G - Physics – 01 – S
Patent
G - Physics
01
S
343/12, 343/19,
G01S 13/74 (2006.01) B61L 25/04 (2006.01) G01S 13/75 (2006.01) G06K 19/067 (2006.01) G08G 1/017 (2006.01) H04L 27/26 (2006.01)
Patent
CA 1069606
Abstract of the Disclosure A foreground subject-identifying apparatus comprises a sweep signal generator for issuing a sweep signal having frequencies fs falling within a prescribed range; a carrier wave generator for producing a carrier wave having a frequency f0; a first frequency mixer for mixing output signals from the sweep signal generator and carrier wave generator to generate an output signal having a frequency f0+fs; a first antenna through which to transmit an output signal from the first frequency mixer; a second antenna mounted on the foreground subject to receive an output signal sent forth from the first antenna; a coding circuit carried on the foreground subject which is provided with a plurality of resonance circuits resonating at different fre- quencies fT and adapted to form a specified code from a combination of these different resonance frequencies; a signal mixer for detecting an output signal from the second antenna to supply a signal having frequencies fs to the coding circuit and modulating the signal having a frequency f0 by resonance signals from the coding circuit to deliver a signal having a frequency f0+fT to the second antenna; a second frequency mixer for mixing an output signal having a frequency f0 from the carrier have generator, and a signal having a frequency f0+fT received from the signal mixer through the second and first antennas and thereby issuing a signal having a frequency fT; and a coded signal interpreting circuit for detecting resonance frequencies out of a signal delivered from the second frequency mixer, thereby interpreting a coded signal supplied from the coding circuit.
268687
Kamata Shohichi
Kimura Yoshinori
Sakuragi Johji
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