The Ground Transmitter and Receiver

Giger, A. J.; Pardee, S.; Wickliffe, P. R.

doi:10.1002/j.1538-7305.1963.tb04028.x

Cited by 10 publications

(1 citation statement)

References 11 publications

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“…His data show, for example, that at 15 MHz and an elevation of 30° precipitation produces noise in excess of 85 oK for 5 percent of the time; the median is 35 °K with no condensed water in the air. Noise increases caused by rain on radomes have been studied by Gibble [1964] and Giger, Pardee, and Wickliffe (1963].…”

Section: Effective Noise Temperaturementioning

confidence: 99%

U.S.A. National Committee Report, Fifteenth URSI General Assembly, Munich, September 1966: Commission 2, Radio Propagation in Nonionized Media; Progress in Radio Propagation in Nonionized Media

Katz¹,

Ament²,

Atlas³

et al. 1966

Radio Science

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In 1965 there was a strong reawakening of interest in “angel” or clear‐air radar echoes. Atlas [1965] postulated that "dot" or point‐like angles were reflections from smooth, sharp boundaries at the apex of convective thermals. Focusing from the curved surface reduced the requirement on the index gradient to 1 N unit through 1 em; however, the requirement of smoothness to a fraction of a em over the first Fresnel zone is still severe and lacks experimental confirmation. Dot angel activity at night requires another explanation. Hardy, Atlas, and Glover [1966] and Deam and LaGrone [1965] conclude that dot angel characteristics are explainable only if the targets are insects. These conclusions stem from considerations of absolute cross section and wavelength dependence.

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Section: Effective Noise Temperaturementioning

confidence: 99%

U.S.A. National Committee Report, Fifteenth URSI General Assembly, Munich, September 1966: Commission 2, Radio Propagation in Nonionized Media; Progress in Radio Propagation in Nonionized Media

Katz¹,

Ament²,

Atlas³

et al. 1966

Radio Science

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The FM Demodulator with Negative Feedback

Giger¹,

Chaffee²

1963

Bell System Technical Journal

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This paper describes the design and theory of operation of the wideband FM demodulator with feedback (FMFB receiver) used at the Andover, Maine, earth station for Telstar satellite communications tests. Performance data for the FMFB receiver indicate a clear advantage over the conventional FM receiver in many cases. The principal advantage lies in the ability of the FMFB receiver to raise the threshold at which “breaking” occurs for TV and other wideband signals.

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Orbit Determination and Prediction, and Computer Programs

Claus

Blackman

Halline³

et al. 1963

Bell System Technical Journal

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Orbit determination and prediction programs are needed to generate ephemerides for the satellite. Orbit determination is from tracking data consisting of angles only, and is based on a modified version of a method by R. E. Briggs and J. W. Slowey of the Smithsonian Institution. Trends in the data due to perturbations from a Keplerian orbit are removed before this process, and estimates of the orbital elements from individual passes are combined statistically to produce refined estimates. Ephemeris calculation is by a semi‐analytic method in which deviations from a Keplerian orbit are obtained by integrating the perturbing forces. The programs to implement these procedures have been written for both the IBM 7090 and the IBM 1620 computers.

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The Ground Transmitter and Receiver

Cited by 10 publications

References 11 publications

U.S.A. National Committee Report, Fifteenth URSI General Assembly, Munich, September 1966: Commission 2, Radio Propagation in Nonionized Media; Progress in Radio Propagation in Nonionized Media

U.S.A. National Committee Report, Fifteenth URSI General Assembly, Munich, September 1966: Commission 2, Radio Propagation in Nonionized Media; Progress in Radio Propagation in Nonionized Media

The FM Demodulator with Negative Feedback

Orbit Determination and Prediction, and Computer Programs

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