{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T09:08:48Z","timestamp":1773133728987,"version":"3.50.1"},"reference-count":56,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T00:00:00Z","timestamp":1681257600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>It has been proven that precise point positioning (PPP) is a well-established technique to obtain high-precision positioning in the order between centimeters and millimeters. In this context, different studies have been carried out to evaluate the performance of PPP in static mode as a possible alternative to the relative method. However, only a few studies have evaluated the performance of a large number of different open-source software programs and have focused extensively on online free PPP services. Therefore, in this paper, a comprehensive comparison of processing in static mode between different open-source software and the online free PPP services is developed. For the evaluation, different GNSS observation files collected at 45 International GNSS Service (IGS) stations distributed worldwide were processed in static PPP mode. Within this frame of reference, ten open-source PPP software and five online free PPP services were studied. The results from the processing strategy demonstrate that it is possible to obtain precision in the order of millimeters with both open-source software and online PPP services. In addition, online PPP services experienced better performance than some other specialized PPP software. In summary, the results show that the daily solutions for the E (East), N (North), and U (Up) components estimated by the ten open-source software and by the five online free PPP services can reach millimeter precision for some stations. Among the open-source software, the PRIDE-PPPAR presented the best performance with a Root Mean Square Error (RMSE) of 5.52, 5.40, and 6.79 mm in the E, N, and U components, respectively. Alternatively, in the case of the online free PPP services, the APPS and CSRS-PPP produced the most accurate results, with RMSE values less than 12 mm for the three components. Finally, the open-source software and online free PPP services experienced similar positioning performance in the horizontal and vertical components, demonstrating that both can be implemented in static mode without compromising the accuracy of the measurement.<\/jats:p>","DOI":"10.3390\/rs15082034","type":"journal-article","created":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T04:51:01Z","timestamp":1681275061000},"page":"2034","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Evaluation and Analysis of the Accuracy of Open-Source Software and Online Services for PPP Processing in Static Mode"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5487-3371","authenticated-orcid":false,"given":"Jesus Ren\u00e9","family":"V\u00e1zquez-Ontiveros","sequence":"first","affiliation":[{"name":"Department of Earth and Space Sciences, Autonomous University of Sinaloa, Culiacan 80040, Mexico"}]},{"given":"Jorge","family":"Padilla-Velazco","sequence":"additional","affiliation":[{"name":"Department of Earth and Space Sciences, Autonomous University of Sinaloa, Culiacan 80040, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9230-8111","authenticated-orcid":false,"given":"J. Ramon","family":"Gaxiola-Camacho","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Autonomous University of Sinaloa, Culiacan 80040, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8456-537X","authenticated-orcid":false,"given":"Guadalupe Esteban","family":"V\u00e1zquez-Becerra","sequence":"additional","affiliation":[{"name":"Department of Earth and Space Sciences, Autonomous University of Sinaloa, Culiacan 80040, Mexico"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,12]]},"reference":[{"key":"ref_1","first-page":"47","article-title":"Point positioning concept using precise ephemeris","volume":"1","author":"Anderle","year":"1976","journal-title":"Satell. Doppler Position."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"5005","DOI":"10.1029\/96JB03860","article-title":"Precise Point Positioning for the efficient and robust analysis of GPS data from large networks","volume":"102","author":"Zumbergue","year":"1997","journal-title":"J. Geophys. Res. Solid Earth"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"12","DOI":"10.1007\/PL00012883","article-title":"Precise point positioning using IGS orbit and clock products","volume":"5","author":"Kouba","year":"2001","journal-title":"GPS Solut."