Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1992-10-09
1994-10-11
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 44, 342 51, G01S 1380
Patent
active
053551370
ABSTRACT:
A method is described for reading the data stored in a passive responder (20) by means of an interrogation device (10) including a receiving section (14). To initiate a read cycle the interrogation device (10) transmits an HF interrogation pulse which on reception in the responder (20) is used to generate a supply voltage and initiates the transmission of an HF signal coded with the stored data. The frequency of the HF interrogation pulse is varied during its transmission over a predetermined range containing the nominal frequency of the responder (20). The receiving section (14) of the interrogation device (10) includes a tuning circuit (15) which adjusts the receiving frequency of the receiving section (14) to the frequency of the HF signal transmitted by the responder (20).
REFERENCES:
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4068232 (1978-01-01), Meyers et al.
patent: 4104629 (1978-08-01), Isbister et al.
patent: 4359733 (1982-11-01), O'Neill
patent: 5164985 (1992-11-01), Nysen et al.
patent: 5258762 (1993-11-01), Cabon et al.
Donaldson Richard L.
Kesterson James C.
Mapstone Rebecca
Sotomayor John B.
Texas Instruments Incorporated
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