伪距相位和无几何相位组合探测与修复多频周跳的比较

Comparison of Cycle Slip Detection and Repair of Multiple-Frequency Based on Code-Phase and Geometry-Free Combination

基于三频伪距相位和无几何相位组合周跳探测与修复的基本原理,分别推导周跳探测的阈值条件,研究组合量的优化选取模型;以组合量标准差最小为原则并综合历元间电离层延迟误差,选取适合于北斗三频数据的伪距相位和无几何相位组合。实验结果表明,两种方法均能实时探测和修复所有模拟的周跳;综合算法计算量、复杂性和舍入误差,首选伪距相位组合法。

This research examines cycle slip detection and repair theory of triple-frequency pseudo-range phase combination and geometry-free combination. Their thresholds are deduced, and the optimum selection method of combinations is investigated. Based on the smallest variance of combinations, and taking ionosphere delay errors during each epoch into consideration, these two combinations fit for BDS triple-frequency data are se- lected. Finally, BDS data is used in the experiment to validate these two algorithms. The result shows that these two algorithms can detect and repair all the simulated cycle slips in real-time. Taking amount of calculation, complexity and rounding error into account, pseudo-range phase combination is recommended.