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Automated cycle-slip detection and correction for GPS triple-frequency undifferenced observables

FAN Jian-jun,WANG Fei-xue,GUO Gui-rong(Satellite Navigation R&D Center,School of Electrionic Science and Engingeering,National University of Defence Technology,Changsha Hunan China,410073)  
In the process of GPS triple frequency observables,the rms of the integer ambiguity isn't fit for detecting and correcting cycle slips for the pseudo-range noise.The noise will be reduced with a simple running average filter or a process of combination for the raw observables.It is recommended that selecting observables after a running average filter or combination as a detection observable can detect and correct cycle slips for single frequency.Four principles are proposed for constructing detection observables and three geometry-free linear combinations are chosen according to these principles.Cycle slips can be detected and corrected for triple-frequency undifferenced observables with these selected detection observables.
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