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:
Aug. 08, 1995
Filed:
Apr. 06, 1994
Joao Moreira, Landsberg, DE;
Bernd-Peter Noichl, Rosenheim, DE;
Abstract
In a method of extracting motion errors of a carrier bearing a coherent imaging radar system from radar raw data, after calculating the entire azimuth spectrum (S(f,i)) and before correlation the azimuth spectrum is broken down over the entire bandwidth into n subspectra (S.sub.1 (f,i) . . . . S.sub.n (f,i)). Associated time-consecutive n subspectra of the two azimuth spectra are correlated with each other; by means of an expected frequency shift (v.sub.er) a window width is defined. From the curve (K.sub.0 (f,i)) obtained by correlation of the azimuth spectrum and from the subcurves (K.sub.i (f,i) . . . . K.sub.n,(f,i)) obtained by subcorrelations the maximum curve value within the window is determined. From the expected frequency shift (v.sub.er) and a just calculated frequency shift (V(i)) the new frequency shift (v'.sub.er) to be expected is determined. After simultaneous performing of the method steps described above over several strips of range gates (N.sub.s), a frequency shift (V(i,m) is calculated for each strip and a matrix is formed therefrom, from which all the values equal to zero are sought, whilst from adjacent positions of each zero position a new value is interpolated.