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LI Bo, CHENG Pengfei, BI Jinzhong, XU Yantian, ZHU Huizhong, GAO Meng, GU Shouzhou. An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200555
Citation: LI Bo, CHENG Pengfei, BI Jinzhong, XU Yantian, ZHU Huizhong, GAO Meng, GU Shouzhou. An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200555

An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations

doi: 10.13203/j.whugis20200555
Funds:

Fees for basic scientific research of Chinese Academy of surveying and Mapping(AR1903)

  • Received Date: 2020-10-16
  • An undifferenced and uncombined integer ambiguity resolution method between BDS long-range reference stations is proposed. Firstly, the error observation equation is established directly by using the observations of different frequencies, and the relative zenith tropospheric wet delay error and ionospheric delay error are estimated by random walk strategy to increase the constraint between epochs. Then a linear calculation method of undifferenced integer ambiguity real-time is used to obtain the undifferenced integer ambiguity of all satellites in the current epoch of the reference network. It solves the problem that Ambiguity needs to be inherited or re-superimposed on normal equations in the reference star transformation. Because the information of each frequency observation is fully utilized, the influence of linear combination amplification noise on integer ambiguity fixing is avoided, and the ambiguity fixing success rate of uncombined method is much higher than that of ionosphere-free combination method. The results show that the average fixed speed of ambiguity of each reference station is 20 epochs. The integer ambiguity resolution of the carrier phase of the reference station can be realized quickly.
  • [1] Deng C, Tang W, Liu J, et al. Reliable single-epoch ambiguity resolution for short baselines using combined GPS/BeiDou system[J]. GPS Solutions, 2014, 18(3):375-386.
    [2] ZOU Xuan, Wang Yawei, Deng Chenlong, et al. Instantaneous BDS + GPS undifferenced NRTK positioning with dynamic atmospheric constraints[J]. Gps Solutions, 2018, 22(1):17-28.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations

doi: 10.13203/j.whugis20200555
Funds:

Fees for basic scientific research of Chinese Academy of surveying and Mapping(AR1903)

Abstract: An undifferenced and uncombined integer ambiguity resolution method between BDS long-range reference stations is proposed. Firstly, the error observation equation is established directly by using the observations of different frequencies, and the relative zenith tropospheric wet delay error and ionospheric delay error are estimated by random walk strategy to increase the constraint between epochs. Then a linear calculation method of undifferenced integer ambiguity real-time is used to obtain the undifferenced integer ambiguity of all satellites in the current epoch of the reference network. It solves the problem that Ambiguity needs to be inherited or re-superimposed on normal equations in the reference star transformation. Because the information of each frequency observation is fully utilized, the influence of linear combination amplification noise on integer ambiguity fixing is avoided, and the ambiguity fixing success rate of uncombined method is much higher than that of ionosphere-free combination method. The results show that the average fixed speed of ambiguity of each reference station is 20 epochs. The integer ambiguity resolution of the carrier phase of the reference station can be realized quickly.

LI Bo, CHENG Pengfei, BI Jinzhong, XU Yantian, ZHU Huizhong, GAO Meng, GU Shouzhou. An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200555
Citation: LI Bo, CHENG Pengfei, BI Jinzhong, XU Yantian, ZHU Huizhong, GAO Meng, GU Shouzhou. An Algorithm for Ambiguity Resolution of BDS Undifferenced and Uncombined Long-range Reference Stations[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200555
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