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Journal ArticleDOI

Performance Improvement of the Tracking System of a Satellite Laser Communication

31 Jul 2011-International Journal of Computer Applications (Foundation of Computer Science (FCS))-Vol. 26, Iss: 6, pp 19-25
TL;DR: The feed-forward vibration compensation model is introduced by introducing PID controller and results indicate that the proposed method minimizes the vibration effects and hence reduces BER in satellite laser communication system.
Abstract: Free Space Optics (FSO) is an optical communication technology that uses light propagating in free space to transmit data between two points. The technology is useful where the physical connections by the means of optical fibre cables are impractical to use due to high costs or other considerations. FSO has been proposed by using a laser. FSO is considered as one of the most popular choices for inter-satellite communication where the performance is limited by “satellite vibration”. FSO cannot achieve a stable and ‘healthy’ link due to such type of vibration. The ultimate disadvantages include misalignment in tracking, signal attenuation and high BER (bit error rate). Hence the satellite vibrations need to be compensated (or minimized). This paper introduces the feed-forward vibration compensation model by introducing PID controller. The simulation results indicate that the proposed method minimizes the vibration effects and hence reduces BER in satellite laser communication system [7]. General Terms Satellite, Vibration effect, PID controller, Feed-forward compensator.

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Citations
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Journal Article
TL;DR: In this paper, the impact of pointing and tracking errors on the design of direct-detection PPM and heterodyne non-coherent frequency-shift keying (NCFSK) systems is analyzed in terms of constraints on the antenna size and the power penalty incurred.
Abstract: Given the RMS transmitter pointing error and the desired probability of bit error (PBE), it can be shown that an optimal transmitter antenna gain exists which minimizes the required transmitter power. Given the RMS local oscillator tracking error, an optimum receiver antenna gain can be found which optimizes the receiver performance. The impact of pointing and tracking errors on the design of direct-detection pulse-position modulation (PPM) and heterodyne noncoherent frequency-shift keying (NCFSK) systems is then analyzed in terms of constraints on the antenna size and the power penalty incurred. It is shown that in the limit of large spatial tracking errors, the advantage in receiver sensitivity for the heterodyne system is quickly offset by the smaller antenna gain and the higher power penalty due to tracking errors. In contrast, for systems with small spatial tracking errors, the heterodyne system is superior because of the higher receiver sensitivity. >

18 citations

Proceedings ArticleDOI
15 Mar 2012
TL;DR: In this article, the effect of satellite vibration on various parameters like pointing angle, received signal power and hence the BER of the system are studied and plotted using Matlab simulation.
Abstract: Laser communication links in space are attractive alternatives to present day microwave links. Space communications as employed in satellite to satellite link is traditionally performed using microwaves. High capacity intersatellite communication crosslinks will permit more efficient and more reliable operation of future satellite systems. The mass, power consumption and size of optical transceiver module will be smaller than that of a microwave transceiver. On the other hand, inter-satellite communication is limited by “satellite vibration”. The ultimate disadvantages include misalignment in tracking, signal attenuation and high BER (bit error rate). In this paper, effect of satellite vibration on various parameters like pointing angle, received signal power and hence the BER of the system are studied and plotted using Matlab simulation.

11 citations

Journal ArticleDOI
TL;DR: A new smart antenna system where automation is initiated when the transceivers receive low signal strength and report the finding to processing comparator unit is proposed and could achieve optimal directivity for desired RSL with low overshoot and fast steady state response.

7 citations


Cites methods from "Performance Improvement of the Trac..."

  • ...in 2011 [16] has worked regarding the tracking system improvement for satellite laser communication, where they have used PID controller to improve system performance on tracking...

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References
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Book
01 May 1995
TL;DR: Past, present, and future architecture and applications system design methodology optical design the communication receiver the acquisition receiver the tracking receiver key technologies configuring the system trading RF and laser communications for system size, weight, and power trends in laser crosslinks laser communications applications.
Abstract: Past, present, and future architecture and applications system design methodology optical design the communication receiver the acquisition receiver the tracking receiver key technologies configuring the system trading RF and laser communications for your system size, weight, and power trends in laser crosslinks laser communications applications.

