• Draft Standard for Digital Transmission of Television Images

      Rieger, James L.; Gattis, Sherri; Naval Weapons Center (International Foundation for Telemetering, 1988-10)
      This paper describes the characteristics of the HORACE digital protocol intended for transmission of black-and-white standard television images and associated data through a digital channel and reconstruction of an NTSC standard television picture at the receiving end, using adaptive transmission to allow maximum picture quality at a selected data rate. Tradeoffs are discussed for transmission rates in the range from near DC to over 40 Mbits/second. The HORACE protocol will be a government test range standard to be issued by the Telecommunications Group [TCG] of the Range Commanders' Council as RCC Document 209.
    • A Four-State Trellis-Coded 8-PSK Modulation Computer Simulation

      Kopp, Brian; New Mexico State University (International Foundation for Telemetering, 1988-10)
      The continuing growth of the telecommunications industry has created a steadily increasing need for higher performance communications systems - systems that can transfer data at faster rates while meeting stringent bit error rate requirements. In the case of satellite and mobile communications these same systems must also maintain minimum size and power consumption requirements. To help implement this industry demand computer simulations of communications systems can be a viable tool. Simulators can be used to demonstrate feasibility while maintaining minimum research and development costs during the design phase of these new and more complex communications systems. One type of system where simulation has proved helpful has been trellis-codedmodulation (TCM). This paper documents a simulation of a four-state trellis-coded eight- PSK modulation scheme currently being researched at New Mexico State University (NMSU). In the past simulations of convolutionally coded schemes have used binary symbols in the decoding process. In TCM the Euclidean space components of the modulation scheme are used in place of the binary symbols. The simulator under development incorporates these Euclidean signal components which are taken from an eight-PSK signal constellation. Soft-decision maximum likelihood decoding using trellis trace-back techniques are then applied to the Euclidean signal components to recover the simulated transmitted data. The simulator supplies the user with the number of undetected errors generated during a simulation as well as the bit error rate for a given signal to noise ratio. This simulator is intended to provide an environment for investigating improved communication system designs and it is hoped that the results that are obtained from such telecommunication simulators will help satisfy the ever increasing demands of the telecommunications industry. It should be noted that the research being conducted at NMSU on TCM is being directed by Dr. Frank Carden. The development of the simulator was conducted by the author to assist Dr. Carden in the continuing investigation of TCM.
    • Application for Spacecraft of the 90's Using MicroDACS Technology

      Horn, Paul; SCI Technology Inc. (International Foundation for Telemetering, 1988-10)
      Recent developments in electronics have made possible the miniaturization of many of the subsystem components associated with a typical spacecraft data acquisition and control system. This paper describes a low power consumption, fault tolerant, high performance data acquisition and control system design utilizing third generation hardware. The system includes built in test autonomy, redundancy management and fault tolerant communication busses, and supports multiprocessing with up to five 35 Million instructions per second (Mips) processors.
    • Characteristics and Uses of Multipoint Radio in the 950 MHz Telemetry Band

      Ziemienski, Bruce V.; City of Fresno, California (International Foundation for Telemetering, 1988-10)
      Data communications is one of the fastest growing industries today. Many see data communications as one key to increasing workforce productivity. Communications circuits are becoming increasingly expensive especially if wireline is used. A simple solution to this problem is utilized radio. With the advent of the new Multi- Point distribution Service on the 950 MHz Microwave band, simple and relatively inexpensive solutions to data communications distribution has been solved. This paper will explore this new service and its uses as related to data communications.
    • Analysis On the Optimum Group Synchronization Code of TIROS Satellite

      Qiu-Cheng, Xie; Jie, Cao; Nanjing Aeronautical Institute (International Foundation for Telemetering, 1988-10)
      In this paper, the group synchronization code (length n = 60 bit) of the TIROS Satellite was analysed. It seems to us the code isn't optimization. A series of optimum group sync codes (n = 60) have been searched out with error tolerance E = 1, 2, 3, 4, 5, 6 and 10, 12. Their error sync probabilities are less than the error sync probability of the TIROS code (from two times to two order of magnitudes about). These optimum or qansi-optimum codes will be presented for application in the second generation of the Meteorological Satellites of China.
    • Data Transport Subsystem: The SFOC Glue

