A Comparative Analysis of GNSS Processing Services for Static Measurements: Evaluating Accuracy and Stability at Different Observation Periods

Abstract

This study examines the accuracy and stability of three prominent Precise Point Positioning (PPP) services: AUSPOS, Trimble RTX, and OPUS, across varying observation periods from 30 to 180 minutes. Static GNSS data was collected at eight different locations over a three-hour timeframe. The analysis focused on comparing the geocentric coordinates (X, Y, Z) obtained from each service, utilizing metrics such as Root Mean Square Error (RMSE) and standard deviations to assess performance. The results revealed that processing time significantly influences accuracy, with Trimble RTX demonstrating the highest precision across all intervals. AUSPOS displayed considerable variations at shorter observation periods, while OPUS exhibited larger discrepancies, indicating potential challenges in stability. These findings underscore the strengths and weaknesses of each service, offering critical insights for selecting the most appropriate GNSS processing option tailored to specific geodetic applications. By highlighting the relationship between observation duration and positioning accuracy, this study contributes valuable knowledge to the field of geodesy and PPP service utilization.