Research On Carrier Phase Differential Location Algorithm In Seismic Data Acquisition Station

Carrier phase differential positioning algorithm is a commonly used positioning method for seismic data acquisition stations.Carrier phase differential positioning algorithm also has some problems,such as long positioning time and complex algorithm.Therefore,the research on carrier phase differential positioning algorithm is beneficial to improve positioning accuracy and positioning efficiency of seismic data acquisition stations.To provide theoretical support for carrier phase differential positioning algorithm,the principle of GPS satellite signal,system composition,navigation message and the characteristics of C/A code and P code are analyzed.The principle and mathematical model of carrier phase differential positioning for seismic data acquisition station are discussed,and the methods of positioning error and eliminating error are summarized.Cycle slip and integer ambiguity are the core problems of carrier phase differential location algorithm.In view of the problem of cycle slip detection,the commonly used methods of cycle slip detection are compared and analyzed.A method combining polynomial fitting method and wavelet transform method is proposed to detect and repair cycle slip effectively.Aiming at the problem of integer ambiguity,the law of integer ambiguity traversing search space is analyzed,and the method of searching domain traversing law is proposed.An example is introduced to show that the algorithm can predict the optimal solution of integer ambiguity.Then an adaptive differential evolution algorithm is proposed to solve the ambiguity.The experiment shows that the adaptive differential evolution algorithm can converge to the global optimal solution faster than LAMBDA algorithm,and improve positioning efficiency.Based on the analysis of carrier phase differential positioning algorithm flow and GPS ephemeris resolution technology,the observation data,ephemeris data and satellite position data of seismic data acquisition station are obtained by simulation experiment of carrier phase differential positioning.The practical effect of adaptive differential evolution algorithm and LAMBDA algorithm in solving integer ambiguity is compared,and the positioning accuracy of carrier phase differential positioning algorithm is obtained.The conclusion in the centimeter range proves that the carrier phase differential location algorithm can satisfy the needs of seismic exploration in positioning accuracy.