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Point-ahead analysis and pre-pointing link stability study of intersatellite laser communication

Zhang Fu-Rui, Han Jun-Feng, Ruan Ping

Optica Applicata

2020

Vol. 50, nr 1

111--126

The static bias error angle obviously affects pre-pointing links’ stability in the presence of vibration in intersatellite laser communication. The 2nd order point-ahead angle is a source of misalignment which was ignored in most solutions, and this is the concern of our paper. In this study, we present a further analytical investigation into the point-ahead angle in complex satellite maneuvering environment. Static bias error angle induced by the 2nd order point-ahead angle has been studied under different intersatellite links. The probability density function of the pre-pointing links’ outage has been derived in the presence of pointing jitter taking consideration of the static bias angle, and the link budget has also been analyzed. Simulation model of link stability has been established to verify the numerical results by the Monte Carlo method in Matlab-Simulink environment. The results have shown that the 2nd order point-ahead angle has a significant detrimental impact on link stability in long distance links. It is a neglectable factor. This work is dedicated to intersatellite laser communication system design.

Method for link stability evaluation ofiIndustrial wireless sensor networks (ISA 100.11a)

Florencio Heitor, Dória Neto Adrião

Przegląd Elektrotechniczny

2019

R. 95, nr 11

176--183

IndustrialWirelessSensorNetworks(IWSNs)havebeenconsideredasansolutionformeasurementandcontrolofindustrialprocessesthat have deﬁciencies in the infrastructure of wired networks. The ﬂexibility and allocation of measurement points in locations inaccessible to the operator are the main arguments for integration of wired and wireless instrumentation. Nonetheless, deployment of wireless communication systems presents several problems due to the environment exposed to different types of interference. A way to address this issue is to evaluate the performance of the network through attributes of the communication links. In this work, we propose a method based on the strength signal parameters and the packet delivery rate to evaluate the link stability of IWSN. The proposed strategy considers that received signal strength (RSS) variation and the cumulative packetdeliveryratevaluedeﬁneslinkperformance. Twoscenarioswereselected,amongthe15testsperformedwithISA100.11anetworks,topresent the results of the method. The results show that the link stability factor generated by the proposed method is able to identify instabilities in the link, enabling the evaluation of network performance.

W artykule analizowano możliwość zastosowania bezprzewodowej Sieci czujników WSNS do pomiaru i sterowania procesów przemysłowych w warunkach gdy zastosowanie sieci przewodowej jest utrudnione. Analizowano najkorzystniejsze usytuowanie punktów pomiarowych. Zaproponowano metodę uwzględniającą siłę sygnału. Zbadano dwa scenariusze wykorzystujące sieć ISA 100.11a.