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香港地区非差非组合PPP-RTK定位性能评估

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为探究非差非组合(UDUC)PPP-RTK模型定位性能,基于香港连续运行参考网(CORS)数据进行分析研究.首先采用服务端PPP-RTK模型处理参考网观测数据,得到对应区域的卫星、大气产品;随后用户站基于网端产品进行解算,得到各历元的位置结果;最后将PPP-RTK解算结果与单基线电离层加权(IW)RTK模型和电离层浮点(IF)RTK模型处理结果进行比较分析.结果表明,在大气产品约束下,PPP-RTK模型的单历元解算结果能达到99％以上的模糊度固定成功率,固定解的平面精度、垂直精度分别优于1、4 cm;多历元解算(静态仿动态)在任意时间均能实现首历元固定模糊度,固定解的平面精度、垂直精度分别优于1、2 cm.在没有大气约束的条件下,PPP-RTK静态仿动态解算在2～5 min内实现模糊度首次固定.经过比较,UDUC PPP-RTK在定位精度、模糊度固定成功率、模糊度固定速度面均远优于单基线IW RTK和IF RTK模型,可实现全天候、可靠的、实时动态的高精度绝对定位,在国防建设、交通运输、精密农业等领域具有更加广泛的应用前景.
Positioning performance assessment of undifferenced and uncombined PPP-RTK in Hong Kong region
To investigate the positioning performance of the undifferenced and uncombined (UDUC) PPP-RTK model,the data from Continuously Operating Reference Stations (CORS) in Hong Kong are analyzed. Firstly,the PPP-RTK network model is used to process observation data of reference network to obtain satellite and atmospheric products. After obtaining the network products,user stations calculated their own position results. Finally,the PPP-RTK results are compared with the results of the single baseline ionosphere weighted (IW) RTK and ionosphere float (IF) RTK model. For instantaneous results,with the constraint of atmospheric products,the ambiguity success rate of PPP-RTK model is above 99％ and the position accuracy can reach 1cm and 4 cm in horizontal and vertical directions,respectively. For filter results (simulated kinematic),with the constraint of atmospheric products,PPP-RTK model can fix the ambiguity at the first epoch and the position accuracy can achieve 1cm and 2 cm in horizontal and vertical directions respectively. Without atmospheric constraint,the time to first fix (TTFF) of PPP-RTK model could achieve 2～5 minutes. It proves the performance of UDUC PPP-RTK is better than single baseline IW RTK and IF RTK models in positioning accuracy,ambiguity success rate and TTFF. It can provide all-weather,reliable,real-time kinematic and high-precision positioning service,and has a wide application in the fields of national defense construction,transportation,precision agriculture and so on.

undifferenced and uncombinedprecise point positioning (PPP)-real time kinematic (RTK)BeiDou navigation satellite (regional) system (BDS-2)ionosphere weighted

钟海林、张宝成、高睿

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中国科学院 精密测量科学与技术创新研究院,武汉 430017

中国科学院大学 地球与行星科学学院,北京 100049

非差非组合 精密单点定位(PPP)-实时动态差分定位(RTK) 北斗卫星导航(区域)系统即北斗二号(BDS-2) 电离层加权

国家自然科学基金项目国家自然科学基金项目湖北省重点研发计划湖北省国际科技合作项目

41774042421740342020BHB0142023EHA004

2024

10.16547/j.cnki.10-1096.20240204

导航定位学报

导航定位学报

CSTPCD北大核心
影响因子：0.72
ISSN：
年,卷(期)：2024.12(2)
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