A Wideband Spectrometer with RFI Detection

A Wideband Spectrometer with RFI Detection
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具有 RFI 检测功能的宽带光谱仪

DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
G. Nita
G. Nita
中科院分区：
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文献类型：
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作者：
D. Gary;Zhiwei Liu;G. Nita

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我们报告了 500 MHz 瞬时带宽宽带光谱仪的设计和构造，其中包括自动射频干扰 (RFI) 检测。该实现基于天文信号处理和电子研究中心 (CASPER) 开发的硬件。该光谱仪的独特之处在于它会累积功率和功率平方，然后用于开发光谱峰度 (SK) 估计器。 SK 估计器统计数据用于实时检测和消除嵌入在接收信号中的某些类型的 RFI。我们报告了该光谱仪在韩国太阳射电爆发定位器（KSRBL）中的使用情况。该仪器并行利用四个 500 MHz 带宽 SK 光谱仪，以实现在整个 0.24-18 GHz 射频范围内时分复用的 2 GHz 瞬时带宽，以研究太阳爆发。介绍了在该范围内消除 RFI 的光谱仪的性能。研究发现，该算法对于消除高度间歇性的 RFI 特别有用，但对于数字信号导致的 RFI 不太成功。我们提出了一种称为多尺度 SK 的方法，该方法解决了基于峰度的估计器对 50% 占空比 RFI 的已知盲目性。 SK 算法还可以在相关之前应用于光谱通道，以从干涉仪数据中消除不需要的 RFI。
We report on the design and construction of a wideband spectrometer of 500 MHz instantaneous bandwidth that includes automatic radio frequency interference (RFI) detection. The implementation is based on hardware developed at the Center for Astronomical Signal Processing and Electronics Research (CASPER). The unique aspect of the spectrometer is that it accumulates both power and power-squared, which are then used to develop a spectral kurtosis (SK) estimator. The SK estimator statistics are used for real-time detection and excision of certain types of RFI embedded in the received signal. We report on the use of this spectrometer in the Korean Solar Radio Burst Locator (KSRBL). This instrument utilizes four of these 500 MHz bandwidth SK spectrometers in parallel, to achieve a 2 GHz instantaneous bandwidth that is time multiplexed over the entire 0.24–18 GHz radio frequency range, to study solar bursts. The performance of the spectrometers for excising RFI over this range is presented. It is found that the algorithm is especially useful for excising highly intermittent RFI but is less successful for RFI due to digital signals. A method we call multiscale SK is presented that addresses the known blindness of Kurtosis-based estimators to 50% duty-cycle RFI. The SK algorithm can also be applied to spectral channels prior to correlation to remove unwanted RFI from interferometer data.