• A Miniaturized RF Acceleration Measuring System

      Trapp, D. L.; Sandia Corporation (International Foundation for Telemetering, 1966-10)
      This paper will describe the design and development of a miniaturized high-shock package utilizing an FM modulated 19.8 mc transmitter and a piezoresistive accelerometer. This program was initiated in October 1965 for the purpose of measuring deceleration profiles generated by small diameter (1-1/4 inch) vehicles that penetrate targets of known composition with input velocities up to 1500 feet per second. Shock levels were anticipated to be in the 0 - 10,000 g range, with rise times varying as a function of projectile ogives and anticipated to be as fast as 100 μsec. The system was designed to an existing volume described by a right circular cylinder, 1 inch in diameter by 6 inches in length, and an allowable volume of 3/4-inch diameter by 4-inches long was allocated for the 19.8 mc transmitting antenna. The first operational usage of this system was in late January 1966.
    • Computer Controlled Telemetry Station

      Strock, O. J.; Defense Electronics, Inc. (International Foundation for Telemetering, 1966-10)
      A telemetry ground station under complete operational control of a general-purpose digital computer is described. The six subsystems which comprise the station are examined in some detail to show the method of control and the flexibility and speed of operation. A specific application is described and other potential applications are explored.
    • Surveyor Spacecraft Telecommunications

      Rickman, Frank; Kirsten, Charles; Hughes Aircraft Company; Jet Propulsion Laboratory (International Foundation for Telemetering, 1966-10)
      Although the Surveyor program is five years old, very little concerning the on-board telecommunications has been recently printed. Because much interest has been stimulated by the recent very successful Surveyor I mission, it is believed that this descriptive article of the Surveyor telecommunications system will be of general interest. The paper is oriented toward actual subsystem implementation and performance, rather than the purely analytical presentation. The reliability and flexibility of the telecommunications is detailed with some attention being given to the operational redundancy and variety of data transmission modes available. A few of the major difficulties experienced during the design and qualifications of the telecommunications equipment are touched upon, with commentary on the solutions finally used. Pertinent mission data is discussed, with a brief presentation of some telemetered AGC: signals. Finally, a summary of the experiments run on the telecommunications subsystem, both in-flight and on the lunar surface, are presented. These experiments included a deliberate in-flight increase in the data rate above the analytically predicted level for an acceptable bit error rate, a mapping of the planar array antenna gain while on the lunar surface, voice transmission via the Surveyor transponder, and subsystem performance assessments. This paper presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under Contract No. NAS7-100, sponsored by the National Aeronautics and Space Administration.
    • Requirement for a Data Quality Assurance Program

      Nichols, M. H. (International Foundation for Telemetering, 1966-10)
      The requirement for a Data Quality Assurance Program for telemetry ground station operations is outlined. Examples are given for frequency division and time division formats to demonstrate that a practical and meaningful program is within the state-of-the-art and in fact that the basic modules have already been developed for commercial communication systems. A program is recommended for expansion of the IRIG Standards to include performance criteria and specifications of end-to-end ground station tests for determining that the criteria are satisfied for each mission.
    • Magnetic Recording of Radar Data

      Young, Ronald E.; Ampex Corporation (International Foundation for Telemetering, 1966-10)
      The methods presently utilized for magnetic recording of radar data are explained with reference to basic radar types. The PPI radar has a time continuous video signal and generally requires a transient free recorder of moderate data bandwidth. In addition, means must be provided to record the azimuth information in either synchro, sine-cosine or digital form. Such means are available and recommended approaches for each type of data are given. Time discontinuous radar such as the missile tracking monopulse group may utilize recorders normally designed for video service if certain pulse spacing criteria are observed. The wider data bandwidth of this type of signal makes the use of rotary head recorders mandatory. There are many applications for radar recording. Some of those described include operator training, debriefing and scoring and operational evaluation of the radar facility. The radar recorder can be a significant aid in data analysis for signature determination of satellites and planetary mapping. The radar recorder also furnishes a close facsimile of the operating radar signal for system evaluation when there are no targets to observe or when the main radar is shut down for any reason. As an illustration of the application of magnetic recording to the radar system an airborne data acquisition recorder is described along with a companion ground reproducer. These two units are presently in use in the evaluation of an airborne radar system and offer significant advantages over previously available recording equipment. The development of time base stable magnetic tape recorders capable of handling data bandwidth in excess of 5 MHz has added another facet to the instrumentation field - that of recording radar data on a real time basis for analysis at a later time. The discussion that follows illustrates the methods used in magnetic recording of radar data and cites a typical recording system.
    • Telemetry System Design for Saturn Vehicles

