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The principles and characteristics of matching various PPP-B2b corrections are introduced and analyzed. The performance and accuracy of broadcast ephemeris and PPP-B2b signals are compared and evaluated by referring to the precise ephemeris. The root mean square (RMS) errors in the Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS)-3 broadcast ephemeris orbits in the along direction are larger than those in the other two (radial and cross) directions, and correspondingly, the along component PPP-B2b corrections are greatest. The continuity and smoothness of the GPS and BDS-3 broadcast ephemeris orbits and clock offsets are improved with the PPP-B2b corrections. The availability of PPP-B2b corrections is comprehensively analyzed for the TJU-01 satellite. Several comparative schemes are adopted for the RT POD of the TJU-01 satellite using the broadcast ephemeris and PPP-B2b corrections. The RT POD performance is improved considerably with the broadcast ephemeris corrected by the PPP-B2b signals. The RMS of the RT orbital errors in the radial, along, and cross directions is 0.10, 0.13, and 0.09 m, respectively, using BDS-3 and GPS PPP-B2b corrections, with reference to the solutions calculated with the precise ephemeris. The accuracy is improved by 5.1%, 43.9%, and 28.7% in the three directions, respectively, relative to that achieved with the broadcast ephemeris. It is concluded that a greater proportion of received PPP-B2b satellite signals corresponds to a greater improvement in the accuracy of the RT POD of the LEO satellite.<\/jats:p>","DOI":"10.3390\/rs16050833","type":"journal-article","created":{"date-parts":[[2024,2,28]],"date-time":"2024-02-28T07:56:02Z","timestamp":1709106962000},"page":"833","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Real-Time Precise Orbit Determination of Low Earth Orbit Satellites Based on GPS and BDS-3 PPP B2b Service"],"prefix":"10.3390","volume":"16","author":[{"given":"Yali","family":"Shi","sequence":"first","affiliation":[{"name":"Institute of Space Sciences, Shandong University, Weihai 264209, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5818-6264","authenticated-orcid":false,"given":"Tianhe","family":"Xu","sequence":"additional","affiliation":[{"name":"Institute of Space Sciences, Shandong University, Weihai 264209, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3053-6669","authenticated-orcid":false,"given":"Min","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Space Sciences, Shandong University, Weihai 264209, China"}]},{"given":"Kai","family":"Wei","sequence":"additional","affiliation":[{"name":"Qilu Aerospace Information Research Institute, Chinese Academy of Sciences, Jinan 250100, China"}]},{"given":"Shuai","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Systems Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China"}]},{"given":"Dixing","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Space Sciences, Shandong University, Weihai 264209, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"747","DOI":"10.1016\/j.actaastro.2005.03.066","article-title":"Orbit determination system for the kompsat-2 using gps measurement data","volume":"57","author":"Lee","year":"2005","journal-title":"Acta Astronaut."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1007\/s10291-007-0080-x","article-title":"Precision real-time navigation of leo satellites using global positioning system measurements","volume":"12","author":"Montenbruck","year":"2007","journal-title":"GPS Solut."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1109\/TAES.2015.140758","article-title":"Gps-based onboard real-time orbit determination for leo satellites using consider kalman filter","volume":"52","author":"Yang","year":"2016","journal-title":"IEEE Trans. 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