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of signals from one transmitter to multiple receivers or vice versa
* Partly also velocity, e.g. by means of radio Doppler shift.

Combinations of these measurement principles also are important--e.g., many radars measure range and azimuth of a target.

Bearing-measurement systems

These systems used some form of directional radio antenna to determine the location of a broadcast station on the ground. Conventional navigation techniques are then

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