Using the advantage that triple-frequency extra-widelane or widelane ambiguities have much longer wavelength and thus are easy to be fixed,a new network RTK (real-time kinematic)single-epoch positioning method based on BDS widelane combinations is proposed.The data processing center uses reference stations to calculate and broadcast the real-time vi rtual observations including double difference (DD)tropospheric and ionospheric delay correction.Then using single-satel l ite-pai r and single-epoch mode,two extra-widelane or widelane ambiguities are resolved rel iably by carrier-pseudo combination and TCAR (three-carrier ambiguity resolution ) method at the rover station.Final ly, the ambiguity-fixed widelane observations with the minimum observation noise and the broadcast atmospheric correction are used together to calculate the real-time kinematic positioning results.Experimental results show that the correct rates of single-epoch widelane ambiguity resolution at rover stations are larger than 99.9%.The statistical positioning error in plane is 3-4 cm,and the error in up di rection is about 5 cm.%利用三频超宽巷/宽巷模糊度波长较长从而易于固定的优势,提出了一种基于北斗三频宽巷组合的网络 RTK 单历元定位方法.数据处理中心利用基准站实时生成并播发包含双差对流层和电离层延迟改正信息的虚拟观测值；用户站利用载波、伪距组合及分步解算的 TCAR 方法基于单个卫星对、单历元可靠固定两个超宽巷或宽巷模糊度.最后利用已固定模糊度且噪声最小的宽巷观测值和内插得到的大气延迟改正进行实时动态定位解算.试验结果表明,对于本文提出的网络 RTK 单历元定位方法,用户站宽巷模糊度单历元解算准确率高于99．9％,统计的定位中误差平面为3~4 cm,高程方向约为5 cm.
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