| measuring distance |

Distance is measured in four steps. Firstly distance to a satellite is determined by measuring how long a radio signal takes to reach us from that satellite. For this 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.

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