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264 Chapter 10
GPS Modulation
GPS Operation
NOTE The chip rate of the external source must match the chip rate value set using
the GPS Ref (f0) softkey.
Figure 10-5 on page 264 shows what the signal generator display should look like after all the
steps have been completed. The CA Chip Rate, P Chip Rate, GPS Ref (f0), and GPS Ref
Clk fields, in the status area of the display, show the new parameters for this external
reference procedure. Notice the settings Satellite ID, Doppler Shift, Data, and
Data Mode, reflect the steps in the previous procedure, “Setting Up the GPS Signal” on
page 262.
Figure 10-5
This task supplied an external source for use as the reference clock signal. In addition, the
expected reference frequency was modified from the GPS standard of 10.23 Mcps to
11.03 kcps. This change in the reference signal frequency also affects the P and C/A code chip
rates. Since the P code chip rate matches the reference frequency, its chip rate is now
11.03 kcps and the C/A code, which is one-tenth of the reference frequency, is now 1.103 kcps.
For more information on the GPS option, refer to “Option Overview” on page 256.
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