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Xi, R., Chen, Q., Meng, X., Psimoulis, P., Jiang, W., and Xu, C. (2021). Pass-by-Pass Ambiguity Resolution in Single GPS Receiver PPP Using Observations for Two Sequential Days: An Exploratory Study. Remote Sens., 13.","DOI":"10.3390\/rs13183728"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Liu, T., Wang, J., Yu, H., Cao, X., and Ge, Y. (2018). A new weighting approach with application to ionospheric delay constraint for GPS\/GALILEO real-time precise point positioning. Appl. Sci., 8.","DOI":"10.3390\/app8122537"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"978","DOI":"10.1016\/j.asr.2019.10.017","article-title":"Analysis of GNSS clock prediction performance with different interrupt intervals and application to real-time kinematic precise point positioning","volume":"65","author":"Yan","year":"2020","journal-title":"Adv. Space Res."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"893","DOI":"10.1080\/19475705.2017.1284160","article-title":"Experimental testing of high-rate GNSS precise point positioning (PPP) method for detecting dynamic vertical displacement response of engineering structures","volume":"8","author":"Yigit","year":"2017","journal-title":"Geomat. Nat. Hazards Risk"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Romero-Andrade, R., Trejo-Soto, M.E., V\u00e1zquez-Ontiveros, J.R., Hern\u00e1ndez-Andrade, D., and Cabanillas-Zavala, J.L. (2021). Sampling rate impact on Precise Point Positioning with a Low-Cost GNSS receiver. Appl. Sci., 11.","DOI":"10.3390\/app11167669"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Du, S., Shu, B., Xie, W., Huang, G., Ge, Y., and Li, P. (2022). Evaluation of Real-time Precise Point Positioning with Ambiguity Resolution Based on Multi-GNSS OSB Products from CNES. Remote Sens., 14.","DOI":"10.3390\/rs14194970"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1007\/s00190-007-0187-4","article-title":"Resolution of GPS carrier-phase ambiguities in precise point positioning (PPP) with daily observations","volume":"82","author":"Ge","year":"2008","journal-title":"J. Geod."},{"key":"ref_11","unstructured":"Collins, P., Lahaye, F., Heroux, P., and Bisnath, S. (2008, January 16\u201319). Precise point positioning with ambiguity resolution using the decoupled clock model. Proceedings of the 21st International Technical Meeting of the Satellite Division of the Institute of Navigation, Savannah, GA, USA."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1002\/j.2161-4296.2009.tb01750.x","article-title":"Integer ambiguity resolution on undifferenced GPS phase measurements and its application to PPP and satellite precise orbit determination","volume":"56","author":"Laurichesse","year":"2009","journal-title":"Navigation"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Chen, C., Xiao, G., Chang, G., Xu, T., and Yang, L. (2021). Assessment of GPS\/Galileo\/BDS Precise Point Positioning with Ambiguity Resolution Using Products from Different Analysis Centers. Remote Sens., 13.","DOI":"10.3390\/rs13163266"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1267","DOI":"10.1007\/s12145-022-00814-7","article-title":"An improved weighting strategy for tropospheric delay estimation with real-time single-frequency precise positioning","volume":"15","author":"Bahadur","year":"2022","journal-title":"Earth Sci. Inform."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"108677","DOI":"10.1016\/j.measurement.2020.108677","article-title":"Implementation of PPP-GNSS measurement technology in the probabilistic SHM of bridge structures","volume":"173","author":"Quintana","year":"2021","journal-title":"Measurement"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4743","DOI":"10.1109\/TGRS.2020.2966774","article-title":"Real-time retrieval of precipitable water vapor from Galileo observations by using the MGEX network","volume":"58","author":"Lu","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2231","DOI":"10.1007\/s12145-022-00868-7","article-title":"Investigation of accuracy of PPP and PPP-AR methods for direct georeferencing in UAV photogrammetry","volume":"15","author":"Ocalan","year":"2020","journal-title":"Earth Sci. Inform."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"12","DOI":"10.1007\/s10291-005-0147-5","article-title":"Online GPS processing services: An initial study","volume":"10","author":"Dare","year":"2006","journal-title":"GPS Solut."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"537","DOI":"10.1007\/s10291-014-0413-5","article-title":"Precision comparison and analysis of four online free PPP services in static positioning and tropospheric delay estimation","volume":"19","author":"Guo","year":"2015","journal-title":"GPS Solut."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1515\/jag-2018-0046","article-title":"Accuracy assessment of relative and precise point positioning online GPS processing services","volume":"13","author":"Miky","year":"2019","journal-title":"J. Appl. Geod."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-010-0173-9","article-title":"Analyzing GNSS data in precise point positioning software","volume":"15","author":"Leandro","year":"2010","journal-title":"GPS Solut."