Investigation on the Space-Time Waveform Encoding Single Phase Center Multiple Azimuth Beam Sliding Spotlight SAR for Ultra-High Resolution and Wide Swath Imaging

2015 ◽  
Author(s):  
Liu Yadong Liu Yadong ◽  
Chen Qian Chen Qian ◽  
Zhang Qingjun Zhang Qingjun ◽  
Liu Jie Liu Jie ◽  
Yang Shuangjing Yang Shuangjing ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Phase ◽  
Space Time ◽  
Phase Center ◽  
Time Waveform ◽  
Wide Swath

scholarly journals Azimuth Phase Center Adaptive Adjustment upon Reception for High-Resolution Wide-Swath Imaging

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4277 ◽  
Author(s):  
Xu ◽  
Hu ◽  
Huang ◽  
Tan ◽  
Dong
Keyword(s):  
High Resolution ◽  
Pulse Repetition Frequency ◽  
Phase Center ◽  
Uniform Sampling ◽  
Multichannel Systems ◽  
Adaptive Adjustment ◽  
Non Uniform Sampling ◽  
Channel Errors ◽  
Receive Antenna ◽  
Wide Swath

A spaceborne azimuth multichannel synthetic aperture radar (SAR) system can effectively realize high resolution wide swath (HRWS) imaging. However, the performance of this system is restricted by its two inherent defects. Firstly, non-uniform sampling is generated if the pulse repetition frequency (PRF) deviates from the optimum value. Secondly, multichannel systems are very sensitive to channel errors, which are difficult to completely eliminate. In this paper, we propose a novel receive antenna architecture with an azimuth phase center adaptive adjustment which adjusts the phase center position of each sub-aperture to improve multichannel SAR system performance. On one hand, the optimum value of the PRF can be adaptively adjusted within a certain range by adjusting receiving phase centers to obtain uniform azimuth sampling. On the other hand, false targets introduced by residual channel errors after azimuth multichannel error compensation can be further suppressed. The effectiveness of the proposed method to compensate for non-uniform sampling and suppress false targets is verified by simulation experiments.

Efficiency and Robustness Improvement of Airborne SAR Motion Compensation With High Resolution and Wide Swath

2020 ◽  
pp. 1-5
Author(s):  
Jianlai Chen ◽  
Buge Liang ◽  
Junchao Zhang ◽  
De-Gui Yang ◽  
Yuhui Deng ◽  
...  
Keyword(s):  
High Resolution ◽  
Motion Compensation ◽  
Airborne Sar ◽  
Wide Swath

scholarly journals A Novel Orthogonal Waveform Separation Scheme for Airborne MIMO-SAR Systems

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3580 ◽  
Author(s):  
Jie Wang ◽  
Ke-Hong Zhu ◽  
Li-Na Wang ◽  
Xing-Dong Liang ◽  
Long-Yong Chen
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Synthetic Aperture Radar ◽  
3D Imaging ◽  
Synthetic Aperture ◽  
Separation Scheme ◽  
Sar Images ◽  
Wide Swath ◽  
Aperture Radar

In recent years, multi-input multi-output (MIMO) synthetic aperture radar (SAR) systems, which can promote the performance of 3D imaging, high-resolution wide-swath remote sensing, and multi-baseline interferometry, have received considerable attention. Several papers on MIMO-SAR have been published, but the research of such systems is seriously limited. This is mainly because the superposed echoes of the multiple transmitted orthogonal waveforms cannot be separated perfectly. The imperfect separation will introduce ambiguous energy and degrade SAR images dramatically. In this paper, a novel orthogonal waveform separation scheme based on echo-compression is proposed for airborne MIMO-SAR systems. Specifically, apart from the simultaneous transmissions, the transmitters are required to radiate several times alone in a synthetic aperture to sense their private inner-aperture channels. Since the channel responses at the neighboring azimuth positions are relevant, the energy of the solely radiated orthogonal waveforms in the superposed echoes will be concentrated. To this end, the echoes of the multiple transmitted orthogonal waveforms can be separated by cancelling the peaks. In addition, the cleaned echoes, along with original superposed one, can be used to reconstruct the unambiguous echoes. The proposed scheme is validated by simulations.

scholarly journals A Modified SweepSAR Mode with Dual Channels for High Resolution and Wide Swath

2018 ◽  
Vol 18 (3) ◽  
pp. 199-205 ◽  
Author(s):  
Seong Sik Yoon ◽  
Jae Wook Lee ◽  
Taek-Kyung Lee ◽  
Sang-burm Ryu ◽  
Hyeon-Cheol Lee ◽  
...  
Keyword(s):  
High Resolution ◽  
Dual Channels ◽  
Wide Swath
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