Method of extracting motion errors of a carrier bearing a cohere

Details Method of extracting motion errors of a carrier bearing a cohere Method of extracting motion errors of a carrier bearing a cohere

1994-04-06

1995-08-08

Pihulic, Daniel T.

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

342195, G01S 1390

Patent

active

054403090

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.

REFERENCES:
patent: 5045855 (1991-09-01), Moreira
patent: 5166688 (1992-11-01), Moreira
patent: 5257028 (1993-10-01), Keydel et al.

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