Energy Equalization in Echo Separation Processing Architecture Based on Airborne STWE-SAR Data
- Resource Type
- Conference
- Authors
- Han, Shuo; Deng, Yunkai; Wang, Pei; Zhao, Qingchao; Qiu, Jinsong; Zhang, Yongwei; Wang, Wei; Ai, Zhanyang
- Source
- IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium Geoscience and Remote Sensing Symposium, IGARSS 2022 - 2022 IEEE International. :2999-3002 Jul, 2022
- Subject
- Aerospace
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Geoscience
Photonics and Electrooptics
Power, Energy and Industry Applications
Signal Processing and Analysis
Radar remote sensing
Spaceborne radar
Apertures
Encoding
Time-domain analysis
Synthetic aperture radar
Digital beamforming
high-resolution and wide-swath (HRWS)
space-time waveform encoding (STWE)
synthetic aperture radar (SAR)
linear constrained minimum variance (LCMV)
- Language
- ISSN
- 2153-7003
Space-Time Waveform-Encoding (STWE)-synthetic aperture radar (SAR) enables waveform diversity in the space-time domain to meet the requirements of future high-resolution and wide-swath (HRWS) missions. The STWE-SAR receives echoes from multiple sub-swaths simultaneously with a single receive window. The overlapping echoes are usually separated based on the linear constrained minimum variance (LCMV) beamformer. However, the energy of the echoes from different sub-swaths can have a huge difference in the time domain. The conventional LCMV beamformer cannot effectively separate the overlapped echoes because the echo energy difference is not considered. Based on airborne STWE-SAR data, this paper performs energy equalization pre-processing before echo overlapping. Moreover, this paper confirms that the echo discrepancy is worth considering in the STWE system by comparing the separation results of the LCMV beamformer before and after energy equalization. This paper recommends that the design of future echo separation schemes needs to focus not only on the echo arrival of angle but also on the echo energy based on the actual situation.