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Space Electronics and Telemetry, IRE Transactions on

Issue 3 • Date Sept. 1961

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  • [Front cover]

    Publication Year: 1961 , Page(s): c1
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  • IRE Professional Group on Space Electronics and Telemetry

    Publication Year: 1961 , Page(s): nil1
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  • [Breaker page]

    Publication Year: 1961 , Page(s): nil1
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  • Availability of Moon for Global Communications

    Publication Year: 1961 , Page(s): 57 - 59
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    This paper describes a method for quickly and quite accurately estimating the time that the moon is in common view of two stations on earth during the lunar day. A mathematical derivation tion and a detailed description of the method are given, together with a nomogram which simplifies the calculation. A sample problem is solved and a short table of time availability for several links of interest is included. View full abstract»

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  • Thresholds and Tracking Ranges in Phase-Locked Loops

    Publication Year: 1961 , Page(s): 60 - 70
    Cited by:  Papers (1)
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    This paper presents a general discussion of phase-locked-loop thresholds and tracking ranges. A typical phase-locked loop and its linear equivalent are introduced, and there is a brief discussion of application of the root locus method and the Bode amplitude plot to this circuit. Calculation of the maximum allowable deviation is considered for both phase and frequency modulation (sinusoidal). The SNR threshold is a function of tracking and modulation, and may vary considerably. Threshold behavior¿with and without limiting¿is discussed, and methods are presented for estimating the threshold in each case. Calculating the tracking range and variation of the tracking range with threshold variation are also discussed. Since an increase in tracking range and a decrease in threshold are obvious design objectives, procedures are given for achieving these goals. After a description of the effects of interference on tracking and the threshold, there is a brief report of a phase-locked-loop intelligibility study conducted by Philco Western Development Laboratories. Appendixes I-IV consider: 1) a phase-locked loop containing an IF amplifier, 2) designing a loop to track Doppler shift only, and 3) improving the SNR by increasing deviation. View full abstract»

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  • The Effect of Antenna Characteristics on Antenna Noise Temperature and System SNR

    Publication Year: 1961 , Page(s): 71 - 79
    Cited by:  Papers (1)
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    With the development of low-noise amplifiers, the noise contribution of the antenna has become a limiting factor on system performance in many applications. This paper discusses the calculation of the equivalent noise temperature contribution of parabolic reflector antennas using their radiation characteristics and environment. As an example, the equivalent noise temperature of an 85-foot reflector at 2 kMc is estimated as a function of orientation for two different primary illuminations. The relative contributions of the mainlobe, sidelobes and backlobes to the total antenna noise temperature is determined in each case to show the effect of antenna radiation characteristics on noise temperature. A functional relationship between the primary illumination of a parabolic reflector antenna and the system SNR is then derived from which the edge illumination producing the maximum SNR can be specified for a given family of primary illuminations. View full abstract»

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  • Fundamental Accuracy Limitations in a Two-Way Coherent Doppler Measurement System

    Publication Year: 1961 , Page(s): 80 - 85
    Cited by:  Papers (5)
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    This paper derives relationships which express the contribution of ground-receiver noise and round-trip transit time to the errors in two-way radio Doppler measurements. Only one method of Doppler measurement is considered. This is the method of counting the number of cycles in a given time interval. From this measurement the signal frequency may then be determined. In usual tracking systems this frequency measurement is further utilized to determine the range-rate of the vehicle with respect to the tracking station. The power-spectral densities of additive-receiver noise and oscillator-frequency noise are assumed white. This situation prevails when the random disturbances are thermal in origin. This is a tractable assumption when one seeks fundamental accuracy limitations for Doppler measurement. The results of this paper should be useful to those concerned with radio tracking and, in particular, tracking of space probes. View full abstract»

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  • Contributors

    Publication Year: 1961 , Page(s): 86
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  • Institutional listings

    Publication Year: 1961 , Page(s): nil4
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  • [Front cover]

    Publication Year: 1961 , 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