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Matched Filter Detection Circuit

IP.com Disclosure Number: IPCOM000098729D
Original Publication Date: 1959-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Lazarus, P: AUTHOR

Abstract

This phase insensitive circuit detects a signal of known wave configuration and extracts the known signal out of background noise. While the figure shows a sinusoidal signal, the known signal may have substantially any wave shape and time duration.

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Matched Filter Detection Circuit

This phase insensitive circuit detects a signal of known wave configuration and extracts the known signal out of background noise. While the figure shows a sinusoidal signal, the known signal may have substantially any wave shape and time duration.

An incoming signal of known wave configuration received on line 2 is delivered to a matched filter 4. This filter output provides the time integral of the known signal and is linearly responsive to the signal amplitude. This type of filter is described in the publication entitled, On the Properties of Matched Filters by D.W. Lytle, Stanford Electronics Laboratories, Technical Report No. 17, June 10, 1957.

The output of the filter is rectified at 6 and passed through a peak detector 8 producing a signal at 10. The amplitude of the signal at 10 is proportional to the product of the amplitude of the incoming known signal and the time duration of that signal.

The incoming signal is also fed through a parallel circuit which comprises a rectifier 12 and a peak detector 14. These produce a signal at 16 having an amplitude value proportional to the amplitude of the incoming signal.

The outputs from the two parallel circuits are delivered through a resistance network 18 to a differential amplifier 20. In 20 the output of the first peak detector is added to the output of the second peak detector producing at 22 a signal which is positive in sign if the time duration of the incoming signal is grea...