High-speed maneuver flight SAR imaging method based on azimuth-time resampling

• Main Authors: GUO PING, WANG JING, HOU PENGLIANG, WANG ANYI, JIAO XIAOYANG, TANG SHIYANG
• Format: Patent
• Language: Chinese; English
• Published: 12.11.2019
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention discloses a high-speed maneuver flight SAR imaging method based on azimuth-time resampling and mainly aims to solve the problems of walk-stop model failure and acceleration-caused azimuth dimension focusing depth restriction of a high-speed maneuver flight platform. The method comprises the steps that 1, a precise high-speed maneuver platform SAR non-"wall-stop" geometric model is constructed, a receiving and transmitting range history sum is obtained, and a range equation is simplified by using the method of converting two bases into a single base; 2, primary range compression is performed on a baseband radar echo signal, and a signal after primary range compression is obtained; 3, azimuth-time resampling is performed on the signal obtained after primary range compression, and an echo signal with a traditional double-curve range history is obtained; 4, secondary range compression and range migration correction are performed on the echo signal subject to azimuth-time resampling, and a signal aft