Joint FPGA and Multi-DSP SAR Efficient Imaging System Based on WFBP Algorithm
- Resource Type
- Conference
- Authors
- Lu, Sikun; Song, Yue; Zhang, Yongwei; Li, Zhongyu; Wu, JunJie; Yang, JianYu
- Source
- IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium Geoscience and Remote Sensing Symposium, IGARSS 2023 - 2023 IEEE International. :8110-8113 Jul, 2023
- Subject
- Aerospace
Components, Circuits, Devices and Systems
Fields, Waves and Electromagnetics
Geoscience
Signal Processing and Analysis
Interpolation
Splicing
Signal processing algorithms
Imaging
Geoscience and remote sensing
Signal processing
Real-time systems
WFBP
Efficient signal processing system
DSPs
- Language
- ISSN
- 2153-7003
The joint FPGA and multi-DSP imaging architecture has found widespread use in airborne SAR and satellite-based SAR. However, traditional back-projection (BP) algorithms are not efficient enough for real-time imaging. This paper proposes a back-projection algorithm based on wavenumber-domain spectral splicing (WFBP) for designing an efficient SAR imaging system. A unified polar coordinate system is employed in this work to project the sub-aperture imaging results, which eliminates the need for a large amount of interpolation and multiple projection transformations. Furthermore, spectral shifting is applied to eliminate the effects caused by wavenumber-domain spectral overlap. Experimental results demonstrate that the WFBP algorithm reduces the imaging time by 64% compared to the traditional BP algorithm.