Global Positioning System Reference
In-Depth Information
The following four examples are used to illustrate this operation. These four
cases include the first phase transitions occurring at 0, 7(
<
10), 10, and 17(
>
10),
which covers all the possible cases.
In Figure 9.6a the first phase transition occurs at 0 point and the data are
padded with 21 points. The first
π
phase shift determines the first navigation
data point. The beginning of subframe 1 is at the 100th navigation data point
FIGURE 9.6
Relations among the beginning of the C/A code, first navigation data point,
and beginning of subframe 1.
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