The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
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Este artigo relata nossos novos componentes de comunicação e testes de downlink para atingir 2.65 Gbps utilizando duas polarizações circulares. Desenvolvemos um transmissor de banda X integrado, uma antena dupla de onda polarizada circularmente integrada e uma estação terrestre. No transmissor integrado, otimizamos as condições de polarização do amplificador de alta potência GaN (HPA) para linearizar o desempenho AM-AM. Também projetamos e fabricamos uma antena dupla de onda polarizada circularmente para multiplexação de polarização de baixa diafonia. A antena é composta por uma antena tipo chifre corrugado e um polarizador tipo septo. A antena atinge discriminação de polarização cruzada (XPD) de 37-43dB na banda X alvo. Também modificamos uma antena de estação terrestre existente de 10 m, substituindo seu radiador primário e adicionando um polarizador. Colocamos o polarizador e os Amplificadores de Baixo Ruído (LNAs) em uma câmara criogênica para reduzir o ruído térmico. A temperatura total de ruído do sistema da antena é 58K (máximo) para temperatura física de 18K quando o ângulo de elevação é 90° em um belo dia de inverno. A antena da estação terrestre de onda dupla circularmente polarizada tem 39.0dB/K de ganho - relação de temperatura de ruído do sistema (G/T) e um XPD superior a 37dB. Os sinais downlinked são armazenados em um gravador de dados no local da antena. Posteriormente, decodificamos os sinais usando nosso demodulador de software não em tempo real. Nosso sistema possui eficiência de alta frequência com fator de roll-off α = 0.05 e multiplexação de polarização de 64APSK. Os bits de comunicação por hertz correspondem a 8.41 bits/Hz (2.65 Gbit/315 MHz). O sistema é demonstrado em órbita a bordo do satélite de demonstração de carga útil inovador RAPId (RAPIS-1). O RAPIS-1 foi lançado do Centro Espacial Uchinoura em 19 de janeiro de 2019. Decodificamos 1010 bits de sinais dos canais R e L downlinkados e descobriu que os dados binários downlinked estavam livres de erros. Consequentemente, alcançamos velocidade de comunicação de 2.65 Gbps na banda X para satélites de observação da Terra a 300 Mega símbolos por segundo (Msps) e multiplexação de polarização de 64APSK (taxa de codificação: 4/5) para polarizações circulares direita e esquerda.
Tomoki KANEKO
The University of Tokyo
Noriyuki KAWANO
Japan Aerospace Exploration Agency
Yuhei NAGAO
Radrix Co. Ltd.
Keishi MURAKAMI
Synspective Inc.
Hiromi WATANABE
Keio University
Makoto MITA
Japan Aerospace Exploration Agency
Takahisa TOMODA
Synspective Inc.
Keiichi HIRAKO
Keio University
Seiko SHIRASAKA
Keio University
Shinichi NAKASUKA
The University of Tokyo
Hirobumi SAITO
Japan Aerospace Exploration Agency
Akira HIROSE
The University of Tokyo
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Tomoki KANEKO, Noriyuki KAWANO, Yuhei NAGAO, Keishi MURAKAMI, Hiromi WATANABE, Makoto MITA, Takahisa TOMODA, Keiichi HIRAKO, Seiko SHIRASAKA, Shinichi NAKASUKA, Hirobumi SAITO, Akira HIROSE, "2.65Gbps Downlink Communications with Polarization Multiplexing in X-Band for Small Earth Observation Satellite" in IEICE TRANSACTIONS on Communications,
vol. E104-B, no. 1, pp. 1-12, January 2021, doi: 10.1587/transcom.2019EBN0009.
Abstract: This paper reports our new communication components and downlink tests for realizing 2.65Gbps by utilizing two circular polarizations. We have developed an on-board X-band transmitter, an on-board dual circularly polarized-wave antenna, and a ground station. In the on-board transmitter, we optimized the bias conditions of GaN High Power Amplifier (HPA) to linearize AM-AM performance. We have also designed and fabricated a dual circularly polarized-wave antenna for low-crosstalk polarization multiplexing. The antenna is composed of a corrugated horn antenna and a septum-type polarizer. The antenna achieves Cross Polarization Discrimination (XPD) of 37-43dB in the target X-band. We also modify an existing 10m ground station antenna by replacing its primary radiator and adding a polarizer. We put the polarizer and Low Noise Amplifiers (LNAs) in a cryogenic chamber to reduce thermal noise. Total system noise temperature of the antenna is 58K (maximum) for 18K physical temperature when the angle of elevation is 90° on a fine winter day. The dual circularly polarized-wave ground station antenna has 39.0dB/K of Gain - system-noise Temperature ratio (G/T) and an XPD higher than 37dB. The downlinked signals are stored in a data recorder at the antenna site. Afterwards, we decoded the signals by using our non-real-time software demodulator. Our system has high frequency efficiency with a roll-off factor α=0.05 and polarization multiplexing of 64APSK. The communication bits per hertz corresponds to 8.41bit/Hz (2.65Gbit/315MHz). The system is demonstrated in orbit on board the RAPid Innovative payload demonstration Satellite (RAPIS-1). RAPIS-1 was launched from Uchinoura Space Center on January 19th, 2019. We decoded 1010 bits of downlinked R- and L-channel signals and found that the downlinked binary data was error free. Consequently, we have achieved 2.65Gbps communication speed in the X-band for earth observation satellites at 300 Mega symbols per second (Msps) and polarization multiplexing of 64APSK (coding rate: 4/5) for right- and left-hand circular polarizations.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2019EBN0009/_p
