Mr. Srinivasan Chandrasekharan Profile

Srinivasan Chandrasekharan

Senior Software Engineer

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Author

Publications (10)

Proceedings Article | 8 August 2016 Paper

LSST control software component design

Paul Lotz, Gregory Dubois-Felsmann, Kian-Tat Lim, Tony Johnson, Srinivasan Chandrasekharan, David Mills, Philip Daly, Germán Schumacher, Francisco Delgado, Steve Pietrowicz, Brian Selvy, Jacques Sebag, Stuart Marshall, Harini Sundararaman, Christopher Contaxis, Robert Bovill, Tim Jenness

Proceedings Volume 9913, 991309 (2016) https://doi.org/10.1117/12.2231796

KEYWORDS: Large Synoptic Survey Telescope, Control systems, Telecommunications, Telescopes, Sensors, Composites, Data acquisition, Motion controllers, Phase modulation, Calibration

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Proceedings Article | 8 August 2016 Paper

LSST active optics system software architecture

Sandrine Thomas, Srinivasan Chandrasekharan, Paul Lotz, Bo Xin, Charles Claver, George Angeli, Jacques Sebag, Gregory Dubois-Felsmann

Proceedings Volume 9906, 99063B (2016) https://doi.org/10.1117/12.2231798

KEYWORDS: Large Synoptic Survey Telescope, Telescopes, Wavefront sensors, Mirrors, Wavefronts, Active optics, Adaptive optics, Sensors, Cameras, Image sensors

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Proceedings Article | 4 August 2014 Paper

The LSST operations simulator

Francisco Delgado, Abhijit Saha, Srinivasan Chandrasekharan, Kem Cook, Catherine Petry, Stephen Ridgway

Proceedings Volume 9150, 915015 (2014) https://doi.org/10.1117/12.2056898

KEYWORDS: Telescopes, Device simulation, Large Synoptic Survey Telescope, Observatories, Databases, Computer simulations, Data modeling, Control systems, Prototyping, Astronomy

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The Operations Simulator for the Large Synoptic Survey Telescope (LSST; http://www.lsst.org) allows the planning of LSST observations that obey explicit science driven observing specifications, patterns, schema, and priorities, while optimizing against the constraints placed by design-specific opto-mechanical system performance of the telescope facility, site specific conditions as well as additional scheduled and unscheduled downtime. It has a detailed model to simulate the external conditions with real weather history data from the site, a fully parameterized kinematic model for the internal conditions of the telescope, camera and dome, and serves as a prototype for an automatic scheduler for the real time survey operations with LSST. The Simulator is a critical tool that has been key since very early in the project, to help validate the design parameters of the observatory against the science requirements and the goals from specific science programs. A simulation run records the characteristics of all observations (e.g., epoch, sky position, seeing, sky brightness) in a MySQL database, which can be queried for any desired purpose. Derivative information digests of the observing history are made with an analysis package called Simulation Survey Tools for Analysis and Reporting (SSTAR). Merit functions and metrics have been designed to examine how suitable a specific simulation run is for several different science applications. Software to efficiently compare the efficacy of different survey strategies for a wide variety of science applications using such a growing set of metrics is under development. A recent restructuring of the code allows us to a) use "look-ahead" strategies that avoid cadence sequences that cannot be completed due to observing constraints; and b) examine alternate optimization strategies, so that the most efficient scheduling algorithm(s) can be identified and used: even few-percent efficiency gains will create substantive scientific opportunity. The enhanced simulator is being used to assess the feasibility of desired observing cadences, study the impact of changing science program priorities and assist with performance margin investigations of the LSST system.

