• PACKET TELEMETRY GROUND STATION SIMULATION

      Watson, John Calvin; New Mexico State University (International Foundation for Telemetering, 1990-11)
      The Packet Telemetry Ground Station which receives telemetry data from the Space Station must be able to receive and process various data types including high-rate video, audio, instrumentation, electronic mail, telecommand, and engineering. The Packet Telemetry Ground Station must also be flexible to accommodate changing missions and payloads. Computer simulations of the Packet Telemetry Ground Station provide information about device specifications required to achieve an acceptable level of performance under changing telemetry data traffic configurations. This paper describes a computer simulation model for a Packet Telemetry Ground Station Architecture which was tested using ten different traffic components randomly transmitting data. The Packet Telemetry Ground Station Simulation status and utilization plots are discussed in terms of interpreting the simulation results.
    • A Parallel Computer Approach for Processing Space Station Telemetry Packets

      Polson, John T.; New Mexico State University (International Foundation for Telemetering, 1990-11)
      In the Space Station Era, the amount of required telemetry data will be enormous. NASA has proposed a space based network that may ultimately have peak data rates up to 1.2 billion bits per second. There are several levels of processing for the data once it is on the ground. The level zero processing involves reordering of packets, error correction, on line storage, and simple conversion to engineering units. Once the level zero processing is complete the data will be routed over conventional networks to the end users for further processing. The level zero processing will be done by the Data Handling Service, DHS, in real time. This paper discusses a research effort at New Mexico State University to design and simulate the DHS function using a Global Memory Message Passing, GMMP, parallel computer architecture under development in the Electrical and Computer Engineering Department. This GMMP computer is capable of moving data into and out of main memory at the peak rate. The processing is partitioned by virtual channel number. This proposed implementation does not add much latency to the network. It appears that the entire GMMP computer can be built by cleverly using existing technology.
    • PERFORMANCE MEASUREMENTS OF REAL-TIME COMPUTER SYSTEMS

      Furht, Borko; Gluch, David; Joseph, David; Modular Computer Systems, Inc., an AEG company (International Foundation for Telemetering, 1990-11)
      The performance of general purpose computers is typically measured in terms of Millions of Instructions per Second (MIPS) or Millions of Floating-Point Operations per Second (MFLOPS). Standard benchmark programs such as Whetstone, Dhrystone, and Linpack typically measure CPU speed in a single-task environment. However, a computer may have high CPU performance, but poor real-time capabilities. Therefore there is a need for performance measures specifically intended for real-time computer systems. This paper presents four methodologies, related metrics and benchmarks for objectively measuring real-time performance: (a) Tri-Dimensional Measure, (b) Process Dispatch Latency Time, (c) Rhealstone Metric, and (d) Vanada Benchmark. This proposed methodologies and related measures are applied in the performance evaluation of several real-time computer systems, and the results obtained are presented.
    • PN CODES FOR USE IN TTC SPREAD-SPECTRUM MULTIPLE-ACCESS SYSTEMS

      Fiebig, U.-C.; Schweikert, R.; German Aerospace Research Establishment (DLR) (International Foundation for Telemetering, 1990-11)
      Various PN codes for use in TTC spread-spectrum systems are considered. The evaluation is based on peak magnitudes and amplitude distributions of both the even and the odd autocorrelation and crosscorrelation functions. Furthermore the influence of the phase of a sequence on the correlation parameters is studied, multiple-access characteristics in terms of the total interference parameter are evaluated and synchronous as well as asynchronous code generation is considered.1
    • PORTABLE TELEMETRY TEST SYSTEM

