Distance measuring equipment

Details Distance measuring equipment Distance measuring equipment

1981-05-12

1984-06-19

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 171R, G01S 1376, G01S 728

Patent

active

044555563

ABSTRACT:
In a distance measuring equipment for measuring the distance between an interrogator and a transponder with high precision by detecting the time from transmission of an interrogation pulse from the interrogator to reception of a reply pulse transmitted from the transponder on the basis of timing positions of said respective pulses; as leading edges of the interrogation pulse and reply pulse, a waveform represented by the formula of: ##EQU1## where E and F represent finite positive values and T represents time, is used, or else as a leading edge of the interrogation pulse, a waveform which can be approximated by the above formula is used, while as a leading edge of the reply pulse, a waveform obtained by passing a waveform approximately expressed by the formula of: ##EQU2## through a low-pass filter having a predetermined cut-off frequency, is used.

REFERENCES:
patent: 3458817 (1969-07-01), Cooper et al.
patent: 3716857 (1973-02-01), LeGrand
patent: 3736589 (1973-05-01), Rambo
patent: 3772699 (1973-11-01), Romrell
patent: 3890618 (1975-06-01), Speiser
patent: 3934251 (1976-01-01), Spratt
patent: 4123755 (1978-10-01), Fishbein et al.
patent: 4320399 (1982-03-01), Buck et al.

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