A Novel Method of Cross-range Scaling Interferometric ISAR Based on Randomized Hough Transform

Considering the phase wrapping issue in the cross-range scaling of interferometric ISAR, a novel algorithm of cross-range scaling is proposed based on Randomized Hough Transform (RHT). Using the linear relationship between the azimuth positions derived from the wrapping interferometric phases and the Doppler frequencies of the dominant scatters in ISAR image, the proposed algorithm estimates the scale factor between true azimuth position and Doppler frequency by RHT and determines the ISAR image scale in the cross-range direction, consequently avoiding the complex phase unwrapping procedure. The simulation results verify the validity and anti-noise capability of the proposed algorithm.