Method and apparatus for responding to an interrogation signal
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United States of America Patent
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-
Sep 26, 1995
Grant Date -
N/A
app pub date -
Nov 15, 1993
filing date -
Nov 15, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transponder receives a stable reference frequency transmitted from an interrogator and compares the stable reference frequency to a local oscillator frequency that has short term stability. A comparison signal is provided to a synchronous oscillator for providing a locked signal that briefly locks onto the comparison signal and 'remembers' its phase and frequency characteristics. The locked signal, which is inherently locked to the stable reference signal of the interrogator, is then combined with the short-term stable local oscillator frequency, and the combined signal is used in the up-converted reply back to the interrogator.
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