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Magdalena Ridge Observatory Interferometer: The control system of the unit telescopes

Magdalena Ridge Observatory Interferometer: The control syst...

引用

2nd conference on advanced software and control for Astronomy

作者： Mayer, Chris Fisher, Marion Greer, Alan Parkhurst, James Taylor, Philip Observ Sci Ltd Cambridge CB4 0WX England

ISBN: (纸本)9780819472298

This paper describes the telescope control system for the Magdalena Ridge Observatory Interferometer. To achieve the rapid development time required by the project we made use of two software packages, LabVIEW from National Instruments and TCSpk from Tpoint software. The telescope control system is built from a set of components that conform to a standard interface and implement a set of component specific commands. Data is distributed throughout the system in a uniform manner by an event system that uses the publish-subscribe paradigm.

关键词： MROI telescope control System LabVIEW

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Acceleration feedback control on an AT

Acceleration feedback control on an AT

引用

conference on Ground-Based and Airborne instrumentation for Astronomy ii

作者： Sedghi, B. Bauvir, B. Dimmler, M. European So Observ D-8046 Garching Germany

ISBN: (纸本)9780819472229

The VLT observatory operated by ESO is located oil Cerro Paranal in Chile and consists of four identical 8-m telescopes and four 1.8-m VLTI Auxiliary telescopes (ATs). In order to further improve the tracking axes performance of telescopes regarding wind rejection, different control techniques have been evaluated. Ongoing investigation and studies show that by measuring the acceleration and using that in an appropriate control strategy the performance of telescope tracking in face of external perturbation can be improved. The acceleration signal contains the non filtered information (advanced phase compared to velocity and position) of the perturbation load, e.g. wind load. As a result the reaction of the control is faster and hence the perturbation rejection is more efficient. In this paper, two acceleration feedback techniques are discussed and the results of the, measurement test on all AT telescope are presented.

关键词： Acceleration feedback telescope axes control perturbation rejection wind buffeting

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The Study on Servo-control System in the Large Aperture telescope

The Study on Servo-Control System in the Large Aperture Tele...

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2nd conference on advanced software and control for Astronomy

作者： Hu, Wei Zhangi, Zhenchao Wang, Daxing Chinese Acad Sci Natl Astron Observ Nanjing Inst Astron Opt & Technol Nanjing 210042 Peoples R China

ISBN: (纸本)9780819472298

Large astronomical telescope or extremely enormous astronomical telescope servo tracking technique will be one of crucial technology that must be solved in researching and manufacturing. To control technique feature of large astronomical telescope or extremely enormous astronomical telescope, this paper design a sort of large astronomical telescope servo tracking control system. This system composes a principal and subordinate distributed control system, host computer sends steering instruction and receive slave computer functional mode, slave computer accomplish control algorithm and execute real-time control. Large astronomical telescope servo control use direct drive machine, and adopt DSP technology to complete direct torque control algorithm, Such design can not only increase control system performance, but also greatly reduced volume and costs of control system, which has a significant occurrence. The system design scheme can be proved reasonably by calculating and simulating. This system can be applied to large astronomical telescope.

关键词： Large Aperture telescope Digital Signal Processor (DSP) Module Direct Torque control(DTC) Permanent Magnet Synchronous Machine(PMSM) Intelligent Power Modules (IPM)

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Implementation of advanced Modified PCF in Large telescope control System

Implementation of Advanced Modified PCF in Large Telescope C...

引用

2nd conference on advanced software and control for Astronomy

作者： Shuai Xiaoying Zhang Zhenchao Zhu Yongtian National Astronomical Observatories Nanjing Institute of Astronomical Optics & Technology (China) Graduate School of the Chinese Academy of Sciences (China)

ISBN: (纸本)9780819472298

Large telescope control System (TCS) is a complicated system, which contains thousands of actuators. Wired TCS is inconvenient to point and track for a large telescope. This paper proposes a TCS based on IEEE 802.11 Wireless Local Area Network (WLAN), which provides flexibility, reduced infrastructure costs, and greater convenience. The IEEE 802.11 standard MAC protocol includes the DCF and the PCF. The DCF is designed for asynchronous data transmission, while the PCF is designed for real-time data. The performance of a WLAN with DCF will fall when the number of wireless station increase in a basic service set (BSS). An advanced modified PCF (APCF) is presented to poll data from the AP to stations and response data from stations to the AP in CFP. The analysis indicates that APCF can improve communication performance, and is very suitable for large TCS.

