
Chapter 10 257
GPS Modulation
GPS Concepts
GPS Concepts
Signal Generation Block Diagram
Figure 10-1 shows how the GPS signal is generated within the ESG. Notice that the C/A code
is modulated onto the L-band signal using the I axis of the I/Q modulator, and the P code is
modulated using the Q axis. The data provided by the data generator is selected by using the
Data softkey or by choosing the TLM mode.
Figure 10-1 GPS Signal Generation Diagram
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