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Space Electronics and Telemetry, IEEE Transactions on

Popular Articles (June 2015)

Includes the top 50 most frequently downloaded documents for this publication according to the most recent monthly usage statistics.
  • 1. Unambiguous Accuracy of an Interferometer Angle-Measuring System

    Publication Year: 1965 , Page(s): 62 - 70
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1384 KB)  

    In this paper we consider the problem of using signals received at three or four antennas to estimate the direction from which radio-frequency (RF) radiation is arriving. Though the results are couched in the terminology of angle measurements, they are applicable to any ambiguous measurements for which the number of ambiguities is inversely proportional to the accuracy. For an interferometric syst... View full abstract»

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  • 2. Design of a Digital Notch Filter with Tracking Requirements

    Publication Year: 1963 , Page(s): 109 - 114
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1053 KB)  

    The development of a digital filter using sampled data theory techniques and having a desired frequency response characteristic is described. Specifically, design of a digital notch filter is accomplished through formulation of a regression equation for application to sampled input and output values from the filter. After first expressing the desired transfer function in the continous domain, the ... View full abstract»

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  • 3. Optimal Ranging Codes

    Publication Year: 1964 , Page(s): 19 - 30
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2340 KB)  

    This paper provides an analysis of a continuous, coded ranging scheme. By the use of a Boolean function, several "component" sequences are encoded into a transmitted signal. The receiver correlates the delayed return signal with different Boolean combinations of delayed replicas of the components to determine separately the time delay of each component sequence. From these delays, the total delay ... View full abstract»

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  • 4. Delay-Lock Tracking of Binary Signals

    Publication Year: 1963 , Page(s): 1 - 8
    Cited by:  Papers (84)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1689 KB)  

    This paper presents the theory of operation and an evaluation of performance of a delay-lock tracking system for binary signals. The delay-lock discriminator is a nonlinear feedback system which employs a form of cross correlation in the feedback loop and continuously estimates the relative delay between a reference signal and a delayed version of that signal which is perturbed with additive noise... View full abstract»

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  • 5. The Autocorrelation Function and Power Spectrum of PCM/FM with Random Binary Modulating Waveforms

    Publication Year: 1964 , Page(s): 39 - 44
    Cited by:  Papers (25)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1308 KB)  

    This paper presents the derivation of exact expressions for the autocorrelation function and power spectrum of PCM/FM or FSK when the frequency modulating waveform is a random sequence of binary pulses of length T. The problem treated is that of true frequency modulation of an oscillator, a process which, except for a few special cases, generates waveforms and spectra different from those produced... View full abstract»

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  • 6. Magnetic Fields near Twisted Wires

    Publication Year: 1964 , Page(s): 154 - 158
    Cited by:  Papers (13)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (572 KB)  

    Formulas are given for the field near twisted leads carrying equal and opposite direct currents, and results are plotted in dimensionless form for various cases. At some points twisting the wires is shown to strengthen rather than weaken the field. View full abstract»

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  • 7. Analog-to-Digital Conversion by Means of Delta Modulation

    Publication Year: 1964 , Page(s): 87 - 90
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (835 KB)  

    It is shown that normal delta modulation can be used for the transmission of dc signals. A circuit is described in which a delta modulator is combined with a counter for analog-to-digital conversion of a dc signal. Several factors contributing to the accuracy are developed. One of these factors which has not been dealt with previously is the size of the steps in the reconstructed signal due to the... View full abstract»

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  • 8. Coded Noncoherent Communications

    Publication Year: 1965 , Page(s): 6 - 13
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1367 KB)  

    This paper presents detailed results on the relative merits of encoding blocks of binary digits into a set of equiprobable, equal energy, orthogonal signals each containing n bits of information. During a time interval of T seconds, one signal from this set is selected and transmitted over the ``Rician'' channel, further perturbed by additive white Gaussian noise and noncoherently detected at the ... View full abstract»

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  • 9. Telemetry Error Measurements Using Pseudo-Random Signals

