• 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.
    • INTELLIGENT TELEMETRY SIMULATOR FOR SPACE APPLICATIONS

      Blasdel, Arthur N., Jr.; Hartman, Wayne; Ford Aerospace Corporation (International Foundation for Telemetering, 1990-11)
      Ford Aerospace Corporation has been working for several years on Independent Research and Development (IR&D) that brings artificial intelligence technology to bear on space mission operations tasks. During this time, we have developed a flexible and sophisticated tool, called Paragon, that supports knowledge representation in a very intuitive and easy to maintain manner. As a fallout of our knowledge representation approach in Paragon, we get a simulation capability that supports testing and verification of the model. This same capability can be used to support various space operations training and readiness activities (1). Recently, we became aware of the very flexible telemetry generation and display capabilities of the Loral 500 system, and found that we could combine our Paragon modeling and simulation capability with the Loral equipment to create an intelligent telemetry simulator that has the potential to dramatically reduce acquisition, development, installation, and maintenance costs for space system simulation. This paper discusses the features and capabilities of the Paragon/Loral 500 Intelligent Telemetry Simulator (ITS) as well as the prototyping we have accomplished to date.
    • International Telemetering Conference Proceedings, Volume 26 (1990)

      International Foundation for Telemetering, 1990-11
    • 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.
    • UNIX and Real-Time Telemetry

      Querido, Robert; Loral Instrumentation (International Foundation for Telemetering, 1990-11)
      This paper discusses the benefits of using UNIX in a telemetry and satellite control product and some specific features implemented in UNIX-based workstations and file servers. Features discussed include real-time disk archiving and playback using UNIX and single-point-of-failure issues.
    • 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.
    • 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.
    • Antenna Modification for In-Flight Projectile Fuze Data

      Sandberg, Craig D.; US. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (International Foundation for Telemetering, 1990-11)
      Microstrip antenna designs have gained importance due to the requirements and restrictions of projectile size and desired data. Most projectile testing programs require in-flight data during the entire trajectory. Original microstrip antenna designs created extensive variations in the antenna radiation pattern as the projectile was rotated about its axis. These variations led to distortion and total loss of data during critical events of a projectile fuze test. Developments and data that have led to modified designs in order to reduce these nulls will be discussed in the following sections.
    • 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.
    • 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.
    • 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.
    • Modified Instrumentation for Torsional Impulse Projectiles

      PETRELLESE, JOSEPH, JR.; US ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (International Foundation for Telemetering, 1990-11)
      The demand for test projectiles instrumented for gathering in-bore torsional impulse data has been steadily increasing. A test projectile consists of a telemeter, 12 accelerometers, and the remaining necessary hardware. Cost, availability, and survivability of commercial accelerometers being used have become a major concern. In-house testing of a new source and different technology accelerometer show a cost benefit, higher availability and a much higher survivability rate. This paper outlines the recent progress of qualifying a new source and different technology accelerometer, which leads to a modification of the current Torsional Impulse test projectile, along with potential developments to insure a more cost effective, available, and reliable test projectile to be used in future torsional impulse tests.
    • The Error-Correcting Codes of The m-Sequence

      Tingxian, Zhou; LIKUN, HOU; BINGXING, XU; Harbin Institute of Technology (International Foundation for Telemetering, 1990-11)
      The paper analyses the properties of m-sequence error-correcting codes when adapting the correlation detection decoding method, deduces the error-tolerant number formula of binary sequence with a good auto-correlation property being used as error-correcting codes, provides with a method to increase the efficiency of the m-sequence error-correcting codes and make its coding and decoding procedures in the form of framed figures.
    • SUBMINIATURE TELEMETRY TECHNOLOGY

