Frequency domain imaging method for one-stationary bistatic low-frequency ultra-wide band SAR

• Main Authors: LI XIANGYANG, AN DAOXIANG, LI YUELI, CHEN LEPING, HUANG XIAOTAO, XIE HONGTU, ZHOU ZHIMIN
• Format: Patent
• Language: English
• Published: 11.03.2015
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; CALCULATING; COMPUTING; COUNTING; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC DIGITAL DATA PROCESSING; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention provides a frequency domain imaging method for one-stationary bistatic low-frequency ultra-wide band SAR (Synthetic Aperture Radar). According to the technical scheme, the method comprises the following steps: firstly, based on echo signals of the one-stationary bistatic low-frequency ultra-wide band SAR, and compensating a high-order phase error in a two-dimensional frequency domain to obtain preprocessed echo signals; then, carrying out range imaging processing and azimuth imaging processing on the preprocessed echo signals to obtain an SAR image. The method has the benefits that the high-order phase error is compensated in the two-dimensional frequency domain, so that errors caused by second-order Tailor expansion of range and direction coupling terms are corrected, the influence of the high-order error on imaging processing in a low-frequency ultra-wide band signal is reduced, the high-precision imaging processing on the one-stationary bistatic low-frequency ultra-wide band SAR is implemented, and finally a good focused image is obtained.