Abstract:

Unambiguous reconstruction is a key step in multichannel synthetic aperture radar (SAR) imaging. An unambiguous reconstruction method based on Doppler spectral estimation is proposed in this paper, which is improved based on the existing algorithms. This method effectively solves the problem of Doppler spectral reconstruction when the number and position of Doppler ambiguities and the steering vectors are unknown. The algorithm proposed obtains the aliased Doppler spectral structure by means of Capon spectral estimation, and then constructs the steering vector to realize the unambiguous reconstruction, which can maintain the integrity of the Doppler spectrum and restrain the noise at the edge of the Doppler spectrum. Simulation results verify the effectiveness of this algorithm.