scispace - formally typeset
Search or ask a question

Showing papers on "Testbed published in 1993"


Journal ArticleDOI
TL;DR: In this paper, a packet-switched high-capacity all-optical LAN/MAN network based on wavelength division multiplexing (WDM) and capable of supporting several hundred to a thousand nodes, each requiring gigabit-per-second throughputs is described.
Abstract: A proposal for developing a precompetitive, commercially viable all-optical network architecture using dense optical wavelength division is described. The objective was to demonstrate a packet-switched high-capacity all-optical LAN/MAN network based on wavelength-division multiplexing (WDM) and capable of supporting several hundred to a thousand nodes, each requiring gigabit-per-second throughputs. The discussion covers the rationale and objectives of the program; tunable components, optical amplifiers, network protocol, and application development; network interconnection studies; and testbed construction. >

90 citations


Journal ArticleDOI
TL;DR: An overview of the goals and methodologies employed in AURORA are provided, and some preliminary results from the first year of research are pointed to, ranging from analytic results to experimental prototype hardware.
Abstract: AURORA is one of five U.S. networking testbeds charged with exploring applications of, and technologies necessary for, networks operating at gigabit per second or higher bandwidths. The emphasis of the AURORA testbed, distinct from the other four testbeds, BLANCA, CASA, NECTAR and VISTANET, is research into the supporting technologies for gigabit networking. Like the other testbeds, AURORA itself is an experiment in collaboration, where government initiative (in the form of the Corporation for National Research Initiatives, which is funded by DARPA and the National Science Foundation) has spurred interaction among pre-existing centers of excellence in industry, academia, and government. AURORA has been charged with research into networking technologies that will underpin future high-speed networks. This paper provides an overview of the goals and methodologies employed in AURORA, and points to some preliminary results from our first year of research, ranging from analytic results to experimental prototype hardware. This paper enunciates our targets, which include new software architectures, network abstractions, and hardware technologies, as well as applications for our work.

58 citations


Proceedings ArticleDOI
29 Nov 1993
TL;DR: The paper describes the design and implementation of the service logic execution environment platform of GTE's intelligent network (IN) testbed and discusses the server architecture which realizes that abstraction.
Abstract: The paper describes the design and implementation of the service logic execution environment platform of GTE's intelligent network (IN) testbed. The platform is a layer of software built on top of computer operating systems. Based on the primitive services provided by the underlying operating systems, the platform provides higher-level services to service logic programs (SLPs). SLPs, applications of the platform, provide the logic that implements IN services. The paper presents an overview of the abstraction and services presented to SLPs, and then discusses the server architecture which realizes that abstraction. >

42 citations


Proceedings ArticleDOI
18 Sep 1993
TL;DR: The Robotic Systems Technology Branch at the NASA/Johnson Space Center has completed a baseline ground control testbed for use in developing and evaluating technology for Space Station Freedom (SSF) Robotic Tasks.
Abstract: The Robotic Systems Technology Branch at the NASA/Johnson Space Center has completed a baseline ground control testbed for use in developing and evaluating technology for Space Station Freedom (SSF) Robotic Tasks. The focus of the first phase of this work has been addressing the effects of significant ground-to-orbit time delays on operations. This testbed uses a predictive display to enable virtual realtime control of a remote robot. The operator commands a graphical kinematic manipulator through hand controllers or automated sequences which, in turn, drive the actual manipulator after a user-defined delay. The predictive display provides artificial camera views that enable the operator to measure clearances not available in actual camera views. A delayed camera control interface, and a robot verification display are also available. All testbed components are connected in a distributed processing environment. The ground control testbed architecture and technology utilized to address the time delays are described. >

