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A coherent optical RF memory has an input circuit for receiving RF input signals having wideband frequency content. An electronically tuned frequency selector selects from the RF input at least one desired RF signal having a desired frequency content for storing in memory. A first transducer respons

A coherent optical RF memory has an input circuit for receiving RF input signals having wideband frequency content. An electronically tuned frequency selector selects from the RF input at least one desired RF signal having a desired frequency content for storing in memory. A first transducer responsive to the frequency selector converts the at least one desired RF signal into an optical signal representative of the RF signal. The optical signal is stored in an optical storage device. A second transducer responsive to the optical storage device converts the stored optical signal back to an RF signal, forming a recirculating loop. The desired signal is automatically self-equalized as it recirculates in the loop in order to avoid oscillation while maintaining signal coherency. The desired signal may be used for jamming or deception in electronic warfare (EW) or electronic intelligence (ELINT) systems.

대표청구항 ▼

A coherent optical RF memory comprising (a) input means for receiving RF input signals having frequency content over a wide frequency spectrum, (b) frequency selector means for selecting from the RF input at least one desired RF signal having a desired frequency content for storing in memory, said f

A coherent optical RF memory comprising (a) input means for receiving RF input signals having frequency content over a wide frequency spectrum, (b) frequency selector means for selecting from the RF input at least one desired RF signal having a desired frequency content for storing in memory, said frequency selector means comprising a closed loop electrically-variable self-equalizing filter circuit having a signal path with an input end and an output end and a feedback path having an inlet end connected to the output end of the signal path and an output end connected to the input end of the signal path, the input end of the signal path being connected to the input means and the output feedback signal of the feedback path, the signal path comprising amplifier means and output means for providing a filtered output signal and a feedback input signal to the feedback path, the feedback path comprising a plurality of independent electronically-variable filter means in cascade for generating a feedback signal containing a plurality of desired frequency components to be selected from the RF input signals, (c) first transducer means responsive to the frequency selector means for converting the at least one desired RF signal into an optical signal representative thereof, (d) optical storage means responsive to the transducer means for storing the optical signal, and (e) second transducer means responsive to the optical storage means for converting the stored optical signal back to an RF signal.