Method for resolving ambiguity in the determination of antenna a

Details Method for resolving ambiguity in the determination of antenna a Method for resolving ambiguity in the determination of antenna a

1991-08-23

1994-04-26

Barron, Jr., Gilberto

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

Synthetic aperture radar

G01S 1390

Patent

active

053070704

ABSTRACT:
In a method for resolving ambiguity in the determination of antenna angle of view and Doppler frequency in synthetic aperture radar (SAR), by evaluating the dependence of the Doppler frequency on the transmitting frequency a skew of the two-dimensional Fourier power spectrum or the two-dimensional autocorrelation function of radar data is measured in that the radar data are subjected to a range Fourier transformation and for the individual range frequencies in a following Doppler centroid estimator a Doppler centroid determination is carried out in the azimuth direction.
By this method the pulse repetition frequency ambiguities are eliminated without any demands having to be made on the data acquisition or a high image contrast; this method can therefore be applied to any region of the raw data matrix. Moreover, no azimuth compression is necessary.

REFERENCES:
patent: 3768096 (1973-10-01), Dentino
patent: 4563686 (1986-01-01), Boles
patent: 4924229 (1990-05-01), Eichel et al.
patent: 4929950 (1990-05-01), Freeman et al.
patent: 4985704 (1991-01-01), Smith
Ellis, A.B.E.: "The Processing of Synthetic Aperture Radar Signals" in BG-2: GEC Journal of Research, vol. 2, No. 3, 184, pp. 169-177.

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