39 citations


Journal ArticleDOI
01 Jul 1993
TL;DR: The ATOMIC project at USC/ISI is using Mosaic nodes to prototype a gigabit LAN testbed, and the results reported in this paper represent actual data obtained from the prototype.
Abstract: The typical node of a message-based multicomputer consists of a microprocessor, router and memory. At the California Institute of Technology, the Mosaic project has integrated such a node onto a single chip. That reduction in scale fundamentally changes the scope of node application, since nodes become both very small, and inexpensive.Mosaic nodes may be employed to process, to generate, or to receive data. Since the router in a Mosaic node is independent of the microprocessor, computation and routing take place simultaneously. These nodes may be used to create general purpose gigabit LANs. They may also be used to create special purpose gigabit networks to interconnect instrumentation within spacecraft or aircraft.The ATOMIC project at USC/ISI is using Mosaic nodes to prototype a gigabit LAN testbed. This testbed is operational. Networking and administration software provides full TCP/IP compatibility. Packets have been exchanged between two interfaces at a rate above one gigabit per second (Gb/s).An individual ATOMIC interface is both inexpensive and small, consisting of one Mosaic chip, four SRAM chips and clock logic. Two interfaces easily fit onto a postcard-sized circuit board. Their low cost makes it practical to include several interfaces within a host, providing an interior Gb/s distribution network, multiple access points to the LAN for greater performance or redundancy, and other capabilities that are not yet fully explored. The results reported in this paper represent actual data obtained from the prototype.

36 citations


Proceedings ArticleDOI
18 May 1993
TL;DR: The goal of the Walkstation project is to realize a user transparent mobile IP router (MINT) for wireless links (infrared and radio) operating at 1-10 Mbit/sec.
Abstract: Today, mobility of portable computers and workstations is not transparent to users. They adjust to reduced services as long as they have no connection to a supporting infrastructure. The goal of the Walkstation project is to realize a user transparent mobile IP router (MINT) for wireless links (infrared and radio) operating at 1-10 Mbit/sec. For the study of user behavior and system characteristics a campus wide testbed (ERIC) with 50-100 stations is planned to demonstrate the new solutions found in the Walkstation II project. >

33 citations


Journal ArticleDOI
TL;DR: The concept behind Zeus, an asynchronous transfer mode (ATM) network implemented on the campus of Washington University, is discussed and the switch architecture, network control software, application interfaces, and internetworking developed in the first phase are described.
Abstract: The concept behind Zeus, an asynchronous transfer mode (ATM) network implemented on the campus of Washington University, is discussed. The first phase of the project, which demonstrated the feasibility of the core technology, provided a basis for a more complete design, and served as a testbed for application development, is reviewed. The switch architecture, network control software, application interfaces, and internetworking developed in the first phase are described. >

32 citations


Journal ArticleDOI
A. Chai1, S. Ghosh1
TL;DR: A distributed approach to communication network simulation using a network of workstations configured as a loosely coupled parallel processor to model and simulate the broadband integrated services digital network (B-ISDN) is proposed.
Abstract: A distributed approach to communication network simulation using a network of workstations configured as a loosely coupled parallel processor to model and simulate the broadband integrated services digital network (B-ISDN) is proposed. In a loosely coupled parallel processor system, a number of concurrently executable processors communicate asynchronously using explicit messages over high-speed links. Since this architecture is similar to that of B-ISDN networks, it constitutes a realistic testbed for their modeling and simulation. The authors describe an implementation of this approach on 50 Sun workstations at Brown University. Performance results, based on representative B-ISDN networks and realistic traffic models, indicate that the distributed approach is efficient and accurate. >

