Research On Cycle Slip Detection And Repairing Method Of Dual-frequency GPS

GPS,GLONASS,Galileo,Compass and other global satellite navigation and positioning system "modernization plan" continue to advance and improve the multi-frequency data combination because of its more excellent features are more and more widely used.Among them,in the cycle detection and repair process,multi-frequency data through a combination of different ways to form a combination of test compared to the traditional single,double frequency cycle test,the detection accuracy is higher.In this paper,based on the implementation of GPS single-track,double-frequency cycle detection method,based on the multi-frequency data combination wavelength longer,less noise,smaller ionospheric impact of these excellent features,proposed two new tri-band GPS data Combination of the cycle of detection and repair methods: Non-geometric Phase Combining Polynomial Fitting Single-difference and Pseudo-range Phase Combination Method.(1,1,-2),(1,-2,1)are chosen for the combination of two geometric phase combinations and polynomials,Although only the use of these two combinations in the case of almost all occurrences of the occurrence of the cycle slip,but can't do the base carrier on the separation of the last week.Therefore,based on the traditional geometric phase combination method,the polynomial fitting method is used to fit the single difference between the three frequencies of GPS,and four sets of equations can be formed,and any three groups are linearly independent,this combination of the two methods can not only successfully detect the combination of weeks of jump,but also to achieve the separation of the base cycle.The experimental results show that this method is suitable for the detection and repair of the cycle under the high sampling rate data with small sampling interval,and the ideal detection effect is obtained.The downside is that this approach introduces an insensitive week jump,increasing the probability of a missed jump.In order to avoid this situation,this paper based on the combination of dual-frequency pseudo-range phase combination method,the pseudo-range phase combining method can be applied to the tripping of the tri-band data.In this paper,the optimal method of the method is used to construct the method of calculating the amount of spring test.On this basis,the corresponding optimal combination is selected for different pseudo-range noise,(0,1,-1),(-3,1,3)and(4,-8,3)under the 0.3m pseudo-range noise from the single frequency,multi frequency,insensitive week jump three aspects Carry out specific examples of experiments,the results show that the detection and separation of one week and one week can be realized by pseudo-range phase combination method,and the reliability of this method is greatly improved when the pseudo-range precision is higher.When the sampling rate of the observed data is high and the delay of the ionospheric delay between the epochs is neglected,for the different pseudo-range observation noise,the standard deviation of the standard deviation is the principle of minimum,selection of the optimal pseudo-range phase combination can correctly detect and repair all the rounds that occur in the tri-band non-difference observation data,thus avoiding the introduction of insensitive week jumps.