Micro-Doppler analysis and imaging of air-planes with rotating parts

In ISAR imaging of air-planes with rotating parts, the micro-Doppler phenomenon induced by the rotors will generate side-bands about the rigid body image. This paper derives the imaging model and analyzes the micro-Doppler of rotors. Then, a method for micro-Doppler separation based on low chirp rate matching is proposed. Meanwhile, an algorithm for scaling the 2D imaging of rigid body is presented, based on the complex-valued back-projection algorithm. Similarly, ISAR imaging of the rotating rotors can be obtained through the same algorithm. Finally, images from the rigid body and the rotating rotors are merged together to obtain a full image of the air-plane. The validity of the proposed algorithms has been proved by simulations.