31 citations


Proceedings ArticleDOI
12 Oct 1993
TL;DR: The Code Division Testbed (CODIT) project is a research project within the European RACE programme that has the objective to explore the potential of CDMA for a future third generation mobile system like FPLMTS or UMTS.
Abstract: The basic requirement on a third generation mobile system is to support universal high quality voice service as well as a wide range of data services, including data file transfer and high bit-rate services. The Code Division Testbed (CODIT) project is a research project within the European RACE programme that has the objective to explore the potential of CDMA for a future third generation mobile system like FPLMTS or UMTS. The main activities of the project are: To establish an advanced system concept based on CDMA including advanced radio technologies (radio interface, radio transceivers, etc.) and advanced radio subsystem architecture (micro and picocells, macro diversity, fast and soft handover, frequency management, radio network planning, etc.). To design and build a system demonstrator (testbed) comprising test mobile stations, radio base stations and a radio network controller. To validate the system concept in laboratory and field test, as well as with simulations. The results will be used to improve the concept and to compare with other radio access techniques. The project duration was from February 1992 to December 1994. During 1992 the basis for the system concept was established. The design and manufacture of the testbed were to take place during 1993 and lab and field tests to be performed 1994.

30 citations


Journal ArticleDOI
TL;DR: A high-autonomy intelligent command and control architecture developed for unmanned plants that can conduct scientific experiments or process local planetary resources is described and a working prototype of a plant for producing oxygen from the Martian atmosphere is discussed.
Abstract: A high-autonomy intelligent command and control architecture developed for unmanned plants that can conduct scientific experiments or process local planetary resources is described. Two applications are discussed: a biotechnology laboratory designed for Space Station Freedom and a working prototype of a plant for producing oxygen from the Martian atmosphere. A distributed command and control architecture designed to teleoperate such plants in a high-level task-oriented mode with supervisory control from one or several remote sites is also described. The architecture integrates advanced network communication concepts and modern man/machine interfaces with recent advances in autonomous intelligent control. A complete testbed has been developed to demonstrate several applications of the architecture. >

26 citations


Proceedings ArticleDOI
26 Jan 1993
TL;DR: A software testbed that performs automated life testing of a variety of multiprocessor architectures through simulated fault injection is discussed, and REACT can be more accurate and easier to use than many dependability prediction tools based on analytical approaches.
Abstract: A software testbed that performs automated life testing of a variety of multiprocessor architectures through simulated fault injection is discussed. It is being developed to meet the need for a generalized simulation tool which can evaluate system reliability and availability metrics while avoiding several of the limitations associated with combinatorial and Markov modeling. Incorporating detailed system, workload, and fault/error models, REACT can be more accurate and easier to use than many dependability prediction tools based on analytical approaches. The authors motivate the development of REACT, describe its features, and explain its use. Example applications for the software are provided, and its limitations are discussed. >

Proceedings ArticleDOI
02 Jun 1993
TL;DR: Significant non-linearities, such as discrete position sensing capabilities, are designed into the experiemtnal ball and beam apparatus in order to compare control effectiveness when transfering control designs from simulation to a real world testbed.
Abstract: This paper describes a case study from conception through final experimental design of a ball and beam testbed for comparison of conventional and fuzzy control techniques Control objectives include quick and accurate positioning of the ball to a specified location along the platform Conventional linear control techniques were employed in simulation and then applied to the experimental apparatus For comparison purposes, techniques in fuzzy control were utilized in developing alternative control algorithms Significant non-linearities, such as discrete position sensing capabilities, are designed into the experiemtnal ball and beam apparatus in order to compare control effectiveness when transfering control designs from simulation to a real world testbed

ReportDOI
01 Dec 1993
TL;DR: An overview of the MAGIC project is provided, which is developing a high-speed, wide-area networking testbed that will demonstrate a real-time terrain visualization application using interactive exchange of data at gigabit-per-second rates among multiple distributed servers and clients.
Abstract: : This note provides an overview of the MAGIC project, which is developing a high-speed, wide-area networking testbed that will demonstrate a real-time terrain visualization application using interactive exchange of data at gigabit-per-second rates among multiple distributed servers and clients. Wide-area networking, Testbed, Servers.

