Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1995-08-03
1997-05-06
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
G01S 1390
Patent
active
056275439
ABSTRACT:
In connection with a method for image generation by means of two-dimensional data processing, received SAR data are multiplied by a phase correction (H.sub.mc) for a reference range (r.sub.ref) for the insertion of a motion compensation and for processing at a high drift angle, and an additional cubic phase term is inserted for compensating a range migration. The entire range migration is then eliminated by means of an additional linear frequency displacement; subsequently the SAR data are transformed back into the "range-Doppler" domain. A remaining phase error, created by a "chirp scaling" correction, is corrected, the SAR data are transformed back into the time domain and a phase correction as a function of the range is performed by multiplication for the exact motion compensation in the time domain. The one-dimensional reference function is performed in the frequency domain for azimuth compression, by means of which two-dimensional SAR data are obtained.
REFERENCES:
patent: 5327140 (1994-07-01), Buckreu
patent: 5394151 (1995-02-01), Knaeli et al.
Chialin Wu et al, Modeling and a Correlation Alogorithm for Spaceborne SAR Signals, AES, vol. AES-18, No. 5, pp. 563-575, Sep. 1982.
C. Cafforio et al, SAR Data Focusing Using Seismic Migration Techniques, AES, vol. 27, No. 2, pp. 194-207, Mar. 1991.
R. Keth Raney, Precision SAR Processing Using Chirp Scaling, IEEE, vol. 32, No. 4, pp. 786-799, Jul. 1994.
Stefan Buckreuss, Motion Errors in an Airborne Synthetic Apeture Radar System, ETT, vol. 2, No. 6, pp. 655-664, Nov.-Dec. 1991.
Deutsche Forschungsanstalt fur Luft-und Raumfahrt e.V.
Lobo Ian J.
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