Martin, Fredric W. (International Foundation for Telemetering, 1994-10)
      Use of top-down design principles and standard interface techniques provides the basis for a global telemetry data collection, analysis, and satellite control network with a high degree of survivability via use of distributed architecture. Use of Commercial Off-The-Shelf (COTS) hardware and software minimizes costs and provides for easy expansion and adaption to new satellite constellations. Adaptive techniques and low cost multiplexers provide for graceful system wide degradation and flexible data distribution.
    • Distributed Interactive Simulation (DIS): An Overview Of The System And Its Potential Uses

      Boyd, Edward L.; Novits, Charles S.; Boisvert, Robert A.; Encore Computers (International Foundation for Telemetering, 1994-10)
      The Distributed Interactive Simulation (DIS) concept, since its inception, has been defined into three separate but distinct areas of service. • Viewing of data in the real-time environment. • Multiple range viewing and usage of"real-time data." • Problems with the sharing of information through DIS. This paper will discuss the DIS concept and some of the various methods available to display this data to users of the system.

      Hoefener, Carl E.; Interstate Electronics Corporation (International Foundation for Telemetering, 1994-10)
      With the decline in military budgets worldwide, the need for ever more effective training is becoming apparent. The size of the armed forces is being reduced, so the remaining members have to be trained to be more effective and efficient in doing their jobs. To improve effectiveness and efficiency of performance, military training needs will be increased. Our largest training costs will be in pilot training because of the high cost of keeping aircraft in the air. When we look at the cost of training a pilot to operate in a multiplayer scenario against a large number of unfriendly aircraft and a large number of ground threats, the cost of training is tremendous. It requires a large number of personnel, aircraft and ground equipment to train a limited number of pilots. Our current Red Flag exercises can require as many as 75 aircraft in the air simultaneously plus a large number of ground threats and a large number of support personnel. This can amount to a prohibitive cost to train a limited number of pilots.
    • Divide and Conquer: Improving Post-Flight Data Processing

      Scardillo, Mike; Nisel, Mike; Perimeter Computer Systems, Inc. (International Foundation for Telemetering, 1994-10)
      This paper describes Dryden Flight Research Center's (DFRC's) transition from a mainframe-oriented post-flight data processing system, heavily dependent upon manual operation and scheduling, to a modern, distributed, highly automated system. After developing requirements and a concept development plan, DFRC replaced one multiple-CPU mainframe with five specialized servers, distributing the processing workload and separating functions. Access to flight data was improved by buying and building client server automated retrieval software that takes advantage of the local area network, and by providing over 500 gigabytes of on-line archival storage space. Engineering customers see improved access times and continuous availability (7-days per week, 24-hours per day) of flight research data. A significant reduction in computer operator workload was achieved, and minimal computer operator intervention is now required for flight data retrieval operations. This new post-flight system architecture was designed and built to provide flexibility, extensibility and cost-effective upgradeability. Almost two years of successful operation have proven the viability of the system. Future improvements will focus on decreasing the elapsed time between raw data capture and engineering unit data archival, increasing the on-line archival storage capacity, and decreasing the automated data retrieval response time.
    • Dual Function Transponder: A Data Link for the Next Generation

      DeViso, Hans; Troth, Bill (International Foundation for Telemetering, 1994-10)
      Future U.S. Navy at-sea and littoral battle group training range instrumentation requires a new, secure, high data rate link This link must be capable of providing the ranges with the capacity to increase the number of players, increase the amount of threat simulation, and allow an improved Global Positioning System (GPS) based position tracking system to be implemented This paper describes a Dual Function Transponder (DFT) capable of operating on any R-CUBED (Relay, Reporter, Responder) based range as well as any TACTS/ACMI range without modification of either range type. In addition, the DFT provides a new increased data rate capability for use by planned future ranges, enabling a dramatic increase in the number of participants as well as significantly increasing the quantity of data that can be communicated by each player. Miniaturization and programmability are the keys to this development and many of the methods used are described.

