• A NEW 1553 ALL-BUS INSTRUMENTATION MONITOR

      Berdugo, Albert; Ricker, William G.; Aydin Vector Division (International Foundation for Telemetering, 1990-11)
      Increased data throughput demands in military and avionics systems has led to the development of an advanced, All-Bus MIL-STD-1553 Instrumentation Monitor. This paper discusses an airborne unit which acquires the information from up to 8 dual-redundant buses, and formats the data for telemetry, recording or real-time analysis according to the requirements of IRIG-106-86, Chapter 8. The ALBUS-1553 acquires all or selected 1553 messages which are formatted into IRIG-compatible serial data stream outputs. Data is time tagged to microsecond resolution. The unit selectively transmits entire or partial 1553 messages under program control. This results in reduced transmission bandwidth if prior knowledge of 1553 traffic is known. The ALBUS also encodes analog voice inputs, discrete userword inputs and multiplexed analog (overhead) inputs. The unit is provided in a ruggedized airborne housing utilizing standard ATR packaging,
    • A NEW DATA PROCESSING TECHNIQUE OF PPM/PPK WITHOUT THE REFERENCE PULSE

      Xi-Hua, Li; Xinan Electronic Engineering Institute, China (International Foundation for Telemetering, 1990-11)
      This paper describes the technical principle that signals conversion, data-processing and data storage are directly carried out without filling up with the reference pulse for PPM and PPK (pulse position keying). By means of analysis for typical frame structure of PPM/PPK signals, a variety of math models of signal time relationship of the system were found, and based on this, a engineering way and a principle block diagram for signals conversion, data processing and data storage were given out.
    • NEW DEVELOPMENT OF OPTIMUM GROUP SYNCHRONIZATION CODES

      Qiu-Cheng, Xie; Zhong-Kui, Lei; Nanjing Aeronautical Institute, Nanjing, China (International Foundation for Telemetering, 1990-11)
      In this paper, twenty-four optimum group synchronization codes (N=31 to 54) for PCM telemetry systems are presented. These optimum codes are the newest development at the category of optimum group synchronization codes up to now in the world.
    • A NEW EXTENDED BANDWIDTH ESCAN L-BAND & S-BAND TRACKING ANTENNA

      COOK, JAMES H., JR.; KOSTER, A. RENEE; SCIENTIFIC-ATLANTA, INC. (International Foundation for Telemetering, 1990-11)
      The design and performance of a 1435 MHZ to 2600 MHZ ESCAN1 feed will be discussed. The radiation characteristics of a very small (<10 wavelengths) reflector antenna will be presented. The ESCAN tracking concept offers a significant improvement in the effective gain, sidelobes and tracking performance for broadband telemetry trackers over previous, low-cost approaches. The tradeoffs associated with the optimization of the ESCAN antenna’s radiation performance will be presented along with a comparison of conical scan and single channel monopulse performance. The tradeoffs will include an analysis of the limitations in performance due to central blockage, aperture illumination, spillover, and coma effects of an “effective” off-axis feed for a small, paraboloidal reflector antenna.
    • THE NEW GENERATION OF COMPACT, FLEXIBLE, ANTENNA CONTROLLERS

      McGiven, Fred A.; TIW Systems Inc. (International Foundation for Telemetering, 1990-11)
      TIW Systems has developed a modern, compact, modular, antenna controller (ACU) for telemetry, tracking, and communications antennas. The controller combines the functions of an antenna control unit, a position conversion/display chassis, and a polarization control unit. By using plug-in cards, a tracking receiver, autophasing control unit, tracking synthesizer, and other functions can be added. Depending on the requirements, the tracking receiver can be a simple wide-band steptrack receiver, or can be a full function phase-locked-loop (PLL) autotrack receiver. In the past, all this capability would have taken a large portion of an entire equipment rack. The unit uses modern microprocessor technology for digitally controlling the position and rate of the antenna. Advanced tracking modes and remote control can be added by connecting an external computer (PTIC) to one of the ACU’s serial ports. The PTIC also provides a user friendly operator interface through the use of high resolution color graphics and easy to understand menus.
    • A New Method for Refinning Orbit of CPS Satellite Using Phase Measurement

      Sheng, Liu Dong; Beijing Institute of Satellite (International Foundation for Telemetering, 1990-11)
      This paper developed a new method of refinning GPS satellite orbit using phase measurement without knowing the GPS codes. Because this approach have no connection with any particular physical model, avoiding introducing any dynamic error, this method make it possible to get high precision GPS satellite orbit. A simulation computation has been conducted and gave an encouraging result.
    • An Object-Oriented Telemetry Format Management (TFM) System

