| 引用本文: | 贾高伟,阴鹏,邵帅.面向飞行器电磁散射特征诊断的近场频域成像算法.[J].国防科技大学学报,2023,45(6):10-19.[点击复制] |
| JIA Gaowei,YIN Peng,SHAO Shuai.Near-field frequency domain imaging algorithm about the aircraft′s scattering characteristics diagnosis[J].Journal of National University of Defense Technology,2023,45(6):10-19[点击复制] |
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| 面向飞行器电磁散射特征诊断的近场频域成像算法 |
| 贾高伟，阴鹏，邵帅 |
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(国防科技大学 空天科学学院, 湖南 长沙 410073)
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| 摘要: |
| 无人机在结构样式和材料构成方面具有的灵活性使得其相比有人机具有更大的隐身性能优化空间，在室内或者室外开展近场成像变得迫切。结合飞行器转台成像几何模型建立了近场转台成像通用信号模型，提出了一种面向飞行器电磁散射特征诊断的近场频域成像算法，在子孔径成像设置约束下，近似将斜距平面频谱按照水平面频谱处理；分析了该算法适用的条件，并围绕典型近场成像几何和飞行器尺寸生成仿真数据，在0.6~35 GHz范围内选择典型波段完成近场成像，良好的成像结果证实了理论分析与所提算法的正确性。 |
| 关键词: 飞行器 近场成像 SAR成像 转台模型 |
| DOI：10.11887/j.cn.202306002 |
| 投稿日期：2022-03-29 |
| 基金项目:国家自然科学基金资助项目（61801495） ； 湖南省科技创新计划资助项目（2021RC3077） |
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| Near-field frequency domain imaging algorithm about the aircraft′s scattering characteristics diagnosis |
| JIA Gaowei, YIN Peng, SHAO Shuai |
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(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073 , China)
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| Abstract: |
| The flexibility of UAV in structural style and material composition makes it have more space for stealth performance optimization than the manned aircraft, so it was urgent to carry out near-field imaging indoors or outdoors. Based on the imaging geometry model of aircraft turntable, a general signal model of near-field turntable imaging was established, and a near-field frequency-domain imaging algorithm for aircraft electromagnetic scattering feature diagnosis was proposed. Under the constraint of sub aperture imaging setting, the slant plane spectrum was approximately processed as the horizontal plane spectrum; the applicable conditions of the algorithm was analyzed, and simulation data around typical near-field imaging geometry and aircraft size was generated.The completes near-field imaging in the range of 0.6~35 GHz was performed. Good imaging results confirm the correctness of the theoretical analysis and the proposed algorithm. |
| Keywords: aircraft near-field imaging synthetic aperture radar imaging rotating model |
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