| 摘要: |
| 近年来，雷达前视成像技术由于具备广泛的应用价值越来越受到重视，超分辨卷积反演技术是实现前视成像的一种重要技术途径。然而，基于阵列体制的扫描雷达在大范围扫描时会产生天线方向图空变，导致超分辨性能下降。针对该问题，提出了一种适用于阵列扫描雷达的前视稀疏超分辨成像方法。首先，考虑并分析了天线方向图空变性的产生原因，导出了修正天线卷积矩阵，实现了对扫描过程的精准表征；其次，在目标稀疏假设的前提下，构建了相应的目标函数；最后，采用基于重加权策略的交替方向乘子法(Alternating Direction Method of Multipliers，ADMM)方法求解目标函数，实现了稀疏目标有效重建。实验结果表明，所提方法能实现4倍左右的分辨率提升，能有效提升雷达对前视目标区域的探测感知能力。 |
| 关键词: 阵列扫描雷达 超分辨技术 大范围扫描 方向图空变 稀疏重建 |
| DOI：10.20079/j.issn.1001-893x.240322001 |
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| 基金项目: |
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| A Forward-looking Sparse Super-resolution Imaging Method for Array Scanning Radar |
| WANG Honglin |
| (DFINE Technology Co.,Ltd.,Chengdu 610041,China) |
| Abstract: |
| In recent years,radar forward-looking imaging technology has received more and more attention due to its wide application value.Super-resolution convolution inversion technology is an important technical mean to achieve forward-looking imaging.However,scanning radar based on phased array will produce space variation of antenna pattern during large-scale scanning,resulting in super-resolution performance degradation.To address this problem,a forward-looking sparse super-resolution imaging method is proposed for phased array scanning radar.Firstly,the reasons for the space variation of the antenna pattern are analyzed,and a modified antenna convolution matrix is derived to achieve an accurate representation of the scanning process.Secondly,the corresponding objective function is constructed under the premise of target sparsity assumption.Finally,alternating direction method of multipliers(ADMM)solver based on reweighting strategy is used to solve the objective function,achieving sparse reconstruction of the target.The experimental data results show that the proposed method can achieve a resolution increase of about 4 times,and can effectively improve the observation and perception capabilities of the forward-looking area. |
| Key words: array scanning radar super-resolution technique large-scale scanning space variation of antenna pattern sparse reconstruction |
