Localization of a Micro AUV with Dynamic Trilateration Using Low-power Packet Radio RSSI

Communication radio-based AUV localization was demonstrated in this study. The proposed solution was formulated and derived for both stationary and linearly drifting objects of interest and is possible of operating in GNSS-denied operations. Linear curve-fit to experimental data for radio-distance mapping with range calculation was tested in terrestrial and marine environments. The use of packet radio equipment on a secondary basis for localization may present a potential for reduced requirements for high precision or task-specific hardware in the future.

Adaptation of Winlink 2000 Emergency Amateur Radio Email Network to a VHF Packet Radio Infrastructure

This chapter presents software and hardware solutions for interconnecting an existing VHF amateur packet radio infrastructure with ‘Winlink 2000' radio email network. Having in mind that a number of households, schools, and offices are equipped with Internet connections, and that many radio amateurs at such locations are active on their VHF (or UHF) digital networks on a daily basis, the connectivity between the two systems will increase the chances for citizens who suffer after disasters such as earthquakes, heavy rains and floods, followed by malfunction in commercial communicating services – to remain electronically wired with the rest of world by email. The chapter provides a tutorial on constructing, installing, and testing a simple packet radio repeater station, additionally equipped with computer programs with ‘Winlink 2000' compatibility.

Low-Cost and Ultra-Low-Power Consuming RTUs for Use in IoT Systems

This paper presents the design and realization of low-cost and ultra-low-power consuming remote transfer units (RTUs), working as communication gateways for collecting, aggregating, and forwarding IoT data to information centers (servers) in the cloud for further processing and data mining. Two types of RTUs, targeting different application scenarios and utilizing different communication standards, were designed – one, based on the General Packet Radio Service (GPRS) standard, and another – on the NarrowBand Internet of Things (NB-IoT) standard. The developed RTUs were experimentally tested and their use was successfully demonstrated in different IoT systems.

A Performance Analysis of General Packet Radio Service (GPRS) and Narrowband Internet of Things (NB-IoT) in Indonesia

Internet of Things (IoT) refers to a concept connecting any devices onto the internet. The IoT devices cannot only use a service or server to be controlled at a distance but also to do computation. IoT has been applied in many fields, such as smart cities, industries, and logistics. The sending of IoT data can use the existing GSM networks such as GPRS. However, GPRS is not dedicated particularly to the transmission of IoT data in consideration of its weaknesses in terms of coverage and power efficiency. To increase the performance of the transmission of IoT data, Narrowband-IoT (NB-IoT), one alternative to replace GPRS, is offered for its excellence in coverage and power. This paper aims to compare the GPRS and NB-IoT technology for the transmission of IoT data, specifically in Bandung region, Indonesia. The results obtained showed that the packet loss from clients for the GPRS network was at 68%, while the one for NB-IoT was at 44%. Moreover, NB-IoT technology was found excellent in terms of battery saving compared to GPRS for the transmission of IoT data. This result showed that NB-IoT was found more suitable for transmitting the IoT data compared to GPRS.

Conceptual Model of HF-Band Packet Radio Network Control System

The author develop the conceptual control system model to ensure the sustainable projected promising packet radio network HF-band operating. It is proposed to implement the control functions at the Element Management System level on the basis of automated radio centers, and to implement the Network Management System level management functions on the basis of a dedicated server. Such a management approach allows you to build a hierarchical centralized radio network management system architecture. We can observe a simulation modeling for the developed algorithms of the selected radio network control functions. The paper presents the simulation results, namely probabilistic-temporal characteristics of the processes reliability, routing and functioning under attacks.