GLONASSARY

Dual frequency This term refers to a navigational receiver capable of using L1 and L2 satellite frequencies to derive a position. Until recently L2 satellite frequency access was restricted to governmental use only. Dual frequency receivers merely observed L2 frequencies and matched the wave lengths of them to an internally generated pseudo-random code. The time taken to sync the wave lengths was proportional to the distance of the receiver from the satellite and allowed for increased accuracy. With GPS Modernization, a new L2C signal is being broadcast on the L2 frequency from approximately 1/3 of operational satellites; this number will increase. Dual frequency receivers capable of interpreting the L2C signal are considered true dual frequency receivers.

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