Method for extracting motion errors of a platform carrying a coh

Details Method for extracting motion errors of a platform carrying a coh Method for extracting motion errors of a platform carrying a coh

1990-07-06

1991-09-03

Barron, Jr., Gilberto

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

Synthetic aperture radar

G01S 1390

Patent

active

050458558

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.

REFERENCES:
patent: 4359732 (1982-11-01), Martin
patent: 4929950 (1990-05-01), Freeman et al.
Merrill I. Skolnik, "Radar Applications", pp. 321-356, 1987.
Livingstone et al., "CCRS C/X-Airborne Synthetic Aperture Radar: An R and D Tool for The ERS-1 Time Frame", pp. 15-21, 1998, IEEE 88 CH2572.

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