Project Argus and the Challenge of Real-Time All-Sky Seti

1997 ◽  
Vol 161 ◽  
pp. 693-700
Author(s):  
H. Paul Shuch
Keyword(s):  
Real Time ◽  
Radio Telescope ◽  
Government Support ◽  
Exact Nature ◽  
Small Satellite ◽  
Radio Observatory ◽  
Non Profit ◽  
Independent Verification

AbstractProject Argus, a global effort of the non-profit SETI League, Inc., seeks to achieve continuous microwave monitoring of all four pi steradians of space, in real time. This most ambitious SETI project ever undertaken without benefit of Government support will ultimately involve 5,000 small radiotelescopes worldwide, built, maintained and operated by private individuals (primarily radio amateurs and microwave experimenters), coordinated so as to miss no likely candidate signals, and providing independent verification of any interesting signals detected. Prototype stations went into operation in 1996; full sky coverage is planned for 2001. Sensitivity and range are assessed by comparison of current capabilities to those in place at the Ohio State Radio Observatory nineteen years ago, when the so-called «Wow!» signal was detected. The «Wow!» signal serves as a convenient benchmark, even though its exact nature remains unknown. Should a similar candidate signal appear during the fully deployed phase of Project Argus, it will not evade detection. Though utilizing just a small satellite TV dish as its antenna, each station achieves range and sensitivity on a par with the Ohio State Big Ear radio telescope, circa 1977. This paper explores the technological breakthroughs which have made this level of performance possible.

Time Variation of the Radio Emission from Sco X-1

1969 ◽  
Vol 1 (5) ◽  
pp. 237-240 ◽  
Author(s):  
J. G. Ables
Keyword(s):  
Radio Emission ◽  
Radio Telescope ◽  
Time Variation ◽  
Radio Observatory ◽  
Half Power

The radio object associated with Sco X—1 noted by Andrew and Purton has been observed at a wavelength of 6 cm with the 210 ft radio telescope at the Australian National Radio Observatory, Parkes. At this wavelength the half-power antenna beamwidth is 4′ arc.

Design of Semi-Physical Simulation for Small Satellite by Virtual Display

2011 ◽  
Vol 130-134 ◽  
pp. 2684-2687 ◽  
Author(s):  
Kai Xu ◽  
Yan Lv ◽  
Guang Jin
Keyword(s):  
Control System ◽  
Real Time ◽  
Attitude Control ◽  
Physical Simulation ◽  
Simulation System ◽  
Space Environment ◽  
Small Satellite ◽  
Attitude Control System ◽  
Actual Environment ◽  
Virtual Display

Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However, the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment, the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology, the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment, the simulation computer, high-precision single-axis air-bearing turntable, reaction wheel, air thrust device, fiber gyroscopes, sensors synchronizer, power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time, Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient.

Good Data, Good Law

2021 ◽  
Vol 33 (4) ◽  
pp. 262-264
Author(s):  
John Tilley ◽  
Serena Chang ◽  
Richard J. Peay
Keyword(s):  
Real Time ◽  
Racial Disparity ◽  
Prison Population ◽  
Time Data ◽  
Policy Makers ◽  
Non Profit ◽  
Life Years ◽  
Mandatory Minimums ◽  
Visualization Tools ◽  
Data Driven Decisions

Real-time data is crucial in delivering actionable information, yet sparse in the criminal justice space. Often, practitioners and policy makers (“System Actors”), are forced to rely on information that is missing, incorrect, and/or outdated. Recidiviz, a nonpartisan tech non-profit, enables System Actors to make data-driven decisions as part of their regular workflows. This article describes Recidiviz’s work modeling the projected influence of eliminating mandatory minimums in Virginia, including state costs avoided, impact on the prison population, and number of life-years individuals would regain by avoiding incarceration. Recidiviz calculated that if Virginia eliminated mandatory minimums for drug sales offenses only, over the next five years, it could avoid a cumulative $11.6 million in incarceration costs, give 360 years of life back to people, and decrease the prison population’s racial disparity. If Virginia eliminated all mandatory minimums, as SB 5046 proposes, it could help the Commonwealth avoid $80.2 million in costs and give back 2,496 years of life over five years. In addition to policy impact modeling, Recidiviz’s core work is in partnering with state corrections and supervision departments to provide real-time feedback and data visualization tools.

