Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1986-05-29
1988-07-26
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342149, G01S 0322
Patent
active
047603992
ABSTRACT:
A method for producing antenna follow-up signals in which a sum signal and a difference signal are derived from a received beacon signal and an amplitude modulated signal is produced by superposition from these two signals. The amplitude modulated signal is converted into another frequency by means of a mixer which receives both the amplitude modulated signal and a mixing signal. The converted amplitude modulated signal is fed to an amplitude detector via a narrowband bandpass filter which permits only the signal frequency to pass. A voltage controlled oscillator is cyclically switched to produce a mixing signal which is fed to the mixer and which cyclically changes its frequency between two frequencies for the duration of each phase state of the difference signal. The converted signal at the output of the mixer changes its frequency between two further frequencies in response to the change of frequency of the mixing signal. The frequency of the voltage controlled oscillator is controlled with a control voltage that is derived from a difference between attenuations suffered by the converted amplitude modulated signal in the bandpass filter at the two further frequencies of such converted signal.
REFERENCES:
patent: 2547890 (1951-04-01), Rubin
patent: 3341845 (1967-09-01), Deman
patent: 3438044 (1969-04-01), Elia et al.
patent: 3758880 (1973-09-01), Morz
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patent: 4578679 (1986-03-01), Morz
"1 Kanal-14 Monopulssystem fur eine einfache Antennennachfuhrung", Wolfgang Steinert, in Nachrichtentechnische Zeitschrift N.T.Z. 38 (1985).
ANT Nachrichtentechnik GmbH
Hellner Mark
Tarcza Thomas H.
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