      Parr, Stephen J.; California Institute of Technology (International Foundation for Telemetering, 1988-10)
      The Data Transport Subsystem (DTS) is a core subsystem of SFOC which holds together the GIFs, TISes, DMDs, DTVs and other SFOC application subsystems allowing them to operate in a distributed LAN based workstation environment. DTS does this by providing two primary features. The first feature is transparent local and remote interprocess communication. The communications interface is identical between two application subsystem processes whether they're running in the same machine or different machines. The second feature is the Logical Name Server, which makes connections on a name basis without regard to location or network topology. With these two features SFOC becomes a distributed system. Processes within a subsystem can even be distributed to perform load leveling and enhance system performance. Distribution fosters the use of redundancy and hot backups by allowing nodes to serve multiple purposes. Distribution allows isolation of mission telemetry while providing shared use of a common database. It supports the SFOC goal of off-the-shelf hardware expansion and upgrade. DTS provides an open-close-send-receive model of interprocess communication. It offers three types of service: virtual circuit, datagram and broadcast. The virtual circuit service supplies a full duplex path between communication endpoints and guarantees data integrity. The datagram service allows many communications endpoints to send to one endpoint. This is useful for sending status to a central process. The broadcast service allows a process to send to many receiver endpoints. This can be used for continuous monitoring of telemetry streams by multiple processes.
    • International Telemetering Conference Proceedings, Volume 24 (1988)

      Unknown author (International Foundation for Telemetering, 1988-10)
    • uDACS Micropackaged Data Acquisition and Control System

      Sodini, Gregory L.; SCI Technology Inc. (International Foundation for Telemetering, 1988-10)
      The miniaturization of Aerospace Systems, has created a demand for effective, compact, lightweight, and power efficient General Purpose Stand-Alone Flight Computers, as well as Command, Data Handling and Control Systems, that maintain High Reliability, Full Redundancy, Radiation Hardness, Explosive Processing Speed, Rapid Throughput, and High Accuracy. The innovative design techniques used in the uDACS (Micropackaged Data Acquisition and Control System) offer a unique and comprehensive solution to this quandary.
    • Addition of Video to Telemetry Tracking System Upgrades Spatial Data to Radar-Quality

      Fournier, John; Sullivan, Arthur; Electro Magnetic Processes, Inc. (International Foundation for Telemetering, 1988-10)
      Traditionally telemetry trackers have not been required to provide precision space-position data. Such data, when needed, has required expensive radar or optical support. Currently, an increasing number of flight test operations have need of precision spatial data, in conjunction with telemetry data reception, in areas where no radar or optical support is available. To meet this need, EMP has carefully combined existing technologies to upgrade the angle output data accuracy of telemetry trackers to the level expected of precision radars. A TV Boresight Camera and video Tracking Error Detector combined with the EMP Model ACU-6 microprocessor-based Antenna Control Unit provide the means to automatically measure and store all of the systematic bias errors inherent in a telemetry tracking system. The resulting error model is used to provide real-time-data-correction for each error parameter. Video tracking provides correction for dynamic tracking errors in real time. Calibrations utilize boresight and stellar targets. The design goal to reduce dynamic angle data error to <10 arc seconds, RMS, appears to be reasonable.
    • Application of Digital Video in Modern Telemetry Systems

      Druif, David; LORAL/CONIC (International Foundation for Telemetering, 1988-10)
      This paper addresses the system issues of applying digital video to modern telemetry systems and problems. Comparison of typical link budgets, block diagrams, as well as improvements and limitations for both analog and digital video are included. Encryption issues are covered from a generic unclassified point of view.
    • Spaceborne Recording Systems for the Space Station Era

      Muench, Jerry; Odetics, Inc. (International Foundation for Telemetering, 1988-10)
      A detailed review of spaceborne magnetic tape recorder technology from the late 1970s to the Space Station era is presented. Background information indicates the oft maligned space tape recorder has continued to demonstrate improving reliability since the marginal performances throughout the 1960s. Specifically, the SPOT recorder is reviewed in technical detail to show evolution through LANDSAT 6 and 7 versions, JERS-1, and finally the proposed ultimate version for Space Station/EOS. Enabling technologies include active tape tracking, magnetic recording head advances, and extensive use of ASIC devices to reduce the EEE piece part count. Suitability of the proposed Space Station/EOS recorder technologies for even more advanced future applications are discussed with data rates to 1 Gbps and storage capacities to 1 X 10¹² bits.
    • A Survays On Fading Channel Over West - Java Area for Flight Test Radio Telemetering Purposes

