Interstellar

A Signal Discovery Step In Interstellar Communication

By Keith Cowing
Status Report
eess.SP
December 10, 2024
Filed under , , , , , , ,
A Signal Discovery Step In Interstellar Communication
Continuum noise power and FX complex correlator measurements, observed on MJD 60586, are presented together with the statistical power of 3.7 Hz bandwidth, 0.27 s duration polarized pulse pairs, recorded during the 123.8 day experiment. The high correlator response at 5.5 hr RA is due to the Orion A emission nebula at -5.4º DEC. [10][11]. Instrument delay difference of -82 ns between interferometer elements was compensated by choosing to display the -5 x 16 ns correlator tap. The bandwidth of the continuum and correlator measurements is approximately 50 MHz, at 0.27 s integration. The timedependent geometric space delay was not compensated, resulting in the approximate sawtooth phase response across RA, indicating a period of 0.117 hr RA. The prior pointing direction of interest indicates greater than 6 standard deviations Cohen’s d in the 5.1675 ± 0.00375 hr RA bin, within the prior range, 5.25 ± 0.15 hr RA. A second apparent response is indicated in two adjacent bins centered at 8.8425 hr RA, with apparent RA aliasing at ±0.12 hr RA. Figs. 2 and 3 show detail. — eess.SP

Prior work using synchronized, geographically spaced radio telescopes, and a radio interferometer, suggests that narrow-bandwidth polarized pulse pair measurements repeatedly falsify a noise-cause hypothesis, given a prior celestial direction of interest.

A four-step method was proposed, tested, and reported, using interferometer phase measurements, to seek common celestial directions among pulse pair components, during 92 days of observation.

In the work reported here, the proposed four-step signal discovery method is simplified to have a single step. A 123.8 day interferometer experiment provides measurement evidence supporting a hypothesis that the prior direction of interest, and a second direction of interest, are associated with celestial coordinates.

Each pointing direction measures statistical power at greater than six standard deviations, with some indications of associated interferometer-induced Right Ascension aliasing. Explanations are proposed and discussed.
Comments: 13 pages, 21 figures
Subjects: Signal Processing (eess.SP); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2412.06658 [eess.SP](or arXiv:2412.06658v1 [eess.SP] for this version)
https://doi.org/10.48550/arXiv.2412.06658
Focus to learn more
Submission history
From: William Crilly Jr
[v1] Mon, 9 Dec 2024 16:57:52 UTC (2,910 KB)
https://arxiv.org/abs/2412.06658

Astrobiology, SETI,

Keith Cowing

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

Follow on Twitter
MORE FROM Interstellar