Receiver quick positioning method based on strong tracking filtering and Hermite interpolation method

Abstract

The invention discloses a receiver quick positioning method based on strong tracking filtering and a Hermite interpolation method. According to the receiver quick positioning method, based on a known satellite running state, the position of a satellite can be predicted in an interpolation manner, so that the computation complexity is greatly reduced while the positioning precision is ensured; by utilizing a strong tracking filtering device, the quick positioning of a receiver is realized. Specifically the receiver quick positioning method comprises the following steps of firstly extracting ephemeris parameters in a navigation message, and computing the position and the speed of the satellite according to an air interface document; secondly selecting a time interval of a sliding window, and estimating the position of the satellite orbit according to the Hermite interpolation method; finally adjusting a system state vector and a noise covariance matrix. According to the receiver quick positioning method based on the strong tracking filtering and the Hermite interpolation method, which is disclosed by the invention, the positioning resolution of the receiver is carried out by utilizing the strong tracking filtering; meanwhile, the time interval of the sliding window is adjusted, and the prediction and the filtering on the orbit are carried out repeatedly, so that the quick positioning of the receiver is realized; on the premise of ensuring the positioning precision, the computation complexity is greatly reduced, and the requirements of a user on the positioning precision, the real time performance and the robustness of the receiver can be met.

Description

technical field [0001] The invention belongs to the field of positioning calculation of a global satellite navigation system receiver, in particular to a fast receiver positioning method based on nonlinear filtering and interpolation methods. Background technique [0002] At present, the Global Navigation Satellite System (GNSS) mainly includes the GPS of the United States, GLONASS of Russia, Galileo of Europe and BDS of China. GNSS plays an extremely important role in both military and civilian fields, especially in military use, it can improve the target hit rate of missiles; in the civilian field, GNSS can locate and navigate objects at all levels of sea, land and air , including ocean-going navigation of ships and water diversion into ports, autonomous navigation of automobiles, route guidance and approach and landing of aircraft, etc. In addition, the core technology of various ground vehicle tracking and urban intelligent traffic management is GNSS positioning; it can...

AI Technical Summary

Problems solved by technology

[0006] The orbit of the satellite is about 20200Km away from the earth's surface. The accurate calculation of the satellite space position is closely related to the correct positioning of the receiver. The traditional method to obtain the satellite space position coordinates is the ephemeris parameters broadcast by the satellite navigation message, which includes 6 Kepler orbit parameters , 9 perturbation correction parameters, after a series of complex calculations, including solving overdetermined equations, iterative convergence, inverse trigonometric functions, etc., the precise spatial position coordinates of the satellite are calculated, but at the same time, a large computational complexity is required

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