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This study utilizes data from MGEX, iGMAS, and CORS stations to estimate and analyze long time series of BDS\/GNSS DCBs, focusing on stability and influencing factors. Results indicate that DCBs for the same signal, but different channels exhibit similar ranges and trends. Among BDS DCBs, those from satellites with rubidium atomic clocks are more stable than those with hydrogen atomic clocks. An upgrade and maintenance of BDS in late 2022, reported by NABU, likely contributed to DCB jumps. BDS-compatible signal DCBs show weaker stability compared to GPS and Galileo. Variations in GNSS signal processing and receiver algorithms also impact DCB stability. Converting DCBs to OSBs and performing RMS statistics revealed that smaller differences between signals increase the susceptibility of observation equations to observation quality.<\/jats:p>","DOI":"10.3390\/rs16224217","type":"journal-article","created":{"date-parts":[[2024,11,12]],"date-time":"2024-11-12T09:36:51Z","timestamp":1731404211000},"page":"4217","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Comprehensive Analysis of BDS\/GNSS Differential Code Bias and Compatibility Performance"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-2306-8126","authenticated-orcid":false,"given":"Yafeng","family":"Wang","sequence":"first","affiliation":[{"name":"School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China"},{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"},{"name":"Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, CASM, Beijing 100036, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongjie","family":"Yue","sequence":"additional","affiliation":[{"name":"School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hu","family":"Wang","sequence":"additional","affiliation":[{"name":"Chinese Academy of Surveying and Mapping, Beijing 100036, China"},{"name":"Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of MNR, CASM, Beijing 100036, China"},{"name":"Beijing Fangshan Human Satellite Laser National Field Scientific Observation and Research Station, Beijing 100036, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3772-1966","authenticated-orcid":false,"given":"Hongyang","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Geomatics Science and Technology, Nanjing Tech University, Nanjing 210037, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiqiang","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5017-4901","authenticated-orcid":false,"given":"Caiya","family":"Yue","sequence":"additional","affiliation":[{"name":"Beijing Fangshan Human Satellite Laser National Field Scientific Observation and Research Station, Beijing 100036, China"},{"name":"School of Geography and Environment, Liaocheng University, Liaocheng 252059, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,12]]},"reference":[{"key":"ref_1","unstructured":"Schaer, S. (1999). Mapping and Predicting the Earth\u2019s Ionosphere Using the Global Positioning System. [Ph.D. Thesis, Astronomical Institute, University of Bern]."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"276","DOI":"10.1134\/S2075108722040034","article-title":"Application of Differential Code Biases in Multi-GNSS Measurements in Real-Time Precise Point Positioning","volume":"13","author":"Dolin","year":"2022","journal-title":"Gyroscopy Navig."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"577","DOI":"10.1029\/94RS00449","article-title":"Estimation of the transmitter and receiver differential biases and the ionospheric total electron content from global positioning system observations","volume":"29","author":"Sardon","year":"1994","journal-title":"Radio Sci."},{"key":"ref_4","unstructured":"Wilson, B.D., and Mannucci, A.J. (1993, January 22\u201324). Instrumental biases in ionospheric measurement derived from GPS data. Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, USA."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1315","DOI":"10.1007\/s10291-017-0613-x","article-title":"Low-cost, high-precision, single frequency GPS\u2013BDS RTK positioning","volume":"21","author":"Odolinski","year":"2017","journal-title":"GPS Solut."},{"key":"ref_6","unstructured":"Long, T., Zhang, X., Xin, L., and Chen, Y. (2012, January 15\u201319). Estimation of Compass Satellite Differential Code Biases Using Combined GPS\/Compass Observation. Proceedings of the China Satellite Navigation Conference (CSNC 2012), Guanzhou, China."},{"key":"ref_7","first-page":"102","article-title":"A multi-frequency and multi-GNSS method for the retrieval of the ionospheric TEC and intraday variability of receiver DCBs","volume":"94","author":"Li","year":"2020","journal-title":"GPS Solut."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"325","DOI":"10.1109\/TAES.1987.310829","article-title":"Ionospheric time-delay algorithm for single-frequency GPS users","volume":"AES-23","author":"Klobuchar","year":"1987","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_9","first-page":"53","article-title":"Performance of the Galileo single-frequency ionospheric correction during in-orbit validation","volume":"25","author":"Breeuwer","year":"2014","journal-title":"GPS World"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"e25","DOI":"10.1186\/BF03353138","article-title":"Efficient GPS receiver DCB estimation for ionosphere modeling using satellite-receiver geometry changes","volume":"60","author":"Hong","year":"2008","journal-title":"Earth Planets Space"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1007\/s00190-006-0093-1","article-title":"Calibration errors on experimental slant total electron content (TEC) determined with GPS","volume":"81","author":"Ciraolo","year":"2007","journal-title":"J. Geod."