Parametric frequency division

G - Physics – 01 – S

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G01S 7/36 (2006.01) G01S 7/38 (2006.01) H04K 3/00 (2006.01)

Patent

CA 1119702

ABSTRACT OF THE DISCLOSURE Known electronic countermeasures systems have difficulty handling some modern radar signals, for example frequency agile, frequency sliding or frequency coded signals. The invention disclosed overcomes the problems of the prior art by using an analog frequency dividing system to virtually instantaneously down-convert received signals in octave steps and in octave stages into the frequency regimes associated with the operation of processing devices, such as analog to digital converters, digital logic devices, surface acoustic wave devices, and charge coupled devices. Those processed signals which are selected for retransmission, perhaps in a modified form, are then up-converted into the region of the received signal by the appropriate number of stages of frequency multipliers. Any modification in such signal parameters as signal duration, delay, frequency, phase, power, amplitude or spectral content may be incorporated prior to the first multiplication stage, between multiplication stages, after the last multiplication stage, or any combination of the above.

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