218 Chapter 8
GPS Modulation (Option 409)
Real Time GPS
Figure 8-7 Real Time GPS Setup with External Clock
This procedure used an external source as the reference clock signal. The reference frequency was changed
from the GPS standard of 10.23 Mcps to 11.03 kcps. This change in the reference signal frequency
automatically changed 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; the C/A code rate is one-tenth of the reference frequency and so is
now 1.103 kcps. For more information on the GPS option, refer to “Real Time GPS” on page 210.
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