Ultra-wideband impulse SAR imaging method based on variable threshold correlation

The invention provides an ultra-wideband impulse pulse SAR imaging method based on variable threshold correlation. The method comprises the steps of obtaining a transmitting signal and an echo signal of an ultra-wideband synthetic aperture radar, wherein the transmitting signal is a double-peak Gaussian pulse signal; calculating a correlation coefficient of the echo signal and the transmitting signal; performing windowing processing on the correlation coefficient to obtain a distance direction compression signal; carrying out distance direction interpolation processing on the distance direction compression signal to obtain a distance direction interpolation signal; and carrying out azimuth focusing processing on the distance direction interpolation signal according to a preset azimuth focusing formula to obtain an imaging result of the ultra-wideband synthetic aperture radar. According to the method, the characteristics of the double-peak Gaussian pulse signal are utilized, the echo signal is subjected to dis