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2.65Gbps Downlink Communications with Polarization Multiplexing in X-Band for Small Earth Observation Satellite
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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.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E104-B No.1 pp.1-12
- Publication Date
- 2021/01/01
- Publicized
- 2020/07/01
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.2019EBN0009
- Type of Manuscript
- POSITION PAPER
- Category
- Satellite Communications
Authors
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
Keyword
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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},}
Copy
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 -
English
