A Concise Method for Calibrating the Offset of GPS Precise Satellite Orbit

Abstract

A set of Global Navigation Satellite Systems (GNSS) satellite orbit and clock offset are an essential prerequisite for precise application. However, abrupt changes in accuracy at the boundaries are prevalent in products provided by international GNSS services, resulting in decreased orbit interpolation precision near the daily boundary. In addition, the effect of this phenomenon is reflected in the deterioration of accuracy and the fluctuations in subsequent applications. In this study, time-weighted and equal-weighted calibrated methods were utilized for adjacent Global Positioning System (GPS) satellite orbits and the orbit variations were then corrected for the clock offset to ensure their consistency. The calibration method is evaluated based on the accuracy and smoothness of post-processing kinematic precise point positioning (PPP) and low earth orbit (LEO) precise orbit determination (POD) near the day boundary. In a variety of scientific applications, the results indicate that the proposed calibration method can effectively reduce the excessive differences near the day boundary between adjacent days. Near the boundary, maximum improvements for post-processing kinematic PPP, dynamic LEO precision orbit, kinematic LEO precision orbit are 41.5%, 9.4%, and 20.5%, respectively.

An effective method for improving GNSS precise point positioning performance at the day boundary

“…This results in incomplete compensation with satellite clock errors. In Yang et al [30], the satellite orbit was calibrated first and then the satellite clock error was corrected according to the difference between the modified orbit and the original orbit. In this research, assuming that IGS satellite clock and orbit products are fixed, we estimate the uncompensated biases at the day boundary and correct them to the original IGS satellite clock products.…”

“…To mitigate effect of the day-boundary discontinuities in the satellite clock product on time transfer solutions, various studies have been conducted [17,19,[26][27][28][29][30][31]. Overlapping arcs are commonly employed to reduce the impact of the dayboundary discontinuities [27][28][29].…”

“…Three day long-arc orbit solutions were done by Center for Orbit Determination in Europe (CODE) in final products to provide overlapping arcs [29]. In addition to utilizing overlapping arcs, improving satellite orbit interpolation algorithms is another common approach to mitigate discontinuities in satellite orbit and clock products [17,30]. In Song et al [17], an effective interpolation method was proposed to address the dayboundary discontinuities in GNSS satellite orbit products, and an analysis of the residuals in corresponding static PPP is conducted.…”

“…In Song et al [17], an effective interpolation method was proposed to address the dayboundary discontinuities in GNSS satellite orbit products, and an analysis of the residuals in corresponding static PPP is conducted. Yang et al [30] used time-weighted and equal-weighted calibration methods to ensure consistency between satellite orbit and clock offset at the boundaries and a maximum improvement of 41.5% was achieved for postprocessing kinematic PPP. Furthermore, by decreasing the interval of IGS clock products from 5 min to 30 s, the discontinuities of PPP were reduced by 10%-30% [31].…”

Study on the Source of Debris Flow in the Northern Scenic Spot of Changbai Mountain Based on Multi-Source Data

“…Previous studies have mostly applied offset-tracking technology to the fields of earthquakes, glaciers and landslides, but few people have applied this technology to the surface deformation monitoring of debris flows [32][33][34][35][36]. Chen used SBAS-InSAR technology to monitor the deformation of the debris flow source area of Xulong Ditch and obtain the annual deformation of the area [20].…”