The Research On Cycle Slip Detection And Reparaion For Undifference Data Of GPS

In the measurement of GPS,the cycle slip directly affect the calculation of the ambiguity and the accuracy of GPS measurement,the detection and reparation of cycle slip becomes one of the most important parts in GPS phase data processing.During the GPS phase data pre-processing,it is not difficult to find that the existing detection methods of cycle slip also can eliminate it which is more than 10 cycles.However,the number of the cycle slip is smaller than 10 cycles,especially the cycle slip of 1-5 cycles,and half cycle slip and 1/4 cycle slip,it is hard to be found with general methods.On the basis of this case,the paper's main content of research work as follows:(1)When the double frequency data arise two different cycle slip at the same time,it can't be dound completely,on the basis of the mathematical model of double frequency data detecting cycle slip,puts forward the combination method with MW method,the ionosphere residual method and dual-frequency carrier pseudorange method,inferring the formula,verifying the combination method with the measured data and simulation cycle slip,the results show that the combination method can detect 1 cycles cycle slip,the method discovered feasible and good reliability.(2)In triple-frequency data detection aspects,many researchers put porward different opinions.The paper analyzes according to the triple-frequency phase combination coefficients,screening out preferable triple-frequency combinations coefficients,proposed geometry-free method combined with single differential of different frequency and triple-frequency carrier phase reduce pseudo-range,inferring the formula and do the experiments,The results show that the two kinds of methods can detect 1 cycles cycle slip,and separate base frequency carrier cycle slip,repair cycle slip effect proves better.