基于双频载波和高次差法的周跳探测与修复

A New Cycle Slip Detection and Correction Method with Dual-frequency Carrier Phase Observation and High-order Difference

采用载波无几何组合和星间单差无电离层组合的历元间高次差作为周跳检验量,因组合观测值中不包含伪距,其理论噪声与波长相比几乎可以忽略。利用两种组合观测值联合进行周跳探测,可避免各自的探测盲点。将两个载波组合联立进行周跳的求解,由于组合噪声较小,直接取整即可求得周跳的大小。提出的方法在一定程度上克服了传统周跳探测与修复算法中,由于引入伪距带来的探测能力不强、修复精度不高等问题。通过对IGS站观测数据模拟周跳探测与修复情况的统计,新提出算法的周跳探测成功率为99%,周跳修复成功率为94%。

The high difference between the epoches of geometry-free combination and single-difference ionosphere-free combination between satellites is chosen as the detection criterion,and because the pseudo-range is not included in the combination observation,the theoretical noise can be ignored when compared to the wavelength. Blind spots can be avoided and reparation also can be made with join processing of two combinations.Cycle slips can be decided directly with float value rounding to the nearest integer for their lownoise level. The lowdetection capability and reparation accuracy caused by the pseudo-range in traditional methods can be improved with the proposed method. Results on IGS observations showthat success rate of detection and reparation in simulated cycle slips can achieve 99% and 94% respectively.