Although GPS is an efficient tool for deformation monitoring, it also is an expensive one for large projects. The authors developed a remote-controlled monitoring system using an electronic switching device for multiple antennas to monitor steep slopes at the Xiaowan hydropower station in China.
Add one more to the list of challenges faced by consumer GPS-enabled devices: the human hand that holds them. Body loading significantly degrades receiver sensitivity. A dielectrically loaded quadrifilar helix antenna can ameliorate this condition.