      Gaskill, David M.; ASTRO-MED INC. (International Foundation for Telemetering, 1994-10)
      This paper will examine real-time ethernet capabilities in general and will describe in detail a practical implementation of an Ethernet interface that allows commands and data to be sent to a thermal array recorder using a standard TCP/IP, Novell, or similar interface. This interface allows two types of data transmission. First, real-time data may be sent at low rates for slow speed monitoring or, second, high speed packets may be sent for storage in local FIFO memory. A header containing sample rate information allows the recorder to reconstruct the data on paper smoothly so that it has the appearance of real-time recording but is slightly delayed. In addition, normal host control commands may be interleaved with data for a complete high speed digital data system.
    • The Evolution of a Telemetry Groundstation Utilizing Today's Open Standards

      Friedman, Paul; Loral Test & Information Systems (International Foundation for Telemetering, 1994-10)
      Computer industry and government standards have had a profound effect on modern telemetry ground stations. Installations are no longer one-of-a-kind inflexible systems built to the specifications of a single user - meeting their needs without regard to the rest of the community. This paper will examine the effect that the evolution of significant graphics, network, operating system, and architecture standards has had on commercial telemetry ground station system products. It will also explore the issue of "open" versus proprietary architectures. The paper closes with a description of a system designed from its very inception to meet and grow with standards.

      Hazra, Tushar K.; Stephenson, Richard A.; Troendly, Gregory M.; Martin Marietta Services, Inc. (International Foundation for Telemetering, 1994-10)
      During the recent years of small satellite space access missions, the trend has been towards designing low-cost ground control centers to maintain the space/ground cost ratio. The use of personal computers (PC) in combination with high speed transputer modules as embedded parallel processors, provides a relatively affordable, highly versatile, and reliable desktop workstation upon which satellite telemetry systems can be built to meet the ever-growing challenge of the space missions today and of the future. This paper presents the feasibility of cost effective, high performance ground systems and a quantitative analysis and study in terms of performance, speedup, efficiency, and the compatibility of the architecture to commercial off the shelf (COTS) tools, and finally, introduces an operational high performance, low cost ground system to strengthen the insight of the concept.
    • GPS as a Telemetry Sensor

      Qishan, Zhang; Xianliang, Li; Beijing University of Aeronautics and Astronautics (International Foundation for Telemetering, 1994-10)
      GPS is required in today's vehicle tracking and navigation applications. The Navigation Satellite Timing and Ranging (NAVSTAR GPS) is an all-weather. Radio based, satellite navigation system that enables users to accurately determine 3-dimensional position, velocity and time. So it is an intelligent sensor intended to be used as a component in a system for public service.

      Rucinski, Gary; BBN Systems and Technologies (International Foundation for Telemetering, 1994-10)
      In recent years the extension of interactive simulation technology to involve simulators and live vehicles from geographically dispersed sites has produced a demand for high-bandwidth communication networks that can provide guaranteed quality of service (e.g., insured availability of bandwidth and upper bounds on end-to-end delay). This paper reviews the requirements distributed interactive simulation places on the communications infrastructure and describes the Defense Simulation Internet (DSI), a network developed by the Advanced Research Projects Agency to support distributed interactive simulations. Key features of the DSI are: more than 120 participating sites spanning Europe, the United States and Asia; use of a resource reservation mechanism to provide guaranteed quality of service; and support for communication between classified sites. Furthermore, the paper describes the internetworking protocols used in the DSI to provide guaranteed quality of service and to support transmission of classified communications. Other topics discussed in the paper are research efforts that anticipate increased load on the DSI and the relevance of the technology to the integration of the telemetry range and distributed interactive simulations.

      Schwartz, Paul D.; Hersman, Christopher B.; The Johns Hopkins University (International Foundation for Telemetering, 1994-10)
      A system to generate a contiguous high speed time division multiplexed (TDM) spacecraft downlink data stream has been developed. The 25 MBPS downlink data stream contains high rate real time imager data, intermediate rate subsystem processor data, and low rate spacecraft housekeeping data. Imager data is transferred directly into the appropriate TDM downlink data window using control signals and clocks generated in the central data formatter and distributed to the data sources. Cable and electronics delays inherent in this process can amount to several clock periods, while the uncertainty and variations in those delays (e.g. temperature effects) can exceed the clock period. Unique (patent pending) electronic circuitry has been included in the data formatter to sense the total data gathering delay for each high speed data source and use the results to control series programmable delay elements to equalize the delays from all sources and permit the formation of a contiguous output data stream.

