Displacement change perception of foundation pit support based on high-precision pseudolite positioning
In order to improve the accuracy and automation of the monitoring results under complex construction environment,the pseudolite independent networking technology was used to monitor the varieties in the horizontal position of foundation pit for a long time.Firstly,relative positioning observation equation is established and the ambiguity parameters is fixed based on the known point initial-ization method.Secondly,carrier double-difference multipath errors from relative positioning is modeled and corrected.Finally,the linearization error of the observation model is eliminated by using UKF to obtain the final positioning result,and this result is compared with the real displacement.The results show that the high-precision pseudolite positioning system can be used to effectively perceive the small displacement of foundation pit support,and its absolute error is basically within 0.1 mm,and the average relative error is about 10％.
foundation pit supportpseudoliteperception of displacement changesmultipath error
NETL
NSTL
万方数据
维普
