Bistatic micro-Doppler radar signatures of vibrating targets with along-track interferometry

This paper extends the theory of micro-Doppler (m-D) of vibrating targets into fixed receiver bistatic SAR system. With the dual-channel along-track interferometry (ATI) technique, the ground clutter is suppressed effectively and the interferometric signals of vibrating targets are reserved in the range-compressed data domain. Due to the influence of range cell migration, the interferometric signals may spread over several range cells, so an easy and feasible method is presented to obtain the accurate interferometric signals instead of carrying out the complicated range cell migration correction. And then the m-D feature of vibration along any direction without the linear Doppler slope can be extracted by using time-frequency transform. The validity of the proposed method is evaluated with simulated data.