      Crouch, Viv; Goldstein, Anna; RAAF Base; Loral Test & Information Systems (International Foundation for Telemetering, 1994-10)
      The Aircraft Research and Development Unit (ARDU) of the Royal Australian Air Force (RAAF) is the only agency in Australia that performs the full spectrum of military flight testing and is the new custodian of the instrumented weapons range at Woomera. Receiving early attention will be the upgrade and integration of ARDU's telemetry systems with the meteorological and tracking data acquisition capabilities at Woomera to minimize overhead and data turnaround time. To achieve these goals, maximum modularity, extensibility, and product interoperability is being sought in the proposed architecture of all the systems that will need to cooperate on the forecast test programmes. These goals are also driven by the need to be responsive to a wide variety of tasks which presently include structural flight testing of fighter and training aircraft, weapons systems performance evaluation on a variety of combatant aircraft, and a host of other tasks associated with all fixed and rotary wing aircraft in the Army and Air Force inventory. Of all these tasks however, ARDU sees that responsiveness to future testing of F-111Cs fitted with unique Digital Flight Control Systems along with USAF standard F-111Gs may place the most significant demands on data handling —particularly in regard to providing an avionics bus diagnostic capability when performing Operational Flight Programme (OFP) changes to the mission computers. With the timely assistance and advice of Loral Test & Information Systems, who has long-term experience in supporting USAF F-111 test programmes, ARDU is confident of making wise design decisions that will provide the desired flexibility and, at the same time, minimize life-cycle costs by ensuring compliance with the appropriate telemetry and open systems standards. As well, via cooperative agreements with the USAF, the potential exists to acquire proven software products without needing to fund the development costs already absorbed by the USAF. This paper presents ARDU's perception of future needs, a view by LTIS of how best to meet those needs, and, based on ARDU data, a view of how LTIS' proposal will satisfy the requirement to provide maximum extensibility with minimum life-cycle costs.
    • Improved Groundstation Consoles Using New Visualization Techniques and Graphics Technology

      McDaid, John P., Jr.; Loral Test & Information Systems (International Foundation for Telemetering, 1994-10)
      The advance from alphanumeric terminals to displays using new graphics technologies like the X Window System and Microsoft Windows has in many cases failed to tap the full potential of these technologies. Many common telemetry tasks continue to use similar user interfaces based on tabular real-time data displays and menus. This paper will demonstrate the application of new techniques which, when used with emerging graphics technologies, will maximize the effectiveness of telemetry ground station consoles. Advances in visualization and animation have greatly enhanced the information content of current displays and significantly improved their ease of use.

      Richard, Gaetan C.; Gonzalez, Daniel G.; DECS, Inc; Malibu Research, Inc (International Foundation for Telemetering, 1994-10)
      The design of a telemetry tracking system is generally centered around its desired RF performance which is typically specified in terms of beamwidth, gain and/or G/T. These parameters determine the size of the reflector used in a given application and consequently dictate the required size and performance of the associated pedestal. Any subsequent improvement in the RF performance of such a system is primarily achieved by increasing the size of its reflector. The magnitude of the improvement realized is therefore limited by the load handling capability of the pedestal. In most instances, the substitution of a larger reflector with its increased inertia and wind loading causes a significant degradation in the dynamic performance of the tracking system. This paper describes how the figure of merit (G/T) of a specific dual axis telemetry tracking system can be improved by a minimum of 7.3 dB/K° without impacting its dynamic performance or increasing its weight. These impressive results are made feasible by the innovative pairing of a unique design planar reflector with a novel implementation of the conical scanner technology. The FLAPS™ reflector incorporates a newly developed concept which features lightweight construction and very low wind load coefficients [1, 2]. The conical scanner is a lightweight version of the DECS tracking feed system described in the referenced technical paper [3].
    • INTA Mobile Telemetry Acquisition System

