Frequency diversity transponder arrangement

Details Frequency diversity transponder arrangement Frequency diversity transponder arrangement

1993-07-02

1994-09-13

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

342 51, G01S 1374

Patent

active

053472802

ABSTRACT:
A method of communicating between a transponder and an interrogator. The interrogator (10) transmits a wireless RF interrogation which is received by the transponder (12). The transponder (12) then transmits a wireless RF response. The wireless RF response has a first channel response centered at frequency FDX1=RF+SC, a second channel response centered at frequency FDX2=RF-SC, and a third channel response centered at frequency FDX3=SC. The third channel response is a spurious signal resulting from using a non-linear element (32) as the transponder modulator (32,34). The interrogator (10) receives this wireless RF response. The response is received in the three channels with a first circuit (82) operable to receive said first channel response, a second circuit (86) is operable to receive said second channel response, and a third circuit (86,88) is operable to receive said third channel response. A controller (102) then selects the response from one of said first, second, or third circuits (82,86,88) for demodulating. A demodulator (100) may then demodulate one the selected channel responses. Other arrangements, systems, and methods are disclosed.

REFERENCES:
patent: 4006477 (1977-02-01), Yost, Jr. et al.
patent: 4471344 (1984-09-01), Williams
patent: 4804961 (1989-02-01), Hane
patent: 5053774 (1991-10-01), Schuermann et al.
Ser. No. 08/065,286, Filed May 21, 1993, by Josef Schuermann.

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