2,275 research outputs found
Intelligent Wireless Sensor Network using Low Space free space optical communication sensor networks
The free space optical communication sensor networks (FSOSN) have shown impending, for very low power, energy aware applications. They aptitude increasing node functionality, lower energy consumption, lower cost and smaller sizes. However, the new wireless sensor network architecture yields new challenges. FSO can be explained by the means to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain broadband communications over distances of several kilometers. The main constraint of FSO is the requirement that a direct line-of-sight (LOS) path exist between two parties the sender and a receiver. However FSO networks offer several unique advantages over RF networks. The fact that include by FSO that it avoids interference with existing RF communications infrastructure is competitively deployed since there is no government licensing of scarce spectrum required, is not susceptible to ?jamming? attacks, and provides a convenient bridge between the sensor network and the nearest optical fiber. The main aim of this research is to develop a low power free space optical communication based intelligent wireless sensor network on 8-bit microcontroller which enables integration of existing devices easily using off the shelf components
Survey of Inter-satellite Communication for Small Satellite Systems: Physical Layer to Network Layer View
Small satellite systems enable whole new class of missions for navigation,
communications, remote sensing and scientific research for both civilian and
military purposes. As individual spacecraft are limited by the size, mass and
power constraints, mass-produced small satellites in large constellations or
clusters could be useful in many science missions such as gravity mapping,
tracking of forest fires, finding water resources, etc. Constellation of
satellites provide improved spatial and temporal resolution of the target.
Small satellite constellations contribute innovative applications by replacing
a single asset with several very capable spacecraft which opens the door to new
applications. With increasing levels of autonomy, there will be a need for
remote communication networks to enable communication between spacecraft. These
space based networks will need to configure and maintain dynamic routes, manage
intermediate nodes, and reconfigure themselves to achieve mission objectives.
Hence, inter-satellite communication is a key aspect when satellites fly in
formation. In this paper, we present the various researches being conducted in
the small satellite community for implementing inter-satellite communications
based on the Open System Interconnection (OSI) model. This paper also reviews
the various design parameters applicable to the first three layers of the OSI
model, i.e., physical, data link and network layer. Based on the survey, we
also present a comprehensive list of design parameters useful for achieving
inter-satellite communications for multiple small satellite missions. Specific
topics include proposed solutions for some of the challenges faced by small
satellite systems, enabling operations using a network of small satellites, and
some examples of small satellite missions involving formation flying aspects.Comment: 51 pages, 21 Figures, 11 Tables, accepted in IEEE Communications
Surveys and Tutorial
Starling1: Swarm Technology Demonstration
The Starling series of demonstration missions will test technologies required to achieve affordable, distributed spacecraft (“swarm”) missions that: are scalable to at least 100 spacecraft for applications that include synchronized multipoint measurements; involve closely coordinated ensembles of two or more spacecraft operating as a single unit for interferometric, synthetic aperture, or similar sensor architectures; or use autonomous or semi-autonomous operation of multiple spacecraft functioning as a unit to achieve science or other mission objectives with low-cost small spacecraft. Starling1 will focus on developing technologies that enable scalability and deep space application. The mission goals include the demonstration of a Mobile Ad-hoc NETwork (MANET) through an in-space communication experiment and vision based relative navigation through the Starling Formation-flying Optical eXperiment (StarFOX)
SDT: A Low-cost and Topology-reconfigurable Testbed for Network Research
Network experiments are essential to network-related scientific research
(e.g., congestion control, QoS, network topology design, and traffic
engineering). However, (re)configuring various topologies on a real testbed is
expensive, time-consuming, and error-prone. In this paper, we propose
\emph{Software Defined Topology Testbed (SDT)}, a method for constructing a
user-defined network topology using a few commodity switches. SDT is low-cost,
deployment-friendly, and reconfigurable, which can run multiple sets of
experiments under different topologies by simply using different topology
configuration files at the controller we designed. We implement a prototype of
SDT and conduct numerous experiments. Evaluations show that SDT only introduces
at most 2\% extra overhead than full testbeds on multi-hop latency and is far
more efficient than software simulators (reducing the evaluation time by up to
2899x). SDT is more cost-effective and scalable than existing Topology
Projection (TP) solutions. Further experiments show that SDT can support
various network research experiments at a low cost on topics including but not
limited to topology design, congestion control, and traffic engineering.Comment: This paper will be published in IEEE CLUSTER 2023. Preview version
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