• Rocket Trajectory Analysis from Telemetered Acceleration and Attitude Data

      Cooper, Oscar L.; Research Foundation, Oklahoma State University (International Foundation for Telemetering, 1965-05)
      Double integration of the longitudinal acceleration of a sounding rocket is useful as a simple means of determining its trajectory. Reasonably accurate altitude calculations can be made by this method except when surface winds alter the launch angle of the rocket. Surface wind velocity corrections can be introduced to correct velocity and position information in the horizontal direction, but accurate wind correction data is difficult to obtain for all rockets. A special solar aspect sensor was designed to be used with a commercially available magnetic aspect sensor for rocket attitude determination. This attitude data allows the longitudinal acceleration to be broken more accurately into three vector components. A feasibility study of the aspect system was made using three Aerobee-150 rockets. A digital computer trajectory program was written to utilize aspect and acceleration data for trajectory analysis. It is evident that rocket attitude data is a useful supplement to the longitudinal acceleration data for trajectory determination. More accurate magnetic aspect data is necessary, however, to refine the longitudinal acceleration technique.
    • High "G" UHF Telemetry for Gun-Launched Sounding Probes

      Cruickshank, William J.; Ballistic Research Laboratories (International Foundation for Telemetering, 1965-05)
      The development of a UHF telemetry system that will withstand the high shock (50,000 g) of gun launched vertical sounding probes is described. The associated development of a ground based automatic angle and range tracking and receiving system using a modified AN/GMD-1A Rawin set is also presented.
    • A Solid-State Microwave Relay System

      Beanland, Charles J.; Microwave Associates, Inc. (International Foundation for Telemetering, 1965-05)
      The paper outlines the design parameters and system performance of a solid-state microwave relay equipment. The design is suitable for the transmission of television signals, multichannel telephony and wideband data information. Circuit techniques are described and illustrative numbers quoted for an equipment operating in the 2 KMc/s microwave relay band.
    • TELTRAC, A Telemetry Tracking Acquisition Aid System

      Knowlton, Orin H., Jr.; Canoga Electronics Corporation (International Foundation for Telemetering, 1965-05)
      TELTRAC, A Telemetry Tracking Acquisition Aid System, was manufactured by Canoga Electronics Corporation for the National Aeronautics and Space Administration to augment and update the Project Mercury systems for Project Gemini. In addition, many of the components of the TELTRAC System have been supplied to retrofit and upgrade the original Project Mercury systems. The features of the TELTRAC System that are new in comparison to previously existing Telemetry Trackers are the TELAR II Antenna and the Model 3403 Receiver, which employs both cross-correlation and phase-lock techniques. The TELTRAC System design criteria and a system error analysis, with particular emphasis on multipath errors, are discussed in this article. The detailed design of the TELTRAC System, as well as its subsystems, is also presented.
    • A Dual Polarized, High-Power Synthetic Conical Scan Tracking System

      Chadwick, George G.; Homola, James A.; Hansen, Marvin E.; Radiation Systems, Inc. (International Foundation for Telemetering, 1965-05)
      The dual polarized high-power synthetic conical scan tracking system was designed for operation over the frequency range from 1700 to 2400 mc. This feed was developed for an existing 33' parabolic reflector which is presently located at the Floyd Test Site in Rome, New York. The feed network is located at the focal point of a parabolic dish and is fabricated in WR-430 waveguide. The system provides a horizontally polarized on-axis beam for transmission. It also provides two conically scanning receiving beams at a frequency different from the transmit frequency. One of the receiving beams is vertically polarized; the other is designed to receive the orthogonal horizontal polarization. The conical scan is synthetically generated and individual channel control is provided to allow the two receiving beams to be aligned. The feed system may be converted to provide monopulse outputs by simply removing the synthetic conical scanning mechanism.
    • A Radiation Hardened L-Band Telemetry Transmitter

      Butler, Dan M.; Ling-Temco-Vought, Inc. (International Foundation for Telemetering, 1965-05)
      The advent of requirements for nuclear radiation hardened telemetering components is accompanied by numerous technological problems. Future vehicles may impose severe environmental problems on a telemetering transmitter, as well as the need for relatively high r. f. power output. This paper describes the development of a nuclear radiation hardened telemetry transmitter, designed for operation in the 1435-1535 MC/S band at a nominal 100 W average R.F. power. The development phases covered in the paper consist of (1) design and radiation test of three low power transmitter exciters, (2) design and test of three transmitters, including the 100 W power amplifier and circuit modifications as dictated by radiation test, and (3) change in selection of the final R. F. tube. The paper includes a description of the resultant developmental transmitter, some comments on the major radiation effects problems, and some of the considerations in the radiation test of the transmitter. The author concludes with current status remarks.
    • Miniature Telemetry Transmitter