      Frost, W. O.; Norvell, D. E.; Marshall Space Flight Center; The Boeing Company (International Foundation for Telemetering, 1966-10)
      This paper discusses the data system requirements for large space vehicles and describes a flexible telemetry system design which is used on all stages of the Saturn IB and Saturn V vehicles. The basic vehicle telemetry design provides standard assembly building blocks forming a versatile catalogue of parts from which a stage telemetry subsystem may be assembled to meet almost any conceivable monitoring requirement. In addition to its inflight monitoring function, the telemetry subsystem also provides real time data acquisition for automatic vehicle checkout.
    • The Apollo Launch Data System

      Quinn, M. J.; Nasa Manned Spacecraft Center (International Foundation for Telemetering, 1966-10)
      The development of the Apollo Launch Data Telemetry System, the real-time interface between the Merritt Island Launch Area (MILA) and the Mission Control Center-Houston (MCC-H), is reviewed from its beginning through the system planning stages, and then into the final hardware implementation.
    • A Compatible Double Sideband/Single Sideband/Constant Bandwidth FM Telemetry System for Wideband Data

      Frost, W. O.; Emens, F. H.; Williams, R.; Marshall Space Flight Center (International Foundation for Telemetering, 1966-10)
      This paper reviews the telemetry problems involved in transmission of wideband phenomena such as shock, vibration, and acoustic measurements. Three approaches to this problem have recently received considerable attention from the telemetry community: SS/FM, DSB/FM, and constant bandwidth FM/FM. The relative capabilities and limitations of these three techniques are discussed and their S/N performance and r-f bandwidth utilization efficiency are compared. An arrangement whereby the three techniques may be flexibly intermixed on a single RF carrier is then described. Examination and consideration of the merits of this arrangement as a future standard telemetry technique is proposed.
    • Factors Limiting UHF Telemetry Systems Operation

      Gong, H.; Herman, R. T.; Konop, P. L.; The Mitre Corporation (International Foundation for Telemetering, 1966-10)
      Demands on the use of that portion of the radio spectrum from 225 MHz to 400 MHz for military tactical operations have made it necessary to vacate the VHF telemetry band from 215 MHz to 260 MHz by I January 1970 and to convert such operations to UHF telemetry bands from 1435 MHz to 1540 MHz and 2200 MHz to 2300 MHz. The environmental, physical, and practical limitations imposed on telemetry system performance when operation is moved from VHF to UHF are described in this paper. The topics which are discussed include path loss, multipath, flame plasma effects, expected Doppler shift and Doppler rates, natural noise limitation, UHF transmitter power and stability, receiving system noise figures, airborne antennas and ground antennas. UHF telemetry operation in support of missions for aircraft, ballistic, orbital, and deep-space vehicles is evaluated mainly through a comparison with similar operations at VHF. The results of this study show that there are no technological factors which limit the instrumentation of an adequate UHF conversion.
    • A Report on the Application of Data Abbreviation on Actual Range Telemetry Data

      Maestre, N. E.; Radio Corporation of America (International Foundation for Telemetering, 1966-10)
      The growing interest in the practical applications of data abbreviation and compaction to efficiently handle large quantities of significant information have led to numerous investigations and studies of this discipline. Although there is great potential in both the airborne and ground applications, it is primarily the latter that led RCA to initial independent data abbreviation and compaction studies. It is the purpose of this report to present results of the practical application of data abbreviation to actual telemetry data recorded on magnetic tapes. The presentation will include the affects of routine parameters, the amount of redundancy information removal, and, the reduction in processing time and recording facilities. Even though these studies involved the use of telemetry data from a mission that has already occurred, the need for the inclusion of data abbreviation devices into the existing ranges to process data in real time is becoming more apparent.
    • White Sands Missile Range Modernization

      Boone, Billy B.; White Sands Missile Range (International Foundation for Telemetering, 1966-10)
    • Refinements on Analysis of PCM Synchronization

      Williard, Merwin W.; Symetrics Engineering (International Foundation for Telemetering, 1966-10)
      In this paper, the author reconsiders some of his previously reported assumptions on an analysis of mean time to establish PCM synchronization, and he provides further insight into the effect of specific synchronization patterns and parameters of the synchronization process. An improvements in one assumption shows how the analysis can provide slightly more accurate results. Specific recommendations are made for standardization of PCM sync patterns.
    • Solid State Microwave Power Generation

      Brounley, Richard W.; Electronic Communications, Inc. (International Foundation for Telemetering, 1966-10)
    • Evaluation of Redundancy Reduction Algorithms

      Simpson, R. S.; University of Alabama (International Foundation for Telemetering, 1966-10)
    • Transistor-Magnetic Logic in Aerospace Timing

      Goldman, Samuel C.; Stern, Michael M.; Goldman, David J.; Di/An Controls, Inc. (International Foundation for Telemetering, 1966-10)
    • Microsecond Resolution Telemetry

      Moore, Jerry D.; Sandia Corporation (International Foundation for Telemetering, 1966-10)