SYSTEM FOR CORRECTING GPS POSITION BY SYSTEM STATE ESTIMATION

摘要

A GPS(Global Positioning System) position compensating system using a system state estimation scheme is provided to calculate accurate GPS position data by removing a noise or a disturbance by updating an estimated system model. A GPS receiver(100) is attached to a structure and receives coordinate data from a GPS satellite. A GPS data processor(200) processes a data, such that the received coordinate data is recorded with time. An input 3-axis accelerometer(310) is mounted on the structure and measures an input acceleration of a vibration of the structure. An output 3-axis accelerometer(320) measures an output acceleration of the GPS receiver due to the vibration of the structure. A data processor(300) receives the input and output acceleration data. An estimator(330) compares the input acceleration data of the input 3-axis accelerometer with the output acceleration data of the output 3-axis accelerometer. A model update algorithm(340) models the input acceleration data, such that the input and output acceleration data are matched. A reference setting unit(350) sets a reference value for compensating for a GPS difference measured by the model update algorithm. A data analyzer(400) represents coordinate data in a frequency band and extracts a compensation frequency band due to the vibration and dynamic weight of the structure using the algorithm. A BPF(Band Pass Filter)(500) filters and compensates the coordinate data from the GPS data processor. A data postprocessor(600) performs a statistical manipulation on the compensated GPS data and determines accurate position coordinates.