Proceedings ArticleDOI
TL;DR: The primary objective of the testbed is to perform a system integration of Control Structure Interaction technologies necessary to demonstrate the end-to-end operation of a space- based interferometer, ultimately proving to flight mission planners that the necessary control technology exists to meet the challenging requirements of future space-based interferometry missions.
Abstract: This paper describes the overall design and planned phased delivery of the ground-based Micro-Precision Interferometer (MPI) Testbed. The testbed is a half scale replica of a future space-based interferometer containing all the spacecraft subsystems necessary to perform an astrometric measurement. Appropriate sized reaction wheels will regulate the testbed attitude as well as provide a flight-like disturbance source. The optical system will consist of two complete Michelson interferometers. Successful interferometric measurements require controlling the positional stabilities of these optical elements to the nanometer level. The primary objective of the testbed is to perform a system integration of Control Structure Interaction (CSI) technologies necessary to demonstrate the end-to-end operation of a space- based interferometer, ultimately proving to flight mission planners that the necessary control technology exists to meet the challenging requirements of future space-based interferometry missions. These technologies form a multi-layered vibration attenuation architecture to achieve the necessary quiet environment. This three layered methodology blends disturbance isolation, structural quieting and active optical control techniques. The paper describes all the testbed subsystems in this end-to-end ground-based system as well as the present capabilities of the evolving testbed.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Proceedings ArticleDOI
TL;DR: The hardware provides new capability in background light rejection by using innovative atomic line filter technology, improved tracking accuracy by use of innovative zero backlash Roto-Lok drive gimbal telescopes, and increased communications bandwidth by incorporating multi-link networking protocols.
Abstract: Laser satellite networking is a key element of effective communications operations to support both strategic and tactical missions. Lasercom offers a number of important advantages over conventional RF satellite communications. The shorter wavelength available using lasers provides higher data rates at less power and smaller apertures, both resulting in lower weight requirements. On the other hand, lasercom entails more difficulty in acquisition and tracking because of the narrow beams used. Technology problems to be overcome before intersatellite laser communications can reliably outperform RF communications include acquisition in the presence of significant background light from the earth, tracking to resolutions of a few microradians, high speed modulation of semiconductor lasers with close to one watt of power in a diffraction limited beam, high bandwidth low noise detector response, and demonstrated long term performance. We have developed critical technologies to solve some of these problems, and demonstrated them in a laboratory testbed which also supports development and testing of network protocols and algorithms. Our hardware provides new capability in background light rejection by using innovative atomic line filter technology, improved tracking accuracy by using innovative zero backlash Roto-Lok drive gimbal telescopes, and increased communications bandwidth by incorporating multi-link networking protocols.

Proceedings ArticleDOI
18 Sep 1993
TL;DR: A network management system is being designed that uses a virtual world presented through a 3-D stereo display and manipulated with a3-D mouse to allow the user to better understand and control the structure and behavior of a large, complex network.
Abstract: Existing network management systems typically use a combination of textual displays and 2-D directed graph representations of network topology. A network management system is being designed that uses a virtual world presented through a 3-D stereo display and manipulated with a 3-D mouse. The goal is to allow the user to better understand and control the structure and behavior of a large, complex network. In the current prototype, the user interacts with a 3-D representation of a network whose topology and behavior are specified by a separate network emulator. The user can choose from among a set of different views of the network. For example, one view shows a selected virtual path as a series of logical links contained within a physical path. The system will serve as a testbed for the knowledge-based design of network visualizations. >

Proceedings ArticleDOI
01 Nov 1993
TL;DR: A multiplatform distributed fusion architecture under development to provide enhanced cueing and sensor resource management is discussed, and the current status of ongoing testbed development activities are shown to provide insight into the proposed architecture.
Abstract: The development of a multiple platform distributed fusion capability offers the potential for effective data interchange linking multiple surveillance platforms and centers. Initial off-board derived data can provide the appropriate cues for sector prioritization and sensor resource management. The efficient correlation and fusion of surveillance data from multiple sources with sensors directly on the platform will provide increased situation awareness. This paper discusses a multiplatform distributed fusion architecture under development to provide enhanced cueing and sensor resource management. It shows the current status of ongoing testbed development activities that can be used to provide insight into the proposed architecture. An example is provided to correlate this research to the drug interdiction problem. >

