Uplink Arrays for the Deep Space Network

Davarian, F.

doi:10.1109/jproc.2007.905047

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…As with receiving arrays, the main technical challenge is maintaining phase coherency and a number of solutions have been proposed (Davarian 2007). To keep the phasing losses small, the locations of the tiles must be known to mm accuracy for 2 cm wavelength operation (Ruze 1966).…”

Section: Methodsmentioning

confidence: 99%

Investigating nearby exoplanets via interstellar radar

Scheffer¹

2013

International Journal of Astrobiology

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Interstellar radar is a potential intermediate step between passive observation of exoplanets and interstellar exploratory missions. Compared with passive observation, it has the traditional advantages of radar astronomy. It can measure surface characteristics, determine spin rates and axes, provide extremely accurate ranges, construct maps of planets, distinguish liquid from solid surfaces, find rings and moons, and penetrate clouds. It can do this even for planets close to the parent star. Compared with interstellar travel or probes, it also offers significant advantages. The technology required to build such a radar already exists, radar can return results within a human lifetime, and a single facility can investigate thousands of planetary systems. The cost, although too high for current implementation, is within the reach of Earth's economy.

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Section: Methodsmentioning

confidence: 99%

Investigating nearby exoplanets via interstellar radar

Scheffer¹

2013

International Journal of Astrobiology

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“…This approximation is widely adopted in the literature to study this type of arrays [21,22], which corresponds to the statement that the total collecting area of the array is the sum of the collecting areas given by each antennas.…”

Section: Analytical Formulationmentioning

confidence: 99%

“…This is due to the fact that compared to receiving operations, transmission poses more serious problems. In fact, the lack of a reliable closed loop prevents the application of real-time calibrations and adjustments, as normally done for reception [21]. Therefore higher phase, amplitude and pointing errors are expected.…”

Section: Pointing Errorsmentioning

confidence: 99%

“…short duration, good weather, spacecraft in Earth orbit etc. ), but a fully operable uplink array is still ahead [19,21,26]. For these reasons, the formulas derived in Section 2, which hold for both downlink and uplink can be used to predict the array response for large phase, amplitude and pointing errors, likely to occur if the array was operated in transmission, providing a useful evaluation tool for the expected uplink performance.…”

Section: Pointing Errorsmentioning

confidence: 99%

“…1 is calculated as the sum of the radiated field generated by each antenna, retrieving the maximum array gain. This is possible assuming that no mutual coupling is present between antennas, exactly the same hypothesis already adopted to calculate the equation reported in Section 2 [21,22]. The radiated field generated by each 20 m antenna is calculated by means of a commercial tool based on physical optics [27].…”

Section: Numerical Validationmentioning

confidence: 99%

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Efficiency of arrays composed of high-gain reflector antennas

Pasian

Cametti

Bozzi

et al. 2012

IET Microw. Antennas Propag.

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Arrays composed of high-gain reflector antennas are used for radio-astronomical purposes and, more recently, are proposed as ground station for deep space communications. This latter application requires a precise knowledge of the degradation that phase, amplitude and pointing fluctuations impose on the capability of the array to combine coherently the signal received or transmitted from each antenna. In this study, an analytical model for the fluctuation of each parameter (phase, amplitude and pointing) is derived and it is used to predict the efficiency of an array composed of an arbitrary number of high-gain reflector antennas. The analytical models are verified by numerical simulations and applied to an array layout currently proposed as possible future ground stations for the European Space Agency.

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Tropospheric delay statistics measured by two site test interferometers at Goldstone, California

et al. 2013

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[1] Site test interferometers (STIs) have been deployed at two locations within the NASA Deep Space Network tracking complex in Goldstone, California. An STI measures the difference of atmospheric delay fluctuations over a distance comparable to the separations of microwave antennas that could be combined as phased arrays for communication and navigation. The purpose of the Goldstone STIs is to assess the suitability of Goldstone as an uplink array site and to statistically characterize atmosphere-induced phase delay fluctuations for application to future arrays. Each instrument consists of two~1 m diameter antennas and associated electronics separated by~200 m. The antennas continuously observe signals emitted by geostationary satellites and produce measurements of the phase difference between the received signals. The two locations at Goldstone are separated by 12.5 km and differ in elevation by 119 m. We find that their delay fluctuations are statistically similar but do not appear as shifted versions of each other, suggesting that the length scale for evolution of the turbulence pattern is shorter than the separation between instruments. We also find that the fluctuations are slightly weaker at the higher altitude site.

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Uplink Arrays for the Deep Space Network

Cited by 14 publications

References 10 publications

Investigating nearby exoplanets via interstellar radar

Investigating nearby exoplanets via interstellar radar

Efficiency of arrays composed of high-gain reflector antennas

Tropospheric delay statistics measured by two site test interferometers at Goldstone, California

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