Extraction of Micro-Doppler Information Based on Slow-time Integration
LUO Ying① CHI Long① ZHANG Qun①② GUO Ying①
①（Inst. of Telecommunication Engineering, AFEU, Xi’an 710077, China） ②（Key Laboratory of Wave Scattering and Remote Sensing Information (Ministry of Education), Fudan University, Shanghai 200433, China）
Abstract：The micro-Doppler effect may be generated by additional frequency modulations on the returned radar signal, if the target contains rotating structures, such as a rotor on a helicopter. The body image will be contaminated duo to the existence of the micro-Doppler. In the paper, a simple method based on integral of slow-time is introduced, which has separated the signal from the body of target and that from the rotating parts successfully. It makes the ISAR image clearer, and also provides some information of the rotating parts, such as the radius and the rotation frequency. Finally, a computer simulation is given to prove the effectiveness of the method, and the performances of extraction of micro-Doppler spectrogram in the condition of different SNR are also discussed.
2008, Vol. 30 
