wing is studying the issue and expects to resolve it before setting...More>>

Article By: Alan Cameron

On February 8, the United States began shutting down its 20-odd Loran transmitters. The International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA), of which the United States is a member, continually recommends the use of eLoran as back up for GNSS, and is moving...More>>

Article By: Don Jewell

As he retires from the Air Force, Col. Dave Madden gives a status update on GPS modernization and outlines four steps the GPS Wing is taking to ensure worldwide PNT services are not interrupted during modernization, exploring a more robust means of ensuring compatibility, and becoming more involved...More>>

Article By: Alan Cameron

The European Commission rang up the other day, concerned that a recent column contained misperceptions about the Galileo Open Service Signal-in-Space Interface Control Document (ICD). I replied that if misperception exists, it is shared by at least some in industry.Though the EC has abandoned a...More>>

The NoiseWave NW-ATE series noise generator, covering from 10 MHz up to 40 GHz in bands, is designed for test applications including noise, interference, and jamming for GPS receivers and component testing. The rugged instrument is fully programmable from the front panel and remotely via GPIB and...More>>