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 In Review: Measuring Distance
- Distance to a satellite is determined by measuring how long a radio signal takes to
reach us from that satellite.
- To make the measurement we assume that both the satellite and our receiver are
generating the same pseudo-random codes at exactly the same time.
- By comparing how late the satellite's pseudo-random code appears compared to our
receiver's code, we determine how long it took to reach us.
- Multiply that travel time by the speed of light and you've got distance.
On to the Next Section |
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