},{"key":"ref_12","unstructured":"Leandro, R.F., Langley, R.B., and Santos, M.C. (2007, January 23\u201325). Estimation of P2-C2 Biases by Means of Precise Point Positioning. Proceedings of the 63rd Annual Meeting of The Institute of Navigation, Cambridge, MA, USA."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1007\/s10291-015-0438-4","article-title":"A new differential code bias (C1-P1) estimation method and its performance evaluation","volume":"20","author":"Li","year":"2016","journal-title":"GPS Solut."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"765","DOI":"10.1007\/s00190-018-1194-3","article-title":"Multi-GNSS triple-frequency differential code bias (DCB) determination with precise point positioning (PPP)","volume":"93","author":"Liu","year":"2019","journal-title":"J. Geod."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1007\/s00190-015-0863-8","article-title":"An enhanced algorithm to estimate BDS satellite\u2019s differential code biases","volume":"90","author":"Shi","year":"2016","journal-title":"J. Geod."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"804","DOI":"10.1016\/j.asr.2016.07.014","article-title":"BDS satellite\u2019s differential code biases estimation based on uncombined precise point positioning with triple-frequency observable","volume":"59","author":"Fan","year":"2017","journal-title":"Adv. Space Res."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"107448","DOI":"10.1016\/j.measurement.2019.107448","article-title":"Analysis of the short-term temporal variation of differential code bias in GNSS receiver","volume":"153","author":"Liu","year":"2020","journal-title":"Measurement"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Jin, S., Wang, Q., and Dardanelli, G. (2022). A Review on Multi-GNSS for Earth Observation and Emerging Applications. Remote Sens., 14.","DOI":"10.3390\/rs14163930"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"763","DOI":"10.1134\/S001679321506016X","article-title":"Influence of GPS\/GLONASS differential code biases on the determination accuracy of the absolute total electron content in the ionosphere","volume":"55","author":"Yasyukevich","year":"2015","journal-title":"Geomagn. Aeron."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1016\/j.rinp.2014.11.002","article-title":"Variability of GPS\/GLONASS differential code biases","volume":"5","author":"Mylnikova","year":"2015","journal-title":"Results Phys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1007\/s00190-016-0962-1","article-title":"Estimation and analysis of Galileo differential code biases","volume":"91","author":"Li","year":"2016","journal-title":"J. Geod."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1002\/navi.64","article-title":"Differential code bias estimation using multi-GNSS observations and global ionosphere maps","volume":"61","author":"Montenbruck","year":"2014","journal-title":"J. Inst. Navig."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Shi, Q., and Jin, S. (2022). Variation Characteristics of Multi-Channel Differential Code Biases from New BDS-3 Signal Observations. Remote Sens., 14.","DOI":"10.3390\/rs14030594"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1007\/s10291-021-01151-w","article-title":"Characteristics of receiver-related biases between BDS-3 and BDS-2 for five frequencies including inter-system biases, differential code biases, and differential phase biases","volume":"25","author":"Mi","year":"2021","journal-title":"GPS Solut."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"3677","DOI":"10.1016\/j.asr.2022.02.037","article-title":"Accounting for biases between BDS-3 and BDS-2 overlap B1I\/B3I signals in BeiDou global ionospheric modeling and DCB determination","volume":"69","author":"Zheng","year":"2022","journal-title":"Adv. Space Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"259","DOI":"10.5194\/angeo-34-259-2016","article-title":"Assessment of BDS differential code bias variations from multi-GNSS network observations","volume":"34","author":"Jin","year":"2016","journal-title":"Ann. Geophys."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"5802214","DOI":"10.1109\/TGRS.2023.3298574","article-title":"A two-step estimation of GPS differential code biases and local ionospheric TEC based on orthogonal transformation","volume":"61","author":"Wijaya","year":"2023","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Wang, Q., Jin, S., and Ye, X. (2022). A Novel Method to Estimate Multi-GNSS Differential Code Bias without Using Ionospheric Function Model and Global Ionosphere Map. Remote Sens., 14.","DOI":"10.3390\/rs14092002"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Wang, Q., Zhu, J., and Feng, H. (2023). Ionosphere Total Electron Content Modeling and Multi-Type Differential Code Bias Estimation Using Multi-Mode and Multi-Frequency Global Navigation Satellite System Observations. Remote Sens., 15.","DOI":"10.3390\/rs15184607"},{"key":"ref_30","first-page":"425","article-title":"Stability Analysis of BDS-3 Satellite Differential Code Bias and Its Impacts on Single Point Positioning","volume":"48","author":"Yuan","year":"2023","journal-title":"Geomat. Inf. Sci. Wuhan Univ."},{"key":"ref_31","first-page":"499","article-title":"Long-term Variation of Differential Code Biases of Ionospheric TEC Monitor Based on Hardward Signal Simulator","volume":"41","author":"Liu","year":"2021","journal-title":"J. Space Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1007\/s10291-020-01034-6","article-title":"Understanding long-term variations in GPS differential code biases","volume":"24","author":"Xiang","year":"2020","journal-title":"GPS Solut."