The Experts below are selected from a list of 22605 Experts worldwide ranked by ideXlab platform
B S Robinson - One of the best experts on this subject based on the ideXlab platform.
-
body pointing acquisition and tracking for small satellite Laser Communication
Free-Space Laser Communications XXXI, 2019Co-Authors: Jessica T Chang, Curt M Schieler, Kathleen Riesing, Jamie W Burnside, Kenneth Aquino, B S RobinsonAbstract:Free-space optical Communications in space offer many benefits over established radio frequency based Communication links; in particular, high beam directivity results in efficient power usage. Such a reduced power requirement is particularly appealing to small satellites with strict size, weight and power (SWaP) requirements. In the case of free-space optical Communication, precise pointing, acquisition and tracking (PAT) of the incoming beam is necessary to close the Communication link. Due to the narrow beam of the Laser, the critical task of accomplishing PAT becomes increasingly arduous and often requires complex systems of optical and processing hardware to account for relative movement of the terminals. Recent developments in body pointing mecha- nisms have allowed small satellites to point with greater precision. In this work, we consider an approach to a low-complexity PAT system that utilizes a single quad-cell photodetector as an optical spatial sensor, and exploits the body pointing capabilities of the spacecraft to perform the tracking maneuvers, eschewing the need for additional dedicated optical hardware. We look at the PAT performance of this approach from a systems analysis viewpoint and present preliminary experimental results. In particular, we examine the implementation of the system on NASA's TeraByte InfraRed Delivery (TBIRD) demonstration.
-
the lunar Laser Communication demonstration time of flight measurement system overview on orbit performance and ranging analysis
Proceedings of SPIE, 2016Co-Authors: M L Stevens, M M Willis, B S Robinson, Joseph A Greco, Ronald R Parenti, Farzana I Khatri, Don M BorosonAbstract:The Lunar Laser Communication Demonstration (LLCD) flown on the Lunar Atmosphere and Dust Environment Explorer (LADEE) satellite achieved record uplink and downlink Communication data rates between a satellite orbiting the Moon and an Earth-based ground terminal. In addition, the high-speed signals of the Communication system were used to accurately measure the round-trip time-of-flight (TOF) of signals sent to the Moon and back to the Earth. The measured TOF data, sampled at a 20-kS/s rate, and converted to distance, was processed to show a Gaussian white noise floor typically less than 1 cm RMS. This resulted in a precision for relative distance measurements more than two orders-of-magnitude finer than the RF-based navigation and ranging systems used during the LADEE mission. This paper presents an overview of the LLCD TOF system, a summary of the on-orbit measurements, and an analysis of the accuracy of the measured data for the mission.
-
the lunar Laser Communication demonstration nasa s first step toward very high data rate support of science and exploration missions
Space Science Reviews, 2014Co-Authors: Don M Boroson, B S RobinsonAbstract:Future NASA missions for both Science and Exploration will have needs for much higher data rates than are presently available, even with NASA’s highly-capable Space- and Deep-Space Networks. As a first step towards this end, for one month in late 2013, NASA’s Lunar Laser Communication Demonstration (LLCD) successfully demonstrated for the first time high-rate duplex Laser Communications between a satellite in lunar orbit, the Lunar Atmosphere and Dust Environment Explorer (LADEE), and multiple ground stations on the Earth. It constituted the longest-range Laser Communication link ever built and demonstrated the highest Communication data rates ever achieved to or from the Moon.
-
the lunar Laser Communication demonstration nasa s first step toward very high data rate support of science and exploration missions
Springer Netherlands, 2014Co-Authors: Don M Boroson, B S RobinsonAbstract:Future NASA missions for both Science and Exploration will have needs for much higher data rates than are presently available, even with NASA’s highly-capable Space- and Deep-Space Networks. As a first step towards this end, for one month in late 2013, NASA’s Lunar Laser Communication Demonstration (LLCD) successfully demonstrated for the first time high-rate duplex Laser Communications between a satellite in lunar orbit, the Lunar Atmosphere and Dust Environment Explorer (LADEE), and multiple ground stations on the Earth. It constituted the longest-range Laser Communication link ever built and demonstrated the highest Communication data rates ever achieved to or from the Moon.
