Satellite positioning enhancing method based on receiver clock offset generalized prolongation approach method

Abstract

The invention discloses a satellite positioning enhancing method based on a receiver clock offset generalized prolongation approach method. According to the method, a generalized prolongation approach mathematic model and a high-accuracy and high-sensitivity receiver clock offset extrapolation model are combined, a receiver clock offset is predicted and extrapolated to obtain a clock offset value of a receiver when satellite signals are blocked, and therefore three-dimensional positioning can still be achieved in an assisted mode on the condition of incomplete positioning; the generalized prolongation approach mathematic model is adopted to establish a high-accuracy clock offset calculation mathematic model, and a new constraint positioning enhancing method is established with the calculated clock offset as a constraint condition; the generalized prolongation clock offset approach model has both the advantages of an interpolation method and the advantages of a fitting method and can lock latest observation data, so that the clock offset model better conforms to the real-time change characteristics and law, and higher fitting and extrapolation accuracy is obtained. The satellite positioning enhancing method has high practical value and practical significance.

Description

technical field [0001] The invention relates to a satellite positioning enhancement method based on a receiver clock error generalized continuation and approximation method, and belongs to the field of satellite positioning and navigation. Background technique [0002] At present, in environments with many obstacles such as cities, canyons, and forests, the existing satellite positioning system is prone to incomplete positioning conditions where the number of visible satellites is less than 4. If you do not rely on other auxiliary means or information , the user will not be able to complete normal positioning. It still takes some time after the incomplete condition ends to reacquire and lock on to satellite signals for positioning. This situation affects the continuity and availability of satellite positioning, and has become one of the technical bottlenecks in the application of GPS and other satellite systems in occluded environments. To solve this problem, integrated ine...

AI Technical Summary

Problems solved by technology

The low-order interpolation or fitting classical models generally used in the prior art are often too simple and have poor accuracy; while the high-order models increase the amount of calculations, they are likely to cause the Runge effect, or need to be calculated in advance based on prior data. Empirical modeling, so there are limitations in practical application

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