Method and device to determine the passing to a pre-selected dis

Details Method and device to determine the passing to a pre-selected dis Method and device to determine the passing to a pre-selected dis

1993-03-19

1994-09-20

Hellner, Mark

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

Determining distance

With frequency modulation

342130, G01S 1338

Patent

active

053493583

ABSTRACT:
The wave is modulated in frequency (or in phase) and a measurement is made of the frequency of the beat between the transmitted wave and the received wave which gives the propagation delay and hence the distance. The method provides for the superimposing, on this modulation, of a periodic over-modulation with a period that is equal to or is a multiple of the propagation delay corresponding to a pre-selected expected distance. The device comprises, at transmission, in the case of a linear modulation of frequency, a saw-tooth generator (31) and a generator of over-modulations (32), for example sinusoidal, controlled by the expected distance given by a distance selector (30). The modulation signal of the transmitter is obtained by summation (33) of the signals of the two generators (31, 32).

REFERENCES:
patent: 4241347 (1980-12-01), Albanese et al.
patent: 4591865 (1986-05-01), Canal
patent: 4812035 (1989-03-01), Freedman et al.
patent: 5134411 (1992-07-01), Adler
patent: 5220331 (1993-06-01), Neininger Gunter

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