      Keller, G. E., Jr; Air Force Armament Laboratory (AFATL) (International Foundation for Telemetering, 1990-11)
      Current telemetry instrumentation systems are subject to space and weight limitations for use in bombs, dispensers, submunitions, projectiles and other tactical weapon systems. It is not now feasible to instrument submunitions and projectiles for weapon effectiveness data because state-of-the-art telemetry devices cannot be rapidly and cost effectively installed in unmodified munitions. Furthermore, aircraft modifications for flutter/loads testing are extremely expensive and time consuming. This program will develop a low cost telemetry chip-set consisting of integrated sensors, signal conditioning, transmitters and encryptors. “Peel-and-Stick” (See Figure 1) telemetry devices, containing a specific chip-set with integrated sensors, a battery, and antenna in an extremely small package, will also be developed. Subminiature Telemetry Technology (SMT) will directly impact all future tactical submunition development programs during pre-production RDT&E. This program will also support compatibility and safe separation testing done in the Air Force SEEK EAGLE program. Conventional and kinetic energy projectile programs and advanced missile programs will have long-term benefit. Telemetry and encryption designs developed in this program will advance the state-of-the-art in telemetry fabrication from hybrid to monolithic providing smaller, more shock resistant systems at a much lower cost. Subminiature telemetry devices could be integrated with the weapon system during its development allowing for a non-destructive, non-contaminating test of the system. This will greatly reduce the cost and logistics of determining weapon readiness and health status during long time periods of storage.
    • Telemetry Simulation Using Direct Digital Synthesis Techniques

      Pitchford, Randall S.; Frontier Engineering, Inc. (International Foundation for Telemetering, 1990-11)
      Direct digital synthesis technology has been employed in the development of a telemetry data simulator constructed for the Western Space and Missile Center (WSMC). The telemetry simulator, known as TDVS II, is briefly described to provide background; however, the principal subject is related to the development of programmable synthesizer modules employed in the TDVS II system. The programmable synthesizer modules (or PSMs) utilize direct digital synthesizer (DDS) technology to generate a variety of common telemetry signals for simulation output. The internal behavior of DDS devices has been thoroughly examined in the literature for nearly 20 years. The author is aware of significant work in this area by every major aerospace contractor, as well as a broad range of activity by semiconductor developers, and in the universities. The purpose here is to expand awareness of the subject and its basic concepts in support of applications for the telemetry industry. During the TDVS II application development period, new DDS devices have appeared and several advances in device technology (in terms of both speed and technique) have been effected. Many fundamental communications technologies will move into greater capacity and offer new capabilities over the next few years as a direct result of DDS technology. Among these are: cellular telephony, high-definition television and video delivery systems in general, data communications down to the general business facsimile and home modem level, and other communications systems of various types to include telemetry systems. A recent literature search of the topic, limited only to documents available in English, indicates that some 25 articles and dissertations of significance have appeared since 1985, with over 30% of these appearing in international forums (including Germany, Japan, Great Britain, Portugal, Finland...). Product advertisements can readily be found in various publications on test instruments, amateur radio, etc., which indicate that international knowledge and product application of the technology is becoming increasingly widespread.
    • INVESTIGATION OF CHIRP INTERFERENCE ON M-FSK DEMODULATION USING RAC

      Ng, Wai-Hung; Leung, Tony; The Aerospace Corporation (International Foundation for Telemetering, 1990-11)
      Recently, many satellite systems started to employ reflective-array compressor (RAC) to demodulate their M-FSK communication signals. Because the RAC’s time delay varies with the temperature, pilot-tones are usually introduced as the operational reference. In this paper, the basic chirp Fourier transform (CFT) is briefly reviewed. Then, investigation into possible pilot-tone interference caused by various chirp signals with RAC’s dispersive delay properties is presented and discussed.
    • 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.
    • 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.
    • Color Extension for the HORACE TV Compression Protocol

      Gattis, Sherri L.; Rieger, James L.; Naval Weapons Center, China Lake, California (International Foundation for Telemetering, 1990-11)
      The HORACE protocol[5] was designed as a common medium of exchange for digitized black-and-white television images at varying resolutions at bit rates from below 9600 to over 50M bits per second. At the 1 time of the protocol’s creation, “hooks” were added to allow use of the system to transmit and receive two-and three-color images from an NTSC, RGBY, RGB, or “S-type” input and produce outputs in the same format, but those systems remained undefined. Two systems implementing various features of the extended color protocol have been built and demonstrated by two different manufacturers, and an effort to standardize the protocol for all users and manufacturers is underway.
    • A Band-Width Limiting Circuit Improves Telemetry System Operation

      Lillie, Derek S.; LORAL CONIC (International Foundation for Telemetering, 1990-11)
      Present bandwidth limiters use a six-pole bessel filter approach to limit the power bandwidth of the transmitter to IRIG-106-86 requirements. However, the filter must be reconfigured if frequency changes in the data stream are desired for system requirement purposes, eg. adding encryption. The circuits set forth herein will provide for frequency change of the data stream while also providing a power increase by reducing the out of band power.