-
overview and on orbit performance of the lunar Laser Communication demonstration uplink
Conference on Lasers and Electro-Optics, 2014Co-Authors: M L Stevens, Robert E. Lafon, R. T. Schulein, Don M Boroson, B S Robinson, D O Caplan, J J Carney, Laura E Elgin, Steven Constantine, Joseph A GrecoAbstract:We present an implementation overview and demonstrated error-free coded performance over the 400,000-km link between an Earth-based Laser Communication terminal and the LADEE satellite orbiting the moon at 9.72-Mbps and 19.44-Mbps uplink rates.
Morio Toyoshima - One of the best experts on this subject based on the ideXlab platform.
-
satellite to ground optical Communications using small optical transponder sota received power fluctuations
Optics Express, 2017Co-Authors: Dimitar Kolev, Morio ToyoshimaAbstract:In this paper, experimental results related to the received-power fluctuations in a LEO satellite-to-ground Laser-Communication link using the Small Optical TrAnsponder (SOTA) are presented. The data is compared to the theoretical expectations based on the Hufnagel-Valley model. The discrepancies in the results are discussed by spectrum analysis and by a comparison with the Differential Image Motion Monitor (DIMM) measurements of the Fried parameter. Finally, the experimentally-derived coherence time is shown and discussed.
-
Current status of research and development on space Laser Communications technologies and future plans in NICT
2015 IEEE International Conference on Space Optical Systems and Applications (ICSOS), 2015Co-Authors: Morio Toyoshima, Yoshisada Koyama, Tetsuharu Fuse, Dimitar R. Kolev, Hideki Takenaka, Yasushi Munemasa, Naohiko Iwakiri, Kenji Suzuki, Toshihiro Kubooka, Maki AkiokaAbstract:The National Institute of Information and Communications Technology (NICT) has successfully conducted several Laser Communication experiments between geostationary earth orbit (GEO) and low earth orbit (LEO) satellites and optical ground stations. To date other organizations have also conducted many space Laser Communication demonstrations worldwide and the time has come when space Laser Communications can be used as operational systems. The NICT has recently carried out the first-ever successful data transmission from a 50-kg class micro-satellite via Laser Communication links. This paper presents recent activities on space Laser Communications in the NICT including the organization's future plans for next generation space Laser Communication research aiming to achieve 10 Gbps-class and 40 Gpbs-class Laser Communications at GEO and LEO distances.
-
experimental verification of fiber coupling efficiency for satellite to ground atmospheric Laser downlinks
Optics Express, 2012Co-Authors: Hideki Takenaka, Morio Toyoshima, Yoshihisa TakayamaAbstract:Optical Communication is a high-capacity method that can handle considerable satellite data. When common-fiber optical devices such as optical fiber amplifiers based on single mode fibers are used in free-space Laser Communication systems, the Laser beam has to be coupled to a single-mode fiber. Under atmospheric turbulence it would be difficult to make the required fiber coupling efficiency in satellite-to-ground Laser propagation paths. A fast-steering mirror that can operate at high frequencies under atmospheric turbulence is fabricated, and its tracking performance is verified in real satellite-to-ground Laser Communication experiments. The measured fiber coupling loss of 10–19 dB in satellite-to-ground Laser Communication links under atmospheric turbulence shows good agreement with the predicted fiber coupling efficiency of 17 dB.
-
in orbit measurements of spacecraft microvibrations for satellite Laser Communication links
Optical Engineering, 2010Co-Authors: Morio Toyoshima, Yoshihisa Takayama, Hiroo Kunimori, Takashi Jono, Shiro YamakawaAbstract:Angular microvibrations of platform jitter on the optical inter-orbit Communications engineering test satellite are measured in space during ground-to-satellite Laser Communication links. The microaccelerations are measured by the onboard accelerometers at a sampling rate of 2048 Hz. The angular microvibrations are estimated from the measured microaccelerations using the tracking characteristics of the Laser Communications terminal and the conversion factor on the basis of microvibration data obtained from ground-based tests. The power spectral density (PSD) of the satellite microvibrations is analyzed by using the fast Fourier transform analysis and the data length is examined according to the frequency resolution of the PSD. The in-orbit measurements of the PSDs are compared with those obtained from the ground test. The angular microvibrational base motion is estimated and a PSD up to 1024 Hz is additionally provided as a database of the real measurement results with previously obtained in-orbit measurements. The measured results will contribute to the angular jitter estimation and the design of a tracking control loop for space Laser Communication systems in the future.
