Assessment of Single and Precise Point Positioning Over Long Observational Periods

Abstract

In this work, the accuracy of using Single Point Positioning (SPP) and Precise Point Positioning (PPP) techniques is assessed in case of using long observational periods. Positioning using Differential Global Navigation Satellite System (DGNSS) technique is adopted to achieve reliable accurate results to be used as a reference in the evaluation process for both SPP and PPP positioning techniques. A number of neighboring International GNSS Service (IGS) stations were participated in this study for the differential positioning. GNSS data over one month for a continuous operating station at Faculty of Engineering, Ain Shams University were collected and processed on a daily basis in the SPP and PPP processing modes. In addition, DGNSS processing sessions using the IGS stations were carried out for each day of the month. The positional differences for both SPP and PPP solutions with respect to the DGNSS solutions were computed. The results showed that the SPP solutions had positional differences with mean value 23.4cm, while the PPP solutions had positional differences with mean value 12.7cm. In addition, by considering a unique monthly solution for each technique, the positional difference reaches to 15 cm in case of the SPP solution and 12.5 cm in case of the PPP solution. Thus, applications that do not require immediate positioning, such as wildlife management and insect infestation, can benefit from these results with low-cost hardware components. In addition, monitoring significant tectonic motions caused by earthquakes is another application in this context.

Effect of Igs Baseline Length on GNSS Positioning Accuracy

“…In recent years, there has been a steady increase of interest in achieving high positional accuracy with a PPP. The need to reduce the cost of differential positioning using multiple receivers and save time and effort while occupying multiple stations has always pushed for faster steps to achieve higher positional accuracy using a single receiver (El-Tokhey et al, 2019). Standard Point Positioning (SPP) and PPP, which are two degrees of the Absolute Point Positioning (APP) service (based on precision), are available (Acheampong, 2008; Sunehra, 2013).…”