1. A Novel Weight Generator in Real-Time Processing Architecture of DBF-SAR.
- Author
-
Qiu, Jinsong, Zhang, Zhimin, Wang, Robert, Wang, Pei, Zhang, Huachun, Du, Jiang, Wang, Wei, Chen, Zhen, Zhou, Yashi, Jia, Hongying, and Sun, Huifeng
- Subjects
SYNTHETIC aperture radar ,SIGNAL processing ,SIGNAL sampling ,SPACE-based radar ,SYSTEMS design ,MULTICHANNEL communication - Abstract
Digital beamforming (DBF) with scan-on-receive (SCORE) technique in elevation is a powerful technique that enables a spaceborne synthetic aperture radar (SAR) to achieve high-resolution wide swath (HRWS) imaging. In the spaceborne DBF-SAR system, sampling signals from each channel are weighted by weights generated by a digital signal processing system in real-time. However, the contradiction between the shortage of spaceborne hardware resources and resource demand of the multichannel real-time signal processing increases the difficulty of system design. In order to solve this problem, a novel weight generator and an improved intermediate frequency (IF) DBF real-time processing architecture are proposed in this article. By taking advantage of the special properties of the SCORE algorithm, the proposed weight generator calculates weights using a linear polynomial algorithm. The simulation result shows that a low-order approximation can achieve high performance. The proposed generator can correct multichannel amplitude and phase error at a low cost on hardware resources. The effectiveness of the proposed method is verified by experiments with a raw data processing instance of an X-band 16 channels DBF-SAR. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF