Global Positioning System Reference
In-Depth Information
GPS receivers. In both the approaches, a fundamental role is played by the tracking stage
whose aim is to continuously refine the misalignment between the incoming signal and the
local replica in order to perform the code de-spreading and retrieve the navigation data. On
the basis of the local code evolution, GNSS receivers measure code phase delays,
implementing a set of time-counters that accumulate the number of processed frames,
subframes, data bits, code periods and samples for all the tracked satellites. The presented
theory is completed by a real data example of PVT, in case of a joint processing of
GPS/Galileo signals, exploiting code-phase pseudorange measurements.
7. References
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