较多研究目前被针对观测数据的周跳探测方法而开展，而常用方法有多普勒频移

Much research is currently being carried out on the cycle slip detection method of observation data, and the commonly used methods include Doppler frequency shift method, high-order difference method, Doppler observation value method, MW combination method, ionospheric residual method, etc. However, less research has been carried out on three-frequency cycle slip detection methods, mainly including three-frequency phase pseudorange combination method, three-frequency non-geometric deionospheric combination method, and three-frequency non-geometric phase combination method.

More studies are currently carried out on the weekly hop detection method of observation data, while the common methods are Doppler frequency shift method, high sub-difference method, Doppler observation method, M-W combination method, ionosphere residual method and so on. However, less research is carried out on the three-frequency perimeth hop detection method, mainly the three-frequency phase pseudo-distance combination, three-frequency non-geometric anti-ionosphere combination and three-frequency non-geometric phase combination.

At present, many researches have been carried out on cycle slip detection methods of observation data, and common methods include Doppler frequency shift method, high order difference method, Doppler observation value method, M-W combination method, ionospheric residual method, etc. However, few studies have been carried out on three frequency cycle slip detection methods, such as triple frequency phase pseudo range combination method, triple frequency geometric ionosphere elimination method and triple frequency non geometric phase combination method.<br>