System for measuring the distance between two stations mobile wi

Details System for measuring the distance between two stations mobile wi System for measuring the distance between two stations mobile wi

1992-09-15

1993-08-03

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With remote cooperating station

342 42, 342 51, H01Q 2106, G01S 1308

Patent

active

052333531

ABSTRACT:
An emitted wave is transmitted from a central station to a passive end. A phase modulation circuit in the passive end modulates a signal resulting from the emitted wave for retransmitting it in the form of a two-phase-state modulated signal at the rhythm of a clock signal. In the central station, the modulated signal is demodulated into two quadrature signals. On the basis of the product of the two quadrature signals and the sign of the difference between the moduli of the rectified quadrature signals, the count of an up-down counter in a digital processing circuit is incremented or decremented in order for said count to be representative of the distance separating the passive end and the central station.

REFERENCES:
patent: 4278977 (1981-07-01), Nossen
patent: 4959645 (1990-09-01), Guena et al.
patent: 4983976 (1991-01-01), Ogata et al.
patent: 5164719 (1992-11-01), Guena et al.

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