      Soelaiman, Adi Dharma; Pudjiastuti, Rina; Indonesian Aircraft Industry Ltd. (International Foundation for Telemetering, 1988-10)
      This paper discusses one approach to determine a characteristic of West - Java's air and ground segment as a block-box to accomodate radio waves propagation, especially in L-band ranges, by evaluating both the topographical data and radio reception pattern as measured from ground based telemetry receiving-end system. All the measured signals are random and assumed to be stationair and ergodic. In order to characterize the channel for polarization diversity reception, some statistical analysis are applied to the signal strength measured of both - RHCP and LHCP components of 1531 MHz propagated waves as transmitted fr om NC212-200 PK-NZJ-aircraft. Some computer calculated correlograms of measured data are shown herewith, it is focused for a certain radio corridor at radial 265E relative to the ground based receiving antenna. More over some curves of predicted multipath gain factor are also presented to gain more theoretical back ground. When this paper is written, a further field experiments on the matter concerned is beeing conducted.
    • Video Compression Techniques

      Cilke, Tom; LORAL/CONIC (International Foundation for Telemetering, 1988-10)
      This paper will attempt to present algorithms commonly used for video compression, and their effectiveness in aerospace applications where size, weight, and power are of prime importance. These techniques will include samples of one-, two-, and three-dimensional algorithms. Implementation of these algorithms into usable hardware is also explored but limited to monochrome video only.
    • S-Band Phased Array Antenna for the E-9A

      Cooke, William P.; Burdette, Lawrence; Zoledziowski, Severyn; Hatcher, Glenn; Georgia Institute of Technology; LTVMEG; Eglin Air Force Base (International Foundation for Telemetering, 1988-10)
      This paper describes the requirement, design and test results for the Airborne Phased Telemetry Array for the E-9A Airborne Platform.
    • Evolutionary Factors in the Development of a Realtime Multiprocessor System

      Trover, William F.; Teledyne Controls (International Foundation for Telemetering, 1988-10)
      Architectural decisions made three years ago in the design of a high speed preprocessor system for realtime data processing at sustained rates of 200k to 300k parameters per second were driven by the need to provide expansion flexibility and to permit the user to program application algorithms through the use of a high level language. The original design concept was a two bus architecture which would accept and merge data from up to 8 data sources with the required number of parallel computers driven by the realtime processing needs - not the 1.5M wps aggregate throughput capability. Other configuration variables were to enable the use of an optional raw data circular (wrap around) file for intermaneuver or anomaly analysis, the number of analog and discrete outputs for strip chart and visual displays, and the ability to support a wide range of processed data throughputs to one or more host computers. As a result of future defined requirements, the expansion capability ultimately grew to allow up to 30 data sources, 256 analog outputs, and 196 discrete outputs. A concurrent study of the engine and airborne test community showed that in many applications over 50% of the processing was restricted to repetitive computations such as FFTs and first order EU conversions. Although bit slice processors were much faster than general purpose Application Processors (APs), nobody in the user community said they wanted to write microcode to install their application programs. As the first customer's requirements could be easily handled by adding a few APs, the initial system design concentrated only on general purpose processors with provisions being made for the future addition of special purpose digital signal processors to co-reside with the general purpose APs. At the some time, much of the rotary wing test community's data processing was highly floating point intensive so the AP processor was designed with an independent floating point processor using the fastest possible device technology. The original two bus architecture using industry standard Versa and VME buses evolved as the design matured to a six bus architecture capable of supporting up to 60 parallel processors. The use of industry standard buses has permitted successful development of configurations using a wide range of third party processors and peripherals from a variety of sources. Larger system configurations are implemented by a multi-chassis structure with functions arranged so that no realtime bus is unterminated or physically longer than 19 inches. The simultaneous software development supporting these changes and encompassing 25 man-years of work is beyond the scope of this paper and will be covered in a separate publication.
    • RF Hybrid Linear Amplifier Using Diamond Heat Sink

