Final technical rept. 20 Feb 79-31 Mar 80,
AMERICAN ELECTRONIC LABS INC LANSDALE PA
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This report describes a technique and equipment for detecting pulsed signals in a high noise environment. The performance of this technique approaches matched filter techniques for signals where the pulse parameters are not known a-priori. A common problem in the area of signal processing is that of the detection of pulse signals having very low signal-to-noise ratios SNR. This problem is worsened when major signal parameters pulse width and time of arrival are not known. The purpose of this program was to develop an improved exploratory development model of a system to detect the presence of low SNR signals, on a single pulse-by-pulse basis. The technique chosen for this program was the use of the Walsh Transform as the basis for a two transform digital filter. This technique has been demonstrated by AEL as a result of in-house IRD programs and implemented to USAF preliminary requirements under a previous contract for a Walsh Adaptive Filter RADC Report TR-78-82 for Contract F30602-76-C-0299. The current program was to further develop the technique and to fabricate a programmable unit suitable for test and evaluation purposes against a variety of potential applications. The system name, Walsh Preprocessor WP, was derived from the use of a Walsh transform to adaptively filter signals of varying pulse widths and repetition rates.
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- Non-Radio Communications