Chapter 8 211
GPS Modulation (Option 409)
Real Time GPS
Real Time GPS Introduction
Signal Generation Block Diagram
Figure 8-3 shows how the GPS signal is generated within the PSG. Notice that the C/A code modulates the
L-band signal using the I axis of the I/Q modulator, and the P code modulates the L-band signal using the Q
axis. Select the data provided by the data generator using the
Data softkey or by choosing the TLM data
mode.
Figure 8-3 GPS Signal Generation Diagram
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