SETI@home: Data Acquisition and Front-End Processing

Abstract

SETI@home is a radio Search for Extraterrestrial Intelligence (SETI) project, looking for technosignatures in data recorded at multiple observatories from 1998 to 2020. Most radio SETI projects analyze data using dedicated processing hardware. SETI@home uses a different approach: time-domain data is distributed over the Internet to $>10^5$ volunteered home computers, which analyze it. The large amount of computing power this affords ($\sim 10^{15}$ floating-point operations per second (FPOP/s)) allows us to increase the sensitivity and generality of our search in three ways. We use coherent integration, a technique in which data is transformed so that the power of drifting signals is confined to a single discrete Fourier transform (DFT) bin. We perform this coherent search over 123 000 Doppler drift rates in the range ($\pm$100 Hz s${}^{-1}$). Second, we search for a variety of signal types, such as pulsed signals and arbitrary repeated waveforms. The analysis uses a range of DFT sizes, with frequency resolutions ranging from 0.075 Hz to 1221 Hz. The front end of SETI@home produces a set of detections that exceed thresholds in power and goodness of fit. We accumulated $\sim 1.2\times 10^{10}$ such detections. The back end of SETI@home takes these detections, identifies and removes radio frequency interference (RFI), and looks for groups of detections that are consistent with extraterrestrial origin and that persist over long timescales. This paper describes the front end of SETI@home and provides parameters for the primary data source, the Arecibo Observatory; the back end and its results are described in a companion paper.

21 pages, 7 figures, 5 tables. Accepted to AJ

References in corpus (26)

• The ATNF Pulsar Catalogue
• Assessing statistical significance of periodogram peaks
• The Fundamental Performance of FAST with 19-beam Receiver at L Band
• The GALFA-HI Survey: Data Release 1
• HI Narrow Self-Absorption in Dark Clouds: Correlations with Molecular Gas and Implications for Cloud Evolution and Star Formation
• The Breakthrough Listen Search for Intelligent Life: 1.1-1.9 GHz observations of 692 Nearby Stars
• The Allen Telescope Array: The First Widefield, Panchromatic, Snapshot Radio Camera for Radio Astronomy and SETI
• The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars over 1.10-3.45 GHz
• A New 1.4GHz Radio Continuum Map of the Sky South of Declination +25 deg
• First detection of the pre-biotic molecule glycolonitrile (HOCH2CN) in the interstellar medium
• How Much SETI Has Been Done? Finding Needles in the n-Dimensional Cosmic Haystack
• The Breakthrough Listen Search for Intelligent Life: Public Data, Formats, Reduction and Archiving
• SETI Observations of Exoplanets with the Allen Telescope Array
• The Allen Telescope Array Fly's Eye Survey for Fast Radio Transients
• First SETI Observations with China's Five-hundred-meter Aperture Spherical radio Telescope (FAST)
• Seeding the Pregenetic Earth: Meteoritic Abundances of Nucleobases and Potential Reaction Pathways
• A Search for Technosignatures Around 31 Sun-like Stars with the Green Bank Telescope at 1.15-1.73 GHz
• An Opportunistic Search for ExtraTerrestrial Intelligence (SETI) with the Murchison Widefield Array
• The Breakthrough Listen Search for Intelligent Life: MeerKAT Target Selection
• SETIBURST: A Robotic, Commensal, Realtime Multi-Science Backend for the Arecibo Telescope
• The Application of Autocorrelation SETI Search Techniques in an ATA Survey
• Multibeam Blind Search of Targeted SETI Observations toward 33 Exoplanet Systems with FAST
• A Search for Technosignatures Around 11,680 Stars with the Green Bank Telescope at 1.15-1.73 GHz
• A Radio Technosignature Search of TRAPPIST-1 with the Allen Telescope Array
• Astropulse: A Search for Microsecond Transient Radio Signals Using Distributed Computing. I. Methodology
• SETI@home: Data Analysis and Findings

Cited by in corpus (1)

• SETI@home: Data Analysis and Findings