电离层残差法对载波相位周跳探测的改进

针对传统电离层残差法在实际数据处理中的缺陷，提出了一种电离层残差与高次差结合的改进型周跳探测方法。该改进方法首先借鉴高次差的高通滤波特性，对电离层残差的组合观测值求一次差，从而有效抑制低频信号并消除常数部分，使实际发生的周跳影响放大，再结合组合观测值的方差进行周跳探测。算法验证表明该方法不论对“北斗”卫星不同星座的数据还是对全球定位系统( GPS)卫星的数据均有良好的探测效果，弥补了原电离层残差法在电离层活跃期间以及数据质量不佳时其不易有效探测出小周跳的缺陷，且避免了原算法经常出现误判断的情况，使其成为一种较优的周跳探测方法。

Improvement of ionosphere residual method in carrier phase cycle-slip detection

Considering the shortcomings of the traditional ionosphere residual method in practical data processing,this paper proposes an improved cycle slip detection method for ionosphere residuals combined with higher difference. Firstly,according to the high pass filtering characteristics of high-order difference method,the new method calculates the 1st-order difference of the combined observation value of ionosphere residuals so as to effectively suppress the low-frequency signal and amplify the impact of cycle slips. Secondly,a new criteria of cycle-slip detection is established based on differential value from the first step. Algorithm validation shows that the improved algorithm has better detection effect regardless of the Beidou navigation satellite system(BDS) data or the GPS satellite data,and makes up the defect that the original algorithm can not detect small cycle-slip effectively when the ionosphere is active and the data quality is poor.It avoids misjudgment that original algorithm often makes and is a better algorithm in cycle-slip detection.