The Analysis of Scientific and Commercial Softwares Accuracy in GPS Observation Processing

Abstract

The engineers use various softwares for observation processing and GPS networks, generally everyone who uses a device, he uses softwares with the same brand for the processing of it GPS processing networks by defined default parameters and models. The most outstanding issue is that, it should be understood, the application of which kinds of softwares will help us to gain the desirable accuracy and whether the accuracy of coordinate estimation is acceptable in all commercial softwares or not. In this article, we compared a series of softwares which engineers use for their data processing with powerful scientific software that meanwhile it is too hard and time consuming to learn it. We have considered accuracy and validity of scientific software, which gives acceptable results, as a baseline to see how much errors and difference is between this software and the commercial softwares, so we selected Bernese as a scientific software and LGO, Ashtech Solutions, CGO softwares as commercial softwares and we analyzed them and compared the applied models of the softwares with each other. To do so, we choose a GPS network from Tehran city and discussed it, in order to evaluate the measured accuracy for baselines and also coordinate system that after data processing, it was understood that if the polygon of a network is small, commercial softwares can be utilized with very high acceptable accuracies and even by Ephemerides Precise data, their accuracy will increase more, but if our network is more extended and bigger, there is no other choice except using scientific softwares to calculate coordinate that performs a processing by many parameters.

Homogenizing coordinates through the use of the active CORS in Ghana

“…According to Mageed (2015), commercial software, such as Topcon tools, outperforms scientific software when baselines of less than 30km are processed. Similar studies which supported this assertion can be found in Hamidi and Javadi (2017); and Andritsanos et al (2016). Since Topcon Tools uses the Modified Hopfield Model for tropospheric corrections (Innac et al, 2020), all post processing tasks in this study were carried out by Topcon Tools software version 8.2.3 in differential mode (Zinoviev, 2005;Azhari, 2015 andTopcon, 2017).…”

Perbandingan Ketelitian GNSS dengan Metode NRTK, Real-Time PPP dan Post-Processed PPP

“…Sebagai solusi untuk kebutuhan data secara real time, maka pada pertengahan tahun 1990 dikenalkan metode Real-Time Kinematik (Hamidi & Javadi, 2017). Pada metode ini, receiver GNSS ditempatkan di base untuk kemudian mengirimkan koreksi kepada receiver GNSS di rover dengan menggunakan radio-link, dimana pengolahan data dilakukan secara langsung pada receiver di rover sehingga memberikan ketelitian posisi dalam rentang centimeter hingga desimeter secara real time (Alkan, Erol, İlçi, dkk., 2020).…”

Perbandingan Posisi Tiga Dimensi Pengukuran GNSS Menggunakan Metode Diferensial Statik dengan Berbagai Variasi Epoch Rate

“…Adapun tingkat ketelitian posisi yang dihasilkan berdasarkan Ramadhon (2015) yang melakukan penelitian dengan membandingkan kedua moda tersebut dengan panjang baseline < 200 m dan lama pengukuran yang sama, memberikan perbedaan rata-rata sebesar 9,1 mm di sumbu easting, 2,7 mm di sumbu northing, dan 2,3 cm pada data tinggi. Secara umum, ketelitian posisi tiga dimensi yang dihasilkan oleh pengukuran GNSS dengan metode diferensial statik dipengaruhi oleh beberapa faktor, yaitu: jenis receiver GNSS (Weaver dkk., 2015;Correa-Muños & Cerón-Calderón, 2018), panjang baseline antara base dan rover (Han dkk., 2012;Hafiz dkk., 2014), lama pengamatan dan geometri satelit (Ocalan dkk., 2016), jenis perangkat lunak pengolahan data GNSS yang digunakan (Hamidi & Javadi, 2017), lingkungan pengamatan (Han dkk., 2012;Khomsin dkk., 2019), dan interval pengamatan atau epoch rate (Yuwono & Apsandi, 2018;Erol dkk., 2020). Salah satu faktor yang mempengaruhi ketelitian koordinat tiga dimensi pada metode diferensial statik yaitu epoch rate.…”