Efficient Insar Imaging Based on Frequency-Domain Back Projection Algorithm

High resolution imaging of interferometric synthetic aperture radar (InSAR) usually requires fine focusing and phase-preserving. Time-domain back projection (TDBP) method outperforms other conventional methods at focusing and phase-preserving, but suffer from huge computational complexity when the underlying scene is large. In this article, an efficient method exploiting by frequency-domain back projection (FDBP) is presented for high-resolution InSAR imaging. In the scheme, the coherent integration of focusing is efficient achieved by frequency-domain Fourier transform, and a delayed-distance is compensated to phase-preserving of InSAR. Simulation and experiment results demonstrates that FDBP algorithm improves the computational efficiency by three times while maintaining the similar focusing accuracy compared with the conventional TDBP method.