• Tape Certification Today and in The Future

      O'Sullivan, Tony; Book, Harold; BOW Industries, Inc. (International Foundation for Telemetering, 1988-10)
      The advent of high density digital recording has required the development of sophisticated tape certification equipment which allows the user to test tape for dropouts at his actual system bit packing density and to clean and program wind tapes with the same equipment. By using two sets of reproduce heads with dual threshold and duration controls tapes can be graded as to their suitability for use with HDDR systems or far less exacting analog applications.
    • Telemetry Chart Recording Via Direct Digital Link

      Smith, Grant M.; Alexander, James H.; Astro-Med, Inc. (International Foundation for Telemetering, 1988-10)
      Mission safety and cost-efficiency concerns have resulted in a resurgence of interest in real-time strip chart recorders. But conventional recorder technologies require inordinate maintenance and daily calibration. Attempts at strip chart emulation involving costly dedicated microcomputers and CRT's have failed, because the chart itself is not real-time, a basic requirement. The concept of an inexpensive, direct digital link to a telemetry processing computer (VAX, e.g.) is discussed. A thorough examination of real-time monitoring of critical, non-repeatable data is presented. Objectives: An automated, turn-key telemetry data system. Reduce the routine maintenance required by conventional recording systems; eliminate the need for digital-to-analog converters (DAC's); and improve the efficiency of range personnel and the integrity of recorded data.
    • 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.
    • Telemetry Processing - Realtime to Postflight

      Quesenberry, Dave; Reed, Gary; CSC Network Systems Division (International Foundation for Telemetering, 1988-10)
      The Test Support Facility Integrated Flight Data Processing System (TSF IFDAPS) has recently been developed and installed for the Air Force at Edwards AFB. The TSF IFDAPS incorporates a number of new capabilities designed to satisfy today's advanced requirements for high performance and flexible telemetry processing. This paper describes some of the advances accomplished by the TSF IFDAPS.
    • Trends in Telemetry Systems

      Strock, O. J. (Jud); Fairchild Weston Systems, Inc. (International Foundation for Telemetering, 1988-10)
      This tutorial is an examination of trends in telemetry systems as we approach the 1990s. . . a look at where we are, and where we appear to be headed in the near future. Historically, the typical change in our technology is brought about by one of three conditions. First, users demand performance improvements in order to facilitate their analysis of test programs. Second, manufacturers make performance improvements because continuing advances in component technology enable them to offer improved products for telemetry applications. Third, developments in non-telemetry applications, both hardware and software, are adapted to our needs by system designers. We will see the results of all three conditions as we look at trends in telemetry systems.
    • 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.
    • The Use of Databases in Telemetry Processing Systems

      Massing, James E.; Fairchild Weston Systems Inc. (International Foundation for Telemetering, 1988-10)
      The amount of information necessary for a computer to setup and process data through a telemetry system is increasing rapidly, The complexity and number of telemetry formats often requires a variety of front-end setups to be kept in the computer. Also, as hardware preprocessors become more common, there is a need to maintain in the computer all information used to direct real-time processing of individual parameters. The need for storage of those setups and parameter definitions, and rapid retrieval of this information, has led to the use of databases in well-designed telemetry systems.
    • Utilization of Real Time Digital Strip Chart Emulation (RTDSCE) Concepts

      Halsey, Tim; Brimbal, Michel; Grottenthaler, Gary; Gould Incorporated (International Foundation for Telemetering, 1988-10)
      "Real Time Digital Strip Chart Emulation", a paper presented in the 1987 ITC Proceedings is reviewed for continuity and the digital techniques applicable to range data display are expanded upon. The paper seeks to present the process of recording telemetered signals in the RTDSCE data management scheme. Direct hardware interfacing is discussed with emphasis on automation and manpower reduction. Time code display and various mass storage possibilities are explored. The merits of video monitoring and the workstation concept during playback are evaluated.
    • Video Compression Standardization Issues

      Stephens, Charles R.; Premmco (International Foundation for Telemetering, 1988-10)
      This paper discusses the development of a standard for compressed digital video. The benefits and applications of compressed digital video are reviewed, and some examples of compression techniques are presented. A hardware implementation of a differential pulse code modulation approach is examined.
    • 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.
    • VLSI High Speed Packet Processor

      Grebowsky, Gerald J.; Dominy, Carol T.; NASA Goddard Space Flight Center (International Foundation for Telemetering, 1988-10)
      The Goddard Space Flight Center Mission Operations and Data Systems Directorate has developed a Packet Processor card utilizing semi-custom very large scale integration (VLSI) devices, microprocessors, and programmable gate arrays to support the implementation of multi-channel telemetry data capture systems. This card will receive synchronized error corrected telemetry transfer frames and output annotated application packets derived from this data. An adaptable format capability is provided by the programmability of three microprocessors while the throughput capability of the Packet Processor is achieved by a data pipeline consisting of two separate RAM systems controlled by specially designed semi-custom VLSI logic.
    • Wideband High Performance Telemetry Tracking and Data Reception System

      Bedford, Cary C.; TT & C Systems; Datron Systems Incorporated (International Foundation for Telemetering, 1988-10)
      A 5 meter diameter wideband polarization diversity Telemetry Tracking System has been developed for Eglin Air Force Base. A single solid state feed, with no moving parts, provides autotrack and data reception in the 1435-1540 MHz and 2200-2400 MHz bands. The system consists of three tracking antennas, each mounted on separate 75 foot high towers. The antennas feature continuous rotation capability in azimuth and remotely controlled stowing mechanisms. A common console containing test equipment, multicouplers, patch panels, RF switching, boresight source and control equipment is interfaced with the three (3) tracking antennas, receiver combiner systems, and boresite antenna. The complete system features total integration of state-of-the-art feed/RF, tracking, and control system electronics with a highly versatile sub-system of telemetry receivers, combiners, RF, and wideband high level video distribution equipment.