Proceedings Article | 4 August 2014 Paper

Real time wavefront control system for the Large Synoptic Survey Telescope (LSST)

George Angeli, Bo Xin, Charles Claver, Douglas MacMartin, Douglas Neill, Matthew Britton, Jacques Sebag, Srinivasan Chandrasekharan

Proceedings Volume 9150, 91500H (2014) https://doi.org/10.1117/12.2055390

KEYWORDS: Large Synoptic Survey Telescope, Wavefronts, Telescopes, Wavefront sensors, Cameras, Image quality, Control systems, Actuators, Atmospheric modeling, Mirrors

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Proceedings Article | 4 August 2014 Paper

An end-to-end simulation framework for the Large Synoptic Survey Telescope

Andrew Connolly, George Angeli, Srinivasan Chandrasekharan, Charles Claver, Kem Cook, Zeljko Ivezic, R. Lynne Jones, K. Simon Krughoff, En-Hsin Peng, John Peterson, Catherine Petry, Andrew Rasmussen, Stephen Ridgway, Abhijit Saha, Glenn Sembroski, Jacob vanderPlas, Peter Yoachim

Proceedings Volume 9150, 915014 (2014) https://doi.org/10.1117/12.2054953

KEYWORDS: Large Synoptic Survey Telescope, Device simulation, Stars, Galactic astronomy, Data modeling, Photons, Systems modeling, Solar system, Sensors, Atmospheric modeling

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Proceedings Article | 28 July 2014 Paper

The LSST metrics analysis framework (MAF)

R. Jones, Peter Yoachim, Srinivasan Chandrasekharan, Andrew Connolly, Kem Cook, Željko Ivezic, K. Krughoff, Catherine Petry, Stephen Ridgway

Proceedings Volume 9149, 91490B (2014) https://doi.org/10.1117/12.2056835

KEYWORDS: Large Synoptic Survey Telescope, Databases, Motion measurement, Device simulation, Computer simulations, Visualization, Telescopes, Stars, Motion analysis, Signal to noise ratio

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Proceedings Article | 27 September 2012 Paper

Prototype pipeline for LSST wavefront sensing and reconstruction

Charles Claver, Srinivasan Chandrasekharan, Ming Liang, Bo Xin, Enver Alagoz, Kirk Arndt, Ian Shipsey

Proceedings Volume 8444, 84444P (2012) https://doi.org/10.1117/12.926472

KEYWORDS: Wavefronts, Large Synoptic Survey Telescope, Wavefront sensors, Active optics, Adaptive optics, Image processing, Algorithm development, Prototyping, Sensors, Mirrors

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Proceedings Article | 17 September 2012 Paper

Active optics in Large Synoptic Survey Telescope

Ming Liang, Victor Krabbendam, Charles Claver, Srinivasan Chandrasekharan, Bo Xin

Proceedings Volume 8444, 84444Q (2012) https://doi.org/10.1117/12.926519

KEYWORDS: Large Synoptic Survey Telescope, Wavefronts, Device simulation, Zemax, Adaptive optics, Telescopes, MATLAB, Active optics, Mirrors, Sensors

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Proceedings Article | 13 September 2012 Paper

Measuring the effectiveness of simulated LSST observing programs

Stephen Ridgway, Srinivasan Chandrasekharan, Kem Cook, R. Lynne Jones, K. Simon Krughoff, Catherine Petry, Željko Ivezić

Proceedings Volume 8448, 844810 (2012) https://doi.org/10.1117/12.926306

KEYWORDS: Large Synoptic Survey Telescope, Computer simulations, Device simulation, Image quality, Telescopes, Asteroids, Space telescopes, Astronomy, Observatories, Distance measurement

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Proceedings Article | 30 July 2010 Paper

Simulation of autonomous observing with a ground-based telescope: the LSST experience

Stephen Ridgway, Kem Cook, Michelle Miller, Catherine Petry, Srinivasan Chandrasekharan, Abhijit Saha, Robyn Allsman, Timothy Axelrod, Charles Claver, Francisco Delgado, Zeljko Ivezic, R. Lynne Jones, Simon Krughoff, Francesco Pierfederici, Phillip Pinto

Proceedings Volume 7737, 77370Z (2010) https://doi.org/10.1117/12.857734

KEYWORDS: Large Synoptic Survey Telescope, Telescopes, Device simulation, Observatories, Data acquisition, Motion measurement, Astronomy, Optical instrument design, Cameras, Data modeling

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Showing 5 of 10 publications

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