GPS DATA STACKING FOR SMALL SCALE GPS DEFORMATION MONITORING APPLICATIONS

GPS data stacking techniques have been evaluated for deformation monitoring of an open pit high wall in central Western Australia. GPS stacking techniques proposed in the literature using both observable and coordinate stacking methodologies are based on the assumption that GPS data observed at the same point are well correlated from day to day. Data presented in this paper challenges this assumption by illustrating that GPS data may not be well correlated under conditions where high levels unmodelled systematic error are present due to complex multipath reflectors such as natural and man-made rock structures. 1