G-MoDe Detection of Small and Rapid Movements by a Single GPS Carrier Phase Receiver

Abstract

This paper presents a new method to detect small and rapid movements in real-time with a single L1-GPS receiver. The method is based on the prediction of single differences between satellites by appropriate Filter methods. The movements’ detection is based, on the one hand, on displacements computed with multiple prediction lengths, and on the other hand, on the time series of displacements computed with the previous epochs. The accuracy of this method is demonstrated by real 10-[Hz] observations with two L1-receivers. One antenna remained completely static, while characteristic movements were applied on the other. This allow us to compare on the one hand the displacements of the displaced antenna estimated by G-MoDe with standard differential kinematic processing and on the other hand the resolution and the noise behavior of G-MoDe applied on the data of the static antenna. The results indicate that, in good conditions, horizontal movements and of short duration and oscillatory movements above 5 mm amplitude are significantly detected (95%).