SETI@home uses frequency histograms to spot frequencies where we've detected an inordinate number of radio signals. Such a "spike" of signals at a particular frequency is typically representative of either test signals injected into our data recorder (to verify proper functioning) or RFI that uses specific transmission frequencies.
 click to enlarge |
 click to enlarge |
Above are two sample frequency histograms taken from signal spike data recorded on May 24, 2000. The histogram on the left plots all spikes recorded on that day; the one on the right ignores artificially injected spikes at 1418MHz, 1420Mhz, and 1421Mhz. Also viewable are power histograms from the same day.
Copyright ©2001 SETI@home