Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1993-12-03
1995-09-12
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 51, G01S 1380
Patent
active
054500869
ABSTRACT:
A self-tuning receiver/decoder for reception of FSK data transmission. An RF stage with resonant circuit (10) is tuned to a first of four possible transmitted frequencies for reception of such frequencies according to interrogation at such frequencies in sequence. Threshold (18) and counter circuits (12, 16) detect each frequency shift change of transmitted frequency and accordingly retune the resonant circuit to a subsequent unknown frequency by counting through a predetermined sequence for possible reception of each of such frequencies. Provision (24) is made for latching frequency shift data bit signals accordingly as output in a format identical to the frequency shift-keying RF format received. The receiver/decoder is especially useful for miniaturized transponder operation in which it alternates between receiving and transmitting modes, and is powered by capacitively stored charge in response to continuous transmission of the first frequency over a period.
REFERENCES:
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5347280 (1994-09-01), Schuermann
patent: 5374930 (1994-12-01), Schuermann
Donaldson Richard L.
Kesterson James C.
Pihulic Daniel T.
Texas Instruments Deutschland GmbH
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