Passive interrogator label system having offset compensation and

Details Passive interrogator label system having offset compensation and Passive interrogator label system having offset compensation and

1985-10-31

1988-03-29

Tarcza, Thomas H.

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

Radar transponder system

Unique identity

342174, G01S 1380

Patent

active

047346981

ABSTRACT:
A passive interrogator label system is disclosed which transmits a first signal to, and receives a second signal from a remote, encoding transponder. In the preferred embodiment, the transponder is a passive, surface acoustic wave device which receives the first signal, processes this signal and transmits, in reply, the second signal which includes a unique identification code. The passive interrogator label system incorporates a means and method for compensating for variations in signal delays within the transponder due to changes in ambient temperature as well as manufacturing tolerances of the transponder. The method includes the steps of measuring the difference in delay times between two successive delay taps in the transponder and using this difference as a standard for determining the differences in delay times between other successive taps in the same transponder.

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patent: 4625208 (1986-11-01), Skeie et al.

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