CASPER, There were some discussions at the recent CASPER workshop about real-time RFI mitigation.
During the course of these discussions, I pointed out that there was a statistical detection/replacement block linked on the CASPER website (but not in the library) - https://casper.berkeley.edu/wiki/Impulsive_RFI_Mitigation:_A_Lightweight_Detector_for_Multiplexed_Channels_Data_Stream The Green Bank Observatory has now successfully tested this block using one of our smaller telescopes (results: http://www.gb.nrao.edu/20m/peak/UNKNOWN/2018_10_22_15:20:44.htm). This test duplicated the X-pol, and labeled the unmitigated x-pol as 'xx1/xx2', and labeled the mitigated x-pol as 'yy1/yy2'. Detected RFI was replaced with random samples, not zeros. The telescope was pointed in the direction of a known RADAR, but not at any specific astronomical source. We took 2 liberties with this test for simplicity's sake (so immediate performance improvements may be possible) - no off/on source calibration (did on/on), and used a rather short calibration dataset. Calibration in both cases refers to the calibration done by the 'clear' register in the first link. Anyways, we intend to conduct further tests, but I wanted to make the CASPER community aware of a working, statistical, real-time RFI-mitigation block that is available. Questions, comments, and suggestions welcome. -Luke Hawkins -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
