Very high-accuracy calibration of radiation pattern and gain of a near-field probe
Very high-accuracy calibration of radiation pattern and gain of a near-field probe
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DOI：
10.1109/eucap.2014.6902114
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
S. Pivnenko;J. M. Nielsen;O. Breinbjerg
中科院分区：
文献类型：
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作者：
S. Pivnenko;J. M. Nielsen;O. Breinbjerg
在本文中，非常高的精度校准的辐射方向图和增益的近场探头。在最近对欧洲航天局哨兵1号使命的C波段合成孔径雷达天线子系统的测量中使用了一种开口波导近场探头。测量已与平面近场技术，其中探头的不确定性是直接贡献的SAR仪器的最终不确定性。因此，鉴于哨兵1号使命的不确定性要求，对探头校准不确定性设定了非常严格的要求，3 dB波束宽度内的方向性为0.03 dB（3 sigma），增益为0.10 dB（3 sigma）。为了达到所要求的不确定度，进行了广泛的调查，涉及的球面近场技术用于探头校准的所有不确定性来源的详细研究。介绍并讨论了调查结果，说明了显着的不确定度来源及其补偿方法，以实现所需的探头校准不确定度。
In this paper, very high-accuracy calibration of the radiation pattern and gain of a near-field probe is described. An open-ended waveguide near-field probe has been used in a recent measurement of the C-band Synthetic Aperture Radar (SAR) Antenna Subsystem for the Sentinel 1 mission of the European Space Agency. The measurement has been performed with the planar near-field technique in which the probe uncertainty is directly contributing to the final uncertainty of the SAR instrument. Thus, given the uncertainty requirements for the Sentinel 1 mission, very stringent requirements were set for the probe calibration uncertainty, 0.03 dB (3 sigma) for the directivity within the 3 dB beamwidth and 0.10 dB (3 sigma) for the gain. In order to achieve the requested uncertainty, an extensive investigation was carried out involving a detailed study of all uncertainty sources in the spherical near-field technique used for the probe calibration. The results of the investigation illustrating the significant uncertainty sources and the ways of their compensation to achieve the required probe calibration uncertainty are presented and discussed.