Online school frequency and time service of high precision clock based on the generalized regression model of GPS

Jiazhu Zheng, Yehemin Gao

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12C) 710-714

Nanjing Forestry University, Nanjing, 210037, China

In order to improve accuracy and stability of GPS wide area time service, this paper established generalized regression model of clock based on the different characteristics of GPS clock and crystal clock, and estimated crystal frequency by generalized least squares (GLS) method. Algorithm corrected the error caused by measurement value frequency drifting in the existing regression model, thereby realizing accurate estimation when crystal frequency drifting is large or interval of measurement value is long. Based on that, time service of pulse per second that is synchronous with coordinated universal time (UTC) was generated. Through phrase compensation algorithm, the phrase difference between the generated pulse per second and pulse per second GPS was corrected to realize accurate time service, thereby providing accurate time scale for wide area measurement and fault location and meeting the online wide area time service requirements of power system monitoring system.