      Armengod, Rafael G.; Coll, Vicente Millet; Leon, Rosendo J.; Instituto Nacional de Technica Aeroespacial; Microdyne Corporation (International Foundation for Telemetering, 1994-10)
      INTA is the Institute for Aerospace Technologies in Spain. Test programs at INTA require extensive flight test capabilities and for this reason in mid 1990, INTA created the Flight Test Center, designated CEA. The CEA is responsible for providing flight test support for all current and future programs including RPV Test, Rocket Launches, Balloons and Missile Test. With the increasing requirement for flight test at several locations throughout Spain, a program was launched to acquire a mobile capability which could support these test ranges in current flight test requirements as well as anticipated future requirements.
    • International Telemetering Conference Proceedings, Volume 30 (1994)

      International Foundation for Telemetering, 1994-10
    • Low Cost Vector Scoring System for Airborne Targets

      Whiteman, Don; Bradley, Joe; Naval Air Warfare Center, Weapons Division (International Foundation for Telemetering, 1994-10)
      Testing of airborne weapons systems often requires that a scoring system be placed on the target drone to obtain critical miss distance data. Advanced weapons utilizing directional warheads often require a scoring system which yields vector, miss distance and miss direction, information. Scalar scoring systems currently in use are relatively simple and inexpensive. Vector scoring systems are typically complex and the cost of systems which are currently available or are being developed can be prohibitively expensive. Due to the current military budget decline, development of a low cost vector scoring system is desirable This paper introduces a low cost vector scoring system developed for airborne target drones and based on an inexpensive scalar scoring system currently in use. To meet the low cost criteria, vector operation is achieved via minimal modifications to the existing scalar system.

      Lundberg, L. L.; Naval Air Warfare Center (International Foundation for Telemetering, 1994-10)

      Wu, Wei-Ren; Li, Hua; Beijing Research Institute of Telemetry (International Foundation for Telemetering, 1994-10)
      A real time distributed computer telemetry system based on network is described. It is a new generation of open telemetry system in China, which can parallel acquire and process up to 8 data streams of 100bps~3.5Mbps and optimize automatically distribution of processing tasks by using load-balance technique. PCM PSK QPSK PACM may be suitable to the system and the format switched within less than 1 second. The system has been successfully used in the field of aerospace. There are models of automobile, shipboard, airborne as well as ground station for the system. This paper discusses mainly system architecture, performance, principle, and system features.
    • Network Configuration for Range Interconnectivity

      Douglas, Steven R.; Naval Warfare Assessment Division (International Foundation for Telemetering, 1994-10)
      A demonstration of near real-time performance assessment for the Program Executive Officer for Cruise Missiles Project and Unmanned Aerial Vehicles, Cruise Test Directorate, PEO(CU)-CT, was conducted between 22 March 1994 through 4 May 1994. The demonstration involved the temporary installation of a portable TOMAHAWK telemetry recording and telecommunications capability at the Air Force Development Test Center range at Eglin Air Force Base, Florida and a receiving telecommunications capability at the Naval Warfare Assessment Division (NWAD), Corona, California. The system was successfully used on 4 May 1994 to record TOMAHAWK missile telemetry data in real-time in support of Operational Test Launch (OTL)-163 and to transfer that data to the weapons system performance analysts at NWAD in near real-time. The one hour and three minutes of flight data was compressed in real-time as it was recorded, then, after completion of the flight, the data was transferred to NWAD in about 12 minutes using the switched 56 kbps network. Additional transfers using the Defense Commercial Telecommunications Network (DCTN) were also conducted. All transfers were secured using ethernet encryptors. The data was processed by both the NWAD telemetry ground station and the TOMAHAWK workstation complex. This paper quantifies the results and documents the lessons learned from this demonstration and proposes a standardized system design for possible implementation at TOMAHAWK test range sites in the future. A position is taken that for situations where the remote site (e.g. other range or data analysis site) does not exercise direct operational control over the test/host range, near real-time data relay solutions are not only as adequate, but in many cases are preferable to real-time solutions.