Traditional double‐difference approach can’t deal with FDMA system of GLONASS ,in which different satellite has different wave length ,and different hardware delay .A new method based on single‐difference ambiguity parameters is proposed in this paper .Individual ambiguity parameter is set for each satellite ,and the hardware delay difference is parameterized .Data process results have indicated that ,using the proposed approach ,the Glonass ambiguity can be easily fixed ,and comparable position precision with GPS can be achieved .%采用频分多址技术(FDMA),GLONASS系统双差模糊度固定存在两个问题:不同卫星波长不一致,双差后不能保持模糊度整数特性;共视卫星频率不同,不同卫星之间存在大小不同的频间偏差(IFB )。传统的双差不能很好处理GLONASS相对定位模糊度固定问题。文中考虑将双差所涉及的两颗卫星的站间单差模糊度分别求解,不受共视卫星波长不一致的影响。同时采用参数估计法消除不同厂商接收机的频间偏差影响。试验结果表明采用文中方法可以正确固定GLONASS模糊度,并且达到与GPS相当的解算精度,GPS/GLONASS组合定位精度和可靠性也比G PS单系统有所提高。
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