The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Jul. 06, 1990
Joao Moreira, Landsberg, DE;
Deutsche Forschungsanstalt fur Luft- und Raumfahrt e.V., Cologne, DE;
Abstract
In a method for extracting motion errors of a platform carrying a coherent imaging radar system from raw radar data, azimuth spectra continuously following each other in time are formed over a set period of time for the imaging of terrains with mainly homogeneous ground reflectivities. An estimate of the ground reflectivity part is performed with a Kalman filter and with the aid of the azimuth spectra represented and system parameters entered. Then the antenna pattern part is obtained by dividing the azimuth spectrum by the estimated ground reflectivity part. By frequency filtering a separation of the drift angle .phi.(t) from the velocity V.sub.b (t) in the LOS- direction of the antenna is subsequently performed and then the velocity obtained is subjected to normalization after having been integrated, from which results the displacement in the line of sight direction of the antenna.