Research On Improvement Of Positioning Algorithm Of Beidou Satellite Navigation Landing System

GBAS Landing System is a landing system based on the land-based augmentation system(GBAS)and is a new type of system that will replace the instrument landing system(ILS)in the future.The BeiDou satellite navigation landing system will now become a national strategic emerging industry with broad application prospects.Realizing accurate positioning is of great significance to the promotion of BeiDou satellite navigation system.This paper focuses on the positioning algorithm of BeiDou satellite navigation and landing system,and discusses the detection and repair of cycle slip,which is the most influential in the precise positioning of the carrier phase of the landing system,and the problem of calculating the ambiguity of whole cycles?Using the actual measurement data as a benchmark,study the detection and repair problems described above,and verify the respective capabilities of the two when the sampling rate is inconsistent.Once the sampling rate enters a relatively low stage,there will be The problem of ionospheric delay errors often leads to the inability to achieve accurate detection targets using common methods.For the repair problem,the method of combining with and without ionosphere was created in this design to obtain detailed values.At the same time,the actual measured data was fully used to verify the method.After the verification was completed,it was found to be accurate Compared with the more traditional methods in the past,the various combinations at the half-minute sampling rate are detected,and the applicability is more outstanding.In the process of using the carrier phase measurement value to solve it,it has analyzed the principle of the LAMBDA algorithm to solve,and formulated an improved LLL algorithm,which makes the processing effect more excellent.Processing of high-dimensional integer ambiguity covariance matrix.In order to improve the efficiency of the calculation to a higher level,in this design,Developed a quick settlement method based on the adaptive genetic algorithm as the basis,and introduced this genetic algorithm to search for ambiguity.After performing the simulation operation,it can be found that the search efficiency has a higheradvantage compared with the previous LAMBDA.