      DeWaters, Ronald; Anderson, William; Naval Surface Warfare Center; Loral Data Systems (International Foundation for Telemetering, 1990-11)
      In 1986 the Navy procured Automatic Engineering Read Out (AERO) Telemetry Test Systems to receive, record, process and display telemetry data transmitted from SM-1 and SM-2 STANDARD missiles. AERO systems are self-contained data acquisition systems which are portable for field use, and are capable of receiving missile data, recording the data on analog tape, decommutating data into a computer compatible format, recording data on disk, and displaying processed data on the operator’s terminal. The original design was intended to be versatile and to accommodate future telemeters through software programming, signal switching, unit/module substitution, or add-on equipment. Original missile formats included data rates up to 50,000 data words per second. AERO systems have been used to support field testing of Navy missiles since 1987. In 1989 the AERO system requirements were changed to include support for a new STANDARD missile telemeter which transmits data at much higher rates. The AERO systems have been upgraded to support the new requirement by replacing I/O modules in the host computer, and modifying the control software. The modified system, which is hosted by a low cost DEC MicroVAX computer, records 100 percent of the telemeter data on disk at rates up to 600,000 bytes (300,000 data words) per second, and displays results for quick look review immediately after the missile test. This paper discusses the requirements for the AERO systems, the design philosophy used to ensure an upgradable path, and the benefits of that philosophy when an upgrade was required. The upgrade itself is significant because a low cost MicroVAX has been adapted to a high performance application. The AERO systems were designed, developed and upgraded by Loral Data Systems (formerly Fairchild Weston Data Systems) to the specifications of the Naval Surface Warfare Center in Dahlgren, Virginia.
    • A PREDICTABLE PERFORMANCE WIDEBAND NOISE GENERATOR

      Napier, T. M.; Peloso, R.A.; Aydin Computer and Monitor Division (International Foundation for Telemetering, 1990-11)
      An innovative digital approach to analog noise synthesis is described. This method can be used to test bit synchronizers and other communications equipment over a wide range of data rates. A generator has been built which has a constant RMS output voltage and a well-defined, closely Gaussian amplitude distribution. Its frequency spectrum is flat within 0.3 dB from dc to an upper limit which can be varied from 1 Hz to over 100 MHz. Both simulation and practical measurement have confirmed that this generator can verify the performance of bit synchronizers with respect to the standard error rate curve.
    • A PROGRAM CONTROL SYSTEM FOR RV'S ANTENNAS

      Ji-San, Lu; Beijing Institute of Special Mechanical and Electrical Devices (International Foundation for Telemetering, 1990-11)
      A attitude destalilization of a reentry vehicle (RV) due to rolling etc. during its flight is one of the major, proflems the channel design of the RV’S radio communication has been facing with. In-this Paper, the requirements of an antenna design are briefly discribed, the need for an antenna program control system is advanced, its block diagram is given, and operating principle and various concept of its components are explained.
    • A Programmable PCM Data Simulator for Microcomputer Hosts

      Cunningham, Larry E.; New Mexico State University (International Foundation for Telemetering, 1990-11)
      Modem microcomputers are proving to be viable hosts for telemetry functions, including data simulators. A specialized high-performance hardware architecture for generating and processing simulator data can be implemented on an add-in card for the microcomputer. Support software implemented on the host provides a simple, high-quality human interface with a high degree of user programmability. Based on this strategy, the Physical Science Laboratory at New Mexico State University (PSL) is developing a Programmable PCM Data Simulator for microcomputer hosts. Specifications and hardware/software architectures for PSL’s Programmable PCM Data Simulator are discussed, as well as its interactive user interface.
    • A Quantized PSK 8-State Decoder for Spectrally Efficient Communications

      Ross, Michael D.; Carden, Frank; New Mexico State University (International Foundation for Telemetering, 1990-11)
      Trellis Coded Modulation [5] combines the Viterbi Algorithm [4] with PSK or QAM signalling to achieve a coding gain, using signal set expansion as an alternative to bandwidth expansion. Optimum detection of TCM requires the calculation of Euclidean distances in the signal set space. Circular Quantization of received signal vectors as an alternative to Euclidean distance calculation has been shown to result in minimal loss of performance when used with a 4-state trellis codes [1, 2, 3]. This paper investigates the effect of circular quantization on 2 different 8-state trellis codes. The 8-state codes showed a modest gain over the 4-state code, while the effect of circular quantization on the 8-state codes paralleled the effect on the 4-state code.
    • REAL TIME UNIX TELEMETRY SUPPORT SYSTEM

      Crabtree, Steven B.; Feather, Bobby J.; Loral Data Systems (International Foundation for Telemetering, 1990-11)
      Telemetry applications today are requiring more and more computing power. The computing industry is responding to this need with more powerful machines. With these new machines the UNIX operating system is rapidly being accepted as the system of choice for the popular lowend and midrange RISC and CISC computers. The system discussed addresses the long standing question, “Can a complete UNIX system perform in a high-data-rate real-time environment?”. This paper describes the Loral Data Systems development of a Real-Time Data Transcription System (RDTS) built for Lawrence Livermore National Laboratory and TRW. This system utilizes a powerful telemetry preprocessor, internally bus-coupled to a real time UNIX host computer. An industry-standard VME-to-VME coupling provides an efficient setup, control and computational gateway for preprocessed telemetry data. This architecture illustrates a UNIX operating system to support a pseudo-real-time telemetry application.
    • REAL/IX2: THE HEART OF A VERY FAST REALTIME TEST RANGE SYSTEM

