Patent · US Expired

Method for determining a periodic pattern in a line spectrum

US5436847A · kind A · utility

16Cited by

8References

12Claims

0Family size

Assignee

Deutsche Aerospace AG · DE

Inventors

Wolfgang Schröer · Lauenburg/Elbe, DE
Christoph Bauer · Graz, AT
Johannes Schmid · Schwäbisch Gmünd, DE

Key dates

Filing date	May 26, 1994
Grant date	Jul 25, 1995
Priority date	—
Expiry date	May 26, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S706/90
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a method for determining a periodic pattern in an amplitude spectrum, for example, in a Doppler spectrum of a radar echo. A residual spectrum is formed using Fuzzy Set Theory, and the periodic pattern is determined for each residual spectrum by histogramming the original spectrum. The method can be used for identifying aircraft, for example helicopters, that have periodically-moving components, e.g., rotors, that generate a periodic pattern in a Doppler spectrum.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.