关键词： PCF telescope control System WLAN APCF TCS

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PCR - A PC based wave front reconstructor for MMT-AO

PCR - A PC based wave front reconstructor for MMT-AO

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2nd conference on advanced software and control for Astronomy

作者： Vaitheeswaran, Vidhya Hinz, Phil Brusa, Guido Miller, Doug Stalcup, Thomas Univ Arizona Steward Observ 933 N Cherry Ave Tucson AZ 85721 USA Large Binocular Telescope Tucson AZ 85721 USA Multiple Mirror Telescope Tucson AZ 85721 USA

ISBN: (纸本)9780819472298

PC Reconstructor (PCR) is the control software for the natural guide star and the laser guide star systems at the 6.5m Multiple Mirror telescope (MMT) operating with the adaptive secondary mirror on Mt. Hopkins south of Tucson, AZ. The PCR computes and corrects atmospheric turbulence featuring a common interface between the wave front sensor camera control link and the deformable mirror, diagnostic data management, vibration control, closed-loop data distribution & saving routines, and housekeeping modules. We report here on the development, use and the on-sky performance of the PCR.

关键词： Adaptive Optics Deformable Mirror and software

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Thirty Meter telescope: observatory software requirements, architecture, and preliminary implementation strategies

Thirty Meter Telescope: observatory software requirements, a...

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2nd conference on advanced software and control for Astronomy

作者： Silva, David R. Angeli, George Boyer, Corinne Sirota, Mark Trinh, Thang AURA Thirty Meter Telescope 2632 East Washington Blvd Pasadena CA 91107 USA Thirty Meter Telescope Pasadena CA 91107 USA JPL Thirty Meter Telescope Pasadena CA 91107 USA

ISBN: (纸本)9780819472298

The Thirty Meter telescope (TMT) will be a ground-based, 30-m optical-IR alt-az telescope with a highly segmented primary mirror located in a remote location. Efficient science operations require the asynchronous coordination of many different sub-systems including telescope mount, three independent active optics sub-systems, adaptive optics, laser guide stars, and user-configured science instrument. An important high-level requirement is target acquisition and observatory system configuration must be completed in less than 5 minutes (or 10 minutes if moving to a new instrument). To meet this coordination challenge and target acquisition time requirement, a distributed software architecture is envisioned consisting of software components linked by a service-based software communications backbone. A master sequencer coordinates the activities of mid-layer sequencers for the telescope, adaptive optics, and selected instrument. In turn, these mid-layer sequencers coordinate the activities of groups of sub-systems. In this paper, TMT observatory requirements are presented in more detail, followed by a description of the design reference software architecture and a discussion of preliminary implementation strategies.

关键词： Extremely Large telescope observatory operations observatory software

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Research and Implementation of Large telescope control System Based on Wireless Smart Sensors

Research and Implementation of Large Telescope Control Syste...

引用

2nd conference on advanced software and control for Astronomy

作者： Shuai Xiaoying Zhang Zhenchao Ren Changzhi Zhu Yongtian National Astronomical Observatories Nanjing Institute of Astronomical Optics and Technology Chinese Academy of Sciences Nanjing 210042 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

ISBN: (纸本)9780819472298

telescope control System (TCS) becomes more and more complexity, especially the large telescope control system of force actuators for deformed mirror and position actuators for modifiable degrees of mirrors. It is very difficulty to connect thousands of sensors, actuators and controller with wired link. This paper presented a large telescope control system based on wireless smart sensor (WLTCS), connecting wireless sensors and controllers with wireless link, employing the TCP/IP protocol as communication protocol. Polling access can overcome contention and guarantee every sensor to communicate with controller in time;using intelligent control methods when some channels are interfered, multi-hop wireless paths can improve throughput and performance. The analysis and simulation indicate that WLTCS can greatly reduce complex of implementation and improve communication performance.

