Processing for airborne interferometric SAR data with high squint

A novel approach for the highly squinted airborne InSAR data processing is presented. Using the IMU data to resolve the PRF ambiguity and moving azimuth windows according to the Doppler centroid varying in the different range, as well as combining the auto-registration imaging algorithm, such approach not only can compensate the squint effect and motion error directly at the imaging processing stage, but also can improve the coherence and restrain the interferometric phase error of the image-pair. The simulative and practical results indicate that the proposed approach is very suitable for the processing of the data with a high squint for a dual-antenna airborne InSAR system with its efficiency in improving the image quality and enhancing the interferogram and coherence.