Patent ID: 6603424
Filing Date: 2003-08-05
Classification: G01S

Abstract:
A method of reducing errors in synthetic aperture radar signals from a plurality of range lines where each range line includes a plurality of azimuth positions, said method comprising:receiving a plurality of slow-time samples representing radar signals for a plurality of azimuth positions for a plurality of range lines; estimating a phase error for each slow-time sample; compensating the plurality of slow-time samples by the estimated phase errors to obtain a plurality of range-line samples; processing the range-line samples according to a superresolution signal processing technique to thereby obtain a plurality of Doppler frequencies for a plurality of point scatterers at each range line; reconstructing a true signal for each range line based upon the plurality of Doppler frequencies; and obtaining a correction to the estimated phase error for each slow-time sample based upon the range-line samples and the true signals.