-
ground to satellite optical link tests between japanese Laser Communications terminal and european geostationary satellite artemis
Proceedings of SPIE, 2004Co-Authors: Morio Toyoshima, Shiro Yamakawa, Zoran Sodnik, Katsuyoshi Arai, Toshihiko Yamawaki, M Reyes, Angel Alonso, Benoit DemelenneAbstract:Optical acquisition, tracking and Communication tests were performed between a Japanese Laser Communications terminal placed within the ESAs optical ground station at Tenerife, Spain and a European optical payload onboard the ARTEMIS satellite in geostationary earth orbit at 21.5° East. The optical Communications tests at Tenerife were to verify the end-to-end optical characteristics such as intensity, sensitivity, wavelength, and polarization, as well as the modulation scheme of optical signals and acquisition sequences of the terminals under fairly good atmospheric conditions. The downlink's bit error rate was on the order of 10 -10 in spite of atmospheric turbulence. Atmospheric turbulence induced signal fading increased the uplink bit error rate, the best value of which was 2.5x10 -5 . The Japanese Laser Communication terminal itself autonomously established and maintained the ground-to-satellite optical link with the ESA's optical payload from the beginning to the end of a 20-minute session. The test results show that the Laser Communication terminal which is to be launched with the Japanese OICETS satellite is optically compatible with the optical Communications payload onboard the European ARTEMIS satellite.
Don M Boroson - One of the best experts on this subject based on the ideXlab platform.
-
the lunar Laser Communication demonstration time of flight measurement system overview on orbit performance and ranging analysis
Proceedings of SPIE, 2016Co-Authors: M L Stevens, M M Willis, B S Robinson, Joseph A Greco, Ronald R Parenti, Farzana I Khatri, Don M BorosonAbstract:The Lunar Laser Communication Demonstration (LLCD) flown on the Lunar Atmosphere and Dust Environment Explorer (LADEE) satellite achieved record uplink and downlink Communication data rates between a satellite orbiting the Moon and an Earth-based ground terminal. In addition, the high-speed signals of the Communication system were used to accurately measure the round-trip time-of-flight (TOF) of signals sent to the Moon and back to the Earth. The measured TOF data, sampled at a 20-kS/s rate, and converted to distance, was processed to show a Gaussian white noise floor typically less than 1 cm RMS. This resulted in a precision for relative distance measurements more than two orders-of-magnitude finer than the RF-based navigation and ranging systems used during the LADEE mission. This paper presents an overview of the LLCD TOF system, a summary of the on-orbit measurements, and an analysis of the accuracy of the measured data for the mission.
-
the lunar Laser Communication demonstration nasa s first step toward very high data rate support of science and exploration missions
Space Science Reviews, 2014Co-Authors: Don M Boroson, B S RobinsonAbstract:Future NASA missions for both Science and Exploration will have needs for much higher data rates than are presently available, even with NASA’s highly-capable Space- and Deep-Space Networks. As a first step towards this end, for one month in late 2013, NASA’s Lunar Laser Communication Demonstration (LLCD) successfully demonstrated for the first time high-rate duplex Laser Communications between a satellite in lunar orbit, the Lunar Atmosphere and Dust Environment Explorer (LADEE), and multiple ground stations on the Earth. It constituted the longest-range Laser Communication link ever built and demonstrated the highest Communication data rates ever achieved to or from the Moon.
-
the lunar Laser Communication demonstration nasa s first step toward very high data rate support of science and exploration missions
Springer Netherlands, 2014Co-Authors: Don M Boroson, B S RobinsonAbstract:Future NASA missions for both Science and Exploration will have needs for much higher data rates than are presently available, even with NASA’s highly-capable Space- and Deep-Space Networks. As a first step towards this end, for one month in late 2013, NASA’s Lunar Laser Communication Demonstration (LLCD) successfully demonstrated for the first time high-rate duplex Laser Communications between a satellite in lunar orbit, the Lunar Atmosphere and Dust Environment Explorer (LADEE), and multiple ground stations on the Earth. It constituted the longest-range Laser Communication link ever built and demonstrated the highest Communication data rates ever achieved to or from the Moon.