Real-time Closed-loop Active Surface Technology of a Large Radio Telescope

2022 ◽  
Vol 134 (1031) ◽  
pp. 015003
Author(s):  
Yong Zhang ◽  
Guoping Li ◽  
Guohua Zhou ◽  
Qishuai Lu ◽  
Heng Zuo ◽  
...  
Keyword(s):  
Real Time ◽  
Radio Telescope ◽  
Closed Loop ◽  
Preliminary Test ◽  
Active Surface ◽  
Angle Measurement ◽  
Quality Data ◽  
Surface Accuracy ◽  
Surface System ◽  
Reflector Surface

Abstract The surface accuracy of a large radio telescope’s primary reflector is easily affected by gravity and temperature change during observations. An active surface system is crucial to ensure the regular operation and high-quality data output of the radio telescope. We propose a real-time closed-loop active surface system including two components. The first component, a new type of photoelectric edge sensor, detects the angle change of the adjacent panels. The second component, the displacement actuator, adjusts the panels’ position and posture to compensate for the angle changes. So, over the entire observation, the closed-loop surface control system with these two components could actively maintain the primary reflector’s accuracy in real time. Using this approach, we constructed an experimental active surface system for the Xinjiang Qitai 110 m Radio Telescope (QTT) to test the maintenance of the surface accuracy. The angle measurement accuracy is better than 0.″2, and the positioning accuracy of the displacement actuator could achieve ±15 μm over the whole 50 mm stroke. The preliminary test results show that the accuracy requirements of the QTT’s primary reflector surface can be met using the active surface system we propose.

Data storage and real time observations at the Mexican Array Radio Telescope

2010 ◽  
Vol 46 (7) ◽  
pp. 968-972
Author(s):  
Gilberto A. Casillas-Pérez ◽  
Solai Jeyakumar ◽  
Armando Carrillo-Vargas ◽  
Ernesto Andrade ◽  
Americo González-Esparza ◽  
...  
Keyword(s):  
Real Time ◽  
Data Storage ◽  
Radio Telescope

scholarly journals Extending the Observable Zenith Angle of FAST Using an Offset Feed

2001 ◽  
Vol 182 ◽  
pp. 255-259
Author(s):  
Li Guoding ◽  
R. Nan ◽  
B. Peng
Keyword(s):  
Real Time ◽  
Active Control ◽  
Radio Telescope ◽  
Zenith Angle ◽  
Spherical Reflector ◽  
Paraboloid Of Revolution ◽  
Reflecting Surface

AbstractThe five hundred meter aperture spherical radio telescope is will use an active spherical reflector. When the zenith scan angle is changed, the illuminated part of the reflecting surface is made to fit a paraboloid of revolution in real time by active control. The maximum zenith scan angle | ψmax | of FAST is 30° under conditions of the geometry selected in order that the feed does not illuminate the ground. The result of this paper shows that the maximum zenith scan angle | ψmax | can be extended to 69° by offsetting the feed.

scholarly journals PAFINDER – Searching for FRBs and pulsars using Phased Array Feeds

2017 ◽  
Vol 13 (S337) ◽  
pp. 370-371
Author(s):  
Mateusz Malenta ◽  
Ewan Barr ◽  
Aaron Chippendale ◽  
Xinping Deng ◽  
Daniel George ◽  
...  
Keyword(s):  
Real Time ◽  
Radio Telescope ◽  
Phased Array ◽  
Single Pulse ◽  
Radio Bursts ◽  
Pulse Detection ◽  
Phased Array Feeds

AbstractThe challenges of detecting and localising Fast Radio Bursts in real time can be met with the use of Phased Array Feeds. One such system, capable of creating up to 36 simultaneous beams, is currently being commissioned at the Effelsberg radio telescope in Germany following testing at the 64 m Parkes radio telescope. The PAFINDER (Phased Array Feed FRB Finder) pipeline will be used with this receiver to enable real–time single–pulse detection and localisation.

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