针对在CORS系统初始化后,周跳的出现将严重影响移动用户定位精度,CORS网中基站坐标已知,可精确预报对流层、电离层等系统误差,以及整周模糊度确定的特点,分析了周跳对双差模型的影响,通过分析普通卫星产生的周跳仅对一个双差观测方程产生影响,可以作为粗差,参考卫星的周跳会引入所有观测方程,从而对模型产生系统性误差,进而提出了使用附有系统参数的抗差估计方法,对CORS基站中的载波观测值进行整体平差,根据改正数V判断普通卫星的周跳,根据系统参数x2判断参考卫星的周跳.实验表明,该方法能将所有可见卫星进行整体的周跳探测,并且能实现高度角低于10°时的周跳探测和修复.%In view that the cycle slip, occurred after CORS system initialization, would significantly influence the positioning accuracy of mobile subscriber, this paper presents an cycle-slip detection and repair algorithm based on robust estimation. It is based on the characteristics of CORS network, such as the true coordinates of the reference stations are known, the systemic errors (for examples, the tropospheric and ionospheric effects) can be accurately predicted, and the integer ambiguity after initializing is known. The effects of the cycle slips in double differential model( I.e. The slips of common satellite lead to gross error and the slips of reference satellite lead to systematic errors) are studied. In this algorithm, the adjustment algorithm is used in single epoch, the slips of common satellite can be found in the residuals V, and the slips of reference satellite can be found in the systematic parameter x2. The test results show that this algorithm is effective even for the satellite with <10° elevation angle.
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