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"108","DOI":"10.31026\/j.eng.2019.10.08","article-title":"Evaluation of the Performance of Online GPS\/GNSS Data Processing Services for Monitoring the Land Deformations and Movements","volume":"25","author":"Wanas","year":"2019","journal-title":"J. Eng."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"535","DOI":"10.1179\/003962611X13117748892074","article-title":"Analysis of web-based GNSS post-processing services for static and kinematic positioning using short data spans","volume":"43","year":"2011","journal-title":"Surv. Rev."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1080\/19475705.2020.1714752","article-title":"Accuracy comparison of post-processed PPP and real-time absolute positioning techniques","volume":"11","author":"Alkan","year":"2020","journal-title":"Geomat. Nat. Hazards Risk"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"361","DOI":"10.1016\/j.measurement.2019.05.094","article-title":"Comparative analysis of MGEX products for post-processing multi-GNSS PPP","volume":"145","author":"Bahadur","year":"2019","journal-title":"Measurement"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"04020007","DOI":"10.1061\/(ASCE)SU.1943-5428.0000314","article-title":"Ambiguity-resolved real-time precise point positioning as a potential fill-in service for sparse CORS networks","volume":"146","author":"Grinter","year":"2020","journal-title":"J. Surv. Eng."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"5","DOI":"10.2478\/arsa-2020-0004","article-title":"Performance analysis of static precise point positioning using open-source GAMP","volume":"55","author":"Malik","year":"2020","journal-title":"Artif. Satell."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1179\/1752270613Y.0000000068","article-title":"Performance evaluation of short to long term GPS, GLONASS and GPS\/GLONASS post-processed PPP","volume":"46","author":"Yigit","year":"2014","journal-title":"Surv. Rev."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.measurement.2015.03.012","article-title":"A comparative study for accuracy assessment of PPP technique using GPS and GLONASS in urban areas","volume":"69","author":"Alkan","year":"2015","journal-title":"Measurement"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"5","DOI":"10.7494\/geom.2021.15.4.5","article-title":"Accuracy Assessment of a Variety of GPS Data Processing, Online Services and Software","volume":"15","author":"Mohammed","year":"2021","journal-title":"Geomat. Environ. Eng."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Dawidowicz, K., and Bakula, M. (2023). Impact of BeiDou Observations on the Accuracy of Multi-GNSS PPP in a Function of Observing Session Duration within Europe-Analysis Based on Open-Source Software GAMP. Remote Sens., 15.","DOI":"10.3390\/rs15010158"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-018-0777-z","article-title":"PPPH: A MATLAB-based software for multi-GNSS precise point positioning analysis","volume":"22","author":"Bahadur","year":"2018","journal-title":"GPS Solut."},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Ib\u00e1\u00f1ez, D., Rovira-Garcia, A., Sanz, J., Juan, J.M., Gonz\u00e1lez-Casado, G., Jimenez-Ba\u00f1os, D., and Lapin, I. (2018, January 5\u20137). The GNSS laboratory tool suite (gLAB) updates: SBAS, DGNSS and global monitoring system. Proceedings of the 2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing, Noordwijk, The Netherlands.","DOI":"10.1109\/NAVITEC.2018.8642707"},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Hernandez-Pajares, M., Juan, J.M., Sanz, J., Ramos-Bosch, P., Rovira-Garcia, A., Salazar, D., and Hein, G. (2018, January 8\u201310). The ESA\/UPC GNSS-Lab tool (gLAB): An advanced multipurpose package for GNSS data processing. Proceedings of the 2010 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), Noordwijk, The Netherlands.","DOI":"10.1109\/NAVITEC.2010.5708032"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Zhang, Y., Kubo, N., Chen, J., Wang, J., and Wang, H. (2019). Initial positioning assessment of BDS new satellites and new signals. Remote Sens., 11.","DOI":"10.3390\/rs11111320"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2645","DOI":"10.1016\/j.asr.2020.03.011","article-title":"The update of BDS-2 TGD and its impact on positioning","volume":"65","author":"Zhang","year":"2020","journal-title":"Adv. Space Res."},{"key":"ref_37","unstructured":"Takasu, T., and Yasuda, A. (2009, January 4\u20136). Development of the low-cost RTK-GPS receiver with an open-source program package RTKLIB. Proceedings of the International Symposium on GPS\/GNSS, Jeju, Republic of Korea."},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Angrisano, A., Dardanelli, G., Innac, A., Pisciotta, A., Pipitone, C., and Gaglione, S. (2020). Performance Assessment of PPP Surveys with Open-Source Software Using the GNSS GPS\u2013GLONASS\u2013Galileo Constellations. Appl. Sci., 10.","DOI":"10.3390\/app10165420"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-019-0888-1","article-title":"PRIDE PPP-AR: An open-source software for GPS PPP ambiguity resolution","volume":"23","author":"Geng","year":"2019","journal-title":"GPS Solut."