Beidou Navigation Satellite System Signal Cycle Slip Detection And Repair Research

With the gradual implementation of the Beidou satellite navigation system the global networking stage and the popularization of service functions,it is necessary to vigorously develop and study the related technologies.The accurate detection and repair of the cycle jump is a technical difficulty that must be resolved in the application of the Beidou technology.As a modern data processing method,wavelet analysis has achieved satisfactory results in the field of GPS cycle detection and repair.It is to be studied whether this method applies Beidou signal characteristics.Based on the systematic analysis of the characteristics of the BeiDou satellite navigation signal,this article draws lessons from the related theoretical methods of the GPS cycle jump,and uses the double difference detection amount as the cycle slip detection amount.The wavelet transform method is used in the detection and repair of the BDS cycle jump.At present,the wavelet transform method to detect the cycle slip is generally used to detect the position of the weekly jump and then combined with other methods to repair the cycle jump.This paper explores the method of using wavelet transform to detect the position of the cycle jump,and directly uses wavelet transform to repair cycle slip.Specifically,we consider the cycle slip as the first type of discontinuity in signal processing.According to the singularity detection principle of the signal,the wavelet can be used to perform multi-scale decomposition and reconstruction of the carrier phase sequence,and the trend terms in the sequence can be separated from the noise.The approximate signal(low-frequency part)and the detail signal(high-frequency part)are used to express each other.The cycle slip is highlighted in the detail signal.When a cycle slip occurs in the sequence,the wavelet-transformed coefficient has a modulus maximum value,so it is possible to accurately detect the mutated point of the signal,the epoch of the cycle slip,by analyzing the maximum point of the modulus.At the same time,it can be based on the abrupt point in the detail signal to detect the cycle jump and calculate the size.Other methods suitable for Beidou signal frequency characteristics such as high-order difference method and polynomial fitting method are summarized,the effectiveness,feasibility and applicability of the above method and the proposed wavelet transform method in the detection of the cycle jump of BDS is verified and compared through actual data and multiple simulation experiments.After several sets of simulation experiments,it can be concluded that the detection and restoration of the Beidou navigation signal cycle based on the wavelet transform method proposed in this paper is suitable for the detection and repair of the Beidou navigation signal cycle slip.It can be used in different stages of the Beidou navigation system.Solve the problems of the BeiDou navigation signal in the detection and repair of cycle slip,and provide high-quality observation data for high-precision positioning of the BeiDou satellite navigation system.The multiple simulation results of this method verify that the wavelet transform method has high accuracy and real-time performance in the detection and repair of Beidou navigation signal cycle hops.It can detect the exact position of the cycle hop,and the repair effect is good.Compared with other methods,it can still maintain good detection and repair effects at low sampling rates,especially in the case of cycle slip detection,which has unparalleled advantages of other methods,whether it is a large cycle jump,a small cycle jump,multiple consecutive weeks Jumps can be effectively detected,and can be used in the application of Beidou navigation system.At the same time,it is of great significance to promote the promotion and popularization of Beidou.