System (GNSS) and Web-based online positioning services have become widespread. Owing to some advantages, such as work-duration and cost-effectiveness, many of users have implemented PPP method instead of the traditional relative positioning method for several applications. On GNSS applications the quality of satellite ephemerides products used for data evaluation is a significant factor that affects the results in post-processing solutions either applying relative or PPP methods on analyses. These products, classified as ultra-rapid, rapid and final orbits, are regularly provided by several national and international organizations to the users. In this paper, the accuracy of PPP method has been studied comparing the outcomes from various online Web services using different software and satellite ephemerides products. For this purpose, three test points were established on a place with completely free satellite visibility (AC01) and on the other two places with partially (YC01) and vastly (KC01) prevention of satellite signals near and within a forest area at Campus of Davutpaşa of the Yildiz Technical University of Istanbul. At these stations, static observations have been conducted with a time span of 6 hours on 4 th May 2015. The dataset collected using Topcon HiperPro receiver, a receiver for GPS and GLONASS data, was evaluated manually by means of the Bernese v5.2 (BSW) and GIPSY-OASIS v6.3 (Gipsy) scientific software. Moreover, the GNSS data were also proceeded using six different Web-based online services (AUSPOS, OPUS, CSRS-PPP, APPS, GAPS, Trimble-RTX) with ultra-rapid, rapid and final satellite ephemerides products. For the station with free satellite visibility (AC01), the analyses of outcomes indicate a coordinate accuracy of 1 cm for Web-based and manual data processing. That suggests relative good quality of orbit and clock corrections of satellites used by online data processing services for PPP. Furthermore, for station with partially (YC01) prevention of satellite signals, manual solutions have approximately 1 cm coordinate accuracies for n, e and u components. Moreover, when we compare the results among Web-based services, AUSPOS in relative solution and Trimble-RTX in PPP solution provides the best results. Here, one must emphasize that Trimble-RTX is a Web-based processing service for GNSS data (GPS, GLONASS, BeiDou, and QZSS) and operates an own global network of approximately 100 stations around the world for this purpose. For station with vastly (KC01) prevention of satellite signals, the best solutions were provided by APPS and CSRS-PPP using PPP approach among the Web-based services. Here, Trimble-RTX could not produce any solution. These results could demonstrate the benefit of multi constellation of GNSS in the areas with limited satellite visibility because of increasing of the number of measurements.En los años recientes, debido al incremento de operadores satelitales de corrección de órbita y tiempo para la evaluación de información en tiempo real y de postproceso, se ha generalizad...
Análise dos serviços online que empregam as técnicas dos posicionamentos GPSpor ponto preciso e relativo. TAYLAN OCALAN BAHATTIN ERDOGAN NURSU TUNALIOGLUYildiz Technical University Faculty of Civil Engineering Department of Geomatic Engineering Davutpasa Campus TR-34220 Esenler-İstanbul-Turkey tocalan@yildiz.edu.tr; berdogan@yildiz.edu.tr; nursutun@yahoo.com ABSTRACT Nowadays, Global Positioning System (GPS) has been used effectively in several engineering applications for the survey purposes by multiple disciplines. Web-based online services developed by several organizations; which are user friendly, unlimited and most of them are free; have become a significant alternative against the high-cost scientific and commercial software on achievement of post processing and analyzing the GPS data. When centimeter (cm) or decimeter (dm) level accuracies are desired, that can be obtained easily regarding different quality engineering applications through these services. In this paper, a test study was conducted at ISKI-CORS network; Istanbul-Turkey in order to figure out the accuracy analysis of the most used web based online services around the world (namely OPUS, AUSPOS, SCOUT, CSRS-PPP, GAPS, APPS, magicGNSS). These services use relative and precise point positioning (PPP) solution approaches. In this test study, the coordinates of eight stations were estimated by using of both online services and Bernese 5.0 scientific GPS processing software from 24-hour GPS data set and then the coordinate differences between the online services and Bernese processing software were computed. From the evaluations, it was seen that the results for each individual differences were less than 10 mm regarding relative online service, and less than 20 mm regarding precise point positioning service. The Analysis of WEB based online services for GPS relative and... Bol. Ciênc. Geod., sec. Artigos, Curitiba, v. 19, n o 2, p.191-207, abr-jun, 2013. 1 9 2 accuracy analysis was gathered from these coordinate differences and standard deviations of the obtained coordinates from different techniques and then online services were compared to each other. The results show that the position accuracies obtained by associated online services provide high accurate solutions that may be used in many engineering applications and geodetic analysis. Keywords: GPS; Precise Point Positioning (PPP); Post-Processing; Relative Positioning; Web-Based Online Services. RESUMO Hoje em dia o Sistema de Posicionamento Global (GPS) tem sido efetivamente utilizado em várias aplicações de engenharia para propósitos de levantamento em diversas áreas. Serviços online de posicionamento disponíveis por diversas organizações na WEB, tem se tornado uma alternativa importante ao invés do uso de softwares científicos e comerciais de alto custo no pós-processamento e análise de dados GPS. Com o uso desses serviços, é possível obter facilmente acurácia centimétrica (cm) ou decimétrica (dm). Neste artigo, um estudo foi conduzido na rede ISKI-CORS, Istambul -Turquia, com o obje...
Apsolutno određivanje položaja točke s GNSS/CORS (Globalni navigacijski satelitski sustav) u šumskim područjima predstavlja značajan izazov u smislu uštede vremena, kako bi se dobile što točnije koordinate točaka. Vrijeme za rješenje neodređenosti faze cijelih brojeva nosača obično traje jedan sat ili više za apsolutno određivanje točaka pod šumskim područjem s GNSS/CORS. U ovom istraživanju predložena je alternativna metoda za određivanje položaja točke, koja daje rezultate položaja s preciznošću na razini centimetra i potrebno je skoro 15 minuta kako bi se dala nova lokacija točke u šumskom području. Predložena metoda može također imati praktičnu primjenu za unutarnje prostore sa željenom preciznošću na razini cm, koja se postiže u kratkom vremenu promatranja. U ovom istraživanju, proveli smo terenski rad kako bi dobili koordinate točaka u šumskim područjima s GNSS/CORS sustavom i dodatnim mjerenjima, utvrđivanjem dviju kontrolnih točaka promatranih s GNSS/CORS lociranih na granici šumskog područja. Rezultati pokazuju da se zadovoljavajuće rješenje za šumsko područje postiže na razini cm (≈ ± 6 cm) u kratkom vremenu promatranja.
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