The use of pulses with compensating delays as call signals of the CETI system

Gindilis, L. M.

doi:10.1007/bf01031464

Cited by 2 publications

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“…The choice of band might also depend on the nature of the signal. For pulsed signals with compensating delays, the optimum frequency was found to be 56 GHz (λ = 5.35 mm) [50,51,52]. One more approach was proposed in 1991 by L.M.…”

Section: Optimum Wavelengths For Interstellar Communicationmentioning

confidence: 99%

SETI in Russia, USSR and the post-Soviet space: a century of research

Gindilis¹,

Gurvits

2019

Acta Astronautica

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Studies on extraterrestrial civilisations in Russia date back to the end of the 19th century. The modern period of SETI studies began in the USSR in the early 1960s. The first edition of the I.S. Shklovsky's book Universe, Life, Intelligence published in 1962 was a founding stone of SETI research in the USSR. A number of observational projects in radio and optical domains were conducted in the 1960s-1990s. Theoretical studies focused on defining optimal spectral domains for search of artificial electromagnetic signals, selection of celestial targets in search for ETI, optimal methods for encoding and decoding of interstellar messages, estimating the magnitude of astro-engineering activity of ETI, and developing philosophical background of the SETI problem. Later, in the 1990s and in the first two decades of the 21st century, in spite of acute underfunding and other problems facing the scientific community in Russia and other countries of the former Soviet Union, SETI-oriented research continued. In particular, SETI collaborations conducted a number of surveys of Sun-like stars in the Milky Way, searched for Dyson spheres and artificial optical signals. Several space broadcasting programs were conducted too, including a radio transmission toward selected stars. Serious rethinking was given to incentives for passive and active participation of space civilisations in SETI and CETI. This paper gives an overview of past SETI activities. It also gives a comprehensive list of publications by authors from Russia, the Soviet Union and the post-Soviet space, as well as some SETI publications by other authors. The rich heritage of SETI research presented in the paper might offer a potentially useful background and starting point for developing strategy and specific research programs of the near future.

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Section: Optimum Wavelengths For Interstellar Communicationmentioning

confidence: 99%

SETI in Russia, USSR and the post-Soviet space: a century of research

Gindilis¹,

Gurvits

2019

Acta Astronautica

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How Much SETI Has Been Done? Finding Needles in the n-dimensional Cosmic Haystack

Wright

Kanodia

Lubar

2018

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Many articulations of the Fermi Paradox have as a premise, implicitly or explicitly, that humanity has searched for signs of extraterrestrial radio transmissions and concluded that there are few or no obvious ones to be found. Tarter et al. (2010) and others have argued strongly to the contrary: bright and obvious radio beacons might be quite common in the sky, but we would not know it yet because our search completeness to date is so low, akin to having searched a drinking glass's worth of seawater for evidence of fish in all of Earth's oceans. Here, we develop the metaphor of the multidimensional "Cosmic Haystack" through which SETI hunts for alien "needles" into a quantitative, eight-dimensional model, and perform an analytic integral to compute the fraction of this haystack that several large radio SETI programs have collectively examined. Although this model haystack has many qualitative differences from the Tarter et al. (2010) haystack, we conclude that the fraction of it searched to date is also very small: similar to the ratio of the volume of a large hot tub or small swimming pool to that of the Earth's oceans. With this article, we provide a Python script to calculate haystack volumes for future searches and for similar haystacks with different boundaries. We hope this formalism will aid in the development of a common parameter space for the computation of upper limits and completeness fractions of search programs for radio and other technosignatures.

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The use of pulses with compensating delays as call signals of the CETI system

Cited by 2 publications

References 0 publications

SETI in Russia, USSR and the post-Soviet space: a century of research

SETI in Russia, USSR and the post-Soviet space: a century of research

How Much SETI Has Been Done? Finding Needles in the n-dimensional Cosmic Haystack

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