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Space Electronics and Telemetry, IRE Transactions on

Issue 4 • Date Dec. 1962

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Displaying Results 1 - 11 of 11
  • [Front cover]

    Publication Year: 1962 , Page(s): c1
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  • IRE Professional Group on Space Electronics and Telemetry

    Publication Year: 1962 , Page(s): nil1
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  • [Breaker page]

    Publication Year: 1962 , Page(s): nil1
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  • A Study of the Threshold Power Requirements of FMFB Receivers

    Publication Year: 1962 , Page(s): 249 - 256
    Cited by:  Papers (3)
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    The two-threshold concept of Enloe is systematized by expressing the thresholds in terms of demodulator loop transfer function. The threshold formulas thus developed are then applied using four specific forms of transfer functions. The relative merits of each are displayed graphically for ready comparison. Finally, the FMFB technique is compared on a threshold power basis with other FM demodulation methods. View full abstract»

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  • Electromagnetic Propagation through Shock Ionized Air Surrounding Glide Re-Entry Spacecraft

    Publication Year: 1962 , Page(s): 257 - 266
    Cited by:  Papers (2)
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    Radio frequency communication with spacecraft is necessary during all phases of flight including the period of atmospheric re-entry. During re-entry, the velocity of these vehicles is sufficiently high to induce thermal ionization of the air surrounding the vehicle. Resultant electron concentrations are in some cases high enough to interfere with normal communications with the vehicle. This interference takes the form of attenuation or reflection of signals transmitted from the vehicle. Exact analysis of the problem requires precise information regarding the flow field surrounding the vehicle of interest. Since these data are generally unavailable until late in the vehicle design phase, it is the purpose of this paper to examine means by which an approximation of the interference effects may be obtained when only the trajectory and body configuration are known. Many glide vehicle designs are complex in their shape; however, for the purposes of analysis of phenomena associated with the vehicle configuration, the vehicle may be considered to be composed of combinations of shapes having more elemental forms. A procedure is described by which analysis of propagation effects for these elemental bodies may be used to approximate the conditions to be expected in the corresponding region of the more complex vehicle. A sample problem is presented as a demonstration of the procedure. View full abstract»

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  • Study and Experimental Investigation on Sampling Rate and Aliasing in Time-Division Telemetry Systems

    Publication Year: 1962 , Page(s): 267 - 283
    Cited by:  Papers (5)
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    A study to determine the effect of 1) data power spectrum, and 2) system design parameters on aliasing and data interpolation error has been conducted. Results are applicable to time-division multiplexed telemetry systems. In particular, the results apply to the commonly used PAM-FM, PDM-FM and PCM-FM telemetry systems and PACM-FM. Data was obtained on the basis of combined analysis and experiment with emphasis on the derivation of experimentally proven design parameters. The program consisted of three phases: 1) A study was conducted to determine typical telemetry data spectra; 2) analysis was performed to predict accuracy performance of practical data and interpolation filters using selected examples; 3) experimental tests using data spectral models were performed to derive proven interpolation accuracy performance on the basis of practical filters and design parameters. The experimental tests utilized a PAM-FM system to derive an accurate measurement of attainable performance and to indicate when other equipment factors begin to impose a limit on data recovery accuracy. Spectral models representing typical spectral data characteristics are presented. In addition, some of the more important conclusions relating to operating parameters are presented. View full abstract»

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  • SS-FM: A Telemetry Technique for Wide-Band Data

    Publication Year: 1962 , Page(s): 283 - 289
    Cited by:  Papers (2)
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    A telemetry technique is discussed which promises to alleviate an enigma facing the telemetry engineer: How to adequately transmit the avalanche of vibration and other wide-band data desired in the development phase of large missiles and launch vehicles. The data channels are stacked in the frequency spectrum as single-sideband subcarriers which frequency-modulate the RF carrier. The system design utilizes to advantage the statistical properties of vibration data to achieve maximum data transmission efficiency from the available RF carrier deviation. However, in contrast to proposed statistical predigestion techniques, the data is transmitted in raw form. The background and philosophy of the technique is given, followed by a general description of the SS-FM vehicle and ground telemetry equipment utilized in the Saturn vehicle program and a summary of system characteristics and performance. View full abstract»

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  • Attainable Error Probabilities in Demodulation of Random Binary PCM/FM Waveforms

    Publication Year: 1962 , Page(s): 290 - 297
    Cited by:  Papers (8)
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    The deviation ratio required for minimum obtainable bit-error probability for random binary PCM/FM waveforms is derived. The resulting minimum obtainable bit-error probabilities are calculated and compared with those obtained expenimentally and independently in two different laboratories using conventional demodulation equipment. The amplitude distribution of video noise in conventional FM receivers is investigated theoretically and experimentally in an attempt to interpret the effect (or lack of effect) of video filtering on error probability. Comparison is also made between theoretically attainable bit-error probabilities for PCM/AM, PCM/PSK, conventional PCM/FM (i.e. frequency modulating a single oscillator) and ``switched PCM/FM'' (i.e. switching between two oscillators of different frequencies). View full abstract»

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  • Contributors

    Publication Year: 1962 , Page(s): 298
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  • Index to IRE Transactions on Space Electronics and Telemetry

    Publication Year: 1962 , Page(s): 299 - 301
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  • [Front cover]

    Publication Year: 1962 , Page(s): c2
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Aims & Scope

This Transactions ceased publication in 1962. The new retitled publication is IEEE Transactions on Aerospace and Electronic Systems.

Full Aims & Scope