Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-06-28
1979-04-24
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 75, 343 16LS, G01S 952, G01S 958
Patent
active
041515250
ABSTRACT:
The disclosed system is intended to supply angular and range data regarding the position of an object to be located in a reference system. The system comprises an interrogator which transmits a linearly frequency-modulated signal to a transponder disposed on the object. The transponder is provided with means for shifting the frequency of the received signal in one direction by a predetermined amount characteristic of that transponder and means for retransmitting the received signal. The interrogator further includes a pair of receiving antennas whose signals are used for forming beat signals with the transmitted signal. The interrogator is also provided with means for shifting the frequency of the beat signals in the other direction by the same amount. At least one of the shifted beat signals is applied to a frequency discriminator whose output signal is utilized for controlling the slope of the modulation signal in order to keep the frequency of the shifted beat signal constant.
REFERENCES:
patent: 3246322 (1966-04-01), Kuecken
patent: 3341845 (1967-09-01), Deman
patent: 3739378 (1973-06-01), Botzum et al.
patent: 3825929 (1974-07-01), Toman
patent: 3987446 (1976-10-01), Lipsky
patent: 3992709 (1976-11-01), Watanabe et al.
patent: 4001825 (1977-01-01), Antonius
Strauch Raymond
Tomasi Jean-Pierre
Hubler Malcolm F.
Tamoshunas Algy
Telecommunications Radioelectriques et Telephoniques T.R.T.
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