An Investigation On The Carrier Phase Cycle-slip Rejection Of Satellite Navigation Receiver

With the development of global navigation and positioning system,the demand for the precision of navigation is becoming higher and higher.However,if the carrier phase jumped,it will reduce the carrier phase measurement accuracy.In order to explore the mechanism of carrier phase cycle-slips and reduce the probability of occurrence of a phase cycle slip of the receiver,this paper studied from four aspects:(1)An introduction to the principle of carrier phase positioning,gives the definition of carrier phase cycle slip.Given three common carrier tracking models and export its loop noise bandwidth of expression.In the case of a second order phase-locked loop,used loop differential equation to explain the inner reason of phase cycle slip.Finally,several common measures of loop performance of the slip frequency have been given.(2)Extended the analysis of the traditional pure phase-locked loop phase jump model to the Costas loop and derive the loop phase error probability density function.According to the theory of Markov chain of random walk,the mean time of cycle slips of first order,second order and third order was deduced based on the two quadrant arctangent of Costas loop discriminator the theoretical formula is solved by numerical analysis,and combined with the Monte Carlo simulation to argue.(3)Proposed a method to parameters optimized of phase-locked loop,and enhanced the inhibition ability of phase cycle slip.In the cases of Doppler rate of 0 Hz/s and 2.5 Hz/s,analyzed the influence of loop parameters to the mean time of cycle slips of the second order and third order phase-locked loop,and compared the ability to cycle slip suppression of different parameter combination.In addition,this paper analyzes the difference impact of phase jitter variance and the mean time of cycle slip of second-order phase-locked loop parameters.(4)Proposed a method based on the limitation of phase error and accumulated phase error to suppress the loop phase slip.Simulation results show that if you do not consider the loop dynamics,this method can make the probability of the loop cycle slips fell 67%.If the signal Doppler frequency is constant,this method can make the probability of the loop cycle slips fell 38%.However,in the case of the Doppler frequency change rate is not equal to zero,the probability of the occurrence of cycle slips a loop is unchanged.