Proceedings ArticleDOI
TL;DR: A control application model and a dis- tributed computer testbed, developed for the purpose of distributed real-time control of machinery, and the impor- tance of considering the real- time cooperation constraints of control components within a control application is emphasized.
Abstract: This paper describes a control application model and a dis- tributed computer testbed, developed for the purpose of stu- dying distributed real-time control of machinery. Different control approaches are considered depending on the support provided by the distributed computer system. The impor- tance of considering the real-time cooperation constraints of control components, within a control application, is emphasized and communication subsystem properties needed to fupll them are proposed.

Proceedings ArticleDOI
18 Sep 1993
TL;DR: A research testbed developed to investigate the use of virtual environment (VE) technology for army training is described, in which performance data is collected as participants complete a variety of basic tasks.
Abstract: A research testbed developed to investigate the use of virtual environment (VE) technology for army training is described. The objectives of the testbed and the first experiments conducted using the testbed are described, in which performance data is collected as participants complete a variety of basic tasks: vision (acuity, color vision, distance estimation, and search); location (walking and flying through structures); tracking and object manipulation (placing and keeping a cursor on an object, and using it to move objects); and reaction time. >

Proceedings ArticleDOI
23 May 1993
TL;DR: ETHMICS is a testbed to investigate various aspects of multimedia communication in a high-speed networked environment, with a view to realistic application experiments, a multimedia workstation has been developed, yielding new insights about workstation architecture and local access arrangements.
Abstract: ETHMICS is a testbed to investigate various aspects of multimedia communication in a high-speed networked environment. With a view to realistic application experiments, a multimedia workstation has been developed, yielding new insights about workstation architecture and local access arrangements. In terms of software, ETHMICS is based on an object-oriented application framework. This framework has a videophone application as one of its first derivatives. Hardware and software developments have been complemented by some fundamental studies on the impact of multimedia quality of service (QOS) requirements on the strategies for scheduling workstation and network resources. >

Proceedings ArticleDOI
09 Feb 1993-Fibers
TL;DR: Two pre-allocation protocols are introduced that are targeted to the spectral sliced architecture and the resulting performance of the two protocols is examined in terms of average delay and throughput through discrete event simulation.
Abstract: This paper briefly describes the spectral sliced testbed. The architecture pre-allocates channels for data reception and results in a system with M nodes and C subsystem at each node, since only a single wavelength channel is delivered to each node. In addition to the low complexity, the proposed spectral sliced approach supports multicast and broadcast modes in which one processor can simultaneously transfer data to more than one destination. Protocol complexity is the major constraint in this environment. The protocols must have both low implementational and operational complexity to maintain practical feasibility at the high operating speeds. Pre-allocation approaches appear to be very promising because of their low implementation and operational complexity. Two pre-allocation protocols are introduced that are targeted to the spectral sliced architecture. The resulting performance of the two protocols is examined in terms of average delay and throughput through discrete event simulation.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Proceedings ArticleDOI
29 Nov 1993
TL;DR: The authors provide an update on the intelligent network (IN) testbed under development by GTE, discuss their experiences in prototyping INs, and present some plans for the testbed.
Abstract: The authors provide an update on the intelligent network (IN) testbed under development by GTE, discuss their experiences in prototyping INs, and present some plans for the testbed. The testbed includes prototypes of AIN switch capabilities (on a GTD-5/sup 1/ EAX switching system), service logic execution environment, service creation environment, intelligent peripheral, and m-specific operations support systems. The testbed, originally based on the advanced intelligent network (AIN) release 1 architecture, as proposed by Bellcore, has evolved with the industry and is maintaining compatibility with AIN releases 0.1 and 0.2. Nonetheless, as the call model implemented in the first phase of testbed development represented a substantial subset of the AM release 1 call model, the testbed provides richer functionality, particularly for mid-call services, than other flavors of INs under consideration by the industry. >

