การทดสอบความสามารถของวิธีรังวัดด้วยดาวเทียมจีพีเอสโดยวิธีแบบจลน์ในทันที และวิธีย้อนกลับแบบจลน์ในทันที

Abstract

Real-time reliable monitoring of the dynamic and deflection behavior of flexible structures such as long span bridges is of great interest for civil engineer. For many years, monitoring the dynamic behavior of engineering structures has relied on measurements made by accelerometer and anemometer. However, the response data provided by these instruments require an integration process to arrive at the displacements of structures. On the other hand, the Real-Time Kinematic (RTK) GPS technique can directly measure the 3-d coordinates. GPS receivers with a capability of resolving motion at the centimeter level with sampling rates of 10 Hz and higher are now available. Previous studies demonstrated the feasibility of deploying GPS receivers for the dynamic monitoring of structures. In order to monitor the dynamic of structures in an instantaneous mode, it is necessary to use a Real-Time Kinematic GPS technique in inversed mode – with mobile ‘base staion’ and fixed ‘rover’. Thus, this paper aims to assess the performance of Real-Time Kinematic and Inversed Real-Time Kinematic GPS techniques for detecting vertical movements of the Bridge Model.