      Li, Tientien; TACT Inc. (International Foundation for Telemetering, 1990-11)
      The telemetry format is a key piece of information utilized by both the flight segment and the ground segment of a mission. During the evolution of a mission, the telemetry format is usually going through many changes and refinements. Sometimes, a format may even evolve from mission to mission. The conventional Relational Data Base Management Systems (RDBMS) do not work well with telemetry formats because of the multidimensional nature of most telemetry formats. To reduce the complexity of managing dynamic telemetry formats, an innovative Telemetry Format Management (TFM) system has been designed. The TFM system utilizes new object-oriented concepts in managing the creation, the evolution, and the utilization of telemetry formats. It supports common telemetry formats including: Time-Division Multiplexed (TDM) telemetry formats and packet telemetry formats. By using the TFM system, one can greatly simplify most tasks associated with the development of telemetry formats. This paper describes the architecture, design concepts, and operational philosophy of the TFM system.
    • ON-BOARD DATA ACQUISITION SYSTEM FOR EMBRAER’S CBA123

      Penna, Sergio Duarte; EMBRAER - Flight Test Division (International Foundation for Telemetering, 1990-11)
      The 90’s will be a challenge to many industries, but in particular to airframe manufacturers like EMBRAER that wish to grow up on a solid basis not only for this decade, but also for the next one. This paper describes the requirements of the on-board data acquisition system and alternatives proposed for the EMBRAER’s new 19-seat, twin engine turbo prop commuter aircraft, the CBA-123.
    • Onboard Television Transmission from A Supersonic Vehicle

      Rose, Robert P.; Naval Weapons Center, China Lake, California (International Foundation for Telemetering, 1990-11)
      A telemetry system designed to photograph and transmit views of a working recovery system. The system utilizes a 5-inch diameter vehicle fitted with a 1/1000-second electronically shuttered video camera and a wideband telemetry transmitter with a pulse code modulation [PCM] signal sent via a second radio frequency [RF] channel.
    • OPEN SYSTEMS FOR TIME-CRITICAL APPLICATIONS IN TELEMETRY

      Furht, Borko; Joseph, David; Gluch, David; Parker, John; Modular Computer Systems, Inc., an AEG company (International Foundation for Telemetering, 1990-11)
      In this paper we discuss the next generation of open real-time systems for time critical applications in telemetry. Traditionally, real-time computing has been a realm of proprietary systems, with real-time applications written in assembly language. With the escalating cost of software development and the need for porting real-time applications to state-of-the-art hardware without massive conversion efforts, there is a need for real-time applications to be portable so that they can be moved to newer hardware platforms easily. Therefore, the next generation of real-time systems will be based on open systems incorporating industry standards, which will reduce system cost and time to market, increase availability of software packages, increase ease-of-use, and facilitate system integration. The open real-time system strategy, presented in this paper, is based on hardware architectures using off-the-shelf microprocessors, Motorola 680X0 and 88X00 families, and the REAL/IX operating system, a fully preemptive real-time UNIX operating system, developed by MODCOMP.
    • Optical Communication in Space A Challenge to Microwave Links

      Mayer, Gerhard; Franz, Jürgen; Applied Data Systems Division; Institute for Communication Technologies (International Foundation for Telemetering, 1990-11)
      Laser communications offer a viable alternative to microwave communications for intersatellite and interplanetary links. Main characteristics are higher data rates, small size antenna telescopes with narrow beamwidths, but the drawback of the necessity for complex pointing, acquisition and tracking systems. After a review of some important technology aspects and modulation / detection schemes the optospecific link parameters axe discussed. An experimental coherent optical system set-up at DLR is described.
    • AN ORGANIZED APPROACH TO HARDWARE DIAGNOSTIC DESIGN

      Murphy, Frank; Aydin Computer and Monitor Division (International Foundation for Telemetering, 1990-11)
      The built-in diagnostic test has taken on an increased role as a maintenance tool in today’s complex electronic systems. While the ultimate diagnostic would exercise all of the major functions in a system and instantly isolate and identify any fault down to the specific part, many practical problems stand in the way. Using the diagnostic facility installed in a recent frame synchronizer/decommutator for the Jet Propulsion Laboratory (JPL) in Pasadena, the author attempts to show the logical approach, considerations, and compromises necessary to design the best possible diagnostic routine in a telemetry processor.
    • 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.