Rapidly convergent precise point positioning method

Abstract

The invention discloses a rapidly convergent precise point positioning method. First preprocessing is performed on observation data of global navigation satellites, then in combination with an observation equation of an original carrier phase observed value, an observation equation of a code phase half combination observed value and an observation equation of a geometry-free combination observed value, an improved observation equation of precise point positioning is built, and Kalman filtering is adopted to estimate parameters in the improved observation equation of precise point positioning, receiver location information and tropospheric delay and ionospheric delay information are obtained, thereby realizing GNSS rapid point precise positioning. Compared with the prior art, the rapidly convergent precise point positioning method provided by the invention can better reduce influence of observation noise and orbit errors on a filtering convergence rate and positioning precision, and uses a characteristic of a slow change between tropospheric delay and ionospheric delay epochs as constraint condition, thereby improving performance of precise point positioning calculation.

Description

technical field [0001] The invention relates to the technical field of global navigation satellite positioning, in particular to a fast-converging precise single-point positioning method. Background technique [0002] Precise Point Positioning (PPP for short) is a high-precision positioning method based on correction information in the state space domain. The basic implementation method is: the user uses a GNSS (Global Navigation Satellite System) receiver's dual-frequency code pseudo-range and carrier phase observations, Through the GNSS precise orbit and precise clock difference products provided by the International GNSS Service Organization (InternationalGNSSService, referred to as IGS), the satellite orbit and clock difference information at the corresponding observation time is interpolated, and the error model is used to correct the antenna phase center, the earth's rotation, solid tides, etc. Influenced by error sources, single-station absolute positioning is carried...

AI Technical Summary

Problems solved by technology

These two methods both use the ionospheric depletion combination, although the influence of the ionospheric delay on the positioning is reduced, but the observation noise and multipath effect are amplified, which is not conducive to the rapid convergence of the position solution; In the fifth issue of volume 39, the Un-Combined method (UC method for short) was proposed. This method uses the form of parameter estimation to simulate the ionospheric delay as a random walk, but uses the original code pseudo-range observation value, observation noise Still large, and cannot reduce the impac

Images