| Measuring the time taken for a minimum number of satellites' transmissions, in known positions, to reach the aircraft's receiver |
| Measuring the pulse lengths of signals received from a minimum number of satellites received in a specific sequential order |
| Measuring the time taken for an aircraft's transmissions to travel to a number of satellites, in known positions, and return to the aircraft's receiver |
| The aircraft's receiver measuring the phase angle of signals received from a number of satellites in known positions |
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