Stetten, George; Koontz, Fred; Sheppard, Christine; Koontz, Charles; New York Zoological Society (International Foundation for Telemetering, 1990-11)
      A series of artificial eggs has been developed for the New York Zoological Society to measure conditions in the nest of the white-naped crane (Grus Vipio). Investigations undertaken at the Bronx Zoo have endeavored to improve artificial incubation of the eggs of endangered species of birds. Artificial eggs were constructed and camouflaged so that a pair of birds would accept and incubate them. Inside each counterfeit egg, a radio telemetry transmitter was hidden to report on the temperature and humidity in the nest and the orientation of the egg itself with respect to gravity.
    • Telemetry Antenna Patterns for Single and Multi-Element Arrays

      Rieger, James L.; Naval Weapons Center, China Lake, California (International Foundation for Telemetering, 1990-11)
      The use of multiple antennas (or multiport) antennas for vehicular telemetry causes patterns to result which are unknown and not well understood by the telemetry designer. When the antenna ports are separated by distances of more than a half wavelength, the resulting patterns are rarely what was intended. The antenna plotting program, an extension of a earlier University of Utah antenna plotting routine, allows rapid creation of patterns for up to 30 (or more) antennas of like polarization displaced from each other in all three axes. Single-port antennas are modeled as compound antennas to produce the observed pattern, and combinations of these single-port antennas are then plotted. Case studies are shown for an aircraft and a missile body.

      Strock, O. J. (Jud); Witchey, Michael (Mike); Loral Data Systems (International Foundation for Telemetering, 1990-11)
      This paper responds to a test range engineer’s need to relay one or more channels of various types of telemetry data from a remotely-located receiving station to the central telemetry station at range headquarters for real time processing and display. Several types of data are identified, and specific equipment and technology for multiplexing, transmission, and demultiplexing up to eight streams from a variety of sources is discussed. The widely-used T3 communications link, also known as DS-3, can relay data via satellite, microwave link, or other high-speed path at 44.736 megabits per second, of which about 95% can be actual telemetry data; other standard links operate at lower aggregate rates. Several links and rates are discussed, with emphasis in the high-rate T3 link.
    • Telemetry Format Compiler for the Generation of State machine Code Executed by a PCX Encoder

      Landry, Michael; Loral Conic (International Foundation for Telemetering, 1990-11)
      Telemetry encoders commonly use programmable memory devices for the storage of data used to control the multiplexed output format. The manual generation of this program control information is tedious and error prone. A telemetry format compiler has been developed to automate this process. A high level definition of the format information is processed to result in a binary object file which is programmed into the memory of the encoder and executed by the state machine controlling the encoding.
    • Telemetry Ground Station Data Servers for Real-Time Expert Systems

      Silagi, Randall L.; Friedman, Paul J.; Loral Instrumentation (International Foundation for Telemetering, 1990-11)
      Expert systems can be of great benefit to analysts, mission controllers, and flight safety officers who must make real-time decisions based upon a myriad of quickly changing parameters. Operators may require extensive training to view a limited parameter set or they can be aided by computers systematically monitoring many parameters. But, even today’s powerful general purpose computers and workstations are limited in their capabilities to monitor (i.e., process) the desired number of parameters. Thus, applications are distributed across multiple platforms. A telemetry ground station front end system (i.e., a real-time data server) that distributes preprocessed data to multiple knowledge stations over standard communications networks is presented.

      Perry, Ross; Kelly, Fred; Brimbal, Michel; Computer Sciences Corp.; Gould Inc. (International Foundation for Telemetering, 1990-11)
      The Telemetry Integrated Processing System (TIPS) at the U.S. Air Force Western Space and Missile Center (WSMC), Vandenberg AFB, California is a large scale, computer based, telemetry processing and display system installed in the early 80’s. The digital printer/plotters used in the Quick Look Display Area (QLDA) were installed in 1979 and their maintenance support has become critical. Their replacement is now necessary. This paper will present the approach used to solve the replacement of these printer/plotters by off-the shelf commercial equipment. The key objectives of providing users with a similar display output and strict hardware and software compatibility with existing system have been met. In addition, the new equipment installed can meet the display requirements of future developments or upgrades of the TIPS.

      Thom, Gary A.; Aydin Computer and Monitor Division (International Foundation for Telemetering, 1990-11)
      Today there are a number of equipment vendors offering modular, bus oriented Telemetry Preprocessor systems. The architecture of these systems varies greatly as does the actual performance. This paper discusses a method for specifying and evaluating Telemetry Preprocessor performance independent of the architectural implementation.
    • 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.

      Daqing, Huang; Qiu-Cheng, Xie; Nanjing Aeronautical Institute (International Foundation for Telemetering, 1990-11)
      In this Paper, the time-assisting code techique capable of defeating the repeat jamming is presented. The construction and antijamming performance of this technique are described and analyzed. This technique not only is robust to repeat jamming of Remote Control/Telemetring and Communication Systems, but also is used in multi-address remote control/ telemetring, multi-address communication and radar systems.

      Reed, Gary; DeVries, James; Computer Sciences Corporation; Pacific Missile Test Center (International Foundation for Telemetering, 1990-11)
      The procurement of a new or upgraded data processing system doesn’t have to take eons of time and result in a less than adequate system. The complexity of requirements definition and system development are not getting any easier, but well-defined methodologies and the use of proven capabilities are providing a means of controlling the process. Even though there are more and more demands being placed on telemetry processing systems and advancing technology offers a myriad of solutions from which to choose, the Government and contractor communities are becoming more effective in applying techniques to define and deliver adequate systems. One method of demonstrating this is to describe an example of a complex telemetry processing system currently being developed for the Navy.
    • Twenty-First Century Telemetry

      Montano, William G.; Rice, William A.; White Sands Missile Range, New Mexico (International Foundation for Telemetering, 1990-11)
      This paper addresses several areas of Telemetry instrumentation for the future. The possible 21st Century data formats and using the means made possible by technological advances to receive, record, and process telemetry data will be discussed. We will review the past, present and future systems and the changes to expect in the areas of Higher Data Rates, Greater RF Bandwidths, Multiple Object Test Scenarios, Telemetry Multiplex, Digital Microwave Radio Links, Lightwave Fiber Systems, Optical Disc Telemetry Data Recording, Data Security, and Global Telemetry via Satellite.
    • 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.
    • The Unix Operating System for Telemetry Applications

      Pfeiffer, Joseph J., Jr.; New Mexico State University (International Foundation for Telemetering, 1990-11)
      UNIX† is a very popular operating system, in use on a wide variety of hardware platforms, in a wide variety of environments, for a wide variety of problems. It has certain well-known deficiencies, however, for time-critical applications where guaranteed response time is required. This paper considers the use of Unix and related systems for telemetry applications. Of particular interest will be Unix as a possible operating system for NASA’s Data Handling Service.

      Rosenthal, Glenn; Salley, Thomas; Metraplex Corporation (International Foundation for Telemetering, 1990-11)
      The Fast Fourier Transform (FFT) converts digitally sampled time domain data into the frequency domain. This paper will provide an advanced introduction for the telemetry engineer to basic FFT theory and then present and explain the different user preprocessing options that are available when using the FFT. These options include: using windowing functions, “zero filling” for frequency data interpolation, and setting the frequency resolution of the FFT resultant spectrum,