GPSWorld, July 2013, "2C or Not 2C: The First Live Broadcast of GPS CNAV Messages"

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2C or Not 2C: The First Live Broadcast of GPS CNAV Messages

By Oliver Montenbruck, Richard B. Langley, and Peter Steigenberger

Over the past several years, some users of the GPS navigation system have already benefitted from the addition of various new signals in addition to the legacy C/A- and P(Y)-code. With the introduction of the Block IIR-M satellites in 2005, a new civil signal (L2C) was transmitted on the L2 frequency, and a new signal on a new frequency (L5) was introduced as a standard signal with the Block IIF satellites beginning in 2010. These new signals provide direct access to dual-frequency observations and thus enable improved ionospheric corrections for civil, including aeronautical, users. In addition, a new Civil Navigation (CNAV) broadcast message has been defined in the GPS Interface Specifications (IS-GPS-200 and IS-GPS-705).

Full article: 2C or Not 2C: The First Live Broadcast of GPS CNAV Messages

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