China
Africa
Explore chapters and articles related to this topic
Emerging Technologies and Associated Terminologies
Published in Amalendu Chatterjee, Autonomous and Integrated Parking and Transportation Services, 2019
RF Beacon is a transceiver device (mostly transmitter) usually located in geostationary and inclined satellites. Such devices receive or transmit continuous or periodic radio signals containing limited data on a specified radio frequency. The purpose of these electric or electromagnetic beacons is to broadcast their fixed location so that direction-finding systems (radio operated) on ships, aircrafts, and vehicles can determine the bearing to the beacon. The transmitting function relate to telemetry data and meteorological information. These beacons are also named with specific applications such as space and satellite radio beacons, driftnetbuoy radio beacon, distress/emergency beacons, and much more.24 In addition of air and sea navigation, RF beacon has applications in propagation research, robotic mapping, radio frequency identification, and indoor guidance, as with real-time locating systems (RTLS) like Syledis. In fact, any AM, VHF, or UHF radio transmitter can be used as a beacon for a direction-finding system. The principle is applicable to infrared and sonar beacons as well. Limited use of these devices has occurred in parking services and more use is expected in the integrated RWPTTP infrastructure.
Radio Location, Radio Navigation, and GPS Systems
Published in John G. Webster, Halit Eren, Measurement, Instrumentation, and Sensors Handbook, 2017
Essentially, radio beacons are single transmitters, transmitting a continuous wave at low power, usually modulated by audible Morse code characters for identification. The transmitted signal is received by an on-board receiver incorporating a radio direction finder (RDF) to be processed further.
Graph-based network generation and CCTV processing techniques for fire evacuation
Published in Building Research & Information, 2021
Jack C. P. Cheng, Keyu Chen, Peter Kok-Yiu Wong, Weiwei Chen, Chun Ting Li
With the development of mobile devices, mobile navigation systems that can be used during fire emergency have emerged. These mobile navigation systems have greatly improved the efficiency in positioning and navigation compared with the conventional fire evacuation diagrams. Wireless sensor networks have been widely applied to emergency evacuation navigation (Barnes et al., 2007; Li et al., 2009; Tseng et al., 2006). The sensors of the networks can be used not only for tracking a user’s real-time location, but also as nodes for path planning. Real-time location information and evacuation paths can be displayed on common mobile phones for evacuees’ quick response. Inoue et al. (2008) developed a mobile system which had a normal navigation mode and an emergency navigation mode. The navigation system utilized radio beacon devices to estimate users’ positions and could provide a navigation path accordingly. Becker et al. (2009) proposed a multilayered space-event model for indoor navigation which was exemplified within a fire escape scenario. Goodwin et al. (2015) implemented Ant Colony Optimization in a realistic fire dynamics simulator for escape path planning. Fischer and Gellersen (2009) conducted a study which introduced relevant commercial products, as well as some research prototypes designed for emergency evacuation navigation.