-
overview and on orbit performance of the lunar Laser Communication demonstration uplink
Conference on Lasers and Electro-Optics, 2014Co-Authors: M L Stevens, Robert E. Lafon, R. T. Schulein, Don M Boroson, B S Robinson, D O Caplan, J J Carney, Laura E Elgin, Steven Constantine, Joseph A GrecoAbstract:We present an implementation overview and demonstrated error-free coded performance over the 400,000-km link between an Earth-based Laser Communication terminal and the LADEE satellite orbiting the moon at 9.72-Mbps and 19.44-Mbps uplink rates.
Yoshihisa Takayama - One of the best experts on this subject based on the ideXlab platform.
-
experimental verification of fiber coupling efficiency for satellite to ground atmospheric Laser downlinks
Optics Express, 2012Co-Authors: Hideki Takenaka, Morio Toyoshima, Yoshihisa TakayamaAbstract:Optical Communication is a high-capacity method that can handle considerable satellite data. When common-fiber optical devices such as optical fiber amplifiers based on single mode fibers are used in free-space Laser Communication systems, the Laser beam has to be coupled to a single-mode fiber. Under atmospheric turbulence it would be difficult to make the required fiber coupling efficiency in satellite-to-ground Laser propagation paths. A fast-steering mirror that can operate at high frequencies under atmospheric turbulence is fabricated, and its tracking performance is verified in real satellite-to-ground Laser Communication experiments. The measured fiber coupling loss of 10–19 dB in satellite-to-ground Laser Communication links under atmospheric turbulence shows good agreement with the predicted fiber coupling efficiency of 17 dB.
-
in orbit measurements of spacecraft microvibrations for satellite Laser Communication links
Optical Engineering, 2010Co-Authors: Morio Toyoshima, Yoshihisa Takayama, Hiroo Kunimori, Takashi Jono, Shiro YamakawaAbstract:Angular microvibrations of platform jitter on the optical inter-orbit Communications engineering test satellite are measured in space during ground-to-satellite Laser Communication links. The microaccelerations are measured by the onboard accelerometers at a sampling rate of 2048 Hz. The angular microvibrations are estimated from the measured microaccelerations using the tracking characteristics of the Laser Communications terminal and the conversion factor on the basis of microvibration data obtained from ground-based tests. The power spectral density (PSD) of the satellite microvibrations is analyzed by using the fast Fourier transform analysis and the data length is examined according to the frequency resolution of the PSD. The in-orbit measurements of the PSDs are compared with those obtained from the ground test. The angular microvibrational base motion is estimated and a PSD up to 1024 Hz is additionally provided as a database of the real measurement results with previously obtained in-orbit measurements. The measured results will contribute to the angular jitter estimation and the design of a tracking control loop for space Laser Communication systems in the future.
-
observation of atmospheric influence on oicets inter orbit Laser Communication demonstrations
Proceedings of SPIE, 2007Co-Authors: Yoshihisa Takayama, Takashi Jono, Koichi Shiratama, Yoshisada Koyama, Nobuhiro Kura, Benoit Demelenne, Zoran Sodnik, A Bird, Katsuyoshi AraiAbstract:The experimental results of an inter-orbit Laser Communication performed under an atmospheric influence is presented. The demonstration was planned so that the optical link was supposed to graze the earth's rim because of the satellite revolution around the earth. The trial was successfully carried out on 5th April, 2006. The measured experimental data are introduced to show the temporal behavior of the OICETS's optical terminal. The atmospheric influence on the optical link is calculated with a theoretical model to obtain a probability density of normalized intensity as a predictive value. The probability density is also estimated from the experimentally measured data. The comparison shows that the theoretical prediction well describes the experimental results.
Gang Wang - One of the best experts on this subject based on the ideXlab platform.
-
free space Laser Communication system with rapid acquisition based on astronomical telescopes
Optics Express, 2015Co-Authors: Jianmin Wang, Guang Zhao, Gang WangAbstract:The general structure of a free-space optical (FSO) Communication system based on astronomical telescopes is proposed. The light path for astronomical observation and for Communication can be easily switched. A separate camera is used as a star sensor to determine the pointing direction of the optical terminal’s antenna. The new system exhibits rapid acquisition and is widely applicable in various astronomical telescope systems and wavelengths. We present a detailed analysis of the acquisition time, which can be decreased by one order of magnitude compared with traditional optical Communication systems. Furthermore, we verify software algorithms and tracking accuracy.