      Wiley, J. R.; Busch, W.; Langan, L.; M.C.D. General Electric Company (International Foundation for Telemetering, 1965-05)
      The increased use of L and S-Band for telemetry services in conjunction with the need for miniaturized equipment, points up the desirability for compact transmitter units. This report describes a miniature S-Band transmitter and its associated power supply. The design goals are presented together with a discussion of the technical approach used to meet the severe requirements. Illustrations and performance data are included for completeness.
    • Five Basic Methods for the Generation of Binary Cyclic Codes

      Brothman, A.; Brothman, E. H.; Halpern, S. J.; Horowitz, L. M.; Miller, A. H. (International Foundation for Telemetering, 1965-05)
    • Receiver Noise Factor

      Hildner, Ernest G.; National Bureau of Standards (International Foundation for Telemetering, 1965-05)
      The Institute of Radio Engineers definition of receiver noise factor is reviewed and adopted for this paper. The definition’s implications are explored. CW-and dispersed-signal source measurement techniques are discussed and the mathematical base for each method is displayed. The quantities which must be measured in each method are pointed out with the respective advantages and disadvantages. It is concluded that the dispersed-signal source measurement technique is simpler than the CW-signal source techniques considered in this paper.
    • A Six-Channel Physiological Telemetering System

      Robrock, R. B., II; Ko, W. H.; Case Institute of Technology (International Foundation for Telemetering, 1965-05)
      A six channel FM/FM physiological telemetering system was designed to measure two surface temperatures, an internal temperature, the respiration rate, and position and muscle spasm of a paralyzed patient. Tunnel diode subcarrier oscillators operating from a constant-current source provided excellent temperature and long term stability while permitting a complete transmission package with size 0.6" x 2.5" x 2.5" and weight 15 gm. A compatible transistorized receiving system was also constructed.
    • An Operational Test Instrument for PCM Bit Synchronizers/Signal Conditioners

      Cumings, R. G.; Davies, R. A.; Defense Electronics, Inc. (International Foundation for Telemetering, 1965-05)
      The application for a device which will effectively test a PCM bit synchronizer/signal conditioner is described. The general requirements for a bit synchronizer analyzer are listed and some of the problems in implementing these requirements are discussed, including some problems relating to PCM signal conditioners. A description of an instrument capable of performing the required measurements is given.
    • A New Approach to Solid-State Communicator Design

      Schoenwetter, H. K.; General Devices, Inc. (International Foundation for Telemetering, 1965-05)
      An electronic commutator is described which employs only two types of modules and is expandable one channel at a time. Either high or low level commutators can be constructed. Data input circuits are completely isolated from gating voltages. Power per channel is 10 milliwatts; volume, 0.4 cubic inch. Commutator modules are suitable for air/spacecraft environments.
    • The Operational Pre-D for the Atlantis Missile Range

      Shollenberger, George D.; Defense Electronics, Inc. (International Foundation for Telemetering, 1965-05)
      This newly-developed receiving and predetection recording system currently being integrated into the Atlantic Missile Range should prove of considerable interest to the telemetry systems engineer. The system, designated TRKI-12, will become part of the familiar "Range Rehabilitation Program." The TRKI-12 is capable of handling up to twelve simultaneous telemetry signals of any known or projected telemetry format. Frequency-translation methods used enable recording and reproduction of high bit-rate PCM and other wide-bandwidth signals with minimum distortion. A wideband FM recording method gives true DC to 500-kc bandwidth recordings. The system incorporates a diversity reception and combining concept enabling optimum combination of telemetry data from diversity antenna systems without undesirable byproducts or need for special phase-correction. The description herein, which includes design constraints and limitations for a system of this type, should yield information of concern to the range user and should be especially useful in establishing efficient and economical range interfaces.
    • Application of a Digital Computer to Real-Time Telemetry Systems

      Reinen, Gerald; Cox, Fred B.; Beckman Instruments (International Foundation for Telemetering, 1965-05)
    • Two-Way Telemetry for Hospital Use

