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Real-time control using an open source RTOS

Real-time control using an open source RTOS

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conference on advanced telescope and instrumentation control software ii

作者： Irwin, PC Johnson, RL CALTECH Jet Prop Lab Pasadena CA USA

ISBN: (纸本)0819446270

Complex telescope systems such as interferometers tend to rely heavily on hard real-time operating systems (RTOS). It has been standard practice at NASA's Jet Propulsion Laboratory (JPL) and many other institutions to use costly commercial RTOSs and hardware. After developing a real-time toolkit for VxWorks on the PowerPC platform (dubbed RTC), the interferometry group at JPL is porting this code to the real-time Application Interface (RTAI), an open source RTOS that is essentially an extension to-the Linux kernel. This port has the potential to reduce software and hardware costs for future projects, while increasing the level of performance. The goals of this paper are to briefly describe the RTC toolkit, highlight the successes and pitfalls of porting the toolkit from VxWorks to Linux-RTAI, and to discuss future enhancements that will be implemented as a direct result of this port. The first port of any body of code is always the most difficult since it uncovers the OS-specific calls and forces "red flags" into those portions of the code. For this reason, It has also been a huge benefit that the project chose a generic, platform independent OS extension, ACE, and its CORBA counterpart, TAO. This port of RTC will pave the way for conversions to other environments, the most interesting of which is a non-real-time simulation environment, currently being considered by the Space Interferometry Mission (SIM) and the Terrestrial Planet Finder (TPF) Projects.

关键词： real-time real-time open source RTOS software RTAI Linux VxWorks RTC

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EMIR software: An overview

EMIR software: An overview

引用

advanced telescope and instrumentation control software ii

作者： López Ruiz, José C. Díz, J.J. Gago, Fernando Garzón, Francisco Patrón, Jesús Pelló, Roser Gallego, Jesús IAC 38200 La Laguna Tenerife Spain LAOMP Avenue Edouard Belin 14 31400 Toulouse France Universidad Complutense de Madrid Madrid Spain

EMIR (Espectródgrafo Multiobjeto Infrarrojo) is a wide-field, near-infrared, multi-object spectrograph, with image capabilities, which will be located at the Nasmyth focus of GTC (Gran Telescopic Canarias). It will allow observers to obtain many intermediate resolution spectra simultaneously, in the nIR bands Z, J, H, K. A multi-slit mask unit will be used for target acquisition. This paper shows an overview of the EMIR software. Its architecture is distributed with real time features, having in mind to build a reusable, maintainable and inexpensive system. In this paper, we outline the main performances of the current design and some examples already implemented are given.

关键词： Optical telescopes

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SOAR control systems operation: OCS & TCS

SOAR control systems operation: OCS & TCS

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advanced telescope and instrumentation control software ii

作者： Ashe, Michael Schumacher, Germán Sebring, Thomas SOAR Consortium Casilla 603 La Serena Chile

The SOAR telescope Project has developed a highly integrated telescope and Observatory control System, written in the LabVIEW graphical "G" language. A "plug-in" architecture and the ease of developing GUIs in LabVIEW has lead to a design and implementation that gives the operators flexibility, ease of use and a clear visual insight into the complex interactions of the many subsystems of a modern telescope. Care has been taken to abstract the many complexities into displays and controls that allows the operators to concentrate more on the functional operation of the telescope and observatory, and less on the intricacies of the various subsystems hardware. The User Interface includes many innovative features to make the operator's job easier. Our process methodology for developing the TCS/OCS and continuous peer review/revision are enabling us to exceed SOAR's requirements and create a TCS/OCS that can easily be applied to other telescopes.

关键词： Optical telescopes

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Remote use of the SOAR 4.25m telescope with LabVIEW

Remote use of the SOAR 4.25m telescope with LabVIEW

引用

conference on advanced Global Communications Technologies for Astronomy ii

作者： Cecil, G Crain, A Schumacher, G Univ N Carolina Dept Phys & Astron Chapel Hill NC USA

ISBN: (纸本)0819446246

The SOAR telescope will begin science operations in 2Q 2003. From the outset, astronomers at all U.S. research universities will be able to use it remotely, avoiding 24+ hrs of travel, and allowing half-nights to be scheduled to enhance scientific return. Most SOAR telescope systems, detector array controllers, and instruments will operate under LabVIEW control. LabVIEW enables efficient intercommunication between modules executing on dispersed computers, and is operating-system independent. We have developed LabVIEW modules for remote observing that minimize bandwidth to the shared LAN atop Cerro Pachon. These include control of a Polycom videoconferencing unit, export of instrument control GUI's and telescope telemetry to tactical displays, and a browser that first compresses an image in Chile by a factor of 256:1 from FITS to JPEG2000 and then sends it to the remote astronomer. Wherever the user settles the cursor, a region-of-interest window of lossless compressed data is downloaded for full fidelity. As an example of a dedicated facility, we show layout and hardware costs of the Remote Observing Center at UNC, where instruments on SOAR, SALT, and other telescopes available to UNC-CH astronomers will be operated.

