Imaging Study of High Squint SAR Based on FMCW

This paper establishes the model of high squint FMCW SAR received signal, analyzes its characteristics, and posts the Doppler frequency shift effect induced by the continuous motion in range direction while radar transmitting and receiving signal. Meanwhile, this paper proposes a modified RD algorithm (RDA) aimed at high squint FMCW SAR dechirp-on-receive data, which compensates for range walk in the time domain, Doppler frequency shift and range curve in the frequency domain. Point target simulation verifies the analysis and validity of the proposed algorithm. In addition, for the Doppler frequency shift induced by the continuous motion while radar transmitting and receiving signal, this paper also analyses its effect on image.