Near-Space TOPSAR Large-Scene Full-Aperture Imaging Scheme Based on Two-Step Processing

作者：Zhang, Qianghui; Wu, Junjie^*; Li, Wenchao; Huang, Yulin; Yang, Jianyu; Yang, Haiguang

来源：Sensors (Switzerland), 2016, 16(8): 1177.

DOI：10.3390/s16081177

• SAR
• near-space SAR
• TOPS
• sustained large-scene imaging
• two-step processing
• modified two-step processing

Free of the constraints of orbit mechanisms, weather conditions and minimum antenna area, synthetic aperture radar (SAR) equipped on near-space platform is more suitable for sustained large-scene imaging compared with the spaceborne and airborne counterparts. Terrain observation by progressive scans (TOPS), which is a novel wide-swath imaging mode and allows the beam of SAR to scan along the azimuth, can reduce the time of echo acquisition for large scene. Thus, near-space TOPS-mode SAR (NS-TOPSAR) provides a new opportunity for sustained large-scene imaging. An efficient full-aperture imaging scheme for NS-TOPSAR is proposed in this paper. In this scheme, firstly, two-step processing (TSP) is adopted to eliminate the Doppler aliasing of the echo. Then, the data is focused in two-dimensional frequency domain (FD) based on Stolt interpolation. Finally, a modified TSP (MTSP) is performed to remove the azimuth aliasing. Simulations are presented to demonstrate the validity of the proposed imaging scheme for near-space large-scene imaging application.

• 出版日期2016-8
• 单位电子科技大学