利用三频数据组合探测不敏感周跳

Using Triple-Frequency Data Combination to Detect Insensitive Cycle-Slip

针对全球卫星导航系统(Global Navigation Satellite System, GNSS)信号中部分周跳难以探测的问题,在三维坐标系中分析了不敏感周跳的产生及分布,研究了探测阈值对不敏感周跳的影响,进而研究了多个组合量联合探测周跳的效果,提出了针对不敏感周跳的组合系数选取方法。该方法根据不敏感周跳的探测量构建组合系数的函数模型,在所有可能的三频无几何相位(geometry free combination, GF)组合系数中选取最敏感的组合系数,可探测3个频点上跳变量相近的不敏感周跳。北斗三频实测数据证实,多个GF组合有效提升了不敏感周跳的探测概率,数量以两个为宜,选取的组合量有效提升了不敏感周跳的探测概率。

For the issues of detecting insensitive cycle-slip in GNSS signals, this paper analyzes the generation and distribution of insensitive cycle-slip in three-dimensional coordinate system, researches the influence of the detection threshold on detecting insensitive cycle-slip, and then studies the effect of combined detection of combinations. A combination coefficient selection method is proposed for detecting insensitive cycle-slip. This method builds a function model based on the detection amount of combined coefficient, and screening the most sensitive combination coefficients. The method can detect insensitive cycle-slip with similar hop variables at three frequencies. As verified by the BeiDou triple-frequency measured data, multiple GF combinations effectively increase the detection probability of insensitive cycle-slip, and the appropriate number is two. The combination selected by proposed method effectively detect the manually added insensitive cycle-slip.