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@ARTICLE{e104-b_1_1,
author={Tomoki KANEKO, Noriyuki KAWANO, Yuhei NAGAO, Keishi MURAKAMI, Hiromi WATANABE, Makoto MITA, Takahisa TOMODA, Keiichi HIRAKO, Seiko SHIRASAKA, Shinichi NAKASUKA, Hirobumi SAITO, Akira HIROSE, },
journal={IEICE TRANSACTIONS on Communications},
title={2.65Gbps Downlink Communications with Polarization Multiplexing in X-Band for Small Earth Observation Satellite},
year={2021},
volume={E104-B},
number={1},
pages={1-12},
abstract={This paper reports our new communication components and downlink tests for realizing 2.65Gbps by utilizing two circular polarizations. We have developed an on-board X-band transmitter, an on-board dual circularly polarized-wave antenna, and a ground station. In the on-board transmitter, we optimized the bias conditions of GaN High Power Amplifier (HPA) to linearize AM-AM performance. We have also designed and fabricated a dual circularly polarized-wave antenna for low-crosstalk polarization multiplexing. The antenna is composed of a corrugated horn antenna and a septum-type polarizer. The antenna achieves Cross Polarization Discrimination (XPD) of 37-43dB in the target X-band. We also modify an existing 10m ground station antenna by replacing its primary radiator and adding a polarizer. We put the polarizer and Low Noise Amplifiers (LNAs) in a cryogenic chamber to reduce thermal noise. Total system noise temperature of the antenna is 58K (maximum) for 18K physical temperature when the angle of elevation is 90° on a fine winter day. The dual circularly polarized-wave ground station antenna has 39.0dB/K of Gain - system-noise Temperature ratio (G/T) and an XPD higher than 37dB. The downlinked signals are stored in a data recorder at the antenna site. Afterwards, we decoded the signals by using our non-real-time software demodulator. Our system has high frequency efficiency with a roll-off factor α=0.05 and polarization multiplexing of 64APSK. The communication bits per hertz corresponds to 8.41bit/Hz (2.65Gbit/315MHz). The system is demonstrated in orbit on board the RAPid Innovative payload demonstration Satellite (RAPIS-1). RAPIS-1 was launched from Uchinoura Space Center on January 19th, 2019. We decoded 1010 bits of downlinked R- and L-channel signals and found that the downlinked binary data was error free. Consequently, we have achieved 2.65Gbps communication speed in the X-band for earth observation satellites at 300 Mega symbols per second (Msps) and polarization multiplexing of 64APSK (coding rate: 4/5) for right- and left-hand circular polarizations.},
keywords={},
doi={10.1587/transcom.2019EBN0009},
ISSN={1745-1345},
month={January},}
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TY - JOUR
TI - 2.65Gbps Downlink Communications with Polarization Multiplexing in X-Band for Small Earth Observation Satellite
T2 - IEICE TRANSACTIONS on Communications
SP - 1
EP - 12
AU - Tomoki KANEKO
AU - Noriyuki KAWANO
AU - Yuhei NAGAO
AU - Keishi MURAKAMI
AU - Hiromi WATANABE
AU - Makoto MITA
AU - Takahisa TOMODA
AU - Keiichi HIRAKO
AU - Seiko SHIRASAKA
AU - Shinichi NAKASUKA
AU - Hirobumi SAITO
AU - Akira HIROSE
PY - 2021
DO - 10.1587/transcom.2019EBN0009
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E104-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2021
AB - This paper reports our new communication components and downlink tests for realizing 2.65Gbps by utilizing two circular polarizations. We have developed an on-board X-band transmitter, an on-board dual circularly polarized-wave antenna, and a ground station. In the on-board transmitter, we optimized the bias conditions of GaN High Power Amplifier (HPA) to linearize AM-AM performance. We have also designed and fabricated a dual circularly polarized-wave antenna for low-crosstalk polarization multiplexing. The antenna is composed of a corrugated horn antenna and a septum-type polarizer. The antenna achieves Cross Polarization Discrimination (XPD) of 37-43dB in the target X-band. We also modify an existing 10m ground station antenna by replacing its primary radiator and adding a polarizer. We put the polarizer and Low Noise Amplifiers (LNAs) in a cryogenic chamber to reduce thermal noise. Total system noise temperature of the antenna is 58K (maximum) for 18K physical temperature when the angle of elevation is 90° on a fine winter day. The dual circularly polarized-wave ground station antenna has 39.0dB/K of Gain - system-noise Temperature ratio (G/T) and an XPD higher than 37dB. The downlinked signals are stored in a data recorder at the antenna site. Afterwards, we decoded the signals by using our non-real-time software demodulator. Our system has high frequency efficiency with a roll-off factor α=0.05 and polarization multiplexing of 64APSK. The communication bits per hertz corresponds to 8.41bit/Hz (2.65Gbit/315MHz). The system is demonstrated in orbit on board the RAPid Innovative payload demonstration Satellite (RAPIS-1). RAPIS-1 was launched from Uchinoura Space Center on January 19th, 2019. We decoded 1010 bits of downlinked R- and L-channel signals and found that the downlinked binary data was error free. Consequently, we have achieved 2.65Gbps communication speed in the X-band for earth observation satellites at 300 Mega symbols per second (Msps) and polarization multiplexing of 64APSK (coding rate: 4/5) for right- and left-hand circular polarizations.
ER -