Navigation multipath effect inhibition method based on space-time big data

Abstract

The invention relates to a navigation multipath effect inhibition method based on space-time big data; the method comprises the following steps: creating a space-time big data multipath information table, using time and coordinates solved by an original input signal as a two dimension index, and using the corresponding navigation position coordinate offset amount as contents; 2, sharing the space-time big data multipath information table to other navigation receiver users in the table creation area in the step1; 3, loading the space-time big data multipath information table to the local database; 4, searching the space-time big data multipath information table in the local database when the navigation coordinates received by other navigation receiver users have hopping, retrieving the corresponding navigation position coordinate offset amount and correcting same, thus obtaining a positioning result. The method can inhibit the multipath effect according to the sharing ideas, and can reduce the multipath inhibition algorithmic complexity in the navigation digit intermediate frequency signals.

Description

technical field [0001] The invention relates to a navigation multipath effect suppression method based on spatiotemporal big data, which belongs to the technical field of satellite navigation. Background technique [0002] Satellite navigation has the characteristics of all-weather, continuity and real-time, and can provide users with services such as positioning, speed measurement and timing. It has been widely used in various fields, and the scope of application is still expanding. [0003] The positioning accuracy of the satellite navigation receiver will be affected by various factors, resulting in a certain deviation between the positioning result and the actual position. In the environment of high-rise buildings in the city, multipath interference is one of the main sources of error, and this error will change with time and the position of the receiver, and it is difficult to eliminate it accurately from the positioning algorithm. Due to the existence of multipath sig...

AI Technical Summary

Problems solved by technology

This type of method is simple to implement, but the multipath suppression performance usually cannot meet the high-precision positioning requirements; another type of method is to estimate the parameters of each multipath signal component, and subtract these multipath signal components from the total received signal. To restore the direct wave signal, such as multipath estimation delay locked loop (MEDLL), Vision correlator and other technologies, these technologies can effectively reduce the multipath effect of the code phase and carrier phase measurements

However, the implementation of the optimal estimation method for solving multipath signal parameters is relatively complicated, which significantly increases the calculation amount of the decoding algorithm, and is limited in low-power applications.

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