| 摘要 |
A, B, and C are three radio-stations of known position and X a radio-station of unknown position, X emits continually a sign composed by an emission identifier IE and a number N, obtained from a counter controlled by a clock of pulses, A receives and repeats continually the sign, the repeated sign is received by X, by comparing received N with counter in moment of reception, distance between A and X is obtained; measures of X to C and D allow calculate its position.
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