GLONASSARY

L2 / L2C refers to a frequency (1227.60 MHz) broadcast by GPS satellites that until recently contained only a super imposed P-code for government access only. Through GPS Modernization, a new L2C signal is being broadcast on the L2 frequency. This signal is accessible to civilians and approximately 8 satellites are equipped to broadcast the L2C signal currently; the full constellation of satellites (24 satellites) is expected to broadcast L2C by 2016. The benefit of the L2C for the end user is a stronger signal because it is broadcast at 1227.60 MHz (in the radio-frequency world, a smaller frequency number generally represents a more powerful frequency.) The stronger signal will minimize error due to obstructions and multipath as well as reducing the amount of power needed by the GPS unit to receive the signal, thereby increasing GPS reliability. In fact, a “GPS fix” may be determined in some indoor environments by utilizing L2C.

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