Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Radar transponder only
Patent
1993-11-15
1995-09-26
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Radar transponder only
342 45, 342103, 342 31, G01S 1379
Patent
active
054537487
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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Edwards Christopher O.
Sotomayor John B.
Westinghouse Norden Systems
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