The Theory Research And Software Realization Of GNSS Cycle Slip Detection And Correction

High-precision GNSS measurements technology is a hot issue in the field of measurement currently. With the continuous improvement of the mathematical model for GNSS fusion technology,multi-system positioning has been used widely.At present.The main positioning modes are relative positioning and single point positioning. The detection and correaction of cycle slips and fixed ambiguities are necessary to be sloved.Then we can achieve high precision positioning, cycle slips is always one of the main factors affecting the accuracy of satellite positioning.this article analyzes the data preprocessing of the two positioning patterns on the detection and correaction of cycle slips.From the Ambiguity of non-difference carrier phase data and double difference carrier phase data on cycle slips.we study and improve the detection Method of common cycle slips in GPS to slove the detection and correaction of cycle slips on multi-system. This article main research content is as follows:(1) An improved polynomial fitting algorithm was proposed, this algorithm based on sliding one-by-one epoch window of polynomial fitting of robust estimation use median to compute priori weight, experimental results shows that improved polynomial fitting algorithm is effective.(2) From the perspective of multi-system, experimental results based on measured data in different conditions shows that ionosphere residual method can detect 1 cycle slip in GPS/GLONASS/BDS.(3) An improved kalman filter algorithm was proposed,this improved algorithm take into account of the thoughts of robust estimation, experimental results shows that improved algorithm is effective.(4) A new combined method of detection cycle slips was proposed,generally speaking, which combine cycle slips detection and correction for wide-lane GNSS data based on Robust Kalman Filtering method with ionosphere residual error method. experimental results shows that this algorithm is effective and can detect 1 cycle slip in non-difference carrier phase data.(5) From the perspective of multi-system, a strategy was proposed to choose the best method used to detect and correct cycle slips.(6) A procedure was developed with C#, the procedure can detect and correct cycle slips for both non-difference carrier phase data and double difference carrier phase data.