Fast antenna characterization via a sparse spherical multipole expansion
Fast antenna characterization via a sparse spherical multipole expansion
复制标题
通过稀疏球形多极展开进行快速天线表征
DOI：
10.1109/cosera.2016.7745731
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
C. Mecklenbrauker
中科院分区：
文献类型：
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作者：
David Loschenbrand;C. Mecklenbrauker
在高频下进行可靠的球形天线表征需要相当多的时间，并且通常会导致测量设施的低效使用。与标准技术相比，所提出的方法将球形天线扫描所需的样本数量减少了75%，从而能够显著加快扫描时间，而不会显著降低精度。这是通过适当的平移和旋转算子在球面多极展开中强制稀疏来实现的。在这种情况下，一种新的和准确的方法，相位中心估计建立依赖于1-范数最小化。此外，迭代重建算法被引入，其允许在连续优化的坐标系中重建欠采样的测量数据。使用合成和真实的测量数据的验证证明了所提出的方法的能力。
Reliable spherical antenna characterization at high frequencies requires a considerable amount of time and often leads to the inefficient use of measurement facilities. The proposed method cuts the number of necessary samples for spherical antenna scans by 75% as compared to standard techniques, thus enabling significantly faster scan times without significant loss of accuracy. This is achieved by enforcing sparsity in the spherical multipole expansion through suitable translation and rotation operators. In this context, a novel and accurate method for phase center estimation is established which relies on a 1-norm minimization. Further, an iterative reconstruction algorithm is introduced which allows for reconstruction of undersampled measurement data in a successively optimized coordinate system. Validation using both synthetic and real measurement data demonstrates the capabilities of the proposed method.