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Wavenumber domain imaging algorithm for hypersonic platform SAR with curved trajectory

As a new application platform of synthetic aperture radar (SAR), the near-space hypersonic vehicle has a more serious range migration problem than the traditional airborne platform due to its curved-flight motion characteristic, and its imaging results will be further affected under the condition of high resolution demand. Since the SAR slant range of hypersonic platform is relatively complicated, the azimuth and range in the two-dimensional spectrum obtained by means of traditional wavenumber domain imaging algorithm are mutually coupled. As a result, it is difficult to accurately correct the range migration by interpolation operation. Therefore, an improved wavenumber domain imaging algorithm is proposed in this paper. Through the appropriate approximation of the two-dimensional spectrum of the SAR echo signal, the reference function is designed and the well focus of targets in the observation scene is achieved by the Stolt interpolation. Finally, simulation results are given to verify the effectiveness of the algorithm.