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Green Wireless Communication Systems
Published in Gurjit Kaur, Akanksha Srivastava, Green Communication Technologies for Future Networks, 2023
Akanksha Srivastava, Gurjit Kaur
Radio broadcasting is a well-known type of wireless transmission. Radio transmitters use radio waves to transmit information. Radio waves are comparatively narrow, and they can be transmitted over different frequencies. Therefore, a car radio is capable of receiving radio signals from various radio stations. Figure 2.5 shows the scenario of infrared communication.
Ground-Based Interferometer radars for load tests of long-span arch bridges. Case study: Almonte and El Tajo Viaducts, Extremadura, Spain
Published in Joan-Ramon Casas, Dan M. Frangopol, Jose Turmo, Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 2022
A. Rodríguez, J.V. Fuente, R. Fabregad, J.A. Álvarez, R. Chacón, C. Ramonell
RADAR is a short form for Radio Detection and Ranging systems. The basic working principle of all the radio systems is the same. The radio uses a transmitter to produce an electromagnetic signal that is then propagated into the space using an antenna. When this signal strikes an object, it gets reflected back, and this reflected signal is known to be the echo signal. When the antenna detects the echo signal, it gets fed into the receiver. The receiver then processes the echoed signal to get useful data out of it. Signals are often noise filtered. The output from the receiver passes to user-defined threshold decision systems.
Air Interface Performance and User Experience Improvement
Published in Rihai Wu, Xun Yang, Xia Zhou, Yibo Wang, Enterprise Wireless Local Area Network Architectures and Technologies, 2021
Rihai Wu, Xun Yang, Xia Zhou, Yibo Wang
Antennas are a category of devices used to send or receive radio waves in broadcast, television, point-to-point radio communications, radar, space exploration, and many other systems. Antennas work in the air, in outer space, underwater, or even in soil and rocks. In the physical science, an antenna is the combination of one or more conductors that produce electromagnetic fields as a result of applied time-varying voltages or currents, or yield time-varying currents as a result of induction in electromagnetic fields and provide time-varying voltages at the output end.
Requirements and challenges for infusion of SHM systems within Digital Twin platforms
Published in Structure and Infrastructure Engineering, 2023
Rolando Chacón, Joan R. Casas, Carlos Ramonell, Hector Posada, Irina Stipanovic, Sandra Škarić
Another technique is RADAR. The acronym reads Radio Detection and Ranging systems. By means of a transmitter, the radio produces an electromagnetic signal that is then propagated into the space by means of antenna. When this signal strikes an object, it gets reflected back. The reflected signal is known to be the echo signal. The receiver then processes the echoed signal. For finding the range of the object, the system uses the time taken by the signal to get reflected. For the target location, an angle is calculated from the direction of the echo signal to the direction where the antenna is pointing. For moving objects, the Doppler Effect is used to calculate the speed and range of such object.