| 摘要: |
| 为了解决零中频接收数字阵列波束合成的镜像抑制问题，从推导单通道零中频接收模型出发，首先给出了零中频接收数字阵列的数学模型，然后对同时存在通道间幅相误差、通道内I/Q不平衡误差时的阵列波束图、波束合成的镜像抑制性能进行理论分析。依据分析结果，阵列各通道引入随机辅助相位，提出了一种无需对通道内I/Q不平衡误差进行测量、波束合成输出镜像抑制比与阵元个数有关、适合于大规模数字阵列的波束合成镜像抑制方法。仿真实验验证了本文理论分析和所提方法的正确性。 |
| 关键词: 零中频接收机 数字阵列波束合成 镜像抑制比 I/Q不平衡 |
| DOI：DOI:10.3969/j.issn.1672-2337.2024.02.010 |
| 分类号:TN958.2； TN957.5 |
| 基金项目: |
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| Performance Analysis and Method of Image⁃Rejection for Zero⁃IF Receiving Digital Array |
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JIA Kexin， WU Ruirong
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The 38th Research Institute of China Electronics Technology Group Corporation, Hefei 230088, China
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| Abstract: |
| To solve the problem of image rejection in zero intermediate frequency （IF） receiving digital array beamforming, a single channel zero?IF receiving model is derived. Firstly, a mathematical model of zero?IF receiving digital array is present. A theoretical analysis is then conducted to the array pattern and the image rejection ratio （IRR） performance of beamforming when there are both amplitude and phase errors between channels and in?phase/quadrature （I/Q） imbalance errors within channels. Based on the analysis results, random auxiliary phases are introduced into each channel of the digital array, and a beamforming image rejection method suitable for large?scale digital arrays without the need for I/Q imbalance error measurement is proposed. The IRR of the proposed method is related to the number of array elements. The simulation experiments have verified the correctness of the theoretical analysis and the proposed method in this paper. |
| Key words: zero⁃IF receiver digital array beamforming image rejection ratio in⁃phase/quadrature （I/Q） imba⁃lance |
