GLONASSARY

L1 / L1C A frequency (1575.42 MHz) broadcast by GPS/GNSS satellites that is equipped with two super-imposed codes, the Coarse Acquisition (C/A) code for civilian use and the Precision code (P-Code) for military use only. Single frequency navigational receivers utilize the L1 frequency to derive a positional solution. The final signal upgrade as part of GPS Modernization will be L1C. The L1C signal will be super-imposed onto the L1 frequency, and it will be backwards-compatible with the current C/A-code. L1C will be established in order to overcome the deficiencies of the L1 C/A code. L1C will be interoperable with the Galileo (European Satellite Navigation System) L1 Open Service signal and possibly with the modernized GLONASS (Russian Satellite Navigation System), producing a truly international signal. Like L2C and L5, L1C has been designed with unique and innovative features to enhance its robustness for all users, especially in difficult operating environments. The projected launch of the first GPS satellite transmitting L1C could be as soon as 2013.

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