Proceedings Article
02 May 1993
TL;DR: This document presents the Illinois Pulsar{based Optical INTerconnect (iPOINT) testbed, a collaborative research project between the Microelectronics Center and the Computer Science Department at the University of Illinois investigating the use of Optical Electronic Integrated Circuits (OEICs) for high-bandwidth computer networking.
Abstract: This document presents the Illinois Pulsar{based Optical INTerconnect (iPOINT) testbed, a collaborative research e ort between the Microelectronics Center and the Computer Science Department at the University of Illinois investigating the use of Optical Electronic Integrated Circuits (OEICs) for high{bandwidth computer networking. Optoelectronic components are the enabling technology for multigigabit networks. This document discusses the system requirements and the device speci cations of the individual optical and electronic components of these networks. The packet switching technology required for computer network and variable bit rate tra c patterns is investigated. Architectures are discussed for multigigabit packet switches. The iPOINT Asynchronous Transfer Mode (ATM) hardware prototype packet switch is presented. The network software and protocols needed to e ciently transport messages between the workstation's internal memory and the high{bandwidth ber interface are examined. The iPOINT user{space network software and kernel{space device driver that were developed to provide simultaneous audio, image, and le transfers among Sun SPARCstation 10's using ATM cells are introduced. Memory{to{ ber bandwidth benchmark data are presented. Suggestions for future optoelectronic device research and the topics of investigation for the next phase of the iPOINT testbed are given in Chapter 5. iii ACKNOWLEDGEMENTS I would like to thank Professors S. M. Kang and S. G. Bishop for their support and guidance throughout the iPOINT project. I would like to thank Professor R. H. Campbell who made the Xunet interaction at this university possible. I would like to acknowledge Chao Cheong for his work in programming the user{space application programs. Noted also is Haoran Duan for his work on the queue module. I would like to thank Ben Cox, an undergraduate CCSM intern, for his work in the development of the STREAMS device driver and gathering the performance data of the Fore device. Finally, thanks are due to Ben Sander, an undergraduate, for his work on the FPGA Pulsar switch. iv TABLE OF CONTENTS CHAPTER PAGE

Proceedings ArticleDOI
26 Jan 1993
TL;DR: The authors describe a software tool called REST (Reliability Estimation System Testbed) that provides increased power of expression and computation that is innovative in its use of an object-oriented language to describe systems.
Abstract: The authors describe a software tool called REST (Reliability Estimation System Testbed) that provides increased power of expression and computation. REST is innovative in its use of an object-oriented language to describe systems, in its avoidance of a memory bottleneck during the analysis, and in its automatic exploitation of parallelism both on a commercial multiprocessor and on a network of ordinary workstations. The potential of the Failure Mode Effects Simulation paradigm on which REST is based is shown by rapid analysis on a parallel computer of a complex reconfigurable system. >

Proceedings ArticleDOI
19 Jul 1993
TL;DR: This paper describes an experimental prototype of a HIPPUATWSONET (HAS) network interface for the Nectar Gigabit Testbed, which connects High Performance Parallel Interface local area networks at Camegie-Mellon University and the Pittsburgh Supercomputing Center using a high-speed Synchronous Optical Network/Asynchronous Transfer Mode network.
Abstract: This paper describes an experimental prototype of a HIPPUATWSONET (HAS) network interface for the Nectar Gigabit Testbed.The HAS connects High Performance Parallel Interface (HIPPI) local area networks at Camegie-Mellon University (CMU) and the Pittsburgh Supercomputing Center (PSC) using a high-speed Synchronous Optical Network/Asynchronous Transfer Mode (SONET/ ATM) network as shown in Figure 1. [ 11