关键词： telescope control System TCS WLTCS wireless smart sensors

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VST telescope primary mirror active optics actuators firmware implementation

VST telescope primary mirror active optics actuators firmwar...

引用

2nd conference on advanced software and control for Astronomy

作者： Molfese, C. Schipani, P. Marty, L. INAF VSTceN Naples Italy INAF OAC Naples Italy

ISBN: (纸本)9780819472298

The VST (VLT Survey telescope) is a 2.6 m class Alt-Az telescope in installation phase at Cerro Paranal in Northern Chile, at the European Southern Observatory (ESO) site. The VST is a wide-field imaging telescope dedicated to supply databases for the ESO Very Large telescope (VLT) science and to carry out stand-alone observations in the Ultraviolet to Infrared spectral range. The VST is provided with an active optics control system to actively compensate the optical aberrations;it is based oil 84 actuators controlling the shape of the primary mirror and a hexapode for secondary mirror positioning. The present paper focuses on the implementation of the microcontroller programming firmware for the Primary Mirror Actuators Electronic control Board. The most relevant problems encountered during the implementation of this real time multitasking distributed control application are described;optimization problems due to low performing hardware platform, not provided with operating system, are also reported. Several described topics are applicable to other distributed control systems, requiring closed loop control system and communication capability with a higher level computer.

关键词： Active Optics Distributed control System Embedded control CAN Bus VST telescope

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Evaluation of thermal control coatings exposed to ambient weather conditions at Haleakala High Altitude Observatory

Evaluation of thermal control coatings exposed to ambient we...

引用

conference on Ground-Based and Airborne instrumentation for Astronomy ii

作者： Phelps, L. Natl Solar Observ Tucson AZ 85719 USA

ISBN: (纸本)9780819472229

The derived heat loads from thermal models are used to size the equipment that controls exterior enclosure seeing for the advanced Technology Solar telescope. These loads are highly dependent on the radiative properties assumed for the surface coatings of the enclosure. The properties of traditional white coatings and paints are known to degrade with time as they are exposed to the elements, but not by how much or how quickly. The solar reflectance and thermal emissivity of coatings considered for use on the enclosure, in a weathered condition, are not readily available from coatings manufacturers or in the scientific literature. The results from a one-year test of nine different coatings that were weathered at the summit of Haleakala on the island of Maui, Hawaii are reported and discussed.

关键词： ATST telescope Enclosure thermal coatings

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VST primary mirror active optics electronics

VST primary mirror active optics electronics

引用

2nd conference on advanced software and control for Astronomy

作者： Molfese, C. Schipani, P. Capaccioli, M. Sedmak, G. D'Orsi, S. INAF VSTceN Naples Italy INAF OAC Naples Italy Univ Federico II Naples Italy Univ Trieste Trieste Italy

ISBN: (纸本)9780819472298

The VLT Survey telescope (VST), a telescope with a 2.6 m. primary mirror designed and implemented by I.N.A.F. in cooperation with the European Southern Observatory (ESO), is provided with an active optics system to correct the optical aberrations due to polishing imperfections, misalignments, thermal and gravity reasons. For the primary mirror, a distributed control system is required to impose the desired force values in a sufficient number of points to maintain the optimal shape in different positions of the altitude axis. The forces are applied by means of 84 electro-mechanical actuators, provided with an electronic Primary Mirror Actuator control Boards (M1ACB). This paper focuses mainly on the hardware electronics and is referred to the control system new version, designed in 2007, whose implementation is in progress. The new design has taken into account all the experience done on the system previous version, solving all the encountered problems of functionality and reliability.

关键词： Active Optics Distributed control Embedded control CAN Bus VST Survey telescope

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