Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system
Patent
1997-03-11
1998-11-24
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
G01S 740
Patent
active
058413936
ABSTRACT:
A high frequency signal, which is produced in a oscillator, is modulated by a frequency from a modulating signal generated by a modulation signal generator and radiated from a sending antenna. A reflected signal from a target object is received by a receiving antenna, and frequency-converted by a local oscillating signal from a directional coupler in the frequency convertor. Then, distance and speed information is detected by a signal processing unit. A modulator, which is connected to the oscillator, modulates the oscillator output in order to detect a failure. A detection unit, in which a filter unit, a rectification circuit, and a voltage comparison circuit are included, detects modulated elements originated in the above described modulator. The signal processing unit makes a failure determination based on the modulated elements which have already been detected.
REFERENCES:
patent: 3932870 (1976-01-01), Shapiro et al.
patent: 4245221 (1981-01-01), Kipp et al.
Patent Abstracts of Japan, vol. 18, No. 175 (Dec. 24, 1993).
Patent Abstracts of Japan, vol. 18, No. 295 (Mar. 4, 1994).
G. Trummer, "A Compact Radar Altimeter for Military and Civial Applications"; Proceedings of the MM Conference, No. 9 (Oct. 14, 1992).
Isaji Osamu
Saito Tamio
Fujitsu Limited
Fujitsu Ten Limited
Pihulic Daniel T.
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