Proceedings ArticleDOI
29 Nov 1993
TL;DR: The design and functionality of the prototype service management system (SMS) developed for phase 1 of the GTE intelligent network (IN) testbed is described, providing a flow through process, fully automating the provisioning process from customer contact to service activation, with automatic error recovery capabilities.
Abstract: The key to the successful operation of INs is the existence of adequate operations support systems allowing for rapid deployment of new services, making them available to customers and allowing for their rapid customization and modification. The paper describes the design and functionality of the prototype service management system (SMS) developed for phase 1 of the GTE intelligent network (IN) testbed. Phase I SMS prototypes full service negotiation and management and memory administration. It provides a flow through process, fully automating the provisioning process from customer contact to service activation, with automatic error recovery capabilities. The SMS supports a flexible distributed architecture. >


Proceedings ArticleDOI
29 Nov 1993
TL;DR: The MINT terminal is described, an experimental broadband ATM-based multimedia teleconferencing terminal intended for use as a research testbed in exploring some of the challenges and issues associated with future networks and applications.
Abstract: We describe the MINT terminal, an experimental broadband ATM-based multimedia teleconferencing terminal, intended for use as a research testbed in exploring some of the challenges and issues associated with future networks and applications. The MINT terminal features an open, modular architecture which caters to our research requirements of easy upgradability (addition of new media application "clients"), flexibility (adaptable to a wide variety of broadband networking experiments), and relative independence from fluctuations in the emerging ATM standards. Our initial set of basic media clients includes a real-time NTSC video client, an Ethernet/IP (Internet Protocol) gateway/router client, and (coming soon) a high-quality echo-cancelling speakerphone audio client. We discuss some of the issues, features, and human factors aspects of the terminal design, as well as the terminal architecture and our results to date. >

Proceedings ArticleDOI
TL;DR: This paper focuses primarily on the optical design for the testbed and the systems-level tradeoffs between the optics and other systems due to the fact that the interferometer is on a large, lightly damped, flexible structure rather than on the ground.
Abstract: The Micro-Precision Interferometer Testbed is essentially a space-based Michelson interferometer suspended in a ground-based laboratory. The purpose of the testbed is to serve as a proving ground for technologies needed for future space-based missions requiring low- vibration environments. A layered control architecture, utilizing isolation, structural control, and active optical control technologies, allows the system to achieve its vibration attenuation goals. This paper focuses primarily on the optical design for the testbed and the systems-level tradeoffs between the optics and other systems due to the fact that the interferometer is on a large, lightly damped, flexible structure rather than on the ground. The testbed is designed to be a fully functioning interferometer spacecraft and makes use of flight-like hardware where possible, including an external star simulator, an attitude control system, fringe detection and tracking systems, delay lines, pointing control, laser metrology systems, and computers and electronic subsystems. The engineering decisions that led to the current optical configuration are presented and explained.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

01 Feb 1993
TL;DR: In this article, the location, number, and types of passive and active devices distributed along the structure can have a dramatic impact on overall system performance, and the manner in which structural mass is distributed can also serve as an effective mechanism for attenuating disturbance transmission between source and sensitive system components.
Abstract: Increasingly complex spacecraft will benefit from integrated design and optimization of structural, optical, and control subsystems Integrated design optimization will allow designers to make tradeoffs in objectives and constraints across these subsystems The location, number, and types of passive and active devices distributed along the structure can have a dramatic impact on overall system performance In addition, the manner in which structural mass is distributed can also serve as an effective mechanism for attenuating disturbance transmission between source and sensitive system components This paper presents recent experience using optimization tools that have been developed for addressing some of these issues on a challenging testbed design problem This particular testbed is one of a series of testbeds at the Jet Propulsion Laboratory under the sponsorship of the NASA Control Structure Interaction (CSI) Program to demonstrate nanometer level optical pathlength control on a flexible truss structure that emulates a spaceborne interferometer