关键词： remote observing LabVIEW image compression video conferencing

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Sloan digital sky survey photometric telescope automation and observing software

Sloan digital sky survey photometric telescope automation an...

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advanced telescope and instrumentation control software ii

作者： Neilsen, Eric H. Uomoto, Alan Kent, Stephen Annis, James Fermi Natl. Accelerator Laboratory Mail Stop 120 P. O. Box 500 Batavia IL 60510-5011 United States The Johns Hopkins University Baltimore MD United States

The photometric telescope (PT) provides observations necessary for the photometric calibration of the Sloan Digital Sky Survey (SDSS). Because the attention of the observing staff is occupied by the operation of the 2.5 meter telescope which takes the survey data proper, the PT must reliably take data with little supervision. In this paper we describe the PT's observing program, MOP, which automates most tasks necessary for observing. MOP's automated target selection is closely modeled on the actions a human observer might take, and is built upon a user interface that can be (and has been) used for manual operation. This results in an interface that makes it easy for an observer to track the activities of the automating procedures and intervene with minimum disturbance when necessary. MOP selects targets from the same list of standard star and calibration fields presented to the user, and chooses standard star fields covering ranges of airmass, color, and time necessary to monitor atmospheric extinction and produce a photometric solution. The software determines when additional standard star fields are unnecessary, and selects survey calibration fields according to availability and priority. Other automated features of MOP, such as maintaining the focus and keeping a night log, are also built around still functional manual interfaces, allowing the observer to be as active in observing as desired;MOP's automated features may be used as tools for manual observing, ignored entirely, or allowed to run the telescope with minimal supervision when taking routine data.

关键词： Optical telescopes

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Remote observing at the NASA Infrared telescope Facility

Remote observing at the NASA Infrared Telescope Facility

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conference on advanced Global Communications Technologies for Astronomy ii

作者： Bus, SJ Denault, AJ Rayner, JT Binzel, RP Birlan, M Univ Hawaii Inst Astron Hilo HI 96720 USA

ISBN: (纸本)0819446246

The NASA Infrared telescope Facility (IRTF) on Mauna Kea now offers observers the opportunity to carry out their observations remotely. They can choose to work from the mid-level station at Hale Pohaku, from a dedicated remote observing room at the Institute for Astronomy in Hilo, or from their home institution. As a test of our remote capabilities, observations have been successfully obtained by observers from an office at the Observatoire de Paris in Meudon, France. Their observing program utilized SpeX, the IRTF's low- to medium-resolution near-IR spectrograph and imager, to measure the 0.8-2.5 micron reflectance spectra of fast moving, near-Earth asteroids. All target acquisition, guiding, and instrument control was commanded from Meudon. We describe this observing campaign, and provide details about the techniques we have developed for remote observing.

关键词： remote observing

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Remote observing with the Keck telescopes from multiple sites in California

Remote observing with the Keck telescopes from multiple site...

引用

conference on advanced Global Communications Technologies for Astronomy ii

作者： Kibrick, R Hayes, B Allen, S Conrad, A Univ Calif Santa Cruz Univ Calif Observ Lick Observ Santa Cruz CA 95064 USA

ISBN: (纸本)0819446246

Remote observing is now the dominant mode of operation for both Keck telescopes and their associated instruments. Over 90% of all Keck observations axe carried out remotely from the Keck Headquarters in Waimea, Hawaii. The majority of Keck observers, however, are affiliated with research institutions located on the U.S. mainland, primarily in California. To observe with the Keck telescopes, most of these astronomers currently travel several thousand kilometers in order to sit in a Keck remote control room located tens of kilometers from the telescopes. Given recent improvements in network infrastructure and facilities, many of these observations can now be conducted directly from California. This report describes the operation of a Keck telescope remote observing facility located at the UCO/Lick Observatory headquarters on the Santa Cruz campus of the University of California (UCSC). This facility currently enables remote operation and engineering of Keck optical instruments via Internet-2. The facility was initially located in temporary quarters and became operational on a trial basis in September 2001. In June 2002, the facility moved to permanent quarters and became fully operational in July 2002. We examine in detail issues of Internet network bandwidth and reliability, and describe the design, routing implementation, and operation of an automated fall-back network utilizing dialed ISDN telephone circuits and routers. This report also briefly describes the status of efforts to establish Keck remote observing facilities at other California sites, and how the fall-back network design could be expanded to support multiple sites.

