Walsh Preprocessor.
Abstract
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 IR/D 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1980
- Accession Number
- ADA091188
Entities
People
- James Van Cleave