Star-union Forward-looking Bistatic Sar Imaging Principle And Algorithm Research

Because of the separation between transmitter and receiver platform, bistatic synthetic aperture radar (BiSAR) can image the forward-looking terrain of receiver platform with reasonable space arrangement, so can effective solve the problem that monostatic SAR can't image the forward-looking terrain. Spaceborne/airborne forward-looking bistatic SAR (SA-FBiSAR) use spaceborne as transmitter and airborne as receiver, this system has more flexible system and greater range of observations, so it can be widely used both civilly and militarily, such as autonomous navigation, autonomous landing and precision strike etc. SA-FBiSAR is becoming the research focus of remote imaging field.As a new research focus, the most theories of SA-FBiSAR are not completed. There is not yet a efficient algorithm for SA-FBiSAR.This dissertation mainly researches echo model, point target response function,resolution characteristics, flight patterns and imaging algorithm for SA-FBiSAR. The main works of dissertation are as follow:1. Established the geometric model and echo model of SA-FBiSAR, and compared the impact of different flight patterns on system performance with synthetic aperture time, Doppler characteristic and resolution characteristics. Then analysis the feasibility of SA-FBiSAR system;2. Reasonable extend the approximate expression of range history based on space domain expansion. Deduced the new approximate expression of range history which is suitable for SA-FBiSAR system;3. According to the new approximate expression, proposed corresponding range migration correction method and 2-D spectrum model of SA-FBiSAR;4. According to the 2-D spectrum model, proposed corresponding imaging algorithm and distortion correction method based on spatial characteristics of approximate expression.