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"905","DOI":"10.1007\/s10291-016-0577-2","article-title":"2017 Analysis of satellite-induced factors affecting the accuracy of the BDS satellite differential code bias","volume":"21","author":"Bao","year":"2017","journal-title":"GPS Solut."},{"key":"ref_34","first-page":"429","article-title":"Characteristic Analysis of Satellite DCB Products Provided by CAS and DLR","volume":"40","author":"Cui","year":"2020","journal-title":"Prog. Astron."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1115","DOI":"10.5194\/angeo-38-1115-2020","article-title":"Epoch-by-epoch estimation and analysis of BeiDou Navigation Satellite System (BDS) receiver differential code biases with the additional BDS-3 observations","volume":"38","author":"Wang","year":"2020","journal-title":"Ann. Geophys."},{"key":"ref_36","first-page":"18","article-title":"Precision Single Point Positioning Accuracy Analysis of BDS-3 New Frequencies Based on OSB Correction","volume":"43","author":"Gu","year":"2023","journal-title":"Geod. Geodyn."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s00190-020-01404-5","article-title":"GPS and GLONASS observable-specific code bias estimation: Comparison of solutions from the IGS and MGEX networks","volume":"94","author":"Wang","year":"2020","journal-title":"J. Geod."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1007\/s10291-021-01139-6","article-title":"Estimation and analysis of multi-GNSS observable-specific code biases","volume":"25","author":"Deng","year":"2021","journal-title":"GPS Solut."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1007\/s10291-023-01448-y","article-title":"Data+ pilot biases in modern GNSS signals","volume":"27","author":"Montenbruck","year":"2023","journal-title":"GPS Solut."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1186\/s43020-023-00103-8","article-title":"Estimation of BDS pseudorange biases with high temporal resolution: Feasibility, affecting factors, and necessity","volume":"4","author":"Su","year":"2023","journal-title":"Satell. Navig."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1007\/s10291-023-01417-5","article-title":"Two modified multi-frequency GNSS approaches to estimate the pseudorange observable-specific signal bias for the CDMA and FDMA models","volume":"27","author":"Su","year":"2023","journal-title":"GPS Solut."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1016\/j.asr.2019.10.014","article-title":"Multi-GNSS contributions to differential code biases determination and regional ionospheric modeling in China","volume":"65","author":"Ren","year":"2020","journal-title":"Adv. Space Res."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"541","DOI":"10.1007\/s10291-012-0279-3","article-title":"M_DCB: Matlab code for estimating GNSS satellite and receiver differential code biases","volume":"16","author":"Jin","year":"2012","journal-title":"GPS Solut."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1007\/s00190-010-0367-5","article-title":"GPS slant total electron content accuracy using the single layer model under different geomagnetic regions and ionospheric conditions","volume":"84","author":"Brunini","year":"2010","journal-title":"J. Geod."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Wang, Y., Zhao, L., and Gao, Y. (2021). Estimation and Analysis of GNSS Differential Code Biases (DCBs) Using a Multi-Spacing Software Receiver. Sensors, 21.","DOI":"10.3390\/s21020443"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"93","DOI":"10.2478\/v10018-012-0001-2","article-title":"The Problem of Compatibility and Interoperability of Satellite Navigation Systems in Computation of User\u2019s Position","volume":"46","author":"Januszewski","year":"2011","journal-title":"Artif. Satell."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"25","DOI":"10.15406\/aaoaj.2021.05.00124","article-title":"A study on compatibility and interoperability among multi-GNSS","volume":"5","author":"Sarkar","year":"2021","journal-title":"Aeronaut. Aerosp. Open Access J."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"58487","DOI":"10.1109\/ACCESS.2021.3073317","article-title":"Optimal parameter design of continuous phase modulation for future GNSS signals","volume":"9","author":"Sun","year":"2021","journal-title":"IEEE Access"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"446","DOI":"10.1017\/S0373463320000594","article-title":"Availability analysis of GNSS signals above GNSSs constellation","volume":"74","author":"Yang","year":"2021","journal-title":"J. Navig."},{"key":"ref_50","unstructured":"Altman, D.G., Machin, D., Bryant, T.N., and Gardner, M.J. (2000). Statistics with Confidence, BMJ Books. [2nd ed.]."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Zhang, Q., Zhu, Y., and Chen, Z. (2021). An In-Depth Assessment of the New BDS-3 B1C and B2a Signals. Remote Sens., 13.","DOI":"10.3390\/rs13040788"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"025001","DOI":"10.1088\/1361-6501\/ab41cf","article-title":"Improving BDS-2 and BDS-3 joint precise point positioning with time delay bias estimation","volume":"31","author":"Jiao","year":"2019","journal-title":"Meas. Sci. Technol."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/22\/4217\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T16:30:57Z","timestamp":1760113857000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/22\/4217"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,11,12]]},"references-count":52,"journal-issue":{"issue":"22","published-online":{"date-parts":[[2024,11]]}},"alternative-id":["rs16224217"],"URL":"https:\/\/doi.org\/10.3390\/rs16224217","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,11,12]]}}}