Motion Parameters Estimation of High-speed Moving Target for Stepped Frequency Chirp Signal

When the stepped frequency chirp signal (SFCS) is used by a radar for high-speed moving target imaging, motion compensation is the very crucial step because the time-bandwidth product is usually very large, serious motion induced phase error is thus suffered. In this paper, the impact of high-speed target motion on the synthetic range profile of SFCS is first analyzed. Then a new motion parameters estimation approach called extended cross-correlation inner frame (ECCIF) method is proposed, which can measure both the radial velocity and acceleration of a target by using the echoes of sub-pulses within a burst, thus accurate motion compensation can be performed. Simulations are conducted to verify the proposed method and very well focused range profile are obtained.