Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1991-10-28
1993-11-02
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342188, G01S 1376
Patent
active
052587622
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system of identification between at least one interrogation station or interrogator and at least one, and possibly a plurality of, response stations or responder units.
And more particularly, the invention is applicable to the identification of a responder unit from an interrogation station; one of the two elements, either the responder unit or the interrogator, is mobile with respect to the other and identification is obtained without contact; transfer of the data being effected by radio waves.
2. Background Art
Numerous systems of this type which allow identification of a responder unit are known, and FIG. 1 illustrates the various functions performed within the framework of the presently known interrogation systems which are followed by an identification response.
According to FIG. 1, it is seen that an interrogation station 1 (fixed or mobile) emits a coded signal 5 on a radio wave length in particular and preferably on a submetric wave length.
More especially, UHF radio waves are used; the term "UHF wave" is used in the course of the present specification to designate radio frequency waves higher than 100 MHz.
To that end, the interrogation station or interrogator 1 comprises a wave generator or oscillator 4 which supplies the antenna 3 for the emission of the interrogation wave 5. This signal is picked up by the antenna 6 of a badge 2 which may transmit the signal to the detector 7 which alerts the control electronics 8, which triggers off, on the one hand, the memorizing of the signal picked up in the floating memory 9 as well as the supply of the modulator 10.
The signal is received by the badge 2 after modulation has taken place and is transmitted to antenna 3 which re-emits (echos) a response wave 11 of the same kind as the interrogation wave, but after modulation has taken place.
This wave is received in turn by antenna 3 of the fixed station and is processed by the mixer 12 with a view to extracting a low-frequency signal which corresponds to the modulation of the carrier wave; this low-frequency signal after amplification in 14 is processed in a microprocessor 13 in order, in particular, to analyze the signal and to determine the contents of the data.
This same device, limited to the interrogator, is illustrated by the diagram of FIG. 2.
BROAD DESCRIPTION OF THE INVENTION
This invention contributes improvements to and considerably develops the possibilities of use of the interrogation-response identification systems of the type specified.
A first object of the invention is to broaden the spectrum of the positionings of the responder unit in a state of receptivity with respect to the interrogator.
According to this development, the servitudes of the known devices which allow a good receptivity of the interrogation signal by the responder units only in privileged and relatively limited positionings of said responder unit, are eliminated.
A second object of the invention aims at broadening the practical possibilities of use of the identification system, particularly in the presence of a plurality of responder units capable of presenting themselves concomitantly at the interrogation station.
And it will thus be possible within the framework of the developments described hereinafter, to produce an interrogation system making it possible to detect, in discriminatory manner and separately, each of the responder units, although these latter present themselves substantially at the same time opposite the interrogator, avoiding response signals interfering between them.
To the end, the invention relates to an identification system of the type comprising, on the one hand, an interrogator constituted by a radio ultra high frequency wave transceiver. The interrogator comprises an interrogator emission antenna for emission of a permanent inquiry wave and an interrogator reception antenna. On the other hand, the invention includes a responder. The responder comprises a responder reception antenna for reception of the
REFERENCES:
patent: 3716856 (1973-02-01), Beguin
patent: 3945006 (1976-03-01), Cleeton
patent: 4679046 (1987-07-01), Curtis et al.
patent: 4799059 (1989-01-01), Grindahl et al.
patent: 5021790 (1991-06-01), Ohta et al.
Cabon Philippe
Habigand Jean-Francois
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