10-60 GHz GT measurements using the sun as a source-- a preliminary study

Daywitt, William C.

doi:10.6028/nbs.ir.86-3046

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…G/T was measured from the terrestrial sources from Sun Methods [18], 32 dB/K. A low-noise amplifer (43 K noise temperature) was integrated with the feed to minimize noise.…”

Section: Resultsmentioning

confidence: 99%

Design and Realization of an X Band Monopulse Feed Antenna for Low Earth Orbit (LEO) Satellite Ground Station

Şişman,

Haykir Ergin,

Erol Barkana

et al. 2024

International Journal of Antennas and Propagation

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In this work, design of a five-element compact dual-polarization X band monopulse feed antenna using a 7.3 m Cassegrain-type reflector for Low Earth Orbit (LEO) satellite ground station is presented. The designed antenna has reached 32 dB/K G/T value, the side lobe level of the designed antenna is at the level of −24 dB, the crosspolarization value is −35 dB, and the port isolation value is below −29 dB in the 8–8.5 GHz frequency range. The antenna efficiency of the designed antenna is measured as 79.93%.

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“…G/T was measured from the terrestrial sources from Sun Methods [18], 32 dB/K. A low-noise amplifer (43 K noise temperature) was integrated with the feed to minimize noise.…”

Section: Resultsmentioning

confidence: 99%

Design and Realization of an X Band Monopulse Feed Antenna for Low Earth Orbit (LEO) Satellite Ground Station

Şişman,

Haykir Ergin,

Erol Barkana

et al. 2024

International Journal of Antennas and Propagation

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“…Despite these handicaps, this is a potentially useful calibrating source under some ci rcumstances . Earth station antenna gain can be determined by measuring the absolute power out of the antenna when the receiving system is "looking" at the reference source; and the receiving system G/T can be determined [7,8] by measuring the relative power out of the antenna when the system is pointed at the cold sky background.…”

Section: Natural Extraterrestrial Sourcesmentioning

confidence: 99%

“…The details and highlights of this method are presented in [8], an NBS report on work accomplished as part of this EHF study.…”

Section: Correction Techniques For Atmospheric Effectsmentioning

confidence: 99%

Calibration requirements for EHF satellite communication systems

Baird¹,

Daywitt²,

Newell³

et al. 1986

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The calibration and measurement support requirements of millimeter wave satellite systems such as MILSTAR have been investigated. The needs for measurements on satellite systems are reviewed. An overview of the various means available for calibrating antenna gain, one of the key measurements that needs to be accurately accomplished, is presented. Essentially three new measurement problems arise because of operating in the upper SHF and EHF frequency ranges. First, without adequate methods to measure the atmospheric loss, the accuracy of effective isotropic radiated power (EIRP) measurements in the 20-45 GHz range can be no better than 0.5-3 dB (depending on frequency and antenna elevation angle), which is inadequate for MILSTAR requi rements. Second, standards and measurement support services are not presently available from the National Bureau of Standards and are needed to support millimeter wave antenna gain and thermal noise measurements. Third, if the Sun and/or Moon are to be used for measuring Earth terminal G/T, Earth terminal antenna gain, or satellite EIRP in the millimeter region, they need to be appropriately characteri zed at those frequencies.

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