    Publication Year: 1964 , Page(s): 111 - 115
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1669 KB)  

    Conventional methods of measuring wide-band data error in continuous telemetry systems use shaped random noise to simulate the signal. This article describes the advantages of using discrete pseudo-random signals for this application. Results for a typical frequency-division telemetry system are presented. View full abstract»

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  • 10. Radio Interferometer Phase-Channel Combiner Mod. II for the Navy Space Surveillance System

    Publication Year: 1964 , Page(s): 116 - 123
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3920 KB)  

    The Space Surveillance System developed at the U. S. Naval Research Laboratory, Washington, D. C., for the detection of earth satellites forms a fence across the southern part of the United States. Four receiving sites are alternated with three transmitting sites which illuminate satellites with radio energy as they traverse the fence. The angle of arrival of the reflected energy is measured at ea... View full abstract»

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  • 11. Heat-Sinking Techniques for Power Transistors in a Space Environment

    Publication Year: 1963 , Page(s): 45 - 51
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3958 KB)  

    An investigation was made of the cooling of power transistors in a space environment, where the only available mode of heat transfer is that of conduction to a heat sink and radiation from the heat sink to space. An attempt was made to minimize the thermal resistance between transistor case and heat sink, allowing the transistor to dissipate as much power as possible while maintaining its temperat... View full abstract»

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  • 12. Optimum Filters for Second- and Third-Order Phase-Locked Loops by an Error-Function Criterion

    Publication Year: 1965 , Page(s): 54 - 62
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1256 KB)  

    The advantages of a third-order phase-locked loop for FM television is considered here. The bandwidth is maintained small and since the operation is generally at frequencies small compared to the bandwidth, the criterion is to keep error as small as possible in this frequency range. A study is made by comparing second- and third-order phase-locked loops designed from Wiener filtering theory, as ad... View full abstract»

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  • 13. Multiple Access to a Hard-Limiting Communication-Satellite Repeater

    Publication Year: 1964 , Page(s): 159 - 167
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1539 KB)  

    This paper analyzes the communication capability of a hard-limiting satellite repeater when spread-spectrum signals are used for asynchronous access multiplexing. It derives formal results which indicate the most suitable system bandwidth and the resulting maximum number of simultaneous users as a function of the ratio of the received signal power (over the entire system bandwidth) from the satell... View full abstract»

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  • 14. Transmitter Power Reduction with Frequency Tracking FM Receivers

    Publication Year: 1963 , Page(s): 18 - 25
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1945 KB)  

    In analog communication studies much attention has recently been given to the apparent advantages of FM transmission with receivers employing feedback frequency tracking. Although theoretical investigation has indicated some carrier power reduction can be obtained over standard FM, it has been difficult to estimate the operating capabilities of the system. In addition, little has been published co... View full abstract»

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  • 15. Optimum Coherent Phase and Frequency Demodulation of a Class of Modulating Spectra

    Publication Year: 1964 , Page(s): 95 - 102
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1498 KB)  

    The optimum phase-locked loop demodulator is obtained for a carrier, phase modulated by a stationary Gaussian modulating process whose spectrum is proportional to 1/1 + (f/B)2n where n is any positive integer. Results are obtained also when the carrier is frequency modulated by the process for the limiting cases n = 1 and as n approaches infinity. It is shown that for phase modulation the output S... View full abstract»

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  • 16. Oscillator Stability and the Second-Order Phase-Locked Loop

    Publication Year: 1964 , Page(s): 65 - 69
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (935 KB)  

    The causes of short-term oscillator instability are discussed. The effects of the instability of the received signal on the phase-locked loop performance are analyzed in terms of resultant mean-squared loop phase error. The results of the analysis permit the calculation of the effects of oscillator instability in the transmitter on the loop bandwidth and power requirement. They also furnish a syst... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1965. The new retitled publication is IEEE Transactions on Aerospace and Electronic Systems.

Full Aims & Scope