| 摘要 |
PURPOSE:To enable a position to be accurately measured without such a complex processing as a lane discrimination or the like by using pseudo noise signs (PN signs) composed of digital codes as a medium for measuring the arrival time of waves. CONSTITUTION:Waves modulated by pseudo noise signs are transmitted from a master station M to slave stations S1-Sn, receiving the waves, produce pseudo noise signs synchronizing those in the received waves at least at an initial stage and transmit the waves modulated by the pseudo noise signs to the measuring station O. The measuring station O obtains the differences in the arrival time of the waves from the master station M from the pseudo noise signals involved in the respective waves and, based thereon, calculates the position of the measuring station O by a hyperbolic system.
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