FM modulation technique for producing frequency rejection bands
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United States of America Patent
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May 22, 2001
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app pub date -
May 20, 1988
filing date -
May 20, 1988
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Abstract
Presented in this invention is a technique for producing a null in the frequency spectrum of an FM signal pulse, the null matching an interference that has been superposed on the signal pulse. By matching the null to the interference, the energy in the frequency spectrum is shifted in such a way that when the interference is rejected by a band elimination filter, none of the useful energy would be discarded along with the rejected interference. Consequently, a signal resulting from the technique has a much higher amplitude than previously filtered signals. This leads to the signal being more readily recognized by detection systems, such as a radar detector.
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