Method and device for the measurement of short distances by anal

Details Method and device for the measurement of short distances by anal Method and device for the measurement of short distances by anal

1992-10-15

1993-11-30

Hellner, Mark

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

Determining distance

With frequency modulation

342145, G01S 1308

Patent

active

052669564

ABSTRACT:
The distance between the target and the measurement means is segmented into adjacent distance compartments, the first one of which starts at the zero distance. Each distance compartment has an associated energy level obtained by the demodulation of the delay measurement signal resulting from the product of correlation between the emitted signal and the received signal reflected by the target. The disclosed method consists in creating two distinct aliasings of the spectrum of the signal measurement signal, the energy level of which corresponds to the first distance compartment, these aliasings being achieved on the part of the spectrum corresponding to negative distances. This two distinct aliasings make it possible to obtain two distinct energy levels on the totality of the first distance compartment, and thus enable the measurement of all the distances on this first distance compartment, including the very small distances, even almost zero distances, by comparisons and analyses of the two energy levels.
Application: to the measurement of short distances for the detection of short-distance targets.

REFERENCES:
patent: 2453169 (1943-04-01), Varian
patent: 4078234 (1978-03-01), Fishbein et al.
patent: 4591865 (1986-05-01), Canal

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