| 摘要: |
| 机载合成孔径雷达（SAR）利用雷达与目标的相对运动，将尺寸较小的天线用数据处理的方法等效合成较大的天线孔径的雷达。随着雷达阵列技术的发展，机载数字阵列SAR成像技术得以工程应用。但因宽带数字阵列的时延补偿带来了带宽损失，在SAR成像过程中用于脉压的调频斜率须进行一定的优化，才能得到更好的成像效果。本文首先介绍了数字阵列SAR雷达的时延和相位补偿方法以及因时延补偿带来的调频斜率的变化，其次针对调频斜率的失配对脉压结果的影响分析及其内在原因，最后结合飞行试验和地面试验数据对宽带数字阵列SAR成像优化方法进行了验证。该方法对数字阵列SAR雷达成像优化具有一定意义。 |
| 关键词: 合成孔径雷达 宽带数字阵列雷达 波束形成 时延补偿 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.02.014 |
| 分类号:TN958.92；TN957 |
| 基金项目: |
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| A Method for Optimizing the Imaging of Airborne Broadband Digital Array SAR |
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WENG Yuanlong，SUN Long，WU Bocai
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The 38th Research Institute of China Electronics Technology Group Corporation，Hefei 230088，China
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| Abstract: |
| Synthetic aperture radar (SAR) uses the relative motion between radar and target to synthesize a smaller antenna with a larger antenna aperture. With the development of radar array technology，airborne digital array SAR imaging technology has been applied in engineering. However，the delay compensation of the wideband digital array brings bandwidth loss. In the SAR imaging process，the frequency modulation slope for pulse compression needs to be optimized to obtain better imaging results. This paper first introduces the delay and phase compensation methods of digital array SAR radar and the variation of the frequency modulation slope due to delay compensation. Secondly，the influence analysis of the mismatched pulse compression results of the frequency modulation slope and its inherent causes. Finally，the optimization method of wideband digital array SAR imaging is verified by flight test and ground test data. This method is of significance for the optimization of digital array SAR imaging. |
| Key words: synthetic aperture radar（SAR） wideband digital array radar digital beamforming（DBF） delay compensation |