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-020-00976-1","article-title":"MG-APP: An open-source software for multi-GNSS precise point positioning and application analysis","volume":"24","author":"Xiao","year":"2020","journal-title":"GPS Solut."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1007\/s10291-015-0469-x","article-title":"goGPS: Open-source MATLAB software","volume":"20","author":"Herrera","year":"2016","journal-title":"GPS Solut."},{"key":"ref_42","first-page":"1","article-title":"GAMP: An open-source software of multi-GNSS precise point positioning using undifferenced and uncombined observations","volume":"22","author":"Zhou","year":"2018","journal-title":"GPS Solut."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-020-01052-4","article-title":"PPPLib: An open-source software for precise point positioning using GPS, BeiDou, Galileo, GLONASS, and QZSS with multi-frequency observations","volume":"25","author":"Chen","year":"2021","journal-title":"GPS Solut."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1016\/j.asr.2020.04.015","article-title":"GipsyX\/RTGx, a new tool set for space geodetic operations and research","volume":"66","author":"Bertiger","year":"2020","journal-title":"Adv. Space Res."},{"key":"ref_45","first-page":"137","article-title":"Space geodetic techniques and the Canadian spatial reference system evolution, status and possibilities","volume":"60","author":"Kouba","year":"2006","journal-title":"Geomatica"},{"key":"ref_46","first-page":"17","article-title":"CSRS-PPP: An internet service for GPS user access to the Canadian Spatial Reference Frame","volume":"59","author":"Kouba","year":"2005","journal-title":"Geomatica"},{"key":"ref_47","unstructured":"Leandro, R.F. (2009). Precise Point Positioning with GPS: A New Approach for Positioning, Atmospheric Studies, and Signal Analysis. [Ph.D. Dissertation, University of New Brunswick]."},{"key":"ref_48","unstructured":"Doucet, K., Herwing, M., Kipka, A., Kreikenbohm, P., Landau, H., Leandro, R., and Pagels, C. (2012, January 17\u201321). Introducing ambiguity resolution in web-hosted global multi-GNSS Precise Point Positioning with trimble RTK-PP. Proceedings of the 25th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2012), Nashville, TN, USA."},{"key":"ref_49","unstructured":"Nardo, A., Drescher, R., Brandl, M., Chen, X., Landau, H., Rodriguez-Solano, C., and Weinbach, U. (2015, January 7\u201310). Experiences with trimble center point RTX with fast convergence. Proceedings of the ESA European Navigation Conference (ENC2015), Bordeaux, France."},{"key":"ref_50","unstructured":"Garc\u00eda, A.M., P\u00edriz, R., Samper, M.D.L., and Merino, M.M.R. (2010, January 26\u201328). Multisystem Real Time Precise-Point-Positioning, today with GPS+ GLONASS in the near future also with QZSS, Galileo, Compass, IRNSS. Proceedings of the International Symposium on GPS\/GNSS, Taipei, Taiwan."},{"key":"ref_51","unstructured":"CSRS-PPP (2022, November 20). Canadian Spatial Reference System Precise Point Positioning, Natural Resources Canada. Available online: https:\/\/webapp.csrs-scrs.nrcan-rncan.gc.ca\/geod\/tools-outils\/ppp-info.php?locale=en."},{"key":"ref_52","unstructured":"Nischan, T. (2016). GFZRNX-RINEX GNSS Data Conversion and Manipulation Toolbox, GFZ Data Services. version 1.05."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Dadras Eslamlou, A., and Huang, S. (2022). Artificial-Neural-Network-Based Surrogate Models for Structural Health Monitoring of Civil Structures: A Literature Review. Buildings, 12.","DOI":"10.3390\/buildings12122067"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1007\/s11430-011-4308-9","article-title":"Simulation research on a minimum root-mean-square error rotation-fitting algorithm for gravity matching navigation","volume":"55","author":"Wang","year":"2012","journal-title":"Sci. China Earth Sci."},{"key":"ref_55","unstructured":"Rizos, C. (1997). Principles and Practice of GPS Surveying, School of Geomatic Engineering, University of New South Wales. [1st ed.]."},{"key":"ref_56","doi-asserted-by":"crossref","unstructured":"Ghilani, C.D. (2017). Adjustment Computations: Spatial Data Analysis, John Wiley & Sons. [6th ed.].","DOI":"10.1002\/9781119390664"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/8\/2034\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:14:32Z","timestamp":1760123672000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/8\/2034"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,4,12]]},"references-count":56,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2023,4]]}},"alternative-id":["rs15082034"],"URL":"https:\/\/doi.org\/10.3390\/rs15082034","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,4,12]]}}}