Doppler velocity measurement method with a second-time-around echoes suppression for synthetic bandwidth radars

A synthetic bandwidth radar is proposed to improve range resolution. The transmitted frequency and down- conversion frequency of this radar are shifted by a fixed frequency step from pulse to pulse. However, this radar has a problem of the second-time-around echoes since multiple pulses are utilized for high range resolution. Moreover, a range shift occurs due to Doppler velocity. Thus, a second-time-around echoes suppression and Doppler velocity compensation are re- quired to obtain the accurate target range. In this paper, we propose a Doppler velocity measurement method with a second- time-around echoes suppression for synthetic bandwidth radars. Our proposed method utilizes an alternating transmission of the ascending frequency sequence and descending frequency sequence. We also show an experimental verification of the proposed method.