An Error Estimation Method for Stepped Frequency Chirp Sar Signal Based on Received Echoes

To reconstruct the spectrum of a wide band signal by stepped-frequency chirp signals, the mismatch between sub-band signals should be compensated. In this paper, a novel method is proposed to estimate the phase error between adjacent sub-band signals based on the overlapped spectra. It is very computationally efficient and effective without increasing the hardware load. Finally, the simulated and real data confirm the validity of the method.