      Johnston, E. B.; I.T.T. Federal Labs (International Foundation for Telemetering, 1965-05)
      A radio telemetry system for transmitting physiological data from a patient is used in a receiver complex to locate the patient. Methods of stimulating the patient for research or remedial control are discussed.
    • An Adaptable Spacecraft Telemetry System

      Maxwell, Marvin S.; Silverman, Joseph R.; Czarcinski, Eugene A.; Goddard Space Flight Center (International Foundation for Telemetering, 1965-05)
      Because of the limitations of hardwired telemetry systems, existing spacecraft are denied the capability of revising their sampling structure, their sampling rates, or the experiments and/or test points to be sampled. A centralized system to provide these capabilities is described in this paper. This system is called the Flexible Automatic Computer Telemetry System (FACTS). As initially conceived, the FACTS, through the use of a stored program, will be able to sample a large number of channels with great flexibility in sampling rates, sampling structure and the selection of experiments and/or test points. This paper outlines the basic spacecraft and ground station system and illustrates the flexibility which can be achieved with it. Selected diagrams are given along with a description of the operation of the various units in the system.
    • Flutter and Time Errors in Magnetic Data Recorders

      Chao, S. C.; Ampex Corporation (International Foundation for Telemetering, 1965-05)
      Flutter and time errors are critical factors in all instrumentation recording. They become even more so in many current and future applications, especially in the data recovery and reduction processes of various telemetering systems. This paper presents analytically the relationship between flutter, time base error, and time base error difference (sometimes called jitter), plus the effects of these errors on direct and FM recording. Methods of measuring these quantities are discussed and experimental examples are given. Spectral and probability density analyses and measurements have indicated that these variables are basically random in nature, and as such, they should be specified in terms of a levels, rather than in conventional peak-to-peak figures. Finally, a measurement method for the typical values of interchannel time error is presented, and some trends of correlation among all channels are discussed.
    • Communications from a Mars Entry Probe

      Turner, Lester; Scientific Data Systems, Inc. (International Foundation for Telemetering, 1965-05)
      A low risk experiment to determine the principal properties (density, pressure, temperature) of the Martian atmosphere has been studied. A. slender conical capsule is ejected from the Mars fly-by or orbiting spacecraft and enters the planet’s atmosphere. Theoretical and experimental data support the concept of continuous communication between the sharp cone capsule entering the Martian atmosphere and the spacecraft. The communications system basically consists of a 25 watt transmitter phase modulating a 100 mc carrier on the entry capsule and a wideband receiver on the spacecraft. Transmitting power and spacecraft data storage considerations resulted in a data transmission rate of 147 bits per second in a pulse code modulated format.
    • A Meteor Burst Telemetry System for a Nuclear Lunar Power Plant

      Swisher, B. F.; Johnson, R. E.; Boeing Company (International Foundation for Telemetering, 1965-05)
      The meteor burst telemetry system to be described was conceived, designed, and developed as an Engineering Model. The telemetry system will be used to telemeter oceanographic data from an experimental instrumented ocean buoy to be moored at continental shelf depths on Cobb Seamount to shore facilities at Seattle, Washington. Cobb Seamount is located in the Pacific Ocean approximately 300 miles off the coast of the State of Washington. A general description of the telemetry system and its operational characteristics, which are dictated by the statistical characteristics of the meteor burst mode of propagation, is presented. This is followed by a more detailed description of equipment elements of the system. The developmental status, the results of a propagation path field test, and plans for additional tests are discussed. Development results to date are sufficiently encouraging to generate confidence in the utility of a meteor burst telemetry system for oceanographic data acquisition.
    • Frequency Modulation Error Calculation

      Nyre, Donald L.; Douglas Aircraft Company (International Foundation for Telemetering, 1965-05)
      In a frequency modulation process, small amplitude sidebands near the deviation limits are sometimes distorted or lost. The problems and expense of preserving these lessor sidebands are often great, and spectrum space must be reserved for them. To date there appears to have been no clear statement of their importance in terms of data accuracy. This paper presents a numerical calculation of the errors accrued in a demodulated signal after truncation of the FM spectrum obtained with sinusoidal modulation. It is shown that the error increases for decreasing bandwidth. Error is evaluated for several bandwidths, and relationships to power outside the band are noted. Applications include specification of bandwidth for a given error in demodulated signal. The use of a limiter is assumed.