Analysis and Correction of Time Delay Active Radar Calibrator Imaging for High-resolution SAR
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摘要: 延时有源定标器是合成孔径雷达(Synthetic Aperture Radar, SAR)图像质量评估和辐射定标的关键设备，有源定标器延时技术的采用可以降低本地杂波的影响，提高测量精度。但其点目标成像质量不可避免地会受到延时的影响，尤其在高分辨率条件下更为严重。该文建立了高分辨率条件下延时对有源定标器点目标成像质量影响分析模型，定量地分析了不同延时对有源定标器点目标响应峰值功率、主瓣3 dB宽度、峰值旁瓣比和积分旁瓣比的影响程度，通过研究提出了一种延时影响的校正方法，仿真实验验证了该方法的正确性。Abstract: Time delay Active Radar Calibrator (ARC) is the crucial equipment for image quality evaluation and radiation calibration of Synthetic Aperture Radar (SAR). The technique of time delay in ARC will reduce the influence of local noise and improve the measure precision. However, the image quality of time delay ARC will be influenced inevitably, especially for high-resolution SAR. In this paper, the analysis model for image quality influence of ARC induced by time delay for high-resolution SAR is established. The effects induced by different time delay, including peak power, 3 dB width of main lobe, Peak Side Lobe Ratio (PSLR) and Integrated Side Lobe Ratio (ISLR) are analyzed quantificationally. A correction method of time delay is proposed, and the validity of the method is proved through simulation.
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Key words:
- SAR calibration /
- Active Radar Calibrator (ARC) /
- High resolution /
- Time-delayed
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