Design and Implementation of a Narrow-Band Intersatellite Network with Limited Onboard Resources for IoT

Satellite networks are inevitable for the ubiquitous connectivity of M2M (machine to machine) and IoT (internet of things) devices. Advances in the miniaturization of satellite technology make networks in LEO (Low Earth Orbit) predestined to serve as a backhaul for narrow-band M2M communication. To reduce latency and increase network responsivity, intersatellite link capability among nodes is a key component in satellite design. The miniaturization of nodes to enable the economical deployment of large networks is also crucial. Thus, this article addresses these key issues and presents a design methodology and implementation of an adaptive network architecture considering highly limited resources, as is the case in a nanosatellite (≈10 kg) network. Potentially applicable multiple access techniques are evaluated. The results show that a time division duplex scheme with session-oriented P2P (point to point) protocols in the data link layer is more suitable for limited resources. Furthermore, an applicable layer model is defined and a protocol implementation is outlined. To demonstrate the technical feasibility of a nanosatellite-based communication network, the S-NET (S band network with nanosatellites) mission has been developed, which consists of four nanosatellites, to demonstrate multi-point crosslink with 100 kbps data rates over distances up to 400 km and optimized communication protocols, pushing the technological boundaries of nanosatellites. The flight results of S-NET prove the feasibility of these nanosatellites as a space-based M2M backhaul.BMWi, 50YB1225, S-Band Netzwerk für kooperierende SatellitenBMWi, 50YB1009, SLink - S-Band Transceiver zur Intersatelliten-Kommunikation von NanosatellitenDFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berli

Early Forest Fire Detection Using Radio-Acoustic Sounding System

Automated early fire detection systems have recently received a significant amount of attention due to their importance in protecting the global environment. Some emergent technologies such as ground-based, satellite-based remote sensing and distributed sensor networks systems have been used to detect forest fires in the early stages. In this study, a radio-acoustic sounding system with fine space and time resolution capabilities for continuous monitoring and early detection of forest fires is proposed. Simulations show that remote thermal mapping of a particular forest region by the proposed system could be a potential solution to the problem of early detection of forest fires

SMASS – A Lightweight Satellite Simulation Framework for Concurrent Engineering in Education

The “Satellite Mission Analysis and Simulation System” (SMASS) for small satellites developed at the Technical University Berlin (TU Berlin) is mainly used in the education of aerospace students at universities with the focus on understanding the relations between system parameters [1]. The design of a satellite with SMASS is based on the dynamic simulation of entire mission scenarios, which goes beyond the classical approach of designing and simulating uncoupled subsystems with static dependencies. However, after a detailed analysis of SMASS, it turned out that it is highly recommended to re-engineer SMASS to make it flexible for future extensions. The goal was to develop a new highly modular structure. After an introduction, this paper presents the basic layer structure of the new modular SMASS framework. In the next sections, the different layers are explained. This includes their functions and the connections between them. In the end, an example explains the new feature of comparing different satellite configurations using only one simulation run

Schilderungen aus dem Prerauer Ghettoleben vom Jahre 1838 - 1848 : mit Streiflichtern bis in die Gegenwart und Jugenderinnerungen eines 78jährigen

von Ignaz Bries

Le prétendu Πομπαῖος Στρατηγός

Briess E.-Ed. Le prétendu Πομπαῖος Στρατηγός. In: Revue des Études Grecques, tome 26, fascicule 116,1913. pp. 47-52