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Wireless Sensor Networks (WSNs) which utilise IEEE 802.15.4 technology offer the potential for low cost deployment and maintenance compared with conventional wired sensor networks, enabling effective and efficient condition monitoring of aged civil engineering infrastructure. We will address wireless propagation for a below to above ground scenario where one of the wireless nodes is located in a below...
In comparison with a wired sensor network, a Wireless Sensor Network (WSN) has the potential for easy deployment and increased flexibility and so enabling efficient and low cost condition monitoring of aged civil engineering infrastructure. We will address two wireless communication scenarios, firstly between wireless nodes within a tunnel and secondly for a below to above ground situation where one...
A TEM horn antenna is usually applied to the air-launching GPR system. Traditionally, the variation of characteristic impedance of a TEM horn antenna is usually set to range from 50 Omega (characteristic impedance of a coaxial cable) to 376.7 Omega (free space wave impedance). However, a difference regularly exists between transmission-line wave characteristic impedance and free space wave impedance...
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