      KIBLER, R.; RODGERS, B.; BEERS, R.; JOSEPH, D.; MODCOMP; ARCATA (International Foundation for Telemetering, 1990-11)
      This paper describes the history, planning, analysis, design and performance specifications/results of a very fast, real time data acquisition and processing system. The heart of the system is MODCOMP’s fully pre-emptive, realtime UNIX operating system REAL/IX2. The entire system consists of 19 intelligent communication/interface processors on a VME bus all managed by the REAL/X2 master processor. The application for this system was developed by Arcata Assoc. of Las Vegas, NV. for use at Nellis Air Force Base. It resides in the Nellis Range Support network as the master switching node subsystem. The Nellis Network is a data communications system which supports interactive, fullduplex communication of digital data between terminal nodes on electronic combat ranges and range user nodes at Nellis AFB. Many obstacles to meeting the specified performance had to be overcome. When the system was delivered and installed by MODCOMP it met or exceeded the original data handling requirements and throughput. Other system features involve communication processor products from SIMPACT Inc. a San Diego company. The paper will present their involvement in delivering this solution system to ARCATA and ultimately Nellis AFB as well as all performance data achieved from this multi-company venture.
    • REINVENTING THE CHART RECORDER FOR THE TWENTY-FIRST CENTURY

      Gaskill, David M.; Astro-Med, Inc. (International Foundation for Telemetering, 1990-11)
      Rapid technological improvements in components and manufacturing techniques have set the stage for a thorough renovation of chart recording concepts. Today, thermal array, galvanometer, electrostatic, and lightbeam recorders co-exist for reasons both historical and practical. At one time or another each has held a competitive advantage but now it is time to synthesize a new recorder standard combining the strengths of each of today’s technologies with a generous reserve for future enhancements.
    • The Research on Optimization of DPSK Errors Propagation

      Mukun, Wang; Bingxing, Xu; Tingxiag, Zhou; Harbin Institute of Technology (International Foundation for Telemetering, 1990-11)
      This paper put its focus on the errors propagation given by Differential phase shift keying (DPSK below) in industrial telemetering systems. There is analytical, comparative and calculative work about DPSK signals formed with different encoding moduses and about their errors propagation after demodulation.
    • SCALE MODEL PENETRATOR INSTRUMENTATION AND TESTING

      Salazar, V. P.; Franco, R. J.; Sandia National Laboratories Telemetry Department (International Foundation for Telemetering, 1990-11)
      Sandia National Laboratories Telemetry Technology Development Division has designed and fielded earth and ice penetrator instrumentation recorders for many years. Recently we developed a miniature, reusable, transient-event recorder for use in scale model penetration tests. The miniature size of the recorder permits testing of penetrators as small as 4 inches in outside diameter by 20 inches in length. The recorder can survive and record shock environments exceeding 4,000 times the acceleration of gravity (gs). Typical applications are rock, soil, and ice penetration tests launched from a gas gun developed by Advanced Projects Division III. Typical impact velocities range from 600 to 1,000 feet per second.
    • THE SEARCHING METHOD OF QUASI-OPTIMUM GROUP SYNC CODES ON THE SUBSET OF PN SEQUENCES

      Jie, Cao; Qiu-cheng, Xie; Nanjing Aeronautical Institute, China (International Foundation for Telemetering, 1990-11)
      As the code length is increasing, the search of optimum group sync codes will be more and more difficult, even impossible. This paper gives the searching method of quasi-optimum group sync codes on the small subset of PN sequences -- CVT-TAIL SEARCHING METHOD and PREFIX-SUFFIX SEARCHING METHOD. We have searched out quasi-optimum group sync codes for their lengths N=32-63 by this method and compared them with corresponding optimum group sync codes for their lengths N=32-54. They are very approximative. The total searching time is only several seconds. This method may solves the problems among error sync probability, code length and searching time. So, it is a good and practicable searching method for long code.
    • Self-Contained High-G Wideband Telemetry System for the SADARM Program

