A Stretched Deramping Radar Technique for High-Resolution SAR Processing in Ka-Band Using the Extended Integration Time

Abstract

To increase the image quality of Synthetic Aperture Radar (SAR) is one of the hot-issue for high-performance detection/reconnaissance. With this interest in the SAR technique, it generates various techniques according to the purposed platforms (Auto-SAR, ViSAR, InSAR, PolSAR, etc.). In this paper, we introduce high efficiency and useful techniques, which can be applied to various SAR applications for generating high-quality images in Ka-band. We propose stretched de-ramping hardware system applicable in Ka-band, and design the Range-Doppler algorithm which well matches the proposed radar system with the modified signal parameters. Thus, we can extend the integration time of the convolution process in slow-time and it leads to the improvement of the SAR image quality. To verify the performance of our proposed technique, we process the practical experiments at conventional outdoor fields. Furthermore, the proposed method is operated on Range Doppler Algorithm (RDA), which is mostly used for standard SAR.