Revised multiplet scoring function.
New way of computing "# signals" factor in multiplet score: use incomplete gamma function to find the probability of finding at least M signals (# of signals in multiplet, before overlap pruning) given the total # of signals in disc and the relative size of the frequency band used in forming the multiplet.
Changed nd_factor to use just the number of signals in the multiplet and in the disc.
Add time factor based on entropy over pixel observing intervals
Removed time factor from multiplet score; added web interface for bounding multiplet time range.
Multiplet scoring: if time span of the multiplet is < 60 sec, penalize it by 100. This replaces the "time entropy" approach.
Add time entropy condition to drifting RFI algorithm
Fix bugs in redundant multiplet removal.
Eliminate redundant multiplets
Fixes to birdie generation. Increased precision for time representation. 1000 birdies, 100K pixels score.
Fixed bug that caused pixels to have NaN or Inf scores. Scored only 100K pixels (so not all birdie pixels have been scored).
20K birdies, 1.2M pixels: ~25M multiplets
Increase # of birdies to 20K (10K each bary, nonbary)
Updated formula for time entropy
Use appropriate signal duration in multiplet overlap pruning
The power of a sinusoid in an FFT bin depends on where it is in the bin. Take this into account when computing birdie signals. Also, raise the power range of birdies.
Limit birdie spikes to 8 per WU (this time for sure)
Limit 8 spikes per WU for birdie signals, to mimic the client
Generate birdie spikes in a way that reflects how the S@h client works.
various bug fixes
Include multiplet signals per observation; don't penalize frequency variation in non-bary multiplets.
Model planetary occlusion for birdies (don't generate signals when imaginary transmitter is on far side of planet).
Changed non-barycentric birdie generation. Now support planetary and nonplanetary (orbital) transmitters around a variety of planets, both HZ and non-Hz planets. Stellar sizes distributed as local mass function, HZ bounds set by luminosity.
When we find a multiplet, see if we can increase the score by sliding the window so that the multiplet is at the bottom
©2020 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.