Matrix pencil methods for ISAR image reconstruction

The application of matrix pencil (MP) methods to inverse synthetic aperture radar (ISAR) imaging is considered. The noise sensitivity of the reported MP methods is studied. Numerical results that provide insights into the perturbation variances of the estimated 2-D frequencies are given. It is shown that the variant method (see Y. Hua, Asia-Pacific Microwave Conference, pp.691-694, 1992) can significantly reduce the computational burden and improve the estimation accuracy. Simulation results show that the variant method can provide estimates that are closer to the Cramer-Rao bound than those obtained by the original method (see Y. Hua, IEEE Trans, SP, vol.40, no.9, pp.2267-2280, Sept. 1992). Results of the original method for both synthesized and real ISAR data sets are given to demonstrate the robustness of MP methods to model errors.<>