{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:51:42Z","timestamp":1760241102129,"version":"build-2065373602"},"reference-count":16,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2019,12,5]],"date-time":"2019-12-05T00:00:00Z","timestamp":1575504000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Compared with the previous GPS satellites, the first GPS III satellite adds a new civil signal L1C to the signal components of the L1 frequency in addition to the improvement of positioning accuracy, anti-interference ability, and service life. The selection and combination of signal modulation and multiplexing methods will affect the power ratio and phase relationship in the process of signal transmission. In the distribution of constellation of different modulation modes, the signal amplitudes of different signal constellation points will be affected by the nonlinear amplifiers of satellites. The analysis can assess its impact on navigation performance. The iGMAS monitoring and evaluation center of the 54th Research Institute of China Electronics Technology Group Corporation uses the low-distortion data acquisition and processing platform and refined signal software receiving processing algorithm of the iGMAS monitoring and evaluation center to complete the signal acquisition of the first satellite of GPS III over China, and processes accordingly for its signal modulation mode. Compared with the previous generation GPS of old system signals, it is found that the GPS signal of the new system not only adds the L1C frequency, but also the constant envelope multiplexing mode of the L1 frequency signal, and the power ratio of the internal signal components are also adjusted.<\/jats:p>","DOI":"10.3390\/s19245360","type":"journal-article","created":{"date-parts":[[2019,12,5]],"date-time":"2019-12-05T11:16:31Z","timestamp":1575544591000},"page":"5360","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Analysis of the Multiplexing Method of New System Navigation Signals of GPS III First Star L1 Frequency in China\u2019s Regional"],"prefix":"10.3390","volume":"19","author":[{"given":"Hongjun","family":"Ye","sequence":"first","affiliation":[{"name":"School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China"}]},{"given":"Xiaojun","family":"Jing","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"}]},{"given":"Liang","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China"}]},{"given":"Shuo","family":"Hao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China"}]},{"given":"Baoguo","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,5]]},"reference":[{"key":"ref_1","unstructured":"Xie, G. (2013). Principles of Global Navigation Satellite System GPS, GLONASS and Galileo System, Publishing House of Electronics Industry."},{"key":"ref_2","unstructured":"Betz, J.W., Blanco, M.A., and Cahn, C.R. (2006, January 26\u201329). Description of the L1C signal. Proceedings of the ION GNSS-2006, Fort Worth, TX, USA."},{"key":"ref_3","first-page":"2285","article-title":"Design ideals summary of GPS and Galileo signal system","volume":"31","author":"Hu","year":"2009","journal-title":"Syst. Eng. Electr."},{"key":"ref_4","unstructured":"Thoelert, S., Erker, S., and Meuere, M. GNSS signal verification with a high gain antenna Calibration strategies and high quality signal assessment. Proceedings of the International Technical Meeting-2009, Anaheim, CA, USA."},{"key":"ref_5","unstructured":"Spilker, J.J., and Orr, R.S. (1998, January 5\u201318). Code multiplexing via majority logic for GPS modernization. Proceedings of the 11th International Technical Meeting of the Satellite Division of the Institute of Navigation, Nashville, TN, USA."},{"key":"ref_6","unstructured":"Tang, Z.P. (2009). Theoretical Research on GNSS Signal Design and Evaluation, Huazhong University of Science and Technology."},{"key":"ref_7","unstructured":"Hein, G.W. (2005, January 24\u201326). Performance of a Galileo PRS\/GPS M-code combined service. Proceedings of the 2005 National Technical Meeting of The Institute of Navigation, San Diego, CA, USA."},{"key":"ref_8","first-page":"60","article-title":"Satellite navigation signal quality monitoring system and application","volume":"34","author":"Wang","year":"2009","journal-title":"Glob. Position Syst."},{"key":"ref_9","unstructured":"Partridg, M.D., and Dafesh, P.A. (2001, January 11\u201314). Code power measurement methodology for GPS Block IIR-M and IIF on-orbit test procedures. Proceedings of the International Technical Meeting of the Satellite Division of the Institute of Navigation, Salt Lake City, UT, USA."},{"key":"ref_10","first-page":"1258","article-title":"Blind monitoring and parameter estimation of non-cooperative navigation signals","volume":"21","author":"Luo","year":"2011","journal-title":"High Tech Commun."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1002\/j.2161-4296.2001.tb00247.x","article-title":"Binary Offset Carrier Modulations for Radio Navigation","volume":"48","author":"Betz","year":"2001","journal-title":"Navig.-J. Inst. Navig."},{"key":"ref_12","first-page":"528","article-title":"Research on quality analysis method of GNSS spatial signal","volume":"40","author":"Lu","year":"2010","journal-title":"China Sci. Phys. Mech. Astron."},{"key":"ref_13","unstructured":"Yao, Z., and Lu, M.Q. (2013, January 28\u201330). Constant envelope combination for components on different carrier frequencies with unequal power allocation. Proceedings of the International Technical Meeting of the Institute of Navigation, San Diego, CA, USA."},{"key":"ref_14","unstructured":"Betz, J.W. (1999, January 25\u201327). The offset carrier modulation for GPS modernization. Proceedings of the ION NTM 99, San Diego, CA, USA."},{"key":"ref_15","unstructured":"Dafesh, P.A., and Nguyen, T.M. (1999, January 25\u201327). Coherent adaptive subcarrier modulation (CASM) for GPS modernization. Proceedings of the 12th National Technical Meeting of the Institute of Navigation, San Diego, CA, USA."},{"key":"ref_16","unstructured":"Wang, G.H., Lin, V.S., and Fan, T. (2004, January 21\u201324). Study of signal combining methodologies for GPS III flexible navigation payload. Proceedings of the 17th International Technical Meeting of the Satellite Division of the Institute of Navigation, Long Beach, CA, USA."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/24\/5360\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T13:40:24Z","timestamp":1760190024000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/24\/5360"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,12,5]]},"references-count":16,"journal-issue":{"issue":"24","published-online":{"date-parts":[[2019,12]]}},"alternative-id":["s19245360"],"URL":"https:\/\/doi.org\/10.3390\/s19245360","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2019,12,5]]}}}