178 citations

Journal ArticleDOI
TL;DR: The impact of pointing and tracking errors on the design of direct-detection pulse-position modulation and heterodyne noncoherent frequency-shift keying systems is analyzed and it is shown that in the limit of large spatial tracking errors, the advantage in receiver sensitivity for theheterodyne system is quickly offset by the smaller antenna gain and the higher power penalty due to tracking errors.
Abstract: Given the RMS transmitter pointing error and the desired probability of bit error (PBE), it can be shown that an optimal transmitter antenna gain exists which minimizes the required transmitter power. Given the RMS local oscillator tracking error, an optimum receiver antenna gain can be found which optimizes the receiver performance. The impact of pointing and tracking errors on the design of direct-detection pulse-position modulation (PPM) and heterodyne noncoherent frequency-shift keying (NCFSK) systems is then analyzed in terms of constraints on the antenna size and the power penalty incurred. It is shown that in the limit of large spatial tracking errors, the advantage in receiver sensitivity for the heterodyne system is quickly offset by the smaller antenna gain and the higher power penalty due to tracking errors. In contrast, for systems with small spatial tracking errors, the heterodyne system is superior because of the higher receiver sensitivity. >

173 citations


"Performance Improvement of the Trac..." refers methods in this paper

  • ...As it is indicated by the Rayleigh model that the azimuth and elevation tracking processes are independent and identically distributed, so that the radial pointing error [13-16] may be expressed by the following pdf (probability density function) [4]( ) = ....

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Journal ArticleDOI
01 Oct 1997
TL;DR: This paper reviews the present status of satellite networks, the developing efforts of optical satellite communication around the world, performance results of vibration effects on different kinds of optical communication satellite Networks, and seven approaches to overcome the problems caused by transmitter pointing vibration.
Abstract: A number of serious consortiums develop satellite communication networks. The objective of these communication projects is to service personal communication users almost everywhere on Earth. The intersatellite links in those projects use microwave radiation as the carrier. Free-space optical communication between satellites networked together can make possible high-speed communication between different places on Earth. Some advantages of an optical communication system over a microwave communication system in free space are: (1) smaller size and weight, (2) less transmitter power, (3) larger bandwidth, and (4) higher immunity to interference. The pointing from one satellite to another is a complicated problem due to the large distance between the satellite, the narrow beam divergence angle, and vibration of the pointing system. Such vibration of the transmitted beam in the receiver plane decreases the average received signal, which increases the bit error rate. We review: (1) the present status of satellite networks, (2) developing efforts of optical satellite communication around the world, (3) performance results of vibration effects on different kinds of optical communication satellite networks, and (4) seven approaches to overcome the problems caused by transmitter pointing vibration.

123 citations

Journal ArticleDOI
TL;DR: The average bit error rate (BER) of optical communication systems is considered in the presence of randomangular jitter and the optimum ratio of the divergence angle of the laser beam to the random angular jitter at the desired BER is obtained.
Abstract: The average bit error rate (BER) of optical communication systems is considered in the presence of random angular jitter. First, the received power and the BER in the absence of jitter are reviewed. Then the average BER is obtained in the presence of circularly symmetric, normally distributed jitter by using the probability density function of the optical signal. By minimizing the power penalty for average BER, the optimum ratio of the divergence angle of the laser beam to the random angular jitter at the desired BER is obtained. An analytic approximation of the optimum ratio is derived as a function of the desired average BER. The results can be used for designing the link budget of optical communication and tracking channels in the presence of jitter.

99 citations


"Performance Improvement of the Trac..." refers background or methods in this paper

  • ...[4] Morio Toyoshima, Takashi Jono, Keizo Nakagawa and Akio Yamamoto, “Optimum Divergence Angle of a Gaussian Beam Wave in the Presence of Random Jitter in Free-space Laser Communication Systems” ,Journal of Optics Society of America, 2002, 19 (3): 567-571....

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  • ...As it is indicated by the Rayleigh model that the azimuth and elevation tracking processes are independent and identically distributed, so that the radial pointing error [13-16] may be expressed by the following pdf (probability density function) [4]( ) = ....

    [...]

Proceedings ArticleDOI
01 Jul 1990
TL;DR: In this paper, a set of three orthogonally arranged microaccelerometers is installed on a large communication satellite OLYMPUS to characterize and observe the behavior of different mechanisms in space and to get measurements of the vibration levels which are of relevance for the design of optical communication payloads.
Abstract: On ESA's large communication satellite OLYMPUS a set of three orthogonally arranged microaccelerometers is installed. The aim of this experiment is to characterize and observe the behaviour of the different mechanisms in space and to get measurements of the vibration levels which are of relevance for the design of optical communication payloads. During the commissioning phase of the spacecraft in October 1989 a lot of data recordings were made at ESTEC. The translation of the measured acceleration spectra into a base motion spectra shows a higher amount of vibration in the frequency region above 100 Hz, when compared with previously reported data from Landsat spacecraft. The main disturbing vibration sources, solar array drive and thruster firing, can not be characterized precisely enough before the launch. This confirms that measurements in space are mandatory before flying an optical payload. Therefore ESA plans to install this kind of equipment on several other spacecrafts which will be launched before launch of ESA's optical communication payload SILEX. In this paper the equipment on board OLYMPUS will be described followed by presentation of typical measured data. A specification for the micro-vibration environment with which an optical payload has to cope is then derived.

87 citations


"Performance Improvement of the Trac..." refers background in this paper

  • ...To ensure correct reception of this very narrow beam the receiver needs to be perfectly aligned with the transmitter [11-12]....

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