      Karabudak, Nafiz; Aydin Vector Division (International Foundation for Telemetering, 1988-10)
      This paper will address the applications and methods used for a high power output RF linear small signal amplifier using diamond heat sink. Comparison and the benefits of using diamond heat spreaders will be reviewed. Agrowing number of researchers, engineers and scientists are looking into the applications of diamond's unique properties such as physical, electrical and optical.
    • AMRAAM S-Band Telemetry Antenna Theory and Development

      Koontz, Rollin H.; Pacific Missile Test Center (International Foundation for Telemetering, 1988-10)
      The Advanced Medium-Range Air-To-Air Missile (AMRAAM) is one of our newest additions to tactical weaponry. Recently the Pacific Missile Test Center (PMTC) was given the responsibility to develop a new telemetry (TM) package for the AMRAAM that is warhead compatible. The difficulty of this undertaking can best be appreciated if one examines a sketch of the missile as shown in figure 1. Note that the sketch reveals a harness cover opposite top dead center (TDC) for flight that extends over 2/3 the length of the missile. Within this cover is housed all interconnect electrical cabling for the missile. It was also within this harness cover that PMTC had to mount the entire TM package including the S-band antenna. Of necessity there had to be an increase in the height of the harness cover in order to accommodate the TM package. However, this increase was held to only 0.10 inches resulting in no significant change to the flight profile. This report deals only with the design and development of the harness cover mounted TM antenna.
    • Digital Color TV Telemetry

      Schaphorst, Richard A.; Comeau, Charles P.; Delta Information Systems, Inc. (International Foundation for Telemetering, 1988-10)
      In most of the initial applications of digital TV telemetry the video source signal is monochrome (typically RS-170 standard). However color TV is now employed extensively in many of the government test ranges, and it is likely that it will be required to digitally transmit the NTSC color TV signal for security and other reasons. It is also likely that the bit rates which will be employed for this transmission will range from 1 to 20 mbps depending upon the application. This paper presents the general issues involved in digitizing color TV signals, describes alternative color coding techniques, compares these alternatives, and describes one particularly promising approach in detail. Alternative coding techniques that will be discussed and analyzed include direct coding of the composite NTSC signal as well as several component coding concepts - Y, I, Q; Y, R-Y, B-Y; and the transmission of chroma lines on an alternating basis. Specific techniques for multiplexing the digitized color component signals will be presented. It is desirable that the color coding technique be an incremental expansion relative to existing monochrome coding concepts. One particular technique which shows promise of meeting this objective is presented and discussed.
    • Ruggedized Television Compression Equipment for Test Range Systems

      Gattis, Sherri L.; Naval Weapons Center (International Foundation for Telemetering, 1988-10)
      The Wideband Data Protection Program was necessitated from the need to develop digitized, compressed video to enable encryption.
    • Telemetry Data Processing: A Modular, Expandable Approach

      Devlin, Steve; Aydin Monitor Systems (International Foundation for Telemetering, 1988-10)
      The growing complexity of missle, aircraft, and space vehicle systems, along with the advent of fly-by-wire and ultra-high performance unstable airframe technology has created an exploding demand for real time processing power. Recent VLSI developements have allowed addressing these needs in the design of a multi-processor subsystem supplying 10 MIPS and 5 MFLOPS per processor. To provide up to 70 MIPS a Digital Signal Processing subsystem may be configured with up to 7 Processors. Multiple subsystems may be employed in a data processing system to give the user virtually unlimited processing power. Within the DSP module, communication between cards is over a high speed, arbitrated Private Data bus. This prevents the saturation of the system bus with intermediate results, and allows a multiple processor configuration to make full use of each processor. Design goals for a single processor included executing number system conversions, data compression algorithms and 1st order polynomials in under 2 microseconds, and 5th order polynomials in under 4 microseconds. The processor design meets or exceeds all of these goals. Recently upgraded VLSI is available, and makes possible a performance enhancement to 11 MIPS and 9 MFLOPS per processor with reduced power consumption. Design tradeoffs and example applications are presented.