Artificial vision assisted ground fine pointing system for experimental optical link for CubeSat communications

Medina, I.; Hernández-Gómez, J. J.; Miguel, Christopher René Torres-San; Couder-Castañeda, Carlos; Orozco-del-Castillo, Mauricio Gabriel; Grageda-Arellano, Jesús Irán

doi:10.1088/1742-6596/1221/1/012063

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…In this work, a LEO [14,15] of 350 km is considered. Thus, the instantaneous velocity of the satellite is approximately 28,000 km/h, its orbital period will be approximately 90 minutes and it will have a line of sight time of approximately 4 minutes [16]. Also, the constant change of the zenith angle for pointing, causes the link to cross different sections of the atmosphere, which can cause large fluctuations in signal quality, with the most severe fluctuations occurring at steeper angles [17][18][19].…”

Section: Elements Of the Satellite Optical Systemmentioning

confidence: 99%

Impact of atmospheric turbulence on OOK and BPSK modulations for satcom optical uplink

Medina,

Hernández-Gómez,

Couder-Castañeda

2024

Telecommun Syst

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The constant growth in the demand for communication services has implied an increase in the amount of information that needs to be transmitted, a situation that has led to the development of new technologies for the manipulation of information. Optical satellite communications have provided a solution to this problem, allowing to increase exponentially the transfer rate between the ground station and an in orbit satellite. However, although this technology offers numerous advantages, such as higher bandwidth, lower power consumption, narrower beam width, as well as greater simplicity of development, it is highly dependent on atmospheric conditions, since the transmitted optical power is seriously affected by absorption and scattering phenomena, as well as by variations in the refractive index of the atmosphere due to temperature and humidity variations, among others. In this work, optical power fluctuations are modelled by means of a Gamma-Gamma optical turbulence model, so strong turbulence conditions are established according to Rytov's turbulence theory, considering a measure of the intensity of the optical turbulence when extended to strong fluctuation conditions. Finally, the performance evaluation of BPSK and OOK modulation schemes for conditions with variations of satellite height, pointing angle, based on atmospheric attenuation, signal scattering and absorption is given. The results show better performance of the modulation schemes at low zenith pointing angles and large wavelengths (up to the short-wavelength IR). Moreover, BPSK modulation shows to be able to provide lower bit error (BER) values for a given signal-to-noise ratio, outperforming OOK modulation scheme in this sense.

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Section: Elements Of the Satellite Optical Systemmentioning

confidence: 99%

Impact of atmospheric turbulence on OOK and BPSK modulations for satcom optical uplink

Medina,

Hernández-Gómez,

Couder-Castañeda

2024

Telecommun Syst

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“…However, such data rates are insufficient for the increasing demands of the market. In this sense, lasercom is a promising option over RF [7], as it has proved to be able to deliver data rates higher than 5 Gbps in a free channel [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, due to the divergence of lasers used for FSO, a circular area of 8.5 km is required to establish a communication link via optical [10] (altitude of 350 km [13]), yielding a precision of 0.25° for the alignment of devices, to achieve a 50 Mbps consistent data rate for a LEO-OGS link [9,10]. Artificial vision systems (AVSs) may take an important role in the detection of OGS from in orbit satellites, or viceversa.…”

Section: Introductionmentioning

confidence: 99%

Artificial vision algorithm for earth station location from CubeSats in narrow beam optical communications

Medina

Santiago

Hernández-Gómez

et al. 2022

J. Phys.: Conf. Ser.

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The use of CubeSats promises several advantages within a low economical budget margin for different missions. Nowadays, data transfer through optical channels (lasercom) is considered a potential technology for satellite wireless communications, providing several advantages in terms of data transfer rate with lower energy consumption. However, a main drawback is the location of the Optical Ground Station (OGS). Therefore, an artificial vision algorithm for the processing of images captured by the camera of a CubeSat is proposed in this work, in order to carry out the identification and recognition of an OGS by means of a beacon signal, to aid the Pointing, Acquisition and Tracking (PAT) onboard subsystem for the communication’s stage.

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“…One of the main limitations of CubeSats are the impossibility of being equipped with payloads to obtain high resolution real-time video due to their very limited RF communications bandwidths [16]. The evident solution is to implement video compression algorithms to dramatically reduce the size of transmitted information, which is unfeasible because algorithms to highly compress video are of very high processing burden [10].…”

Section: High Efficiency Video Compression (Hevc)mentioning

confidence: 99%

“…Artificial Vision allows the transformation images in to numerical and symbolic data for their further processing. In [24,16], an on-board artificial vision system able to locate an Earth's reference point by taking a picture of a laser beam pointing directly to the CubeSat is proposed. This, as part of a PAT (Pointing, Acquisition and Tracking) system [23], to establish an optical laser-based high-bandwidth communications system.…”

Section: Artificial Laser-based Vision (Alv)mentioning

confidence: 99%

Conceptual low-cost on-board high performance computing in CubeSat nanosatellites for pattern recognition in Earth's remote sensing

Hernández-Gómez¹,

Yañez-Casas²,

Torres-Lara³

et al.

Kalpa Publications in Computing

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Nowadays, remote sensing data taken from artificial satellites require high space com- munications bandwidths as well as high computational processing burdens due to the vertiginous development and specialisation of on-board payloads specifically designed for remote sensing purposes. Nevertheless, these factors become a severe problem when con- sidering nanosatellites, particularly those based in the CubeSat standard, due to the strong limitations that it imposes in volume, power and mass. Thus, the applications of remote sensing in this class of satellites, widely sought due to their affordable cost and easiness of construction and deployment, are very restricted due to their very limited on-board computer power, notwithstanding their Low Earth Orbits (LEO) which make them ideal for Earth’s remote sensing. In this work we present the feasibility of the integration of an NVIDIA GPU of low mass and power as the on-board computer for 1-3U CubeSats. From the remote sensing point of view, we present nine processing-intensive algorithms very commonly used for the processing of remote sensing data which can be executed on-board on this platform. In this sense, we present the performance of these algorithms on the proposed on-board computer with respect with a typical on-board computer for CubeSats (ARM Cortex-A57 MP Core Processor), showing that they have acceleration factors of average of 14.04× ∼14.72× in average. This study sets the precedent to perform satellite on-board high performance computing so to widen the remote sensing capabilities of CubeSats.

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Artificial vision assisted ground fine pointing system for experimental optical link for CubeSat communications

Cited by 4 publications

References 10 publications

Impact of atmospheric turbulence on OOK and BPSK modulations for satcom optical uplink

Impact of atmospheric turbulence on OOK and BPSK modulations for satcom optical uplink

Artificial vision algorithm for earth station location from CubeSats in narrow beam optical communications

Conceptual low-cost on-board high performance computing in CubeSat nanosatellites for pattern recognition in Earth's remote sensing

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