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| Citation: | Zhao Bo, Huang Lei, Zhou Hanfei, Zhang Liang, Li Qiang, Huang Min. 1-bit SAR Imaging Method Based on Single-frequency Time-varying Threshold[J]. Journal of Radars, 2018, 7(4): 446-454. doi: 10.12000/JR18036
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1-bit SAR Imaging Method Based on Single-frequency Time-varying Threshold
DOI: 10.12000/JR18036
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Abstract
This paper proposes a 1-bit Synthetic Aperture Radar (SAR) imaging method based on a single-frequency time-varying threshold. Synthetic aperture radar echoes are quantized to 1-bit sampling data by comparing the data with the threshold; this reduces the data-width of the SAR echoes, consequently simplifying the system and improving efficiency. The conventional 1-bit sampling compares the signal to a zero threshold, bringing nonlinear distortion to the relative amplitude and degrading the imaging quality. The random threshold can keep the amplitude information, but it introduces additional noise-like interferences. In contrary, the single-frequency time-varying threshold can maintain the amplitude information lost during the 1-bit sampling and quantization, and at the same time, eliminate noise-like interferences; thus, the imaging quality of SAR using 1-bit sampling and quantization can be improved. The focusing quality and the amplitude-maintaining ability of the proposed approach is quantitatively analyzed, and the effectiveness of the approach is verified by an imaging experiment on a scene. -
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References
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- Figure 1. Realization block of multiplication
- Figure 2. High resolution range profile of the single scatterer
- Figure 3. High resolution range profile of multiple scatterers
- Figure 4. 2-Dimension SAR imaging results
- Figure 5. 2-Dimension SAR imaging results (Local)