测绘学报 ›› 2021, Vol. 50 ›› Issue (2): 169-180.doi: 10.11947/j.AGCS.2021.20200159

• 大地测量学与导航 • 上一篇    下一篇

三频非组合模型的GPS/BDS/Galileo精密定轨

曾添1,2,3, 隋立芬2, 阮仁桂3,4, 贾小林3,4, 肖国锐2   

  1. 1. 93216部队, 北京 100085;
    2. 信息工程大学, 河南 郑州 450001;
    3. 地理信息工程国家重点实验室, 陕西 西安 710054;
    4. 西安测绘研究所, 陕西 西安 710054
  • 收稿日期:2020-04-24 修回日期:2020-07-29 发布日期:2021-03-03
  • 作者简介:曾添(1992-),男,博士,工程师,研究方向为卫星精密定轨与定位。E-mail:tattian@126.com
  • 基金资助:
    国家自然科学基金(41674016;41704035;41874041;41904039);地理信息工程国家重点实验室基金(SKLGIE2018-M-2-1)

GPS/BDS/Galileo precise orbit determination using triple-frequency uncombined observation model

ZENG Tian1,2,3, SUI Lifen2, RUAN Rengui3,4, JIA Xiaolin3,4, XIAO Guorui2   

  1. 1. Troops 93216, Beijing 100085, China;
    2. Information Engineering University, Zhengzhou 450001, China;
    3. State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China;
    4. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China
  • Received:2020-04-24 Revised:2020-07-29 Published:2021-03-03
  • Supported by:
    The National Natural Science Foundation of China (Nos. 41674016;41704035;41874041;41904039);The Open Fund of the State Key Laboratory of Geo-Information Engineering (No. SKLGIE2018-M-2-1)

摘要: 四大GNSS导航卫星系统发播三频及以上观测数据成为必然趋势。本文基于IGS钟差基准研究了三频非组合(UC)精密定轨模型及其模糊度固定方法。将载波相位硬件延迟分成时变和时不变参数,并进行参数重组,得到三频非组合定轨观测模型;类似精密定位中的超宽巷、宽巷、窄巷的分步模糊度固定策略,使用双差法推导了三频非组合模糊度固定方法。以发射三频信号的GPS ⅡF、BDS-2、Galileo卫星为例,进行1/2频点消电离层组合(IF)定轨、1/3频点IF定轨、1/2频点UC定轨和三频UC定轨共4种方案进行试验,使用外部轨道产品、天边界连接点、卫星激光测距3个手段对定轨结果进行验证,评定第三频点对轨道、钟差及其他参数的贡献。结果表明第3频点观测量对精密定轨贡献很小(不到5%);同时发现GPS三频定轨较L1/L2双频定轨可将定轨产品精度提升10%左右,原因可能是L5较L2频点具有更高的码片率和信号功率。

关键词: 精密轨道确定, GNSS, 三频, 模糊度固定, 非组合模型

Abstract: The navigation satellite of the four global navigation satellite system (GNSS) transmitting multi-frequency signals becomes a prevailing trend. In this contribution, a triple-frequency (TF) uncombined (UC) precise orbit determination (POD) method based on IGS clock datum is developed and its ambiguity resolution strategy is proposed. The hardware delay of carrier phase is divided by time-invariant and variant components. Then the UC observation model is given by re-parameterizing the unknown parameters. The step-by-step ambiguity fixing method, i.e. the extra-wide-lane, wide-lane and narrow-lane ambiguities fixed in sequence, is deduced by using double-differenced ambiguities in a network. With the GPS ⅡF, BDS-2 and Galileo being able to transmit triple-frequency signals, the four POD tests are conducted: ionospheric-free (IF) POD of frequency 1/2, IF POD of frequency 1/3, UC POD of frequency 1/2, UC POD of TF signals. The three metrics of external orbit product, day boundary discontinuities and satellite laser ranging are used to validate the POD product accuracy. Results show that a subtle improvement are received with the addition of the third frequency observations. However, the improvement of GPS TF POD results with respect to L1/L2 POD is about 10%, which may be the signal power of L5 is stronger than that of L2.

Key words: precise orbit determination, GNSS, triple-frequency, ambiguity resolution, uncombined model

中图分类号: