Given an object, its positioning in the space is a main concern in structural monitoring and a required feedback in structural health monitoring, structural control and robotics. In addition, to make the sensor unit wireless is a crucial issue for advanced applications. This paper deals with the exploitation of wireless transmission technology to long-term monitoring GPS (Global Positioning System) receivers - like the Leica GMX 902 and the Leica GRX 1200-pro. These GPS receivers consist of five parts: antenna, receiver, user client computer, interface and power supply. The antenna is mounted on the object to be monitored and is
connected with the receiver by a coaxial-cable through which the radio frequency signals are transmitted. The
receiver unit acquires, tracks and demodulates the satellite signals and provides, through an interface which in this paper is made wireless, the resulting GPS raw data to the user client computer for being further processed
by a suitable positioning algorithm. The power supply reaches the computer by a wired link, while the other
modules rely on batteries re-charged by power harvesting devices. Two wireless transmission systems, the
24XStream and the CC1110, are applied to replace the cable transmission between the receiver and the user
client computer which up to now was the only market offer. To verify the performance and the reliability of this wireless transmission system, some experiments are conducted. The results show a successful cable replacement.
[1]
C. Fuggini,et al.
Monitoring a steel building using GPS sensors
,
2011
.
[2]
Jerome P. Lynch,et al.
A summary review of wireless sensors and sensor networks for structural health monitoring
,
2006
.
[3]
Fabio Casciati,et al.
A power harvester for wireless sensing applications
,
2007
.
[4]
Ivan Bartoli,et al.
Laser-Air-Coupled Hybrid Noncontact System for Defect Detection in Rail Tracks Status of FRA Prototype Development at University of California-San Diego
,
2006
.
[5]
Ahsan Kareem,et al.
Experimental Verification and Full-Scale Deployment of Global Positioning Systems to Monitor the Dynamic Response of Tall Buildings
,
2006
.
[6]
C. Fuggini,et al.
Engineering vibration monitoring by GPS: long duration records
,
2009
.