      Grassano, Chris J.; U.S. Armament Research Development and Engineering Center (International Foundation for Telemetering, 1990-11)
      The Telemetry Section was tasked with the effort to develop two projectile/missile wideband telemeters in support of the Sense And Destroy ARMor (SADARM) Program. These telemeters were designed to withstand the complete operating environments of three carriers, namely the Multiple Launch Rocket System (MLRS), and both the 155mm and 8in guns. The development of these systems was based on gun proven designs and components, but additional design and qualification had to be conducted for the added features. A re-radiation (RERAD) system was also developed to enhance data acquisition in the field. The scope of this paper will include an electrical subsystem design analysis, mechanical design overview, system capabilities, qualification testing, test scenario configuration, and a brief discussion of the RF link analysis and RERAD system. The major advantages of these telemeters are the large amount of data throughput, the fact that the entire system is self-contained, and that they are qualified for use in extreme environments.
    • A SMALL FORMAT ANALOG RECORDING SYSTEM

      GUISINGER, BARRETT E.; Datatape Technology Center (International Foundation for Telemetering, 1990-11)
      This paper describes the design and implementation of a low cost, analog, DC to 6 MHz bandwidth instrumentation recorder based on an industrial grade SVHS transport mechanism. The system is designed to meet all of it’s specifications utilizing standard offthe-shelf SVHS media. Novel digital processing is described allowing a fully timebase corrected recorder/reproducer to be housed in a one-half rack enclosure measuring 7"H x 8.5"W x 18"D and weighing less than 25 pounds.
    • Small Multipurpose Stored Data Acquisition System

      Hauser, G. C.; Ryerson, D. E.; Sandia National Laboratories Telemetry Department (International Foundation for Telemetering, 1990-11)
      Sandia National Laboratories Telemetry Department has designed and is fielding a small, inexpensive multipurpose stored data acquisition system in tests ranging from 6000 meters below the ocean surface in seafloor penetrators to 40,000 meters above sea level in gamma ray telescope balloons. The system consists of a simple microprocessor-controlled unit which digitizes analog data and stores the data in memory for readout after the test by a portable personal computer. The system has been used in over ninety tests consisting of parachute drops, water entry tests, vehicle environmental monitoring, and seafloor penetration tests. Data typically recorded with the system are acceleration, strain, temperature, pressure, and angular velocity. The system is also capable of generating control functions such as parachute release.
    • SMART MUNITIONS PCM TELEMETRY SYSTEM

      Wigfall, Glenn D.; US Armament Research, Development and Engineering Center (International Foundation for Telemetering, 1990-11)
      The last decade brought about the development of “smart” weapons and munitions that proved to be more efficient than conventional weapons based on their efficiency in the number of targets hit relative to the number hit using conventional weapons. The awakening of sensor-controlled, sensor-guided munitions technology has introduced a definitive need for telemetry instrumentation in developmental testing of this rapidly growing field. To satisfy the Army’s need for sensor-controlled, anti-tank munitions, several development programs are under way for the research and design of these systems. Telemetry has been a critical element in the development of these programs. From the program’s conception and through to its completion, the Armament, Research, Development, and Engineering Center-Telemetry Section has developed data acquisition systems to monitor the activity of such sensorcontrolled smart projectiles to support Army programs. This paper will discuss the development and use of a PCM telemetry system that has had tremendous success in use with these types of projectile programs in their sensor development and system integration stages. The application, albeit specific to these projectile programs, can be tailored to meet the needs of numerous test configurations within the Army or other organizations facing this need.
    • A State-of-the-Art Data Acquisition System

      Talmadge, Richard D.; Radmand, Mansour; Wright Research & Development Center; Aydin Vector Division (International Foundation for Telemetering, 1990-11)
      Recent developments in manufacturing technology have afforded a new capability in miniaturized instrumentation systems. The advent of ASIC (Application Specific Integrated Circuit) technology has provided the tools to implement very sophisticated signal conditioning circuits in micro-miniature instrumentation. This paper discusses the development of the Automatic Gain Ranging Amplifier (AGRA) and its implementation in the Aydin Vector MMSC-800 instrumentation package. Also discussed is the miniaturization of a 1553 Bus monitor, IRIG-B Time Code reader/accumulator and the development of a helical scan miniature tape recording system capable of recording 2+ hours of 3.4 Mbps data. The paper concludes by giving applications for and benefits of using this new state-of-the-art instrumentation.