关键词： remote observing remote operation remote instrumentation video conferencing Internet-2 ISDN

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Structure synthesize and development for software radio

Structure synthesize and development for software radio

引用

conference on Asia-Pacific Optical and Wireless Communication (APOC 2002)

作者： Bai, FM Yu, FX Zhao, QD Yang, B Yu, QS Changchun Univ Sci & Technol Changchun Peoples R China

ISBN: (纸本)0819447005

Structure of the software radio system and basic theory are discussed and analyzed in this paper. Point out necessity of research the software radio and it's develop foreground, accentuate status of wireless system development, condition of software programmable technology and software develop. The paper introduced application diapason of the software radio and high-tech result of current headway in the international, such as the soft interface, the software BUS and the radio frequency synthesis and so on. To need develop tools and debugging work for software radios, the article given some recommendation. For the moment, also pay attention especially to exist some problems when research to the software radio. In the paper author take notice of application of communication and network;cordially put forward a series of suggestion and appreciation, too. The software radio is a system that it is used of the software to control, digit signal processing mode, to complete simulate wireless signal work state. So, work principle of the software radio and simulate mode. consult each other, further give prominence to software programming, it and simulate mode have a lot of difference. software radio using, it can meet information and culture all of requirement. It has obvious characteristics: It can be programmable completely. Used software to program realizes wireless a lot of advanced and complicated function that software work processes incarnate out full digital format. It is used of the network interface and to easy use program application to extend that work environment of more frequency paragraph and more systems, and encode unification. It has unification secrecy property;equipment upgrade and change type is easy, because it is software main, if change an applying the software, the equipment is renovated immediately.

关键词： software radio modularization programmable technology software BUS radio frequency synthesis

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Acquisition, tracking and pointing hardware architecture for the non-cooperative dynamic compensation experiment

Acquisition, tracking and pointing hardware architecture for...

引用

conference on Laser Weapons Technology ii

作者： Robertson, L Johnson, C Tipton, C Jordan, D Van Berg, C Cleaver, A Manning, W USAF Res Lab Directed Energy Directorate AFRL DEBA Kirtland AFB NM 87117 USA

ISBN: (纸本)081944071X

The Acquisition, Tracking and Pointing hardware and software for the Airborne Laser advanced Concept Testbed (ABL-ACT) Non-Cooperative Dynamic Compensation Experiment (NoDyCE) is described. Five main components make-up the entire ABL-ACT ATP system. These systems are: a 1-meter elevation over azimuth gimbal and gimbal control system with two acquisition sensors, a dome controller, a coarse track system, a fine track system, and a mode logic control system. Each subsystem's unique functionality, hardware choice and top level software architecture will be discussed. The optical, physical and information interfaces between each of the NoDyCE ATP systems is also described, as well as a brief discussion of the NoDyCE experiment goals and the overall NoDyCE architecture.

关键词： Cameras control systems Sensors telescopes Imaging systems Logic Mirrors Telecommunications Domes Video

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VLT software engineering and management

VLT software engineering and management

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conference on advanced telescope and instrumentation control software

作者： Raffi, G Filippi, G European So Observ Munich Germany

ISBN: (纸本)0819436348

The Very Large telescope (VLT) is an example of a geographically distributed collaboration. ESO, industrial contractors and Consortia of astronomical institutes have all contributed software to the same project. With one telescope in operation since a year and a second starting operation at the time of this presentation, while the third passed first light and the fourth is undergoing integration, we know now that the approach we took for the control software did work very well and can judge in retrospective about the various elements. This paper gives details about our experience with the development and installation of the VLT control software, considering standardization, iterative development, release concept, testing, configuration control, which were all elements of our approach. Thinking now to the completion of the VLT commissioning including interferometry (VLTI), to upgrades of the VLT control software and to future projects, we surely can gain a lot from the VLT experience and we will make good use of what we have learned.

关键词： VLT VLTI ESO software engineering management

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