Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Patent
1985-10-30
1987-06-30
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
324337, G01V 312
Patent
active
046774386
ABSTRACT:
An object detecting method and apparatus is disclosed and which operates by transmitting a wave toward an object embedded in a medium having a reflective coefficient at its surface, receiving the resultant reflected wave from the object, applying the received signal to a signal processing unit, and displaying the results of signal processing by the signal processing unit on a display unit. The apparatus and method, furthermore, incorporates the means or steps of multiplying the received signal by a reference signal corresponding to the high frequency wave of the radiation energy and with its phase shifted by a controlled amount, so that the frequency of a signal component included in the received signal as a result of wave reflection from the surface of the medium is converted into a frequency which can be removed by a low-pass filter, passing the resultant received signal through the low-pass filter, and applying the output signal of the low-pass filter to the signal processing unit for processing a clear and sharp image reproduction of the object on a display.
REFERENCES:
patent: 4245191 (1981-01-01), Schroeder
patent: 4583095 (1986-04-01), Peterson
Arai et al., "An Undergrond Radar System"; Trans. of the Institute of Electronics and Communications Engineering; (6/83, vol. J66-B, No. 6; pp. 713-719).
Suzuki et al.; "Underground Radar System"; Sane; (vol. 79, No. 220, 1/25/80; pp. 21-28).
Hiramoto Kazuo
Michiguchi Yoshihiro
Nishi Masatsugu
Takahashi Fuminobu
Gregory Bernarr E.
Hitachi , Ltd.
Tubbesing T. H.
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