作为RFI算法测试平台的软件关联函数
Software correlators as testbeds for RFI algorithms
摘要：
相关器技术提供了从干涉测量观测中识别和/或消除射频干扰（RFI）的可能性，其时间和/或频率分辨率比最终可见度数据集通常可能的分辨率高得多。由于相关过程的相当大的计算要求，交叉分频器最常使用高速数字信号处理板来实现，这通常需要很长的开发时间，并且一旦完成就难以改变。另一方面，“软件”关联函数利用商品服务器机器和以高级语言编码的关联算法。它们本质上更灵活，并且可以比专用“硬件”关联函数更快地开发和修改。因此，软件关联函数是测试干涉仪的新RFI检测和缓解技术的自然选择。软件关联函数可用于测试RFI检测算法，这一点通过在广泛使用的DiFX软件相关器中添加峰度检测和绘图得到了证明，该软件相关器突出了Hancock VLBA台站先前未知的短时RFI。
英文摘要：
In-correlator techniques offer the possibility of identifying and/or excising radio frequency interference (RFI) from interferometric observations at much higher time and/or frequency resolution than is generally possible with the final visibility dataset. Due to the considerable computational requirements of the correlation procedure, cross-correlators have most commonly been implemented using high-speed digital signal processing boards, which typically require long development times and are difficult to alter once complete. "Software" correlators, on the other hand, make use of commodity server machines and a correlation algorithm coded in a high-level language. They are inherently much more flexible and can be developed - and modified - much more rapidly than purpose-built "hardware" correlators. Software correlators are thus a natural choice for testing new RFI detection and mitigation techniques for interferometers. The ease with which software correlators can be adapted to test RFI detection algorithms is demonstrated by the addition of kurtosis detection and plotting to the widely used DiFX software correlator, which highlights previously unknown short -duration RFI at the Hancock VLBA station.
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