A Satellite Multiple-Beam Antenna for High-Rate Data Relays

Greda, Lukasz; Winterstein, Andreas; Dreher, Achim; Figur, Sascha A.; Schonlinner, B.; Ziegler, Volker; Haubold, Marco; Brueck, and Martin W.

doi:10.2528/pier14072502

Cited by 9 publications

(10 citation statements)

References 18 publications

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“…There are many different applications of reflector antennas for GEO communication satellites [26][27][28][29][30][31][32][33].…”

Section: Geo Satellite Communication Antennasmentioning

confidence: 99%

Antennas for Space Applications: A Review

Akan¹,

Yazgan²

2020

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

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It is well known that antennas are inevitable for wireless communication systems. After the launch of Sputnik-1 which was the first artificial satellite developed by USSR (Union of Soviet Socialist Republics), telecommunication technologies started to develop for space excessively. However, significance of the antennas as first or final RF-front end element has not been altered for the space communication systems. In this chapter, after introducing telecommunication and antenna technologies for space, which space environmental conditions are to be faced by these antennas are summarized. Then, frequency allocation that is a crucial design factor for antennas is explained and tabulated. And finally at the last part, different types of antennas used in different space missions are presented with their functional parameters and tasks.

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“…There are many different applications of reflector antennas for GEO communication satellites [26][27][28][29][30][31][32][33].…”

Section: Geo Satellite Communication Antennasmentioning

confidence: 99%

Antennas for Space Applications: A Review

Akan¹,

Yazgan²

2020

Advanced Radio Frequency Antennas for Modern Communication and Medical Systems

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“…In this work, we give only a short description of the system concept. Detailed information including implementation requirements and performance analysis was already published in Greda et al Figure shows the general idea of the GEO data relay. In this figure, 3 LEO satellites send signals towards a single GEO satellite at the same time, using small steerable reflector antennas.…”

Section: Satellite Data Relay System Conceptmentioning

confidence: 99%

“…Frequency division multiple access is used to avoid interference between the signals. The target system shall provide 25 channels in the intersatellite link band around 26 GHz with 36 MHz bandwidth each and a spacing of 40 MHz between channels . The channel spacing is enough to tolerate any occurring Doppler shifts, as they will be below 750 kHz.…”

Section: Satellite Data Relay System Conceptmentioning

confidence: 99%

“…The key components of the receiver system are described in the following. More details can be found in Greda et al and Greda et al …”

Section: Experimental Receiver System Setupmentioning

confidence: 99%

“…Therefore, a new concept of an electronically steerable multibeam array‐fed reflector antenna that can receive data from several LEO satellites in parallel was proposed in Greda et al and presented in Greda et al In this concept, highly directive beams towards LEO satellites are generated using small subarrays of a bigger feed array. The elements of these subarrays can be dynamically selected by analog multiplexers in the radio frequency (RF) domain.…”

Section: Introductionmentioning

confidence: 99%

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An adaptive calibration and beamforming technique for a GEO satellite data relay

Winterstein

Greda

2017

Satell Commun Network

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High throughput data links from low Earth orbit satellites through a geostationary orbit satellite data relay have been proposed to increase the available contact times to ground stations. Accurate antenna beam pointing and tracking of moving targets are key requirements for the relay satellite. In this work, we propose an adaptive calibration and beamforming methodology on the basis of least mean squares, which is suitable for a geostationary orbit data relay. The target system consists of the combination of a high gain reflector fed by a digitally steerable patch antenna array. The proposed method is first presented by numerical cosimulation of the antenna and the calibration algorithm. The results are then validated in an outdoor experimental setup with all digital signal processing implemented in a field-programmable gate array. We demonstrate the tracking ability and pointing performance of the digitally enhanced reflector antenna with gain fluctuations smaller than 3 dB over a field of view of at least 2,5 • . The demonstrated performance shows that the digitally enhanced reflector antenna is a suitable candidate for long-distance space communications. KEYWORDSadaptive signal processing, beamforming, calibration, least mean squares methods, reflector antennas INTRODUCTIONDuring the last years, the number of low Earth orbit (LEO) satellites for Earth observation purposes has increased significantly, and this trend will most probably continue in the future. 1 Each new generation of these satellites has better instruments on board and therefore can collect increasing amounts of data. Low Earth orbit satellites for Earth observation fly at altitudes between 500 and 800 km with orbital periods of roughly 100 minutes. As the contact time of a LEO satellite to a single ground station is relatively short during 1 orbital period (approximately 5-10 minutes), there is an increasing bottleneck in downloading all gathered data to Earth. Urgent data may have to wait for the next contact to be downloaded.Raising the amount of transmittable data can be done by increasing either the transmission data rate or its length. A significant increase in data rate can only be achieved if bigger antennas and/or more transmit power are used. Because of severe mass and power constraints on the LEO satellites, this can only be done to a moderate extent. A significant increase in the downloading time can be achieved, if a network of ground stations is used instead of a single one. However, the necessary overhead to synchronize and reunite the distributed data snippets would be considerable.Moreover, it leads to tremendous building and operation costs, as the ground stations should preferably be located in the polar regions because of highest visibility.That is why another option is used more and more frequently to increase the amount of downloaded data-a data relay to the Earth using geostationary orbit (GEO) satellites. A GEO satellite is located at a height of roughly 36 000 km above the Earth and has the same rotational rate. Therefo...

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Reflector‐based highly isolated dual‐polarized multibeam antenna

Wang

Zhang

et al. 2023

Micro & Optical Tech Letters

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In this paper, a dual‐polarized multibeam antenna in X‐band is designed and physically fabricated using a parabolic reflector. The antenna consists of a feed array and a metal reflector. A dual‐polarized microstrip antenna array combining two design approaches, T‐coupled feed and defective ground structure, is adopted as the feed array to improve polarization isolation. In addition, the electromagnetic bandgap structure is loaded between the antenna units to reduce the mutual coupling and improve the isolation between the units. A nine element of the highly‐isolated dual‐polarized microstrip antenna array is designed to be placed on the focal plane of the parabolic reflector as the feed, and the beam deflection is realized by using the lateral defocus effect of the parabolic plane, which can finally realize nine single beams covering a 30° scanning range in both horizontal and vertical polarization modes. Based on the scanning state of multiple point beams, this paper uses the Fourier series for beam assignment to form a flat‐top beam with a wide scanning angle. The application of the antenna with two operating modes of wide beam and multibeam to navigational satellite systems can greatly improve the accuracy and efficiency of navigation.

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A Satellite Multiple-Beam Antenna for High-Rate Data Relays

Cited by 9 publications

References 18 publications

Antennas for Space Applications: A Review

Antennas for Space Applications: A Review

An adaptive calibration and beamforming technique for a GEO satellite data relay

Reflector‐based highly isolated dual‐polarized multibeam antenna

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