The algorithm of integer ambiguity resolution between long-range （typically 100-200 kin） base stations at single-epoch is proposed. The wide-lane ambiguities are determined by linear relationship between carrier phase ambiguities. In order to reduce the residuals of non-divergent error in carrier phase ambiguities resolution, a new idea of reselecting base satellite by elevation is used. Then candidates of double frequency carrier phase ambiguities can be selected by fixed double difference wide-lane ambiguities. The double difference carrier phase ambiguities are searched and fixed through the computation of non-divergent error＊s residual. This algorithm was tested, and the advantages of this method are rapid, stable. This algorithm avoids the effect of cycle clips. The double difference integer ambiguity between long-range base stations can be fixed at single-epoch.%提出一种长距离（100-200km）网络RTK基准站间的整周模糊度单历元确定方法。该方法首先利用载波相位模糊度间的线性约束关系对双差宽巷模糊度进行搜索。为了减小非弥散误差残差对载波相位模糊度解算的影响，采用了一种新的根据高度角重新选择基准卫星的方法。然后根据双差宽巷模糊度选取双频栽波相位模糊度的备选组合，利用基准站问非弥散误差残差的计算值对双差载波相位模糊度进行搜索和确定。经试验算例的验证，该方法快速、稳定，不受周跳影响，只需一个历元的观测数据即可确定长距离基准站间的双差整周模糊度。
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