There are five different frequencies used in GPS. All these frequencies are within the L-band.
Remark:
o During the years the satellites became more and more sophisticated and meanwhile five different types of these satellites exist (Block I, Block II, Block IIA, Block IIR und Block IIF).
o Block IIF satellites are the fourth generation of GPS satellites.
o The GPS Block III is an initiative of the US Air Force intended to meet the requirements for satellite-based navigation and timing capabilities over the next 30 years.
o The first Block IIR-M satellite was launched in 2005. Block IIR-M satellites are a “modernized” version of Block IIR.
o L2 Civil (L2C) is a new GPS signal for civilian use on the L2 carrier frequency. Only newer GPS satellites (block IIR-M or later) are able to broadcast this signal.
o L1 Civil (L1C) is the multiple open signals that broadcast within the L1 frequency band.
Global Positioning System (GPS) 
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