Doppler frequency parameters estimation for SAR imaging using a modified discrete chirp-Fourier transform

The key technology of high resolution radar image is to precisely estimate the Doppler parameters. The discrete chirp-Fourier transform (DCFT) proposed recently is an effective technique for chirp signal detection. But it requires some rigorous restriction on the signal length and parameters, which restricts the application of DCFT to the engineering fields. The paper advanced a novel modified discrete chirp-Fourier transform (MDCFT) to overcome the restriction, this new transform can make the signal energy concentrate in the transform domain to precisely estimate the parameters. The simulation SAR imaging based on the MDCFT proves that the new algorithm is more practical and effective.