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Space Electronics and Telemetry, IEEE Transactions on

Issue 2 • Date June 1965

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Displaying Results 1 - 13 of 13
  • [Front cover]

    Page(s): c1
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    Freely Available from IEEE
  • IEEE Space Electronics and Telemetry Group

    Page(s): nil1
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  • [Breaker page]

    Page(s): nil1
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  • Merger of this Group and Cessation of These Transactions

    Page(s): 53
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  • Optimum Filters for Second- and Third-Order Phase-Locked Loops by an Error-Function Criterion

    Page(s): 54 - 62
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    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 advanced by Jaffe and Rechtin [1]; considerable improvement in error is evident using a third-order phase-locked loop for frequencies up to about one-twentieth of the bandwidth. To improve the error function still further, a new error-function criterion is established whereby the error at the lower frequencies of interest is minimized. Such a minimum is obtained for both second- and third-order phase-locked loops. Transfer function behavior, transient response, and root locus plots of all these cases are given to emphasize the advantages of this new design. Error is reduced up to six decibels with no degradation of transient response, overshoot, etc. It is shown that the bandwidth can be reduced without increasing the error if the filter designed by this new criterion is used. View full abstract»

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  • Unambiguous Accuracy of an Interferometer Angle-Measuring System

    Page(s): 62 - 70
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    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 system the effect of receiver noise is examined. Then the optimum way to process the received waveforms, and the best spacing for the antennas, is determined. Next, signal-to-noise ratio (SNR) requirements are determined which must be met to insure that, with a given probability, the final unambiguous measurement is not in error by more than some specified amount. Finally, a comparison is made between a system which uses unambiguous measurements and a system which uses ambiguous measurements and then resolves the ambiguities. View full abstract»

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  • Power Spectrum of PAM/FM and PAM/PM

    Page(s): 70 - 77
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    Mathematical expressions are obtained for FM and PM power spectra when the modulating waveform is a constantrate random sequence of nonoverlapping pulses with arbitrary shape and amplitude distribution. These expressions essentially reduce the computation of power spectrum to the computation of the average energy spectrum of a section of the wave only two pulses in length. The results are applied to the special PAM/FM case where the modulating pulses have a rectangular shape and uniformly distributed amplitude. Spectra are plotted for several values of the deviation ratio. Results are also given for the much simpler case of binary PAM/PM for arbitrary phase deviations. View full abstract»

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  • A Precision Planetary Range-Tracking Radar

    Page(s): 78 - 85
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    A closed-loop range-locked radar system developed by the Jet Propulsion Laboratory has recently had great success range tracking the planet Venus. It has provided measurements to the planetary mean-tracking point with peak minute-to-minute variations less than 2.25 to 3 Km in range. Over a one-hour tracking period, a mean tracking point can be determined to 0.5 km. A scattering-law calibration of the planet is made each day, measuring the mean-tracking-point-to-planetary-surface distance to within 3 km (nominal). The subearth point-to-radar distance is thus measured to a nominal accuracy of 3.5 km. Tracking behaves as a first-order linear ``range-locked'' loop with ephemeris aid, and is practically calibration free. Data obtained during the 1964 conjunction showed that the ephemeris not only contained a range error, but also a range-rate error of 18 km per day. Deviations from this rate correspond to surface features whose height can be estimated. Such data will be invaluable in determining, to a greater degree of accuracy than ever before attainable, the orbital constants of the earth and Venus. View full abstract»

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  • Power Spectrum of a Random PCM-FM Wave

    Page(s): 85 - 86
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    First Page of the Article
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  • Contributors

    Page(s): 87
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  • Call for Papers

    Page(s): 88
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  • 1966 Aerospace Conference

    Page(s): 88
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  • [Front cover]

    Page(s): c2
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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